CN116292070A - Blade and wind generating set - Google Patents

Abstract

The application relates to a blade and wind generating set, the blade includes the blade body, lightning protection subassembly and discharge the subassembly, the blade body is including the shell that has the inner chamber, the regional first conductive path that is formed with of at least part of shell, lightning protection subassembly sets up in the blade body and is formed with the second conductive path that is used for transmitting the thunder current, the second conductive path sets up with first conductive path is parallel, discharge the subassembly and be connected with at least one of shell and lightning protection subassembly, in order to form the discharge gap between first conductive path and second conductive path, the breakdown voltage of discharge gap is less than the breakdown voltage of shell. The blade in this application embodiment can prevent to break down the shell in, has reduced the electric current quantity of conduction to the blade body, guarantees the safe operation of blade.

Description

Blades and wind turbines

technical field

The present application relates to the technical field of wind power, in particular to a blade and a wind power generating set.

Background technique

Blades in wind power generators are vulnerable to lightning strikes. Existing blades are often provided with lightning protection components, and the discharge of the blades is realized by grounding the lightning protection components.

The shell of the blade is provided with conductive fibers. When the lightning current is conducted on the lightning protection component, a current will be induced on the conductive fibers of the blade, and a conductive path will be formed on the conductive fibers. When the potential difference between the conductive path of the conductive fiber and the conductive path of the lightning protection component is large, it is easy to cause electrical breakdown between the conductive path of the conductive fiber and the conductive path of the lightning protection component, resulting in damage to the shell and reducing the The strength of the blade affects the safe operation of the blade.

Contents of the invention

The embodiments of the present application provide a blade and a wind power generating set, which can reduce the amount of current conducted to the blade body while preventing the breakdown of the shell, and ensure the safe operation of the blade.

On the one hand, according to an embodiment of the present application, a blade is proposed, including: a blade body, including a shell with an inner cavity, at least a partial area of the shell is formed with a first conductive path; a lightning protection component is arranged on the blade body and formed for A second conductive path for transmitting lightning current, the second conductive path is arranged in parallel with the first conductive path; the discharge component is connected to at least one of the casing and the lightning protection component, so as to be between the first conductive path and the second conductive path A discharge gap is formed, and the breakdown voltage of the discharge gap is lower than the breakdown voltage of the shell.

According to an aspect of the embodiment of the present application, the lightning protection assembly is extended along the length direction of the blade body, the number of the discharge assembly is one, the blade body has a blade tip section and a blade root section along the length direction, and the discharge assembly is arranged on the blade tip section or blade root section; or, the number of discharge assemblies is more than two, and more than two discharge assemblies are arranged at intervals along the length direction between the casing and the lightning protection assembly.

According to an aspect of the embodiment of the present application, the lightning protection component includes at least one of a conductive grid and a downconductor; the discharge component includes a first discharge module and/or a second discharge module, and the first discharge module is used for the conductive grid and the casing A discharge gap is formed between them, and the second discharge module is used to form a discharge gap between the downconductor and the shell.

According to an aspect of the embodiment of the present application, in the length direction, the conductive mesh and the downconductor are arranged in contact with each other.

According to an aspect of the embodiment of the present application, in the length direction, the conductive grid and the downconductor are at least partially overlapped; in the overlapping area of the conductive grid and the downconductor, at least part of the first discharge module and the second discharge module are in the Dislocation setting in the length direction.

According to an aspect of the embodiments of the present application, in the length direction, the breakdown voltages of the discharge gaps formed by at least two discharge assemblies are different.

According to an aspect of the embodiment of the present application, the discharge assembly includes a first discharge portion, one end of the first discharge portion is connected to one of the blade body and the lightning protection assembly, and the other end extends toward the other of the blade body and the lightning protection assembly Set and form a discharge gap with the other.

According to an aspect of the embodiment of the present application, the discharge assembly includes a second discharge part and a third discharge part, one end of the second discharge part and the third discharge part are respectively connected to the blade body and the lightning protection assembly, and the second discharge part and the third discharge part are connected to each other. The other ends of the three discharge parts are oppositely arranged to form a discharge gap.

According to an aspect of the embodiment of the present application, the discharge assembly further includes a fourth discharge part, the fourth discharge part is connected to the blade body and at least partially extends into the discharge gap, so as to separate the discharge gap to form a first sub-gap and a second sub-gap .

According to an aspect of the embodiment of the present application, the end portion of the discharge assembly for forming the discharge gap is configured as at least one of a columnar structure, a needle-shaped structure, a spherical structure, and a plate-shaped structure.

According to an aspect of the embodiment of the present application, the discharge gap is filled with a dielectric, and the dielectric is set to be air; or, the blade further includes a container, the container is at least partially sleeved on the outer periphery of the discharge assembly and covers the discharge gap, and the dielectric is filled in the container Inside, the dielectric is set to be at least one of water, insulating oil and zinc oxide.

According to an aspect of the embodiment of the present application, the blade body further includes a web, the web is disposed in the inner cavity and connected to the casing, and the receiving member and the discharge assembly are at least partially connected to the web.

In another aspect, an embodiment of the present application provides a wind power generating set, including the blade in the above embodiment.

The blade provided by the embodiment of the present application includes a blade body, a lightning protection component, and a discharge component connected to at least one of the blade body and the lightning protection component. At least a part of the outer shell of the blade body is formed with a first conductive path, and the lightning protection The component is formed with a second conductive path for transmitting lightning current, and the first conductive path and the second conductive path are arranged in parallel. Wherein, the discharge component forms a discharge gap between the first conductive path and the second conductive path, and the breakdown voltage of the discharge gap is lower than the breakdown voltage of the casing, so that when the lightning current is conducted on the second conductive path, If the potential difference between the first conductive path and the second conductive path is large, the lightning current can be guided to discharge from the position of the discharge gap, thereby avoiding breakdown of the shell and ensuring the safety of the blade. At the same time, after the discharge through the discharge gap, the potential difference between the first conductive path and the second conductive path gradually becomes smaller. When the potential difference is smaller than the breakdown voltage of the discharge gap, the first conductive path and the second conductive path are disconnected. Open, that is, no lightning current will be conducted to the blade body, thereby reducing the amount of current conducted to the blade body, and further ensuring the safe operation of the blade.

Description of drawings

The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of a blade provided by an embodiment of the present application;

Fig. 2 is a cross-sectional view of a blade provided by an embodiment of the present application;

Fig. 3 is a schematic diagram of the arrangement of discharge components provided by an embodiment of the present application;

Fig. 4 is a cross-sectional view of a blade provided by another embodiment of the present application;

Fig. 5 is a schematic diagram of the arrangement of discharge components provided by another embodiment of the present application;

Fig. 6 is a cross-sectional view of a blade provided by another embodiment of the present application;

Fig. 7 is a cross-sectional view of a blade provided by another embodiment of the present application;

Fig. 8 is a cross-sectional view of a blade provided by another embodiment of the present application;

Fig. 9 is a cross-sectional view of a blade provided by another embodiment of the present application;

Fig. 10 is a cross-sectional view of a blade provided by another embodiment of the present application;

Fig. 11 is a cross-sectional view of a blade provided by another embodiment of the present application;

Fig. 12 is a cross-sectional view of a blade provided by another embodiment of the present application;

Fig. 13 is a schematic structural diagram of a wind power generating set provided by an embodiment of the present application.

in:

100-blade; 200-cabin; 300-tower;

1-blade body; 11-shell; 12-support; 2-lightning protection component; 21-conductive grid; 22-down conductor; 23-receiver; 3-discharge component; 31-first discharge part; 32- The second discharge part; 33-the third discharge part; 34-the fourth discharge part; 4-accommodating part;

S1-the first discharge module; S2-the second discharge module;

X-length direction.

In the figures, the same parts are given the same reference numerals. The figures are not drawn to scale.

Detailed ways

Features and exemplary embodiments of various aspects of the present application will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application. In the drawings and the following description, at least some well-known structures and techniques have not been shown in order to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of some structures may have been exaggerated. Furthermore, the features, structures, or characteristics described hereinafter may be combined in any suitable manner in one or more embodiments.

The orientation words appearing in the following description are the directions shown in the figure, and are not intended to limit the specific structure of the blade and the wind power generating set of the present application. In the description of this application, it should also be noted that unless otherwise specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or Connected integrally; either directly or indirectly. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

Considering that blades are easily struck by lightning, existing blades are often provided with lightning protection components, which are formed with conductive paths and grounded to transmit lightning current and discharge the blades. However, for the existing structure of the blade, as the length of the blade gradually increases, the shell of the blade is often combined with different types of fibers, such as glass fiber and carbon fiber, to meet the requirements for strength and weight reduction of the blade. Since carbon fiber is a conductive fiber, when the lightning current is conducted on the conductive path of the lightning protection component, a current will be induced on the carbon fiber of the casing and a conductive path will be formed on the casing.

At the same section of the blade, there is a potential difference between the conductive path on the shell and the conductive path of the lightning protection component. When the potential difference is large, it is easy to have an electrical breakdown between the conductive paths of the two, resulting in the damage of the blade. The glass fiber is damaged, which reduces the strength of the blade and affects the safe operation of the blade.

Therefore, the existing blades often directly connect the conductive path of the casing and the conductive path of the lightning protection component, so that the electric potential of the conductive path of the casing and the conductive path of the lightning protection component are the same, so as to eliminate the potential difference between the two. However, the inventor found through careful research that since carbon fiber is a conductive fiber, when the conductive path of the shell and the conductive path of the lightning protection component are directly connected, the lightning current of the lightning protection system will be directly conducted to the shell, causing the conduction of the blade body. Larger lightning current. At the same time, considering the actual structure of the blade, it is not possible to connect the shell and the lightning protection component along the length direction of the entire blade, because the size of the carbon fiber in each area of the length direction of the blade is different, that is, at different cross-sections of the blade, the carbon fiber has different Therefore, there may still be a potential difference in the non-connected area between the carbon fiber and the lightning protection component, which will cause the glass fiber on the shell between the two to be broken down and reduce the blade strength.

In order to solve the above technical problems, this application proposes a blade. By constructing a discharge gap between the conductive path of the casing and the conductive path of the lightning protection component, the discharge gap can be broken down under a certain potential difference to form an electric current. The connecting channels can eliminate or reduce the potential difference, and can reduce the amount of current transmitted to the blade body while protecting other parts of the blade body from breakdown under the potential difference. In order to better understand the present application, the blade and the wind power generating set according to the present application will be described in detail below with reference to FIGS. 1 to 13 .

Please refer to Fig. 1 and Fig. 2, the embodiment of the present application discloses a blade 100, including a blade body 1, a lightning protection assembly 2 and a discharge assembly 3, the blade body 1 includes a casing 11 with an inner cavity, at least a part of the casing 11 A first conductive path is formed. The lightning protection component 2 is arranged on the blade body 1 and forms a second conductive path for transmitting lightning current. The second conductive path is arranged in parallel with the first conductive path. The discharge component 3 and the casing 11 and the lightning protection At least one of the components 2 is connected to form a discharge gap between the first conductive path and the second conductive path, the breakdown voltage of the discharge gap being smaller than the breakdown voltage of the housing 11 .

In the blade 100 of the embodiment of the present application, a discharge gap is formed between the first conductive path and the second conductive path through the discharge component 3, and the breakdown voltage of the discharge gap is smaller than the breakdown voltage of the casing 11, so that when the lightning current During the conduction process on the two conductive paths, if the potential difference between the first conductive path and the second conductive path is small, that is, under a small lightning current, no breakdown will occur, and if the first conductive path and the second conductive path When the potential difference between the paths is large, the lightning current can be guided to discharge from the position of the discharge gap, thereby avoiding breakdown of the shell 11 and ensuring the safety of the blade 100 . At the same time, after the discharge through the discharge gap, the potential difference between the first conductive path and the second conductive path gradually becomes smaller. When the potential difference is smaller than the breakdown voltage of the discharge gap, the first conductive path and the second conductive path The arc is broken, that is, the lightning current will no longer be conducted to the blade body 1 by the lightning protection component, thereby reducing the amount of current conducted to the blade body 1 and further ensuring the safe operation of the blade 100 .

It can be understood that the first conductive path of the shell 11 can be formed by carbon fiber, or can be formed by other conductive materials on the shell 11 . Since the shell 11 is also provided with glass fibers, in order to avoid damage to the glass fibers of the blade 100 casing, the breakdown voltage of the discharge gap can be lower than that of the glass fibers between the first conductive path and the second conductive path. The breakdown voltage, so that when the potential difference between the first conductive path and the second conductive path is greater than the breakdown voltage, the discharge can be broken down from the discharge gap without damaging the glass fiber of the casing 11, so as to ensure the blade 100 safety.

Please refer to Figures 1 to 3, in some optional embodiments, the lightning protection assembly 2 is extended along the length direction X of the blade body 1, the number of the discharge assembly 3 is one, and the blade body 1 has a blade tip along the length direction X The discharge assembly 3 is arranged at the tip section or the root section to guide the discharge of the lightning current at the tip section or the root section.

In other optional embodiments, the number of discharge assemblies 3 is more than two, and more than two discharge assemblies 3 are arranged at intervals along the length direction X between the casing 11 and the lightning protection assembly 2, so that the first conductive A plurality of discharge gaps are formed between the path and the second conductive path, so as to better guide the lightning current to discharge from the discharge gaps.

Optionally, along the length direction X of the blade body 1, more than two discharge assemblies 3 can be arranged at equal intervals or at variable intervals, that is, the distance between two adjacent discharge assemblies 3 can be adjusted according to the specific size of the blade body 1. The structure is adjusted, which is not specifically limited in this application.

In some optional embodiments, the lightning protection component 2 includes at least one of a conductive grid 21 and a downconductor 22, the discharge component 3 includes a first discharge module S1 and/or a second discharge module S2, and the first discharge module S1 is used to form a discharge gap between the conductive grid 21 and the casing 11 , and the second discharge module S2 is used to form a discharge gap between the down conductor 22 and the casing 11 .

In an optional embodiment, the lightning protection component 2 only includes a conductive mesh 21, the conductive mesh 21 can be arranged on the outer surface of the shell 11 away from the inner cavity and form the first sub-path of the second conductive path, and the conductive mesh 21 can be Extend along the length direction X to the root section of the blade to ensure the lightning protection effect of the blade body 1 . At this time, the discharge assembly 3 only includes the first discharge module S1, the first discharge module S1 is at least partly located between the conductive grid 21 and the casing 11, and forms a discharge gap between the first conductive path and the first sub-path to eliminate Or reduce the potential difference.

In another optional implementation, the lightning protection component 2 only includes the downconductor 22, and the downconductor 22 can be arranged in the inner cavity and form the second sub-path of the second conductive path. At this time, the discharge component 3 only includes The second discharge module S2 is at least partly located between the downconductor 22 and the casing 11 , and forms a discharge gap between the first conductive path and the second sub-path to eliminate or reduce the potential difference.

In yet another optional implementation, the lightning protection component 2 includes a conductive mesh 21 disposed on the outer surface of the housing 11 away from the inner cavity and a downconductor 22 disposed in the inner cavity, that is, formed on the inner and outer sides of the outer housing 11 at the same time. There are a first sub-path and a second sub-path. At this time, the discharge assembly 3 includes a first discharge module S1 and a second discharge module S2 at the same time, and between the first conductive path and the first sub-path, and the first conductive path A discharge gap is formed between the second sub-path and the second sub-path to further ensure the safe operation of the blade.

Optionally, the conductive mesh 21 can also be configured as strips or belts, or as conductive threads woven into a fabric. In addition, the lightning protection component 2 can also include a receiver 23, the receiver 23 is arranged on the outer surface of the shell 11 away from the inner cavity, the conductive grid 21 is connected to the receiver 23, so that the lightning current captured by the receiver 23 passes through the conductive grid 21 lead to the earth.

When the lightning protection component 2 includes both the conductive grid 21 and the downconductor 22, in some optional embodiments, in the length direction X, the conductive grid 21 and the downconductor 22 are arranged in contact. That is, in the longitudinal direction X, the first discharge module S1 and the second discharge module S2 are set separately, and there is no overlap between them, so the positions of the first discharge module S1 and the second discharge module S2 can be adjusted respectively at this time to realize discharge adjustment.

In other optional embodiments, the conductive mesh 21 and the downconductor 22 are extended along the length direction X of the blade body 1 , and in the length direction X, the conductive mesh 21 and the downconductor 22 are at least partially overlapped. The number of the first discharge module S1 and the second discharge module S2 is more than two, and in the overlapping area between the conductive grid 21 and the downconductor 22, at least part of the first discharge module S1 and the second discharge module S2 are in the length direction X Misplaced settings. That is, the first conductive path, the first sub-path and the second sub-path are formed at the overlapping area of the conductive network 21 and the downconductor 22, so the first discharge module S1 and the second discharge module S1 in the overlapping area can be adjusted. The arrangement position of the module S2 guides the lightning current to break through the discharge gap at a predetermined position and transmit it to another conductive path, so as to adjust the transmission mode of the lightning current along the length direction X to better realize the discharge of the blade 100 .

Please refer to FIG. 4 and FIG. 5. It should be noted that the casing 11 also includes a pressure surface and a suction surface oppositely arranged, and the pressure surface and the suction surface can respectively form a first conductive path, and at the same time, the conductive mesh 21 can be respectively arranged on the casing 11 on the pressure surface and the suction surface, at this time, two first sub-paths, two first conductive paths and one second sub-path can be formed in the cross-section of the blade 100, that is, five The conductive paths X are arranged in parallel, at this time, the positions of the first discharge modules S1 and the second discharge modules S2 can be further adjusted to guide the transmission of lightning current between the conductive paths, so as to ensure the discharge effect of the blade 100 .

In some optional embodiments, in the length direction X, the breakdown voltages of the discharge gaps formed by at least two discharge components 3 are different. Since in the longitudinal direction X, the structure of each area of the shell 11 is different, such as the thickness of the conductive fiber, the thickness of the glass fiber, and the distance between the metal mesh and the shell 11, there is a difference, so the discharge gap of each discharge assembly 3 can be adjusted. The breakdown voltage is better adapted to the structure of the various regions of the housing 11 .

It can be understood that since the first discharge module S1 and the second discharge module S2 are respectively arranged between the conductive grid 21 and the casing 11 and between the casing 11 and the downconductor 22, in addition to making at least two discharge modules S2 in the length direction X In addition to the breakdown voltages of the discharge gaps of the first discharge module S1 and/or at least two second discharge modules S2 being different, the breakdown voltages of the discharge gaps between the first discharge module S1 and the second discharge module S2 can also be different , and its specific range can be adjusted according to the specific structure of the blade body 1, which is not specifically limited in this application.

Wherein, in order to adjust the breakdown voltage of the discharge gap formed by the discharge assembly 3, the size of the discharge gap can be adjusted on the one hand, and the dielectric material filled in the discharge gap can be adjusted on the other hand to further adjust the breakdown voltage of the discharge gap .

Please refer to FIG. 2 and FIG. 6 , in some optional embodiments, the discharge gap is filled with a dielectric, and the dielectric is air. Alternatively, the blade 100 further includes a housing part 4, the housing part 4 is at least partly sheathed on the outer periphery of the discharge assembly 3 and covers the discharge gap, the dielectric is filled in the housing part 4, and the dielectric is at least one of water, insulating oil and zinc oxide. By.

When the dielectric is set to air, air can be used to have the characteristic of self-recovery. After a discharge, the discharge gap can be refilled with air, and the breakdown voltage of the discharge gap will not change, which makes it easier to install the discharge assembly 3 . When the dielectric medium is set as a liquid medium or solid powder, a container 4 can be additionally provided, and the discharge assembly 3 can extend into the container 4 and form a discharge gap in the container 4, by filling the dielectric in the container 4, by The discharge gaps of at least two discharge components 3 are filled with different dielectrics, so that the breakdown voltage of the discharge gaps of the discharge components 3 can be adjusted.

It can be understood that, in addition to zinc oxide, other materials with nonlinear volt-ampere characteristics can also be used, which can use the nonlinear characteristics to play the role of leakage and breaking.

In some optional embodiments, the blade body 1 further includes a support 12, the support 12 is disposed in the inner cavity and connected to the outer casing 11, and the receiving part 4 and/or the discharge assembly 3 are at least partially connected to the support 12, so that It is more convenient to fix the discharge assembly 3 and the receiving part 4 . For example, the support member 12 can utilize the web in the blade body 1, and the discharge assembly 3 can be set as a wire, and the wire can at least partially extend to the web and fix the position of the wire through the web, when the blade 100 also includes a receiving part 4, the receiving part 4 can also be fixed on the web, and the wire part is arranged in the receiving part 4, so that the arrangement of the discharge assembly 3 is more convenient.

Optionally, in some other embodiments, the accommodating part 4 may also be fixed on the surface of the housing 11 facing the inner cavity, that is, it only needs to be able to support the accommodating part 4 and the discharge assembly 3 .

It can be understood that when the lightning protection component 2 includes the conductive mesh 21 and the downconductor 22 electrically connected to the conductive mesh 21, since the downconductor 22 is arranged in the inner cavity, the downconductor 22 can also be fixed on the abdominal cavity. board 12, so as to facilitate the extended arrangement of the first discharge module S1. Since the conductive grid 21 is arranged on the outer surface of the housing 11 away from the inner cavity, the second discharge module S2 can be arranged between the conductive grid 21 and the housing 11, and a connecting wire electrically connected to the conductive grid 21 can also be provided. The wires extend to the inner cavity and are fixed on the web 12 to facilitate the extension of the second discharge module S2.

For ease of description, the first discharge module S1 is taken as an example below to illustrate how to form a discharge gap between the blade body 1 and the lightning protection assembly 2 through the discharge assembly 3 .

Referring to FIG. 7, in some optional embodiments, the discharge assembly 3 includes a first discharge portion 31, one end of the first discharge portion 31 is connected to one of the blade body 1 and the lightning protection assembly 2, and the other end faces the blade. The other of the main body 1 and the lightning protection component 2 is extended and forms a discharge gap with the other. That is, the discharge assembly 3 may only include the first discharge portion 31 , and the end of the first discharge portion 31 is spaced from one of the blade body 1 and the lightning protection assembly 2 to form a discharge gap.

Please refer to FIG. 8 , in some optional embodiments, the discharge assembly 3 includes a second discharge part 32 and a third discharge part 33 , and one end of the second discharge part 32 and the third discharge part 33 are respectively connected to the blade body 1 and the anti- The lightning components 2 are connected, and the other ends of the second discharge portion 32 and the third discharge portion 33 are disposed opposite to form a discharge gap. That is, the discharge assembly 3 may include a second discharge portion 32 and a third discharge portion 33 , and the ends of the second discharge portion 32 and the third discharge portion 33 are spaced apart to form a discharge gap.

Please refer to FIG. 9, in some optional embodiments, the discharge assembly 3 further includes a fourth discharge portion 34, the fourth discharge portion 34 is connected to the blade body 1 and at least partially extends into the discharge gap, so as to separate and form the discharge gap. a first sub-gap and a second sub-gap. Specifically, when the discharge assembly 3 includes the first discharge portion 31, the fourth discharge portion 34 may be disposed in the discharge gap formed by the first discharge portion 31 being spaced apart from one of the blade body 1 and the lightning protection assembly 2, When the discharge assembly 3 includes the second discharge portion 32 and the third discharge portion 33 , the fourth discharge portion 34 may also be disposed in the discharge gap formed by the second discharge portion 32 and the third discharge portion 33 . By disposing the fourth discharge portion 34 in the discharge gap, the size of the discharge gap can be further adjusted, so as to further adjust the breakdown voltage of the discharge assembly 3 .

Please refer to Figure 8, Figure 10 to Figure 12, in some optional embodiments, the end of the discharge assembly 3 used to form the discharge gap is set to at least one of a columnar structure, a needle-shaped structure, a spherical structure and a plate-shaped structure By. That is, it is only necessary for the discharge assembly 3 to ensure the formation of a discharge gap between the first conductive path and the second conductive path, and the end structure of its conductive part can be adjusted according to the specific structure of the blade 100 .

Please refer to FIG. 13 , the embodiment of the present application also provides a wind power generating set, including the blade 100 in the above embodiment. The wind power generating set also includes a nacelle 200 and a tower 300 , the nacelle 200 is arranged on the top of the tower 300 , and the lightning protection component 2 of the blade 100 is electrically connected to the ground through the nacelle 200 and the tower 300 .

Because the wind power generator set in the embodiment of the present application includes the blades 100 provided in the above-mentioned embodiments, the wind power generator set provided in the embodiment of the present application has the technical effect of the technical solution of the blade 100 in any of the above-mentioned embodiments. Explanations of structures and terms that are the same as or corresponding to the above embodiments will not be repeated here.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (13)

1. A blade, characterized in that, comprising: The blade body (1) includes a shell (11) having an inner cavity, at least a partial area of the shell (11) is formed with a first conductive path; A lightning protection component (2), arranged on the blade body (1) and forming a second conductive path for transmitting lightning current, the second conductive path is arranged in parallel with the first conductive path; a discharge component (3), connected to at least one of the casing (11) and the lightning protection component (2), to form a discharge gap between the first conductive path and the second conductive path, The breakdown voltage of the discharge gap is smaller than the breakdown voltage of the casing (11). 2. The blade according to claim 1, characterized in that, the lightning protection component (2) is extended along the length direction of the blade body (1); The number of the discharge assembly (3) is one, the blade body has a tip section and a root section along the length direction, and the discharge assembly (3) is arranged on the tip section or the root section ; Alternatively, the number of the discharge components (3) is more than two, and more than two discharge components (3) are arranged at intervals along the length direction between the casing (11) and the lightning protection component (2 )between. 3. The blade according to claim 2, characterized in that, the lightning protection component (2) comprises at least one of a conductive mesh (21) and a downconductor (22); The discharge assembly (3) includes a first discharge module (S1) and/or a second discharge module (S2), and the first discharge module (S1) is used for the conductive grid (21) and the casing (11) ) to form a discharge gap, and the second discharge module (S2) is used to form a discharge gap between the downconductor (22) and the casing (11). 4. The blade according to claim 3, characterized in that, in the length direction, the conductive mesh (21) and the downconductor (22) are arranged in contact with each other. 5. The blade according to claim 3, characterized in that, in the length direction, the conductive mesh (21) and the downconductor (22) are at least partially overlapped, and (21) In the overlapping area with the downconductor (22), at least part of the first discharge module (S1) and the second discharge module (S2) are arranged in a misalignment in the length direction. 6. The blade according to claim 2, characterized in that, in the length direction, breakdown voltages of the discharge gaps formed by at least two of the discharge components (3) are different. 7. The blade according to claim 1, characterized in that the discharge assembly (3) comprises a first discharge part (31), one end of the first discharge part (31) is connected to the blade body (1) It is connected to one of the lightning protection components (2), and the other end extends toward the other of the blade body (1) and the lightning protection component (2) and forms the discharge gap with the other . 8. The blade according to claim 1, characterized in that, the discharge assembly (3) comprises a second discharge portion (32) and a third discharge portion (33), the second discharge portion (32) and the One end of the third discharge part (33) is respectively connected to the blade body (1) and the lightning protection assembly (2), and the second discharge part (32) and the third discharge part (33) The other end is oppositely arranged and forms the discharge gap. 9. The blade according to claim 7 or 8, characterized in that, the discharge assembly (3) further comprises a fourth discharge portion (34), the fourth discharge portion (34) is connected to the blade body (1 ) are connected and at least partially extend into the discharge gap, so as to separate the discharge gap to form a first sub-gap and a second sub-gap. 10. The blade according to claim 1, characterized in that, the end portion of the discharge component (3) used to form the discharge gap is set as at least one of a columnar structure, a needle-shaped structure, a spherical structure and a plate-shaped structure . 11. The blade according to claim 1, wherein the discharge gap is filled with a dielectric, and the dielectric is air; Alternatively, the blade further includes a housing part (4), the housing part (4) is at least partially sleeved on the outer periphery of the discharge assembly (3) and covers the discharge gap, and the dielectric is filled in the housing part Inside, the dielectric is set to be at least one of water, insulating oil and zinc oxide. 12. The blade according to claim 11, characterized in that, the blade body (1) further comprises a support (12), the support (12) is arranged in the inner cavity and is connected to the outer casing (11 ), the containing part (4) and/or the discharge assembly (3) is at least partially connected to the supporting part (12). 13. A wind power generating set, comprising the blade according to any one of claims 1 to 12.

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