CN110594108A - Blade tip lightning protection device, blade lightning protection system, fan blade and wind turbine - Google Patents

Abstract

The disclosure provides a blade body lightning protection device, which is installed on the blade body of a fan blade, and a main conduction down conductor is arranged inside the fan blade. Furthermore, the blade body lightning protection device includes a plurality of blade body lightning-termination devices, a plurality of blade body lightning-termination bases, a plurality of blade body conductive downconductors and an insulating layer. A plurality of blade body air receptors are arranged in multiple pairs, and the multiple pairs of blade body air receptors are arranged on the blade body of the fan blade at intervals along the axial direction of the fan blade. The two blade body air receptors of the same pair are respectively arranged on the On the windward side and the leeward side of the blade, the air-termination device of the blade body is exposed on the outer wall of the fan blade. A plurality of blade air-termination bases are arranged on the inner wall of the fan blade and respectively connected to a plurality of blade air-termination devices correspondingly. The plurality of blade body conduction down conductors are respectively connected between the plurality of blade body lightning-termination bases and the main conduction down conductor. The insulating layer is arranged on the outer periphery of the lightning-termination base of the blade body and the outer periphery of the conduction downconductor of the blade body.

Description

Blade tip lightning protection device, blade lightning protection system, fan blade and wind turbine

technical field

The present disclosure relates to the technical field of wind power generation equipment, in particular, to a blade body lightning protection device, a blade lightning protection system, a fan blade and a wind power generator.

Background technique

The lightning protection device of the fan blade is mainly used for the lightning protection of the fan blade. When there is lightning near the wind turbine blade, the lightning protection device can prevent the lightning from directly penetrating the fan blade, but protect the lightning through the correspondingly set lightning receptor. Intercept to ensure that the lightning strike occurs on the lightning receptor of the lightning protection device, and conduct the lightning strike current to the blade root of the fan blade through its own current down system, and then transfer it to the ground through the tower, thereby reducing the impact of lightning strike on the fan blade Damage, reduce direct and indirect economic losses caused by lightning, to ensure long-term continuous and effective power generation supply of wind turbines.

At present, the widely used lightning protection system for wind turbine blades mainly captures lightning current through lightning receptors installed on the surface of the blades, and then transmits the current to the interior of the blades for current conduction. The existing lightning protection device mainly includes two systems of lightning reception and conduction, and the two systems cooperate to realize lightning protection for fan blades. However, in the design of existing lightning protection devices, the cooperation of the two systems only considers simply connecting the various parts together to form an overall lightning protection system, but the overall process, structural layout, Problems such as local joints and internal blade metal exposure have not been fully explored and avoided.

Taking the Chinese invention patent CN101240772B as an example, it discloses a connection scheme of the air-terminating device at the tip of the blade, which mainly includes: an exposed air-terminating device containing a cavity and a conductor embedded in the blade and extending out of the blade; The cavity of the lightning receptor is used to slidably receive the conductive strip extending from the outer part of the blade; the exposed lightning receptor and the conductive strip protruding from the outer part of the blade are fastened and connected with detachable fasteners. Among them, this technical solution represents the design of the tip air-termination device of most existing fan blades, that is, adopts a non-detachable structure.

Taking the Chinese invention patent CN107076123A as an example again, it discloses a fully insulated tip unit of a lightning protection system for a blade, which mainly includes a conductive tip, wherein the tip is composed of an outer part and an inner part, at least one side receiver base, an inner tip The unit conductor, the outermost insulated cable forming the down-conductor, and the connection element that establishes the electrical connection between the insulated cable and the other conductive parts of the tip unit, wherein the inner part of the tip, the side receiver base, the inner tip conductor, the connection Both the element and one end of the insulated cable are cast embedded in the insulating material, leaving only the outer part of the tip and the other end of the insulated cable uncovered by the insulating material.

Based on the above, the lightning protection system design of the blades of the existing wind turbines is based on a number of fixed and discrete metal receivers on the surface of the blade tip and blade body as the main lightning capture device. These metal receivers are connected to the lightning receptor support inside the blade Connected to each other, and then connected to the hub through the internal down conductor of the blade, so as to release the lightning current to the ground through the tower. The internal system of the blade only plays the role of conducting current, and does not play the role of capturing current. In the connection position between the branch cable and the air-termination support, the connection position of multiple branch cables, and the air-termination support inside the blade There is a phenomenon of exposed metal. In fact, lightning does not always hit the air receptor smoothly, and sometimes enters the interior of the blade to form an arc. These metal conductors are very easy to become the object of lightning strikes. The lightning current enters the interior of the blade and has a large amount of energy. Not only will the electrical connection fail, causing the lightning protection device to fail, but it will also break down the surface material of the blade or cause the inside of the blade to burst.

In view of the problems existing in the above-mentioned prior art, it has become an important subject to be solved urgently in this field to provide a lightning protection system with any advantages such as simple operation, good insulation, and firm positioning.

Contents of the invention

A main purpose of the present disclosure is to overcome at least one defect of the above-mentioned prior art, and provide a blade body lightning protection device with better insulation and effective mitigation of cluster effect.

Another main purpose of the present disclosure is to overcome at least one defect of the above-mentioned prior art, and provide a blade lightning protection system having the above-mentioned blade body lightning protection device, a fan blade and a wind power generator.

In order to achieve the above purpose, the present disclosure adopts the following technical solutions:

According to one aspect of the present disclosure, a blade body lightning protection device is provided, which is installed on the blade body of a fan blade, and a main conductive downconductor is arranged inside the fan blade. Furthermore, the blade body lightning protection device includes a plurality of blade body lightning-termination devices, a plurality of blade body lightning-termination bases, a plurality of blade body conductive downconductors and an insulating layer. A plurality of air-termination air-terminations are arranged in multiple pairs, and the air-termination air-terminations are arranged at intervals along the axial direction of the fan blades on the blade air-termination of the fan blades. The blade body lightning receptors are respectively arranged on the windward side and the leeward side of the fan blade, and the blade body lightning receptors are exposed on the outer wall of the fan blade. A plurality of the blade air-termination bases are arranged on the inner wall of the fan blade and connected to the plurality of blade air-termination devices correspondingly. The plurality of blade body conductive down conductors are connected between the plurality of blade body lightning-termination bases and the main conductive down conductor respectively. The insulating layer is arranged on the outer periphery of the airfoil lightning-termination base and the outer periphery of the airfoil conductive downconductor.

According to one embodiment of the present disclosure, two adjacent pairs of the airfoil lightning receptors are arranged with a first interval in the axial direction of the fan blade. Wherein, the two blade body lightning receptors in the same pair are arranged at intervals of a second interval in the axial direction of the fan blade, and the second interval is smaller than the first interval.

According to one embodiment of the present disclosure, the blade body lightning receptor has a third end and a fourth end, the third end penetrates and is exposed on the outer wall of the fan blade, and the fourth end extends into the The inner cavity of the fan blade is pierced through the air-termination base of the blade body.

According to one embodiment of the present disclosure, the air-termination of the airfoil has a bolt structure, the third end is a screw head, the fourth end is a screw rod, and the end surface of the screw head is provided with an inner hexagon Slotted, and the screw part is screwed to the lightning-terminating base of the blade body.

According to one embodiment of the present disclosure, the screw head and the screw part are of a split structure, the screw head is detachably screwed to one end of the screw part, and the end of the screw part Another notch is formed.

According to one embodiment of the present disclosure, the material of the air-termination of the blade body is a high temperature resistant material.

According to one embodiment of the present disclosure, the air-termination base of the blade body has a first part and a second part in an integrated structure, the air-termination device of the blade body is connected to the first part, and the air-termination device of the blade body is connected to the first part. The down conductor is connected to the second part. Wherein, the projection size of the first portion on the inner wall of the fan blade is larger than the projection size of the second portion on the inner wall of the fan blade.

According to one embodiment of the present disclosure, the projection of the first part on the inner wall of the fan blade is circular, the projection of the second part on the inner wall of the fan blade is rectangular, and the first The outer diameter of the portion is greater than the width of the second portion.

According to one embodiment of the present disclosure, the end of the blade body conductive downconductor connected to the blade body lightning-termination base is provided with a second terminal, and the second connection terminal passes through the blade body. Attached to the flash base.

According to one embodiment of the present disclosure, the second connection terminal is provided with threads, and is screwed and fitted with the air-termination base of the blade body.

According to one embodiment of the present disclosure, the air-termination base of the blade body has a first surface and a second surface opposite to each other, and the air-termination base of the blade body is connected to the inner wall of the fan blade by its first surface. Wherein, the thickness of the portion of the insulating layer disposed on the first surface is smaller than the thickness of the portion of the insulating layer disposed on the second surface.

According to one embodiment of the present disclosure, the insulation layer is made of injection molded elastic material or die-cast composite material.

According to one embodiment of the present disclosure, an insulating skin is provided on the outer wall of the airfoil portion of the fan blade. And/or, the inner wall of the airfoil portion of the fan blade is provided with an insulating skin.

According to one embodiment of the present disclosure, the blade body lightning protection device further includes a plurality of blade body wire brackets. A plurality of blade body wire brackets are fixed on the inner wall of the fan blade and correspond to a plurality of blade body conductive down conductors, so that the blade body conductive down conductors are erected on the blade body wires stand.

According to one embodiment of the present disclosure, a base bracket is supported between the airfoil air-termination base provided on the inner wall of the windward side of the wind turbine blade and the inner wall of the leeward side.

According to another aspect of the present disclosure, a blade lightning protection system is provided, which is installed on a fan blade. The blade lightning protection system includes a blade tip lightning protection device, a blade body lightning protection device, and a main conductive downconductor. The tip lightning protection device and the blade body lightning protection device are respectively arranged at the blade tip and the blade body of the fan blade, and are respectively connected to the main conductive down conductor. Wherein, the blade body lightning protection device is the blade body lightning protection device described in the above embodiment.

According to one embodiment of the present disclosure, the end of the blade tip of the fan blade is open, and the blade tip lightning protection device includes a blade tip connector, a blade tip conductive downconductor, a blade tip lightning receptor, and an insulating Floor. The blade tip connector is arranged at the blade tip of the fan blade and includes a body part and two connecting parts, the connecting part is formed by extending from the body part to the end opening of the blade tip part, and the two connecting parts The two connecting parts are arranged oppositely at intervals and respectively correspond to the windward side and the leeward side of the fan blade. The blade tip conductive down conductor is connected between the body portion of the blade tip connector and the main conductive down conductor. The blade-tip air-termination device is arranged at the end opening of the blade-tip part of the fan blade, and the blade-tip air-termination device includes two metal air-termination plates, the shapes of the two metal air-termination plates are respectively The shapes of the windward side and the leeward side of the fan blade are matched to define the tip of the blade tip of the fan blade, and the two metal lightning receptors are detachably connected to the blade tip connector respectively. Two said connecting parts. The insulating layer is provided on the outer periphery of the body portion of the blade tip connector and the outer periphery of the blade tip conductive downconductor.

According to one embodiment of the present disclosure, a web is provided in the cavity of the fan blade. Wherein, the main conductive down conductor is arranged on the web.

According to still another aspect of the present disclosure, a fan blade is provided, including a blade body and a blade lightning protection system, and the blade lightning protection system is installed in the blade body. Furthermore, the blade lightning protection system is the blade lightning protection system described in the above embodiment.

According to yet another aspect of the present disclosure, a wind power generator is provided. Wherein, the wind power generator includes the fan blades described in the above embodiments.

It can be seen from the above technical solutions that the advantages and positive effects of the blade body lightning protection device, blade lightning protection system, fan blade and wind power generator proposed in the present disclosure are:

The airfoil lightning protection device proposed in this disclosure adopts "multiple pairs of airfoil air receptors arranged at intervals along the axial direction of the fan blade, and the two airfoil air receptors of the same pair are arranged on the windward side and the leeward side respectively. " design, compared with the design scheme of simply arranging multiple lightning receptors on the blade body adopted by the existing blade body lightning protection device, this disclosure is more suitable for the characteristics of the cluster effect of the blade body, and further alleviates the cluster effect. Moreover, the present disclosure makes the blade body lightning protection device eliminate the The parts other than the air-connector are provided with insulation protection by the insulating layer to ensure that the above-mentioned parts of the blade body lightning protection device are not exposed to metal, so that when the dielectric breakdown occurs inside the fan blade, the limit value is significantly increased, thereby preventing the blade inside An arc is formed to further reduce the damage to the interior of the blade caused by lightning strikes.

Description of drawings

Various objects, features and advantages of the present disclosure will become more apparent by considering the following detailed description of preferred embodiments of the present disclosure in conjunction with the accompanying drawings. The drawings are merely exemplary illustrations of the present disclosure and are not necessarily drawn to scale. In the drawings, the same reference numerals designate the same or similar parts throughout. in:

Fig. 1 is a schematic diagram of the shape of a conventional fan blade.

Fig. 2 is a schematic structural diagram of a blade tip lightning protection device according to an exemplary embodiment;

Fig. 3 is an enlarged sectional view of a part of the structure of the blade tip lightning protection device shown in Fig. 2;

Fig. 4 is an enlarged schematic view of another part of the structure of the blade tip lightning protection device shown in Fig. 2;

Fig. 5 is a structural schematic diagram of a blade tip connector of the blade tip lightning protection device shown in Fig. 2;

Fig. 6 is another structural schematic diagram of the blade tip connector of the blade tip lightning protection device shown in Fig. 2;

Fig. 7 is an enlarged cross-sectional view of the lightning-termination base of the blade tip lightning protection device shown in Fig. 2;

Fig. 8 is a schematic structural diagram of a blade body lightning protection device according to an exemplary embodiment;

Fig. 9 is a partial schematic diagram of the blade body lightning protection device shown in Fig. 8;

Fig. 10 is another partial schematic diagram of the blade body lightning protection device shown in Fig. 8;

Fig. 11 is a structural schematic diagram of the blade body lightning receptor of the blade body lightning protection device shown in Fig. 8;

Fig. 12 is a structural schematic diagram of the blade body lightning-termination base of the blade body lightning protection device shown in Fig. 8;

Fig. 13 is a sectional view along line A-A in Fig. 12;

Fig. 14 is a schematic structural diagram of a blade lightning protection system according to an exemplary embodiment;

Fig. 15 is a partial cross-sectional view of a fan blade according to an exemplary embodiment;

Fig. 16 is a schematic diagram of the installation state of the lightning-termination base of the blade tip lightning protection device shown in Fig. 2 .

Wherein, the reference signs are explained as follows:

100. Fan blades;

101. windward side; 102. leeward side; 110. blade tip; 111. tip; 120. blade body; 130. blade root; 140. insulation skin; 150. web;

200. Blade tip lightning protection device;

210. Blade tip connector; 2101. First end; 2102. Second end; 211. Body part; 2111. Lightening hole; 212. Connection part; 213. Rivet; Lightning terminal; 230. Blade tip conduction down conductor; 231. First terminal; 240. Insulation layer; 241. Insulation reinforcement; 250. Lightning base; 251. First base; .First flat slot; 252. Second base; 2521. Second flat slot; 253. Press block; 254. Lightning receptor; 255. Adhesive layer;

300. Blade body lightning protection device;

310. Blade air-termination device; 3101. Third end; 3102. Fourth end; 311. Screw head; 3111. Inner hexagon slot; 312. Screw part; Surface; 3202. Second surface; 321. First part; 322. Second part; 330. Blade conduction down conductor; 331. Second terminal; .base support;

400. Blade lightning protection system;

410. Main conduction down conductor; 411. Connector.

Detailed ways

Typical embodiments that embody the features and advantages of the present disclosure will be described in detail in the following description. It should be understood that the present disclosure can have various changes in different embodiments without departing from the scope of the present disclosure, and that the description and drawings therein are illustrative in nature and not intended to limit the present disclosure. public.

In the following description of various exemplary embodiments of the present disclosure, reference is made to the accompanying drawings, which form a part hereof, and in which are shown, by way of example, various exemplary structures, systems, which may implement aspects of the present disclosure and steps. It is to be understood that other specific arrangements of components, structures, exemplary devices, systems and steps may be utilized and structural and functional modifications may be made without departing from the scope of the present disclosure. Moreover, although the terms "end," "between," "side," etc. may be used in this specification to describe various exemplary features and elements of the disclosure, these terms are used herein for convenience only, for example, according to the appended Orientation of the example described in the figure. Nothing in this specification should be construed as requiring a particular three-dimensional orientation of structures in order to fall within the scope of this disclosure.

The disclosure provides a blade body lightning protection device, a blade lightning protection system with the blade body lightning protection device, a fan blade with the blade lightning protection system, and a wind generator with the fan blade. At the same time, a blade body lightning protection device will also be exemplarily described in the following description of the present disclosure. As shown in FIG. 1 , the above-mentioned lightning protection equipment proposed in this disclosure is described based on a typical fan blade 100, which has a windward surface 101 and a leeward surface 102, and is divided into blades in the axial direction of the blade. The tip portion 110 , the blade body portion 120 and the blade root portion 130 .

Implementation of blade body lightning protection device

Referring to FIG. 8 , FIG. 8 representatively shows a structural diagram of a blade body lightning protection device 300 that can embody the principles of the present disclosure. In this exemplary embodiment, the blade airfoil lightning protection device 300 proposed in the present disclosure is described by taking the lightning protection device applied to the blade airfoil portion 120 of the fan blade 100 of a wind power generator as an example. Those skilled in the art can easily understand that in order to apply the blade body lightning protection device 300 to fan blades 100 of other types of wind turbines, various modifications, additions, substitutions, deletions or other changes, these changes are still within the scope of the principles of the blade-air lightning protection device 300 proposed in the present disclosure.

As shown in FIG. 8 , in this embodiment, the blade body lightning protection device 300 proposed by the present disclosure is roughly installed on the blade body part 120 of the fan blade 100 , and the main conductive downconductor 410 is provided inside the fan blade 100 . Wherein, the blade body lightning protection device 300 mainly includes a plurality of blade body lightning receptors 310 , a plurality of blade body lightning receptor bases 320 , a plurality of blade body conductive down conductors 330 and an insulating layer 340 . With reference to Fig. 9 to Fig. 13, Fig. 9 representatively shows a partial schematic diagram of a blade body lightning protection device 300 capable of embodying the principle of the present disclosure; Fig. 10 representatively shows a blade body capable of embodying the principle of the present disclosure Another partial schematic diagram of the lightning protection device 300; FIG. 11 representatively shows a structural schematic diagram of the blade body lightning receptor 310 of the blade body lightning protection device 300 that can embody the principles of the present disclosure; FIG. 12 representatively shows 13 is a cross-sectional view along the line A-A in FIG. 12 . The structure, connection mode and functional relationship of each main component of the blade body lightning protection device 300 proposed in the present disclosure will be described in detail below with reference to the above-mentioned drawings.

As shown in FIG. 8 , in this embodiment, a plurality of blade air receptors 310 are arranged in multiple pairs, and multiple pairs of blade air receptors 310 are arranged at intervals along the axial direction of the fan blade 100 on the blade body of the fan blade 100 120 , the same pair of two airfoil receptors 310 are respectively arranged on the windward side 101 and the leeward surface 102 of the fan blade 100 , and the airfoil receptors 310 are exposed on the outer wall of the fan blade 100 . Wherein, two adjacent pairs of airfoil air receptors 310 are arranged with a first interval in the axial direction of the fan blade 100, and two airfoil air receptors 310 of the same pair are spaced with a second interval in the axial direction of the fan blade 100. arrangement, and the second distance is smaller than the first distance. That is, among the plurality of blade air receptors 310 , different pairs of blade air receptors 310 are arranged at large intervals, and the same pair of blade air receptors 310 are arranged at small intervals. Accordingly, compared with the existing design scheme in which the blade body air receptors 310 are simply and evenly arranged on the blade body, the arrangement design of the above blade body lightning receptors 310 in the present disclosure is more suitable for the characteristics of the cluster effect of the blade body, Further optimize the mitigation of cluster effects.

Further, in this embodiment, for the arrangement position of the blade body lightning receptor 310 on the blade body part 120 of the wind turbine blade 100, it is preferable to at least ensure that the area of the blade body part 120 is 1m to 5m away from the blade tip. (that is, the Area2 area of the existing wind turbine blade partition) is provided with the above-mentioned blade air-termination device 310 .

As shown in FIG. 9 to FIG. 11 , in this embodiment, the blade air receptor 310 has a third end 3101 and a fourth end 3102 . Wherein, the third end 3101 is pierced and exposed on the outer wall of the fan blade 100 , and the fourth end 3102 extends into the inner cavity of the fan blade 100 and is pierced in the air-termination base 320 of the blade body.

Further, as shown in Figures 9 to 11, in this embodiment, the airfoil air receptor 310 is preferably a bolt structure, the third end 3101 is the screw head 311, and the fourth end 3102 is the screw rod 312, and the end surface of the screw head 311 is provided with a notch for easy installation and disassembly, such as an inner hexagonal slot 3111, and the screw part 312 is screwed to the air-termination base 320 of the blade body.

Further, in this embodiment, the material of the screw head 311 of the airfoil air receptor 310 is preferably a high temperature resistant alloy material, such as S31603, 5 series aluminum alloy, etc., and the material of the screw part 312 is preferably a high temperature resistant tungsten alloy , such as tungsten carbide, or the material of the screw part 312 may also preferably be other high-temperature-resistant insulating materials, such as high-temperature-resistant glass fiber reinforced plastics.

Further, in this embodiment, the exposed area of the blade air receptor 310 , that is, the exposed area of the screw head 311 on the outer wall of the fan blade 100 is preferably greater than or equal to 200 mm ² .

In addition, in this embodiment, since the screw portion 311 and the screw portion 312 of the airfoil air receptor 310 are made of different materials, the screw portion 311 and the screw portion 312 of the airfoil air receptor 310 can be preferably Adopt split structure design. For example, the screw head 311 can be screwed to one end of the screw part 312 , and at this time, the notch on the end surface of the screw head 311 is used for connecting it to the screw part 312 . The end surface of the end of the screw part 312 can also be provided with a structure similar to the above-mentioned notch (for example, preferably an inner hexagonal slot), which can be used to connect the airfoil lightning receptor 310 (that is, the connected screw head 311 and the screw) Part 312) is connected to the operation when the airfoil air-termination base 320 is connected. In other embodiments, when the material of the screw part 311 and the screw part 312 are the same, the above split structure design can also be selected. Alternatively, when the materials of the screw head 311 and the screw rod 312 are different, the two can also be integrally formed by other existing manufacturing processes.

Further, in this embodiment, based on the grooved design of the screw head 311 and the screw rod 312 , after the airfoil air receptor 310 is screwed and fixed, the grooved structure can preferably be sealed with high temperature resistant silica gel.

Further, in this embodiment, the blade body air receptor 310 can preferably be installed on the corresponding position of the fan blade 100 by drilling and tapping after the windward surface 101 of the fan blade 100 or the present invention 102 is demolded.

As shown in FIG. 8 , in this embodiment, a plurality of blade air-termination bases 320 are disposed on the inner wall of the wind turbine blade 100 and connected to a plurality of blade air-termination devices 310 correspondingly. Moreover, the above-mentioned preferred solution regarding the arrangement of the plurality of blade air-termination receptors 310 can also be regarded as the arrangement manner of the plurality of blade air-termination bases 320 .

As shown in FIG. 12 , in this embodiment, the airfoil air-termination base 320 has a first part 321 and a second part 322 in an integral structure. Wherein, the blade body lightning receptor 310 is connected to the first part 321, the blade body conductive down conductor 330 is connected to the second part 322, and the projection size of the first part 321 on the inner wall of the fan blade 100 is larger than that of the second part 322 The dimension of the projection on the inner wall of the fan blade 100 .

Further, as shown in FIG. 12 , in this embodiment, the projection of the first part 321 on the inner wall of the fan blade 100 is circular, and the projection of the second part 322 on the inner wall of the fan blade 100 is rectangular. The outer diameter of the portion 321 is larger than the width of the second portion 322 . In other embodiments, the shapes of the projections of the first portion 321 and the second portion 322 on the inner wall of the fan blade 100 can also be flexibly selected, and are not limited to this embodiment.

Further, as shown in FIG. 13 , in this embodiment, the blade-body air-termination base 320 has opposite first surfaces 3201 and second surfaces 3202 , and the blade-body air-termination base 320 is connected to the first surface 3201 The inner wall of the fan blade 100 . Wherein, the thickness of the portion of the insulating layer 340 disposed on the first surface 3201 is preferably smaller than the thickness of the portion of the insulating layer 340 disposed on the second surface 3202 . Accordingly, when punching bolt holes (that is, the bolt holes used for installing the screw part 312 of the blade air-termination device 310 ) to the air-termination base 320 of the blade body, the design of the above-mentioned different thicknesses of the insulating layer 340 is conducive to the above-mentioned bolt hole drilling. The operation can prevent the insulation failure caused by the insulation layer 340 being pierced when the bolt holes are drilled.

Further, as shown in FIG. 10 , in this embodiment, for the blade air-termination base 320 disposed on the inner wall of the windward side 101 , a base bracket 360 is preferably supported between it and the inner wall of the leeward side 102 . According to this, since the manufacturing process of the existing fan blade 100 is usually to firstly set the leeward side 102, and set the components that should be accommodated in the inner cavity of the fan blade 100 on the inner wall of the leeward side 102, and then assemble the windward side 101 to the leeward side 102. , so the above-mentioned design can adapt to the above-mentioned manufacturing process of the windward side 101 and the leeward side 102, and is easy to operate. That is, the airfoil lightning-terminating base 320 arranged on the inner wall of the windward side 101 is first supported and connected to the leeward side 102 by the base bracket 360 during the manufacturing process, and then the airfoil lightning-terminating base 320 is installed in the process of assembling the windward side 101 Fitted and fixed with the inner wall of the windward side 101.

As shown in Fig. 8 to Fig. 10, in this embodiment, a plurality of blade body conductive down conductors 330 are respectively connected between a plurality of blade body air-termination bases 320 and the main conductive down conductor 410, and The current generated by the lightning strike of the blade air-termination device 310 is conducted to the main conductive down conductor 410 through the blade body connector and the blade body conductive down conductor 330, and further conducted to the blade root through the main conductive down conductor 410 part 130, and is transmitted to the tower from the blade root part 130. Moreover, the above-mentioned preferred solution for the arrangement of the plurality of airfoil air receptors 310 can also be regarded as the arrangement of the plurality of airfoil conductive down conductors 330 .

As shown in Figures 12 and 13, in this embodiment, the end of the blade body conductive downconductor 330 connected to the blade body lightning-termination base 320 is provided with a second connection terminal 331, and the second connection terminal 331 is passed through Lightning receiving base 320 on the blade body.

Further, as shown in FIG. 12 , in this embodiment, the second connection terminal 331 is preferably provided with threads, and is screwed and matched with the air-termination base 320 of the blade body.

Further, in this embodiment, the airfoil conductive downconductor 330 may preferably be connected to the main conductive downconductor 410 through the connecting piece 411 . The connecting piece 411 may preferably adopt a connecting copper pipe, a C-shaped clip, a parallel clip, and the like.

Furthermore, in this embodiment, after the airfoil conduction downconductor 330 and the main conduction downconductor 410 are connected through the connecting piece 411, the following process can be preferably used for reinforcement: first, heat-shrinkable tubes are used for insulation treatment , followed by epoxy adhesive for insulation sealing (adhesive can be placed directly in the special insulation molding prefabricated parts, insulation molding prefabrication according to the shape after connection), after sealing, use two layers of Bi808 biaxial glass fiber cloth To strengthen.

As shown in Fig. 8, in this embodiment, the insulating layer 340 is arranged on the outer periphery of the airfoil air-termination base 320 and the outer periphery of the airfoil conductive downconductor 330, and the insulating layer 340 arranged on the outer periphery of the above parts can preferably adopt One-piece connected structure. Accordingly, all exposed metal surfaces in the inner cavity of the fan blade 100 are covered by casting insulating materials to form the insulating layer 340 , thereby ensuring that no metal is exposed. When a dielectric breakdown occurs at the blade, the limit value increases significantly, thereby preventing internal arcing and precluding damage to the blade interior. In addition, through the insulation protection of the inner metal surface of the blade, other discharge paths of the lightning current are prevented, and the path of the lightning current outside the blade is further guaranteed, increasing the effectiveness of the lightning-termination device 310 on the blade body.

Further, in this embodiment, the insulating layer 340 is preferably made of injection molded elastic material or die-cast composite material, such as cross-linked polyethylene or BMC/DMC (Bulk/Dough molding compounds, bulk molding compound).

Accordingly, in this embodiment, the insulation layer 340 of the blade body lightning protection device 300 can be roughly divided into a base insulation layer and a cable insulation layer according to the protection area.

Further, in this embodiment, in order to enhance the bonding performance between the insulating layers 340 in the above different regions, grids, barbs, etc. can be set in the bonding area between the base insulating layer and the cable insulating layer to enhance the bonding performance Structure.

Further, in this embodiment, the withstand voltage level of the insulating layer 340 is preferably greater than or equal to 17.5KV.

As shown in FIG. 9 and FIG. 10 , in this embodiment, the blade body lightning protection device 300 further includes a plurality of blade body line brackets 350 for fixing and supporting the blade body conductive downconductor 330 in the fan blade 100 . Wherein, a plurality of blade body line supports 350 are fixed on the inner wall of the fan blade 100 and correspond to the plurality of blade body conductive down conductors 330 , so that the blade body conductive down conductors 330 are erected on the blade body line supports 350 .

In addition, in this embodiment, in the design of each metal structure of the blade airfoil lightning protection device 300 described above, it is preferable to adopt a design that removes sharp corners of the metal structure to further alleviate the problem of charge concentration.

In addition, in this embodiment, the outer wall of the airfoil portion 120 of the fan blade 100 is provided with an insulating skin, and the inner wall of the airfoil portion 120 of the fan blade 100 is provided with an insulating skin. Accordingly, through the setting of the insulating skin, a skin insulation strengthening protection area centered on the air-termination device 310 of the blade body is formed, and insulating coating, insulating film, perfusion, hand lay-up are applied on the outer surface or inner surface of the blade within a certain range. Insulating material or insulating adhesive. When the space electric field induces the internal metal parts wrapped in the insulating material and breaks down the insulating material to appear an upward leader, the reinforced protection area of the insulating skin insulation can ensure that the current crawls inside the blade, so that the current will not break through the structural layer, resulting in the failure of the structural layer .

It is easy to understand that, based on the above-mentioned design of the insulating skin, the various components of the blade body lightning protection device 300 arranged on the inner wall of the fan blade 100, such as the blade body lightning-terminating base 320, the blade body line bracket 350 and the base bracket 360, etc., are actually Both are arranged on the insulating skin of the inner wall of the fan blade 100 .

It should be noted here that the blade airfield lightning protection device shown in the drawings and described in this specification is only one example of many types of blade airfield lightning protection devices that can employ the principles of the present disclosure. It should be clearly understood that the principles of the present disclosure are by no means limited to any details of the blade airfoil lightning protection device or any components of the blade airfoil lightning protection device shown in the drawings or described in this specification.

To sum up, the airfoil lightning protection device proposed in the present disclosure adopts "multiple pairs of airfoil air-termination devices arranged at intervals along the axial direction of the fan blade, and the two air-foil air-termination devices of the same pair are respectively arranged on the Compared with the design scheme of simply arranging multiple lightning receptors on the blade body adopted by the existing blade body lightning protection device, this disclosure is more suitable for the characteristics of the cluster effect of the blade body, and further Mitigate the cluster effect (due to the existence of the atmospheric electric field, the electric field formed around the conductive downconductor of the blade lightning protection system is greatly increased. When there are too many conductive downconductors in a certain area, the electric field in this area will be caused Much higher than other areas, forming a cluster effect of the electric field). Moreover, the present disclosure makes the blade body lightning protection device eliminate the The parts other than the air-connector are provided with insulation protection by the insulating layer to ensure that the above-mentioned parts of the blade body lightning protection device are not exposed to metal, so that when the dielectric breakdown occurs inside the fan blade, the limit value is significantly increased, thereby preventing the blade inside An arc is formed to further reduce the damage to the interior of the blade caused by lightning strikes.

Implementation of blade tip lightning protection device

Referring to FIG. 2 , FIG. 2 representatively shows a structural diagram of a blade tip lightning protection device 200 capable of embodying the principles of the present disclosure. In this exemplary embodiment, the blade tip lightning protection device 200 proposed in the present disclosure is described by taking the lightning protection device applied to the blade tip portion 110 of the fan blade 100 of a wind power generator as an example. Those skilled in the art can easily understand that, in order to apply the blade tip lightning protection device 200 to fan blades 100 of other types of wind turbines, various modifications, additions, substitutions, deletions or other changes, which are still within the scope of the principles of the tip lightning protection device 200 presented in this disclosure.

As shown in Fig. 2, in this embodiment, the blade tip lightning protection device 200 proposed by the present disclosure is roughly installed on the blade tip 110 of the fan blade 100, and the main conductive down conductor 410 is arranged inside the fan blade 100, and the fan The tip portion 110 of the blade 100 is open at the end. Wherein, the blade tip lightning protection device 200 mainly includes a blade tip connector 210 , a blade tip conductive downconductor 230 , a blade tip lightning receptor 220 and an insulating layer 240 . With reference to Fig. 3 to Fig. 7, Fig. 3 representatively shows an enlarged cross-sectional view of a part of the structure of the blade tip lightning protection device 200 which can embody the principle of the present disclosure; Fig. 4 representatively shows the structure which can embody the principle of the present disclosure An enlarged schematic diagram of another part of the structure of the blade tip lightning protection device 200; FIG. Another structural schematic diagram of the blade tip connector 210 of the blade tip lightning protection device 200 that can embody the principle of the present disclosure is schematically shown; FIG. 7 representatively shows the blade tip lightning protection device 200 that can embody the principle of the present disclosure An enlarged cross-sectional view of the lightning receiving base 250 of FIG. The structure, connection mode and functional relationship of each main component of the blade tip lightning protection device 200 proposed in the present disclosure will be described in detail below with reference to the above-mentioned drawings.

As shown in FIGS. 2 and 3 , in this embodiment, the blade tip connector 210 is disposed at the blade tip portion 110 of the fan blade 100 and includes a body portion 211 and two connection portions 212 . Wherein, the connection portion 212 is formed by extending from the body portion 211 to the end opening of the blade tip portion 110 (approximately along the axial direction of the fan blade 100 ), and the two connection portions 212 are arranged opposite to each other and correspond to the windward surface of the fan blade 100 respectively. 101 and the leeward side 102, the two connecting parts 212 are respectively used to detachably connect the two metal lightning receptors 221 of the blade tip lightning receptor 220.

In this embodiment, the blade tip connector 210 preferably adopts a split design, that is, it includes two sub-connectors arranged oppositely. Specifically, the two sub-connectors are respectively arranged on the inner wall of the windward side 101 and the inner wall of the leeward side 102 of the fan blade 100, and each sub-connector has a sub-body part 211 and an end opening extending from the sub-body part 211 to the blade tip part 110. The sub-connection part 212 formed. The two sub-connectors connect the sub-body parts 211 of the two sub-connectors together detachably through connecting pieces such as bolts or rivets, so that the two sub-body parts 211 are fitted and connected together to form the body part 211 of the blade tip connector 210, The two sub-connecting parts 212 are spaced apart to respectively form the two connecting parts 212 of the blade tip connector 210 . Through the above design, and based on the design of the two metal lightning receptors 221 of the blade tip lightning receptor 220, the connection structure between the blade tip connector 210 and the blade tip lightning receptor 220 can be respectively corresponding to the windward side 101 and the leeward side. 102 split design, according to this, because the manufacturing process of the existing fan blade 100 is usually to set the leeward side 102 first, and set the parts that should be accommodated in the inner cavity of the fan blade 100 on the inner wall of the leeward side 102, and then install the windward side 101 Assembled on the leeward side 102, the above-mentioned design can adapt to the above-mentioned manufacturing process of the windward side 101 and the leeward side 102, and is easy to operate. In other embodiments, the blade tip connector 210 may also adopt an integrated structure, which is not limited to this embodiment.

Further, as shown in FIG. 5 and FIG. 6 , in this embodiment, the body portion 211 of the blade tip connector 210 has a first end 2101 and a second end 2102 , and the first end 2101 is closer to the blade tip than the second end 2102 Lightning receptor 220. Accordingly, the size of the second end 2102 is preferably larger than the size of the first end 2101, so that the main body 211 has the function of stopping the axial retreat relative to the fan blade 100, and avoids the blade tip caused by the centrifugal force generated by the rotation of the fan blade 100 during operation. The connector 210 comes out.

Furthermore, as shown in FIG. 5 and FIG. 6 , in this embodiment, the shape of the body part 211 from the second end 2102 to the first end 2101 is substantially wedge-shaped.

Further, as shown in FIG. 5 , in this embodiment, a plurality of weight reducing holes 2111 are opened on the body portion 211 of the blade tip connector 210 to reduce the weight of the blade tip connector 210 .

Furthermore, in this embodiment, for the plurality of weight-reducing holes 2111 opened on the main body 211 , it may also preferably be filled with compression molding and molding materials to further enhance its structural strength.

As shown in Figure 2, in this embodiment, the blade tip conductive down conductor 230 is connected between the body part 211 of the blade tip connector 210 and the main conductive down conductor 410, and is used to connect the blade tip lightning receptor 220, the current generated by the lightning strike is conducted to the main conductive down conductor 410 through the blade tip connector 210 and the blade tip conductive down conductor 230, and further conducted to the blade root part 130 by the main conductive down conductor 410, and is transmitted by the blade tip The root portion 130 is conducted to the tower.

Further, as shown in FIG. 4 , in this embodiment, the blade tip conductive downconductor 230 is detachably connected to the body portion 211 of the blade tip connector 210 through the first connection terminal 231 . Specifically, the first connection terminal 231 is roughly in the shape of a bolt and has a screw part and a nut part. The outer periphery of the screw part is provided with a screw thread and is threadedly matched with the screw hole opened in the body part 211. The nut part is arranged at one end of the screw part and connected to The down conductor 230 is conducted at the tip of the blade. In other embodiments, other structures may be used instead of the bolt structure as the blade tip conductive downconductor 230 is connected to the first connection terminal 231 of the blade tip connector 210 , and the present embodiment is not limited thereto.

Further, in this embodiment, the blade tip conductive downconductor 230 may preferably be connected to the main conductive downconductor 410 through the connecting piece 411 . The connecting piece 411 may preferably adopt a connecting copper pipe, a C-shaped clip, a parallel clip, and the like.

Furthermore, in this embodiment, after the blade tip conductive downconductor 230 and the main conductive downconductor 410 are connected through the connecting piece 411, the following process can be preferably used for reinforcement: first, heat-shrinkable tubes are used for insulation treatment , followed by epoxy adhesive for insulation sealing (adhesive can be placed directly in the special insulation molding prefabricated parts, insulation molding prefabrication according to the shape after connection), after sealing, use two layers of Bi808 biaxial glass fiber cloth To strengthen.

As shown in FIG. 2 and FIG. 3 , in this embodiment, the blade tip lightning receptor 220 is disposed at the end opening of the blade tip portion 110 of the wind turbine blade 100 . Specifically, the blade tip air-termination device 220 includes two metal air-termination plates 221, the shapes of the two metal air-termination plates 221 are respectively matched with the shapes of the windward side 101 and the leeward side 102 of the fan blade 100, thereby defining the The tip 111 of the blade tip part 110 of 100 and the two metal lightning receptors 221 are detachably connected to the two connecting parts 212 of the blade tip connector 210 . In other implementation manners, the blade tip lightning receptor 220 may also adopt an integral hollow structure or a solid structure design, which is not limited to this embodiment.

Further, as shown in FIG. 3 , in this embodiment, the metal lightning receptor 221 and the connecting portion 212 are preferably detachably connected by a plurality of rivets 213 .

Further, in this embodiment, the material of the air-termination device 220 at the tip of the blade may preferably be a high-temperature-resistant, corrosion-resistant alloy, such as S31603, 5-series aluminum alloy, and the like.

Moreover, as shown in FIG. 2 , FIG. 4 and FIG. 7 , in this embodiment, the blade tip lightning protection device 200 proposed in the present disclosure further includes a lightning receiving base 250 . Specifically, the lightning receptor base 250 is disposed on the blade tip conductive down conductor 230 and located between the blade tip connector 210 and the main conductive down conductor 410 . The lightning receiving base 250 mainly includes a first base 251 and a second base 252 . One of the first base 251 and the second base 252 is connected to the windward surface 101 of the fan blade 100 , and the other is connected to the leeward surface 102 of the fan blade 100 . The first base 251 and the second base 252 are docked with each other, and the end of the first base 251 facing the second base 252 is provided with a wire groove 2511, and the wire groove 2511 and the end of the second base 252 facing the first base 251 jointly define a line hole. Wherein, the blade tip conductive downconductor 230 passes through the wire hole, and is supported and positioned between the windward side 101 and the leeward side 102 of the fan blade 100 by the lightning receptor base 250 .

Further, as shown in FIG. 7 , in this embodiment, the lightning receptor base 250 further includes a pressing block 253 . Specifically, the end of the first base 251 facing the second base 252 is provided with a first flat slot 2512, which can be used to apply a pre-tightening force. At the bottom of the groove, the end of the second base 252 facing the first base 251 is provided with a second flat groove 2521, which can be used to apply a pre-tightening force, and the second flat groove 2521 is screwed into the first This end of the base 251 . A pressing block 253 is disposed between the bottom of the first flat slot 2512 and the bottom of the second flat slot 2521 , and the wire hole is defined by the wire slot 2511 and the pressing block 253 . Accordingly, the air-termination base 250 presses the blade tip conductive downconductor 230 through the pressing block 253 and the wire slot 2511 , thereby forming an electrical connection.

Further, as shown in FIG. 16 , in this embodiment, the shape of the end of the first base 251 connected to the fan blade 100 and the shape of the fan blade 100 are preferably matched to each other. Moreover, the shape of the end of the second base 252 connected to the fan blade 100 is preferably matched with the shape of the fan blade 100 .

Further, in this embodiment, based on the design that the shape of the end of the first base 251 or the second base 252 matches the shape of the part of the fan blade 100 to which it is connected, the side wall of the lightning receiving base 250 may preferably be approximately The plane perpendicular to one of the windward side and the leeward side of the fan blade 100 is located. As shown in FIG. 16 , taking the side wall of the lightning-termination base 250 as an example substantially perpendicular to the leeward surface 102 of the fan blade 100 , due to the blade-shaped structure of the fan blade 100 , the side wall of the lightning-termination base 250 is relatively perpendicular to the windward surface 102 of the fan blade 100 . The windward surface 101 is in an inclined state. At this time, the plane where the notch of the wire slot 2511 is located is preferably parallel to the leeward surface of the fan blade 100 , and vice versa.

Further, in this embodiment, as shown in FIG. 16 , lightning receptors 254 are respectively provided on the windward side and the leeward side of the fan blade 100 corresponding to the positions of the lightning receptor base 250 . Specifically, a screw hole is provided on the end face of the first base 251 connected to the fan blade 100 , and one of the lightning receptors 254 is screwed and fixed in the screw hole, and the lightning receptor 254 passes through the lightning receptor base 250 and is wrapped. The covering insulating layer 240 and the adhesive layer 255 bonding the first base 251 and the fan blade 100 are exposed on the fan blade 100 . Correspondingly, the end surface of the second base 252 connected to the fan blade 100 is provided with a screw hole, wherein another lightning receptor 254 is screwed and fixed to the screw hole, and the lightning receptor 254 passes through the lightning receptor base 250 and is wrapped. The covering insulating layer 240 and the adhesive layer 255 bonding the second base 252 and the fan blade 100 are exposed on the fan blade 100 . Wherein, for the specific design of the above-mentioned air-termination device 254, reference may be made to the detailed description of the blade-body air-termination device in the following embodiments of the blade-body air-termination device, and details are not repeated here.

Further, in this embodiment, the distance between the lightning receptor base 250 and the tip 111 of the blade tip 110 is preferably 1 m to 3 m.

As shown in FIGS. 2 to 4 , in this embodiment, the insulating layer 240 is disposed on the outer periphery of the body portion 211 of the blade tip connector 210 and the outer periphery of the blade tip conductive downconductor 230 , and the insulating layer 240 disposed on the outer periphery of the above-mentioned parts Layer 240 may preferably adopt an integrally connected structure.

Further, in this embodiment, the insulating layer 240 is preferably made of injection molded elastic material or die-cast composite material, such as cross-linked polyethylene or BMC/DMC (Bulk/Dough molding compounds, bulk molding compound).

Further, as shown in FIG. 4 , in this embodiment, a plurality of insulating reinforcing ribs 241 are provided on the outer periphery of the insulating layer 240 . Specifically, one end of the insulating reinforcing rib 241 is connected to the portion of the insulating layer 240 located at the outer periphery of the main body portion 211 , and the other end of the insulating reinforcing rib 241 is connected to a portion of the insulating layer 240 located at the outer periphery of the tip conductive downconductor 230 .

In addition, the insulating layer 240 is also disposed on the outer periphery of the lightning-termination base 250 , and has an integral structure with the insulating layer 240 disposed on the outer periphery of other components of the blade tip connector 210 . That is, the insulating layer 240 is provided on the outer periphery of the main body 211 , the outer periphery of the blade tip conductive downconductor 230 and the outer periphery of the lightning-termination base 250 . Accordingly, all exposed metal surfaces in the inner cavity of the fan blade 100 are covered by casting insulating materials to form the insulating layer 240 , thereby ensuring that no metal is exposed. When a dielectric breakdown occurs at the blade, the limit value increases significantly, thereby preventing internal arcing and precluding damage to the blade interior. In addition, through the insulation protection of the inner metal surface of the blade, other discharge paths of the lightning current are prevented, and the path of the lightning current outside the blade is further guaranteed, increasing the effectiveness of the lightning-termination device 220 at the tip of the blade.

Accordingly, in this embodiment, the insulation layer 240 of the blade tip lightning protection device 200 can be roughly divided into a connection plate insulation layer, a base insulation layer and a cable insulation layer according to the protection area.

Further, in this embodiment, in order to enhance the bonding performance between the insulating layers 240 in the above different regions, grids, barbs, etc. can be set in the bonding area between the insulating layer of the connecting plate and the insulating layer of the base to enhance the bonding performance Structure. The above-mentioned insulation reinforcing rib 241 is a structure arranged between the insulating layer of the connecting plate and the insulating layer of the cable to enhance the bonding performance.

Further, in this embodiment, the withstand voltage level of the insulating layer 240 is preferably greater than or equal to 17.5KV.

In addition, in this embodiment, in the design of each metal structure of the blade tip lightning protection device 200 described above, it is preferable to adopt a design that removes sharp corners of the metal structure to further alleviate the problem of charge concentration.

In addition, in this embodiment, the outer wall of the blade tip portion 110 of the fan blade 100 is provided with an insulating skin, and the inner wall of the blade tip portion 110 of the fan blade 100 is provided with an insulating skin. Accordingly, through the setting of the insulating skin, a skin insulation strengthening protection area centered on the blade tip air receptor 220 is formed, and insulating coating, insulating film, perfusion, hand lay-up are applied on the outer surface or inner surface of the blade within a certain range. Insulating material or insulating adhesive. When the space electric field induces the internal metal parts wrapped in the insulating material and breaks down the insulating material to appear an upward leader, the reinforced protection area of the insulating skin insulation can ensure that the current crawls inside the blade, so that the current will not break through the structural layer, resulting in the failure of the structural layer .

It is easy to understand that, based on the above-mentioned design of the insulating skin, the components of the blade tip lightning protection device 200 arranged on the inner wall of the fan blade 100, such as the blade tip connector 210 and the lightning receiving base 250, etc., are actually arranged on the fan blade 100. On the insulating skin of the inner wall of the blade 100.

It should be noted here that the blade tip lightning protection shown in the drawings and described in this specification is but one example of many types of blade tip lightning protection that can employ the principles of the present disclosure. It should be clearly understood that the principles of the present disclosure are by no means limited to any details of the blade tip lightning protection device or any components of the blade tip lightning protection device shown in the drawings or described in this specification.

To sum up, the blade tip lightning protection device proposed in this disclosure, through the design of "the insulating layer is provided on the outer periphery of the body part of the blade tip connector and the outer periphery of the blade tip conductive down conductor", makes the blade tip lightning protection device Parts other than the air-terminating device at the tip of the blade are protected by an insulating layer to ensure that there is no exposed metal in the above-mentioned parts of the lightning protection device at the tip of the blade, so that when the dielectric breakdown occurs inside the fan blade, the limit value will be significantly increased, thereby preventing An arc is formed inside the blade, which further reduces the damage to the inside of the blade caused by lightning strikes. Moreover, the present disclosure can improve the blade tip air-termination through the design of "the shapes of the two metal air-termination plates are respectively matched with the shapes of the windward side and the leeward side of the fan blade to define the tip of the fan blade tip". The lightning effect of the device, while ensuring the structural integrity of the blade tip of the fan blade. In addition, since the blade-tip air-termination is detachably connected to the blade-tip connector, maintenance and replacement of the blade-tip air-termination can be facilitated.

Furthermore, in one of the embodiments of the present disclosure, by adopting the design that "the blade tip connector includes two sub-connectors arranged oppositely, and the two sub-connectors are respectively arranged on the inner wall of the windward side and the inner wall of the leeward side of the fan blade", The process of setting the air-terminating device on the fan blade through the blade-tip connector is more in line with the structural process of the fan blade itself, which is convenient for processing and manufacturing.

Furthermore, in one of the embodiments of the present disclosure, through the setting of the lightning-terminating base, it is possible to effectively alleviate the cluster effect of the blade tip lightning protection device, especially the conductive downconductor of the blade tip (due to the existence of the atmospheric electric field, the The electric field formed around the conductive downconductor of the blade lightning protection system increases significantly. When the number of conductive downconductors in a certain area is too large, the electric field in this area is much higher than that in other areas, forming a cluster effect of the electric field ).

Implementation of blade lightning protection system

Referring to FIG. 14 , FIG. 14 representatively shows a structural diagram of a blade lightning protection system 400 capable of embodying the principles of the present disclosure. In this exemplary embodiment, the blade lightning protection system 400 proposed in the present disclosure is described by taking a lightning protection system applied to a fan blade 100 of a wind power generator as an example. Those skilled in the art can easily understand that, in order to apply the blade lightning protection system 400 to fan blades 100 of other types of wind turbines, various modifications, additions, substitutions, and deletions are made to the following specific embodiments or other variations that are still within the scope of the principles of the blade lightning protection system 400 presented in this disclosure.

As shown in FIG. 14 , in this embodiment, the blade lightning protection system 400 proposed by the present disclosure is installed in the fan blade 100 to provide lightning protection function for the fan blade 100 . The blade lightning protection system 400 mainly includes the blade tip lightning protection device 200 and the blade body lightning protection device 300 proposed in the present disclosure and specifically described in the above embodiments, and also includes a main conductive downconductor 410 . Specifically, the blade tip lightning protection device 200 and the blade body lightning protection device 300 are respectively arranged on the blade tip portion 110 and the blade body portion 120 of the fan blade 100 , and are respectively connected to the main conductive down conductor 410 .

As shown in Fig. 14, in this embodiment, since the blade lightning protection system 400 adopts the design of the blade tip lightning protection device 200 and the blade body lightning protection device 300 proposed in the present disclosure at the same time, the partial structures of the two sets of lightning protection devices can be Make appropriate changes, additions, subtractions, or combinations. For example, the blade tip conductive down conductor 230 of the blade tip lightning protection device 200 and the blade body conductive down conductor 330 closest to the blade tip of the blade body lightning protection device 300 can be connected to the main transmission through the same connecting piece 411. Guide downline 410 to connect. As another example, the insulating layer 240 of the blade tip lightning protection device 200 and the insulating layer 340 of the blade body lightning protection device 300 may be merged into an integrated insulating layer at the outer periphery of the connecting member 411 .

As shown in FIG. 9 and FIG. 10 , a web 150 is disposed in the inner cavity of the fan blade 100 , and accordingly, the main conductive downconductor 410 is preferably disposed on the web 150 .

It should be noted that, in other implementation manners, the blade lightning protection system 400 is not limited to include both the blade tip lightning protection device 200 and the blade body lightning protection device 300 proposed in the present disclosure. That is, in another embodiment, the blade lightning protection system 400 may include the blade tip lightning protection device 200 proposed in this disclosure and other existing blade body lightning protection devices, or only include the blade tip lightning protection device 200 proposed in this disclosure . In yet another embodiment, the blade lightning protection system 400 may include the blade body lightning protection device 300 proposed in this disclosure and other existing blade tip lightning protection devices, or only include the blade body lightning protection device 300 proposed in this disclosure.

It should be noted at this point that the blade lightning protection system shown in the drawings and described in this specification is but one example of many types of blade lightning protection systems that can employ the principles of the present disclosure. It should be clearly understood that the principles of the present disclosure are by no means limited to any details of the blade lightning protection system or any components of the blade lightning protection system shown in the drawings or described in this specification.

Implementation of fan blades

Based on the above description, the present disclosure also provides a fan blade, which mainly includes a blade body and a blade lightning protection system. Wherein, the blade lightning protection system is installed in the blade body, and the blade lightning protection system is the blade lightning protection system 400 proposed in the present disclosure and specifically described in the above-mentioned embodiments.

Further, as shown in FIG. 15 , in this embodiment, the outer and inner walls of the blade tip and blade body of the fan blade are provided with insulating skins 140 (only one side wall is shown in the figure). Accordingly, through the setting of the insulating skin 140, a skin insulation strengthening protection area centered on the blade tip air-termination and blade body air-termination proposed in the present disclosure is formed, and the insulation is applied to a certain range on the outer surface or inner surface of the blade. Coating, insulating film, potting, hand lay-up insulating compound or insulating adhesive. When the space electric field induces the internal metal parts wrapped in the insulating material and breaks down the insulating material to appear an upward leader, the reinforced protection area of the insulating skin insulation can ensure that the current crawls inside the blade, so that the current will not break through the structural layer, resulting in the failure of the structural layer .

In other implementations, when the blade lightning protection system of the fan blade only has the blade tip lightning protection device proposed in the present disclosure, an insulating skin 140 may be provided on the outer wall and the inner wall of the blade tip. When the blade lightning protection system of the wind turbine blade only has the blade body lightning protection device proposed in the present disclosure, an insulating skin 140 may be provided on the outer wall and the inner wall of the blade body.

Further, for the insulating skin 140 corresponding to the blade tip lightning protection device, the insulating skin 140 may preferably be provided in the region of 5m of the blade tip of the fan blade. For the insulating skin 140 corresponding to the lightning protection device of the blade body, the insulating skin 140 can preferably be provided in the area of 0.75m from the blade body lightning receptor towards the blade root and the blade tip.

It should be noted at this point that the fan blade shown in the drawings and described in this specification is but one example of many types of fan blades with which the principles of the present disclosure can be employed. It should be clearly understood that the principles of the present disclosure are in no way limited to any detail of the fan blade or any component of the fan blade shown in the drawings or described in this specification.

Wind Turbine Implementation

Based on the above description, the present disclosure further provides a wind power generator, wherein the wind power generator includes the fan blade proposed in the present disclosure and specifically described in the above implementation manners.

It should be noted at this point that the wind turbine shown in the drawings and described in this specification is but one example of many types of wind turbines with which the principles of the present disclosure can be employed. It should be clearly understood that the principles of the present disclosure are in no way limited to any detail of the wind turbine or any component of the wind turbine shown in the drawings or described in this specification.

Exemplary implementations of the blade body lightning protection device, the blade lightning protection system, the wind turbine blade and the wind power generator proposed in the present disclosure are described and/or illustrated in detail above. However, the embodiments of the present disclosure are not limited to the specific embodiments described herein, but rather, the components and/or steps of each embodiment can be used independently and separately from other components and/or steps described herein. Each component and/or each step of one embodiment may also be used in combination with other components and/or steps of other embodiments. In introducing elements/components/etc. described and/or illustrated herein, the terms "a", "an" and "aforementioned" etc. are used to mean that there are one or more elements/components/etc. The terms "comprising", "including" and "having" are used in an open inclusive sense and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc. In addition, the terms "first" and "second" in the claims and the specification are used only as signs and do not limit the number of objects.

Although the blade body lightning protection device, blade lightning protection system, fan blade and wind power generator proposed in the present disclosure have been described according to different specific embodiments, those skilled in the art will recognize that the invention can be implemented within the spirit and scope of the claims. Changes are made to the practice of this disclosure.

Claims (20)

1. A blade body lightning protection device, installed on the blade body position of the fan blade, the main conduction down conductor is provided in the fan blade, it is characterized in that, the blade body lightning protection device comprises: A plurality of blade body lightning receptors are arranged in multiple pairs, and multiple pairs of blade body lightning receptors are arranged on the blade body of the fan blade at intervals along the axial direction of the fan blade. The two blade air receptors of the same pair The body lightning receptors are respectively arranged on the windward side and the leeward side of the fan blades, and the blade body lightning receptors are exposed on the outer wall of the fan blades; A plurality of blade body air-termination bases are arranged on the inner wall of the fan blade and are respectively connected to a plurality of the blade body air-termination devices correspondingly; A plurality of blade air conduction down conductors are correspondingly connected between the plurality of blade body air-termination bases and the main conduction down conductor; and The insulating layer is arranged on the outer periphery of the airfoil lightning-termination base and the outer periphery of the airfoil conductive down conductor. 2. The airfoil lightning protection device according to claim 1, characterized in that two adjacent pairs of airfoil lightning receptors are arranged with a first interval in the axial direction of the fan blade; wherein, the same pair The two airfoil air receptors are arranged at a second interval in the axial direction of the fan blade, and the second interval is smaller than the first interval. 3. The blade body lightning protection device according to claim 1, wherein the blade body lightning receptor has a third end and a fourth end, and the third end is penetrated and exposed on the fan blade. The outer wall, the fourth end protrudes into the inner cavity of the fan blade and passes through the air-termination base of the blade body. 4. The airfoil lightning protection device according to claim 3, wherein the airfoil lightning-termination device is a bolt structure, the third end is a screw head, and the fourth end is a screw rod portion, so that The end surface of the screw head is provided with a notch, and the screw rod is screwed to the lightning-termination base of the blade body. 5. The lightning protection device for blade body according to claim 4, characterized in that, the screw head and the screw rod are in a split structure, and the screw head is detachably screwed to the screw rod One end of the screw part is provided with another notch. 6. The blade body lightning protection device according to claim 1, wherein the material of the blade body lightning receptor is a high temperature resistant material. 7. The blade body lightning protection device according to claim 1, characterized in that, the blade body lightning-termination base has a first part and a second part in an integrated structure, and the blade body lightning-termination device is connected to the The first part, the conductive down conductor of the blade body is connected to the second part; wherein, the projected size of the first part on the inner wall of the fan blade is larger than that of the second part on the fan blade The dimension of the projection on the inner wall of the blade. 8. The blade body lightning protection device according to claim 1, wherein the projection of the first part on the inner wall of the fan blade is circular, and the second part is on the inner wall of the fan blade The projection on is rectangular, and the outer diameter of the first part is larger than the width of the second part. 9. The blade body lightning protection device according to claim 1, characterized in that, the end of the blade body conductive down conductor connected to the blade body lightning-terminating base is provided with a second terminal, and the The second connecting terminal passes through the air-termination base of the blade body. 10. The blade body lightning protection device according to claim 9, characterized in that, the second connection terminal is provided with a screw thread, and is screwed and matched with the blade body lightning-termination base. 11. The blade body lightning protection device according to claim 1, characterized in that, the blade body lightning-termination base has opposite first and second surfaces, and the blade body lightning-termination base has its first surface connected to the inner wall of the fan blade; wherein, the thickness of the portion of the insulating layer disposed on the first surface is smaller than the thickness of the portion of the insulating layer disposed on the second surface. 12. The blade body lightning protection device according to claim 1, wherein the material of the insulating layer is injection molded elastic material or die-cast composite material. 13. The airfoil lightning protection device according to claim 1, characterized in that, the outer wall of the airfoil portion of the fan blade is provided with an insulating skin; and/or, the inner wall of the airfoil portion of the fan blade is provided with With insulating skin. 14. The blade body lightning protection device according to any one of claims 1 to 13, wherein the blade body lightning protection device further comprises: A plurality of airfoil wire brackets, fixed to the inner wall of the fan blade and respectively corresponding to the plurality of airfoil conduction down conductors, so that the blade air conduction down conductors are erected on the blade air line support . 15. The airfoil lightning protection device according to any one of claims 1 to 13, characterized in that, the airfoil lightning-termination base provided on the inner wall of the windward side of the fan blade and the inner wall of the leeward side are supported by a Base stand. 16. A blade lightning protection system installed on a fan blade, the blade lightning protection system includes a blade tip lightning protection device, a blade body lightning protection device and a main conductive down conductor, the blade tip lightning protection device and the The blade body lightning protection device is respectively arranged on the blade tip and the blade body part of the fan blade, and is respectively connected to the main conduction down conductor; it is characterized in that the blade body lightning protection device is one of claims 1-2. 15. The blade body lightning protection device described in any one of 15. 17. The blade lightning protection system according to claim 16, characterized in that, the end of the blade tip of the fan blade is open, and the blade tip lightning protection device comprises: The blade tip connector is arranged at the blade tip of the fan blade and includes a body part and two connecting parts, the connecting part is formed by extending from the body part to the end opening of the blade tip part, and the two The connecting parts are arranged oppositely at intervals and respectively correspond to the windward side and the leeward side of the fan blade; a blade tip conductive down conductor connected between the body portion of the blade tip connector and the main conductive down conductor; The blade-tip air-termination device is arranged at the end opening of the blade-tip part of the fan blade, and the blade-tip air-termination device includes two metal air-termination plates, the shapes of the two metal air-termination plates are respectively the same as those of the air-termination plates. The shapes of the windward side and the leeward side of the fan blade are matched to define the tip of the blade tip of the fan blade, and the two metal lightning receptors are detachably connected to the two blade tip connectors respectively. a said connecting portion; and The insulating layer is provided on the outer periphery of the body part of the blade tip connector and the outer periphery of the blade tip conductive down conductor. 18. The blade lightning protection system according to claim 16, wherein a web is provided in the inner cavity of the fan blade; wherein the main conductive down conductor is provided on the web. 19. A fan blade, comprising a blade body and a blade lightning protection system, the blade lightning protection system is installed in the blade body; it is characterized in that, the blade lightning protection system is as claimed in any one of claims 16-18 The blade lightning protection system described above. 20. A wind power generator, characterized in that the wind power generator comprises the fan blade according to claim 19.