Lightning protection device for wind turbine blades

Abstract

The embodiment of the present application provides a lightning protection device for a wind turbine blade, and relates to the technical field of lightning protection for wind turbines. The lightning protection device for a wind turbine blade includes a lightning protection ring, a lightning protection slider, and a sliding assembly. The lightning protection ring includes a lightning protection ring body and at least one extension portion arranged on the lightning protection ring body. The extension portion extends radially along the lightning protection ring body. The sliding assembly is slidably connected to the extension portion to form a preset interval with the lightning protection ring body. The lightning protection slider is connected to the sliding assembly and slidably abuts against the lightning protection ring body. When the lightning protection ring rotates with the wind turbine blade, the lightning protection slider slides relative to the lightning protection ring with the sliding assembly, and the lightning protection slider is grounded. The relative position relationship between the lightning protection slider and the lightning protection ring body is ensured to be stable through the preset interval, so that the continuity, stability and reliability of the contact between the lightning protection slider and the lightning protection ring are good, and the lightning protection effect of the lightning protection device is ensured to be stable and reliable.

Description

Technical Field

[0001] The present application relates to the technical field of lightning protection for wind turbines, and in particular to a lightning protection device for wind turbine blades. Background Art

[0002] In the field of wind power generation, the larger the blade length and blade root diameter of the wind turbine, the greater the overall height of the wind turbine, and the corresponding probability of being struck by lightning. For this reason, it is necessary to set up a high-reliability lightning protection device to effectively prevent lightning current from causing electromagnetic interference and other hazards to the electronic equipment inside the wind turbine.

[0003] In the prior art, the lightning protection device at the root of the blade usually includes a lightning protection ring sleeved on the root of the wind turbine blade, and a lightning protection slider connected to the lightning protection ring with low impedance. The lightning protection ring is also connected to the tip of the blade with low impedance to collect and conduct the lightning current to the lightning protection ring. The lightning protection slider is set at the hub of the blade of the wind turbine through an elastic plate. Under the extrusion of the elastic plate, the lightning protection slider is axially compensated to ensure that the lightning protection slider can be slidably connected to the lightning protection ring and reliably maintain a low impedance conductive connection. The lightning protection slider is also electrically connected to the ground so that the lightning current can be directed to the ground, reducing the damage to the blades caused by lightning.

[0004] However, as the blade length and root diameter increase, the blade is easy to deform, the root roundness becomes more uneven, and the elastic force of the elastic plate will decay over time, weakening the axial compensation effect on the lightning protection ring, ultimately leading to poor continuity of contact between the lightning protection slider and the lightning protection ring, and the stability and reliability of the lightning protection device are correspondingly reduced. Summary of the invention

[0005] The embodiment of the present application provides a lightning protection device for a wind turbine blade to solve the problem of poor continuity of contact between a lightning protection slider and a lightning protection ring of a lightning protection device of an existing wind turbine generator set.

[0006] The lightning protection device for wind turbine blades provided in the embodiment of the present application comprises a lightning protection ring, a lightning protection slider and a sliding assembly, wherein the lightning protection ring comprises a lightning protection ring body and at least one extension portion arranged on the lightning protection ring body, wherein the extension portion extends radially along the lightning protection ring body, the lightning protection ring body is used to be sleeved on the root of the wind turbine blade, the sliding assembly is slidably connected to the extension portion to form a preset interval with the lightning protection ring body, and the lightning protection slider is connected to the sliding assembly and slidably abuts against the lightning protection ring body;

[0007] When the lightning protection ring rotates with the wind turbine blades, the lightning protection slider slides relative to the lightning protection ring along with the sliding assembly, and the lightning protection slider is grounded, so that when the wind turbine blades are struck by lightning, the lightning current is guided to the ground through the lightning protection ring and the lightning protection slider in sequence.

[0008] In some possible implementations, the lightning protection device for wind turbine blades provided in the embodiments of the present application further includes at least one track groove, which is arranged on the extension portion and is coaxial with the lightning protection ring body. The track groove and the circumferential surface of the lightning protection ring body have a preset interval, and the sliding assembly is slidably connected to the track groove.

[0009] In some possible implementations, the lightning protection device for a wind turbine blade provided in the embodiment of the present application is provided with two extension parts, and the two extension parts are respectively provided at intervals along the axial direction of the lightning protection ring body;

[0010] The track groove and the extension parts are arranged correspondingly and are respectively located on one side opposite to the two extension parts. The sliding component is located between the two extension parts, and two sides of the sliding component are respectively connected to the track groove.

[0011] In some possible implementations, the lightning protection device for wind turbine blades provided in the embodiments of the present application, the sliding assembly includes an auxiliary connecting member, at least one pulley, at least one fixed connecting member and at least one fixed member, the pulley is slidably connected to the track groove, the fixed connecting member is arranged on the pulley and is connected to the auxiliary connecting member along the axial direction of the lightning protection ring, the fixed member is arranged on the auxiliary connecting member, and the fixed member is connected to the lightning protection slider.

[0012] In some possible implementations, the lightning protection device for wind turbine blades provided in the embodiments of the present application has at least two pulleys and at least two fixed connectors, at least two fixed connectors are respectively connected to opposite sides of the auxiliary connector, and at least two pulleys are respectively connected to the at least two fixed connectors to be slidably connected to the track groove from opposite sides of the auxiliary connector.

[0013] In some possible implementations, the lightning protection device for wind turbine blades provided in the embodiments of the present application further includes a grounding wire, which is passed through the auxiliary connecting piece and connected to the lightning protection slider to ground the lightning protection slider.

[0014] In some possible implementations, the lightning protection device for wind turbine blades provided in the embodiments of the present application, the lightning protection slider includes a brush, a first insulating elastic part and an insulating lubricating bushing, one side of the insulating lubricating bushing has a first opening, the first insulating elastic part is located in the insulating lubricating bushing, the brush is plugged into the insulating lubricating bushing through the first opening, and elastically abuts against the first insulating elastic part, and the brush slides against the lightning protection ring on one side facing the first opening and on the same side of the insulating lubricating bushing.

[0015] In some possible implementations, the lightning protection device for wind turbine blades provided in the embodiments of the present application, the lightning protection slider also includes an insulating shell and a second insulating elastic member, one side of the insulating shell has a second opening, the second insulating elastic member is located in the insulating shell and abuts against the insulating shell, and a portion of the insulating lubricating bushing on one side away from the first opening is plugged into the insulating shell through the second opening and elastically abuts against the second insulating elastic member.

[0016] In some possible implementations, the lightning protection device for wind turbine blades provided in the embodiments of the present application is provided with an observation window on the outer side of the insulating shell, the extension direction of the observation window is consistent with the plug-in direction of the insulating lubricating bushing, the size of the observation window along its own extension direction is larger than the size of the second insulating elastic part in this direction, and the observation window is provided with a scale along its own extension direction.

[0017] In some possible implementations, in the lightning protection device for wind turbine blades provided in the embodiments of the present application, the second insulating elastic member, the insulating lubricating bushing, the first insulating elastic member and the brush are coaxially arranged in sequence along the axial direction of the insulating housing;

[0018] Through holes are coaxially provided on the insulating shell, the second insulating elastic member, the insulating lubricating bushing and the first insulating elastic member. The through holes are sequentially connected to form a wiring channel, and the brush is grounded via the wiring channel.

[0019] The lightning protection device for wind turbine blades provided in the embodiment of the present application is provided with a lightning protection ring, a lightning protection slider and a sliding assembly. The lightning protection ring is provided with an extension portion extending radially along the main body of the lightning protection ring, so that the sliding assembly is slidably connected with the extension portion, and thereby a preset interval is formed between the main body of the lightning protection ring. Further, the lightning protection slider is connected with the sliding assembly, so that the lightning protection slider can slide relative to the lightning protection ring under the drive of the sliding assembly, and the lightning protection slider abuts against the main body of the lightning protection ring, ensuring that the lightning current can be guided from the lightning protection ring to the lightning protection slider. Since there is a preset interval between the sliding component and the lightning protection ring body, the lightning protection slider is set on the sliding component and abutted against the lightning protection ring body. The preset interval can ensure the stability of the relative position relationship between the lightning protection slider and the lightning protection ring body, avoid poor contact between the lightning protection slider and the lightning protection ring due to blade deformation and uneven roundness, and always ensure that the lightning protection slider can stably abut against the lightning protection ring body and will not excessively squeeze the lightning protection slider toward the lightning protection ring body, so that the continuity, stability and reliability of the contact between the lightning protection slider and the lightning protection ring are good, thereby ensuring that the lightning protection effect of the lightning protection device is stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0022] Figure 2 for Figure 1Schematic diagram of the structure of the middle sliding assembly and the lightning protection slider;

[0023] Figure 3 for Figure 1 A schematic diagram of the structure of the lightning protection device for wind turbine blades from another perspective;

[0024] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0025] Figure 5 for Figure 2 Schematic diagram of the explosion structure of the medium lightning protection slider.

[0026] Description of reference numerals:

[0027] 100-lightning protection ring; 110-lightning protection ring body; 120-extension portion; 120a-first extension portion; 120b-second extension portion; 130-track groove; 130a-first track groove; 130b-second track groove;

[0028] 200-lightning protection slider; 201-wiring channel; 210-brush; 220-first insulating elastic member; 230-insulating lubricating bushing; 231-first opening; 240-second insulating elastic member; 250-insulating housing; 251-observation window; 252-second opening;

[0029] 300-sliding assembly; 310-auxiliary connecting piece; 320-pulley; 321-rotating shaft; 330-fixed connecting piece; 340-fixed piece;

[0030] 400-Ground wire. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0032] As mentioned in the background technology, the lightning protection device at the root of the blade usually includes a lightning protection ring sleeved at the root of the wind turbine blade, and a lightning protection slider connected to the lightning protection ring with low impedance. The lightning protection ring is connected to the lightning receptor at the tip of the blade with low impedance through a down conductor, so that the lightning current is collected and conducted to the lightning protection ring through the lightning receptor. The lightning protection slider is arranged at the hub position of the wind turbine blade through an elastic plate, and the lightning protection slider is axially compensated under the extrusion of the elastic plate, so that the lightning protection slider is slidably connected to the lightning protection ring and reliably maintains a low impedance conductive connection. The lightning protection slider is also electrically connected to the ground through a grounding wire, so that the lightning current can be conducted to the ground, reducing the damage to the blades caused by lightning.

[0033] Among them, when the lightning protection slider is fully and reliably contacted under the squeezing action of the elastic plate, a safe current discharge channel can be formed.

[0034] However, compared with the blades of some small wind turbines, the blades of some large wind turbines are more easily deformed as the blade length and blade root diameter increase, and the blade root roundness is more uneven, which can easily cause the lightning protection slider and the lightning protection ring to be disconnected. In addition, the elastic force of the elastic plate will also decay over time and the frequent pitch change process of the blades, reducing the contact area between the lightning protection slider and the lightning protection ring. As the lightning protection slider wears, the axial compensation effect of the elastic plate on the lightning protection ring is weakened, resulting in worse continuity of contact between the lightning protection slider and the lightning protection ring.

[0035] When the lightning protection slider fails to stably contact with the lightning protection ring, such as frequent disconnection or complete loss of contact, the current discharge channel will be interrupted at this point, causing the lightning protection device to fail, and the stability and reliability of the lightning protection device will be reduced accordingly.

[0036] Based on the technical problem of poor continuity of contact between the lightning protection slider and the lightning protection ring, the embodiment of the present application provides a lightning protection device for wind turbine blades, which is provided with a lightning protection ring, a lightning protection slider and a sliding assembly, so that the sliding assembly is slidably connected with the extension portion on the lightning protection ring, thereby forming a preset interval with the main body of the lightning protection ring, and the lightning protection slider is connected to the sliding assembly and abuts against the main body of the lightning protection ring. The preset interval can ensure that the relative position relationship between the lightning protection slider and the main body of the lightning protection ring is stable, and always ensure that the lightning protection slider can stably abut against the main body of the lightning protection ring without contact, so that the continuity, stability and reliability of the contact between the lightning protection slider and the lightning protection ring are better.

[0037] The contents of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings so that those skilled in the art can understand the contents of the present invention more clearly and in detail.

[0038] Reference Figures 1 to 4As shown, the lightning protection device for wind turbine blades provided in the embodiment of the present application includes a lightning protection ring 100, a lightning protection slider 200 and a sliding assembly 300. The lightning protection ring 100 includes a lightning protection ring body 110 and at least one extension 120 arranged on the lightning protection ring body 110. The extension 120 extends radially along the lightning protection ring body 110. The lightning protection ring body 110 is used to be sleeved on the root of the wind turbine blade. The sliding assembly 300 is slidably connected to the extension 120 to form a preset interval with the lightning protection ring body 110. The lightning protection slider 200 is connected to the sliding assembly 300 and slidably abuts against the lightning protection ring body 110.

[0039] When the lightning protection ring 100 rotates with the wind turbine blades, the lightning protection slider 200 slides relative to the lightning protection ring 100 along with the sliding assembly 300. The lightning protection slider 200 is grounded so that when the wind turbine blades are struck by lightning, the lightning current is guided to the ground through the lightning protection ring 100 and the lightning protection slider 200 in sequence.

[0040] Among them, when the lightning protection ring 100 is specifically set, it is sleeved on the end of the wind turbine blade close to the wind turbine hub, that is, it is sleeved on the root of the blade, and a lightning receptor is set on the tip of the blade (the end of the blade away from the wind turbine hub). The lightning receptor can be used to guide and concentrate lightning to replace the tip of the blade to receive lightning strikes. The lightning receptor is connected to the lightning protection ring 100 through a down conductor, so that the current on the lightning receptor can be conducted to the lightning protection ring 100 through the down conductor to prevent the lightning current from flowing directly through the blade. Specifically, the down conductor can be set to be conductively connected to the main body 110 of the lightning protection ring, rather than connected to the extension 120 on the lightning protection ring 100, so as to shorten the current path.

[0041] The lightning protection ring body 110 is sleeved along the extension direction of the blade, and the axial direction of the lightning protection ring body 110 is consistent with the extension direction of the blade. The outer side of the lightning protection ring body 110 is provided with an extension part 120 along the radial direction of the lightning protection ring body 110, and the extension part 120 extends to the outer side of the lightning protection ring 100. The sliding assembly 300 is slidably connected with the extension part 120, so that a preset interval can be provided between the sliding assembly 300 and the outer peripheral surface of the lightning protection ring body 110. It should be noted that since the sliding assembly 300 is slidably connected with the lightning protection ring body 110, the preset interval is always maintained between the two during relative sliding, that is, the sliding assembly 300 slides along the same circumference of the lightning protection ring body 110. When the lightning protection ring body 110 has poor roundness due to the processing error of its own roundness, the processing error of the blade roundness or the deformation of the blade, the extension part 120 will change synchronously with the lightning protection ring body 110, so that the sliding assembly 300 can always be guaranteed to be at the preset interval with the lightning protection ring body 110.

[0042] The lightning protection slider 200 is arranged on the sliding assembly 300, and is slidably abutted against the outer peripheral surface of the lightning protection ring body 110 under the support of the sliding assembly 300, and is electrically connected to the lightning protection ring 100 through the lightning protection slider 200, so that when the blade rotates relative to the wind turbine pitch, it can always be in stable contact with the lightning protection ring 100. The lightning protection slider 200 is further connected to the ground through the grounding wire 400, so that when current passes through the lightning protection ring 100, the current can be further efficiently and safely guided to the ground through the lightning protection slider 200 and the grounding wire 400, so as to reduce the damage of lightning to the blades of the wind turbine.

[0043] Therefore, the lightning protection device for wind turbine blades provided in the embodiment of the present application is provided with a lightning protection ring 100, a lightning protection slider 200 and a sliding assembly 300. The lightning protection ring 100 is provided with an extension portion 120 extending radially along the lightning protection ring body 110, so that the sliding assembly 300 is slidably connected with the extension portion 120, and thereby forms a preset interval with the lightning protection ring body 110. Further connecting the lightning protection slider 200 with the sliding assembly 300, the lightning protection slider 200 can slide relative to the lightning protection ring 100 under the drive of the sliding assembly 300, and the lightning protection slider 200 abuts against the lightning protection ring body 110, ensuring that the lightning current can be guided from the lightning protection ring 100 to the lightning protection slider 200.

[0044] Since there is a preset interval between the sliding component 300 and the lightning protection ring body 110, the lightning protection slider 200 is set on the sliding component 300, rigidly connected to the sliding component 300, and abutted against the lightning protection ring body 110. The preset interval can ensure that the relative position relationship between the lightning protection slider 200 and the lightning protection ring body 110 is stable, and poor contact between the lightning protection slider 200 and the lightning protection ring 100 caused by blade deformation and uneven roundness is avoided. It is ensured that the lightning protection slider 200 can always stably abut against the lightning protection ring body 110 without continuous contact, and will not excessively squeeze the lightning protection slider 200 toward the lightning protection ring body 110, so that the continuity, stability and reliability of the contact between the lightning protection slider 200 and the lightning protection ring 100 are good, thereby ensuring that the lightning protection effect of the lightning protection device is stable and reliable.

[0045] Furthermore, since the lightning protection slider 200 is in contact with the lightning protection ring 100 through the sliding assembly 300, and the sliding assembly 300 is arranged on the lightning protection ring 100, the lightning protection device for the wind turbine blade provided by the present application can be regarded as being arranged at the blade root of the wind turbine as a whole. Compared with the prior art in which the lightning protection ring 100 is sleeved at the blade root of the wind turbine, and the lightning protection slider 200 is arranged at the hub of the wind turbine through connectors such as elastic plates, the lightning protection slider 200 and its supporting structure (i.e., the sliding assembly 300) in the lightning protection device for the wind turbine blade provided by the present application occupy a smaller space, and are more compact with the lightning protection ring 100, thereby reducing the possibility of the lightning protection device for the wind turbine blade being disconnected due to external collision, and making the lightning protection device for the wind turbine blade more stable and reliable.

[0046] In some embodiments, reference Figure 1 , Figure 3 and Figure 4 As shown, the lightning protection device for wind turbine blades provided in the embodiment of the present application also includes at least one track groove 130, which is arranged on the extension portion 120 and is coaxial with the lightning protection ring body 110. The track groove 130 and the circumferential surface of the lightning protection ring body 110 have a preset interval, and the sliding assembly 300 is slidably connected to the track groove 130.

[0047] It can be understood that, by providing a track groove 130 coaxial with the lightning protection ring body 110 on the extension portion 120, the track groove 130 is annular, so as to form the preset interval between the track groove 130 and the circumferential surface of the lightning protection ring body 110. In this way, the sliding assembly 300 is slidably connected to the track groove 130, and the sliding assembly 300 can be slidably connected along the track groove 130, so as to control the sliding assembly 300 and the lightning protection ring body 110 to maintain a stable relative distance through the preset interval between the track groove 130 and the lightning protection ring body 110, thereby forming a preset interval between the sliding assembly 300 and the outer peripheral surface of the lightning protection ring body 110.

[0048] Furthermore, since the lightning protection slider 200 is arranged on the sliding assembly 300 and slides against the lightning protection ring body 110, the relative position relationship between the lightning protection slider 200 and the lightning protection ring body 110 can be guaranteed, so that the lightning protection slider 200 and the lightning protection ring body 110 can slide against each other stably and continuously.

[0049] Specifically, refer to Figure 1 and Figure 4 As shown, two extension parts 120 are provided, and the two extension parts 120 are respectively arranged along the axial direction of the lightning protection ring body 110 at intervals;

[0050] The track groove 130 and the extension part 120 are provided correspondingly and are respectively located at opposite sides of the two extension parts 120 . The sliding assembly 300 is located between the two extension parts 120 , and both sides of the sliding assembly 300 are respectively connected to the track groove 130 .

[0051] Two extension parts 120 are provided, namely, a first extension part 120a and a second extension part 120b, and the first extension part 120a and the second extension part 120b have the same radial and axial dimensions in the lightning protection ring 100. The first extension part 120a and the second extension part 120b are respectively arranged at intervals along the axial direction of the lightning protection ring body 110. In this embodiment, the first extension part 120a and the second extension part 120b are respectively located at the axial ends of the lightning protection ring body 110, and are transitionally connected with the end of the lightning protection ring body 110, so as to make the structure of the lightning protection ring 100 more compact. In other embodiments, the first extension part 120a and the second extension part 120b can also be arranged at intervals along the axial direction of the lightning protection ring body 110 at any position of the lightning protection ring body 110, for example, the first extension part 120a and the second extension part 120b are arranged at intervals at a certain end or middle section of the lightning protection ring body 110, and the specific interval can be set according to the axial dimension of the sliding assembly 300 in the lightning protection ring body 110, so as to be connected with the sliding assembly 300.

[0052] The first extension part 120a and the second extension part 120b can be integrally formed with the lightning protection ring body 110, or the first extension part 120a and the second extension part 120b can be separately processed and sleeved on the lightning protection ring body 110, and can be insulating parts to prevent current from passing through the sliding assembly 300, which is not limited in the present application.

[0053] The track groove 130 provided on the first extension portion 120a is a first track groove 130a, and the track groove 130 provided on the second extension portion 120b is a second track groove 130b. The first track groove 130a is provided on a side of the first extension portion 120a facing the second extension portion 120b, and the second track groove 130b is provided on a side of the second extension portion 120b facing the first extension portion 120a. The first track and the second track are provided opposite to each other so as to be connected with the sliding assembly 300.

[0054] In this embodiment, the preset interval between the first track groove 130a and the second track groove 130b and the circumferential surface of the lightning protection ring body 110 is consistent, that is, the annular diameters of the first track groove 130a and the second track groove 130b are consistent, so that the sliding assembly 300 can be parallel to the axial direction of the lightning protection ring body 110, so that the sliding assembly 300 relative to the lightning protection ring body 110 is relatively stable. In other embodiments, the preset intervals between the first track groove 130a and the second track groove 130b and the lightning protection ring body 110 can also be inconsistent, so that the annular diameter of one is larger and the annular diameter of the other is smaller, so that the sliding assembly 300 is tilted relative to the axial direction of the lightning protection ring body 110, and it is only necessary to ensure that the lightning protection slider 200 can stably slide and abut against the circumferential surface of the lightning protection ring body 110, and this application does not limit this.

[0055] In specific implementation, the first track groove 130a and the second track groove 130b are respectively located at the edges of the first extension part 120a and the second extension part 120b, and are transitionally connected with the first extension part 120a and the second extension part 120b, further making the overall structure of the lightning protection ring 100 compact. In other embodiments, the first track groove 130a and the second track groove 130b can also be respectively set at the middle position of the first extension part 120a and the second extension part 120b, so that the first extension part 120a and the second extension part 120b form protection for the sliding assembly 300 therebetween, ensuring the structural stability of the sliding assembly 300.

[0056] In some embodiments, reference Figure 2 and Figure 4 As shown, the sliding assembly 300 includes an auxiliary connecting member 310, at least one pulley 320, at least one fixed connecting member 330 and at least one fixing member 340. The pulley 320 is slidably connected to the track groove 130. The fixed connecting member 330 is arranged on the pulley 320 and is connected to the auxiliary connecting member 310 along the axial direction of the lightning protection ring 100. The fixing member 340 is arranged on the auxiliary connecting member 310, and the fixing member 34 is connected to the lightning protection slider 200.

[0057] The pulley 320 is slidably connected to the track groove 130, and is partially located in the track groove 130. Specifically, when the lightning protection ring 100 rotates driven by the wind turbine blades, the pulley 320 can slide or roll relative to the track groove 130. A rotating shaft 321 is rotatably provided on the central axis of the pulley 320, and the rotating shaft 321 is connected to a fixed connector 330, so that the pulley 320 can slide or roll relative to the track groove 130 around its own central axis.

[0058] The extension direction of the fixed connector 330 is consistent with the axial direction of the lightning protection ring 100 to form a preset interval with the lightning protection ring body 110. One end of the fixed connector 330 is connected to the pulley 320, and the other end is connected to the auxiliary connector 310. The lightning protection slider 200 is set at one end of the auxiliary connector 310 to achieve the connection between the lightning protection slider 200 and the sliding assembly 300, and the auxiliary connector 310 is used to compensate for the preset interval between the circumferential surface of the fixed connector 330 and the lightning protection ring body 110, so that the lightning protection slider 200 can smoothly abut against the lightning protection ring body 110.

[0059] In a specific implementation, a connection groove is provided on one side of the extension direction of the auxiliary connector 310, or a connection hole with a positioning groove is provided, and a connection protrusion is provided at the end of the fixed connector 330, and the connection protrusion can be positioned and plugged with the connection groove or the connection hole to achieve fixation, so as to ensure that the fixed connector 330 and the pulley 320 are respectively arranged corresponding to the first track and the second track. In addition, it should be noted that the depth of the connection groove or the connection hole should be compatible with the size of the pulley 320, the fixed connector 330 and the track groove 130, so that the pulley 320 can slide stably and smoothly in the track groove 130, and will neither fall out of the track groove 130 due to poor contact, nor slide and get stuck due to excessive abutment.

[0060] Alternatively, the fixed connector 330 and the auxiliary connector 310 may be connected by bolts, welding, riveting, clamping, etc. The present application does not limit the connection form between the auxiliary connector 310 and the fixed connector 330 .

[0061] Exemplarily, the fixing member 340 is L-shaped, and at least one bolt hole is opened on both ends thereof. The first section is bolted to the fixing member 330 through the bolt hole thereon, and the second section is bolted to the lightning protection slider 200 through the bolt hole.

[0062] Further, see Figure 2 and Figure 4 As shown, at least two pulleys 320 and fixed connectors 330 are provided, and at least two fixed connectors 330 are respectively connected to the opposite sides of the auxiliary connector 310, and at least two pulleys 320 are respectively connected to the at least two fixed connectors 330 to be slidably connected to the track groove 130 from the opposite sides of the auxiliary connector 310.

[0063] It can be understood that more than two pulleys 320 and fixed connectors 330 are provided to be correspondingly connected to the opposite sides of the auxiliary connector 310, so as to facilitate the sliding connection between the pulley 320 and the first track groove 130a on the first extension portion 120a and the second track groove 130b on the second extension portion 120b, and prevent the pulley 320 from slipping out of the first track groove 130a or the second track groove 130b due to lack of limiting, so that the pulley 320 can stably drive the fixed connector 330 and the auxiliary connector 310 to slide along the track groove 130, thereby ensuring stable contact between the lightning protection slider 200 and the lightning protection ring 100.

[0064] In the specific implementation, a rigid connection method is adopted between the pulley 320, the fixed connection member 330, and the auxiliary connection member 310, so that the sliding assembly 300 is rigid as a whole, ensuring that a stable axial and radial support effect is provided for the lightning protection slider 200, so that the relative sliding of the lightning protection slider 200 and the lightning protection ring 100 is stable and reliable.

[0065] In other embodiments, multiple fixed connectors 330 can be connected to the auxiliary connector 310, and a pulley 320 can be set on each fixed connector 330. One of the multiple fixed connectors 330 can also be used as a main rod, and the other fixed connectors 330 are set on the main rod to form branches, and corresponding pulleys 320 are set on the main rod and the branches. The present application does not impose any restrictions on this.

[0066] Alternatively, an additional supporting structure may be provided to support the sliding assembly 300 to ensure that the sliding assembly 300 can stably slide in the track groove 130 . The present application does not limit the specific supporting stabilization form of the sliding assembly 300 .

[0067] In addition, two fixing members 340 are also provided, and the two fixing members 340 are respectively connected to the lightning protection slider 200 from opposite sides of the auxiliary connecting member 310 .

[0068] In addition, refer to Figures 1 to 4 As shown, the lightning protection device for wind turbine blades provided in the embodiment of the present application further includes a grounding wire 400 , which is passed through the auxiliary connecting member 310 and connected to the lightning protection slider 200 to ground the lightning protection slider 200 .

[0069] It can be understood that by setting the grounding wire 400, the lightning protection slider 200 is grounded through the grounding wire 400, so that the lightning protection slider 200 can guide the current to the ground through the grounding wire 400. The auxiliary connector 310 can be a pipe, or a wiring groove is opened inside or on one side thereof to install the grounding wire 400, so that the grounding wire 400 is connected to the lightning protection slider 200 through the auxiliary connector 310. The auxiliary connector 310 can be used to guide and limit the direction of the grounding wire 400 to avoid interference between the grounding wire 400 and the sliding assembly 300, so that the lightning protection device of the wind turbine blade is more stable and reliable.

[0070] For this purpose, the auxiliary connecting member 310 can be set as a rigid metal pipe and connected to the lightning protection slider 200 by threaded connection or other fixed connection forms, so as to keep the grounding wire 400 and the lightning protection slider 200 relatively stable.

[0071] In some embodiments, reference Figures 1 to 5 As shown, the lightning protection slider 200 includes a brush 210, a first insulating elastic member 220 and an insulating lubricating bushing 230. One side of the insulating lubricating bushing 230 has a first opening 231. The first insulating elastic member 220 is located in the insulating lubricating bushing 230. The brush 210 is plugged into the insulating lubricating bushing 230 through the first opening 231 and elastically abuts against the first insulating elastic member 220. The side of the brush 210 facing the first opening 231 and the same side of the insulating lubricating bushing 230 are both in sliding abutment with the lightning protection ring 100.

[0072] In this way, the insulating lubricating bushing 230 has a side with a first opening 231 facing the axial surface of the lightning protection ring 100, the side of the insulating lubricating bushing 230 away from the first opening 231 is connected to the auxiliary connector 310, the first insulating elastic member 220 is arranged in the insulating lubricating bushing 230, and the brush 210 is elastically abutted against the first insulating elastic member 220 through the first opening 231. In this way, the elasticity of the first insulating elastic member 220 can be used to provide the brush 210 with a supporting force toward the circumferential surface of the lightning protection ring 100, and when the brush 210 is worn, the brush 210 can be pushed by the elasticity of the first insulating elastic member 220 to compensate for the worn part of the brush 210, so as to ensure that the brush 210 can be continuously and stably abutted against the lightning protection ring 100.

[0073] In the specific implementation, in order to ensure the structural stability of the brush 210, the circumference of the brush 210 can be wrapped by the insulating lubricating bushing 230, and only the side abutting against the lightning protection ring 100 is flush with the first opening 231, that is, the insulating lubricating bushing 230 can abut the brush 210 and the lightning protection ring 100 at the same time, so that the insulating lubricating bushing 230 lubricates the contact surface between the brush 210 and the lightning protection ring body 110. Since the hardness of the insulating lubricating bushing 230 is usually greater than the hardness of the brush 210, the wear speed of the brush 210 is faster than the wear speed of the insulating lubricating bushing 230. By applying a supporting force to the brush 210 through the first insulating elastic member 220, there is no need to worry that the brush 210 wears faster than the insulating lubricating bushing 230, so that the brush 210 is disconnected in the insulating lubricating bushing 230. Furthermore, the brush 210 and the first insulating elastic member 220 may abut against the inner side wall of the insulating lubricating bushing 230 in the circumferential direction, so that the first insulating elastic member 220 and the brush 210 are more stable.

[0074] The brush 210 is usually a carbon brush, which has a long service life, a low hardness and will not wear the lightning protection ring 100, and will not overheat during operation and has low noise.

[0075] In addition, refer to Figures 1 to 5 As shown, the lightning protection slider 200 also includes an insulating shell 250 and a second insulating elastic member 240. One side of the insulating shell 250 has a second opening 252. The second insulating elastic member 240 is located in the insulating shell 250 and abuts against the insulating shell 250. A side portion of the insulating lubricating bushing 230 away from the first opening 231 is plugged into the insulating shell 250 through the second opening 252 and elastically abuts against the second insulating elastic member 240.

[0076] It can be understood that in actual use, it is necessary to avoid the situation where only the brush 210 abuts against the lightning protection ring body 110 while the insulating lubricating bushing 230 is in full contact with the lightning protection ring body 110, so as to prevent the brush 210 from lacking lubrication when in contact with the lightning protection ring body 110. Therefore, an insulating shell 250 and a second insulating elastic member 240 can be provided, so that the second insulating elastic member 240 is elastically abutted against the side of the insulating lubricating bushing 230 away from the first opening 231 in the insulating shell 250, so as to provide the insulating lubricating bushing 230 with a supporting force toward the lightning protection ring body 110 through the second opening 252 through the second insulating elastic member 240, so that the insulating lubricating bushing 230 can also stably abut against the lightning protection ring body 110. Similarly, the insulating lubricating bushing 230 and the second insulating elastic member 240 can both abut against the inner side wall of the circumferential direction of the insulating shell 250, so that the insulating lubricating bushing 230 and the second insulating elastic member 240 remain stable.

[0077] Among them, the insulating lubricating bushing 230 and the insulating shell 250 can be modified polytetrafluoroethylene parts, and suitable fillers or copolymers can be added thereto, so that the insulating lubricating bushing 230 and the insulating shell 250 can have higher wear resistance, lubrication properties, insulation and supporting capabilities.

[0078] Furthermore, the first insulating elastic member 220 and the second insulating elastic member 240 may be rubber blocks, so that the first insulating elastic member 220 and the second insulating elastic member 240 have good elasticity and insulation. The rubber block has a low cost, and when its elasticity decays, it can also be replaced together with the brush 210, so as to reduce the inspection and maintenance cost of the lightning protection device of the wind turbine blade.

[0079] Further, in some embodiments, referring to Figure 2 and Figure 5 As shown, an observation window 251 is provided on the outer side of the insulating shell 250, and the extension direction of the observation window 251 is consistent with the plug-in direction of the insulating lubricating bushing 230. The size of the observation window 251 along its own extension direction is larger than the size of the second insulating elastic member 240 in this direction, and a scale is provided on the observation window 251 along its own extension direction.

[0080] Since the brush 210 is worn during use, when the brush 210 is worn to a certain extent, it may cause the lightning protection device of the fan blade to fail. The brush 210 is inserted in the insulating lubricating bushing 230 as a whole, and the insulating lubricating bushing 230 is inserted in the insulating housing 250, which is not convenient to remove the lightning protection slider 200 at any time to observe the wear degree of the brush 210. Therefore, an observation window 251 can be set on the outside of the insulating housing 250, and the size change of the second insulating elastic member 240 can be observed through the observation window 251. Because the size change of the second insulating elastic member 240 in this direction corresponds to the wear of the insulating lubricating bushing 230, and the wear of the insulating lubricating bushing 230 is related to the wear of the brush 210, the wear of the brush 210 can be understood, so that the wear of the brush 210 can be intuitively understood without disassembling the lightning protection slider 200, and it can be inspected and maintained to ensure the reliability of the lightning protection device of the fan blade.

[0081] In addition, refer to Figure 4 and Figure 5 As shown, the second insulating elastic member 240, the insulating lubricating bushing 230, the first insulating elastic member 220 and the brush 210 are coaxially arranged in sequence along the axial direction of the insulating housing 250;

[0082] The insulating housing 250 , the second insulating elastic member 240 , the insulating lubricating bushing 230 and the first insulating elastic member 220 are coaxially provided with through holes, which are sequentially connected to form a wiring channel 201 , through which the brush 210 is grounded.

[0083] In a specific implementation, the insulating lubricating bushing 230 and the insulating housing 250 can both be hollow cylindrical structures, with one end opening serving as the first opening 231 and the second opening 252. The first insulating elastic member 220, the second insulating elastic member 240 and the brush 210 can also be cylindrical, so that the lightning protection slider 200 is formed by coaxial nesting of multiple cylindrical structures, and the structure is relatively simple and compact. In other embodiments, the insulating housing 250, the second insulating elastic member 240, the insulating lubricating bushing 230, the first insulating elastic member 220 and the brush 210 can also be set to a rectangular columnar structure or other structures, and the present application does not limit this, but it should be noted that the centers of the extension directions of the above-mentioned components coincide.

[0084] For this purpose, a coaxially connected through hole can be opened on the insulating shell 250, the second insulating elastic member 240, the insulating lubricating bushing 230 and the first insulating elastic member 220. The through hole can be set at the center or one side of the insulating shell 250, the second insulating elastic member 240, the insulating lubricating bushing 230 and the first insulating elastic member 220 to form a wiring channel 201. The grounding wire 400 is connected to the brush 210 through the wiring channel 201 to facilitate grounding of the brush 210.

[0085] The insulating housing 250 is provided with a threaded hole, so that the auxiliary connector 310 can be threadedly connected to the insulating housing 250 through the fixing member 340, and the grounding wire 400 is inserted into the auxiliary connector 310 and the wiring channel 201. The grounding wire 400 is sequentially inserted into the auxiliary connector 310 and the wiring channel 201, which can avoid the grounding wire 400 from twisting and winding, and improve the reliability of the grounding wire 400. In order to make the force of the sliding assembly 300 and the lightning protection slider 200 more stable, the wiring channel 201 can be set at the center of the lightning protection slider 200, so that the auxiliary connector 310 is coaxially connected with the lightning protection slider 200.

[0086] It should be noted that the phrases "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0087] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.

[0088] It should be easily understood that “on,” “above,” and “over” in this application should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above something” or “over,” but also may include the meaning of “above something” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0089] In addition, spatially relative terms, such as "below," "below," "below," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90° or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lightning protection device for a wind turbine blade, characterized in that: The invention comprises a lightning protection ring (100), a lightning protection slider (200) and a sliding assembly (300), wherein the lightning protection ring (100) comprises a lightning protection ring body (110) and at least one extension portion (120) arranged on the lightning protection ring body (110), wherein the extension portion (120) extends in a radial direction of the lightning protection ring body (110), and the lightning protection ring body (110) is used to be sleeved on the root of a wind turbine blade, the sliding assembly (300) is slidably connected to the extension portion (120) to form a preset interval with the lightning protection ring body (110), and the lightning protection slider (200) is connected to the sliding assembly (300) and slidably abuts against the lightning protection ring body (110); When the lightning protection ring (100) rotates with the wind turbine blade, the lightning protection slider (200) slides relative to the lightning protection ring (100) along with the sliding assembly (300), and the lightning protection slider (200) is grounded, so that when the wind turbine blade is struck by lightning, the lightning current is guided to the ground in sequence through the lightning protection ring (100) and the lightning protection slider (200); The lightning protection slider (200) comprises a brush (210), a first insulating elastic member (220) and an insulating lubricating bushing (230); one side of the insulating lubricating bushing (230) has a first opening (231); the first insulating elastic member (220) is located in the insulating lubricating bushing (230); the brush (210) is plugged into the insulating lubricating bushing (230) through the first opening (231) and elastically abuts against the first insulating elastic member (220); the side of the brush (210) facing the first opening (231) and the same side of the insulating lubricating bushing (230) are both in sliding abutment with the lightning protection ring (100).

2. The lightning protection device for wind turbine blades according to claim 1, characterized in that: It also includes at least one track groove (130), which is arranged on the extension part (120) and is coaxial with the lightning protection ring body (110), and the track groove (130) and the circumferential surface of the lightning protection ring body (110) have the preset interval, and the sliding assembly (300) is slidably connected to the track groove (130).

3. The lightning protection device for wind turbine blades according to claim 2, characterized in that: Two extension portions (120) are provided, and the two extension portions (120) are respectively arranged at intervals along the axial direction of the lightning protection ring body (110); The track groove (130) and the extension part (120) are arranged correspondingly and are respectively located on opposite sides of the two extension parts (120); the sliding component (300) is located between the two extension parts (120); and two sides of the sliding component (300) are respectively connected to the track groove (130).

4. The lightning protection device for wind turbine blades according to claim 2 or 3, characterized in that: The sliding assembly (300) comprises an auxiliary connecting member (310), at least one pulley (320), at least one fixed connecting member (330) and at least one fixed member (340); the pulley (320) is slidably connected to the track groove (130); the fixed connecting member (330) is arranged on the pulley (320) and is connected to the auxiliary connecting member (310) along the axial direction of the lightning protection ring (100); the fixed member (340) is arranged on the auxiliary connecting member (310) and is connected to the lightning protection slider (200).

5. The lightning protection device for wind turbine blades according to claim 4, characterized in that: At least two of the pulleys (320) and the fixed connecting members (330) are provided, and at least two of the fixed connecting members (330) are respectively connected to opposite sides of the auxiliary connecting member (310), and at least two of the pulleys (320) are respectively connected to correspondingly at least two of the fixed connecting members (330) so as to be slidably connected to the track groove (130) from opposite sides of the auxiliary connecting member (310).

6. The lightning protection device for wind turbine blades according to claim 4, characterized in that: It also includes a grounding wire (400), the grounding wire (400) being passed through the auxiliary connecting piece (310) and connected to the lightning protection slider (200) so as to ground the lightning protection slider (200).

7. The lightning protection device for wind turbine blades according to any one of claims 1 to 3, characterized in that: The lightning protection slider (200) further comprises an insulating shell (250) and a second insulating elastic member (240); one side of the insulating shell (250) has a second opening (252); the second insulating elastic member (240) is located in the insulating shell (250) and abuts against the insulating shell (250); a side portion of the insulating lubricating bushing (230) away from the first opening (231) is plugged into the insulating shell (250) via the second opening (252) and elastically abuts against the second insulating elastic member (240).

8. The lightning protection device for wind turbine blades according to claim 7, characterized in that: An observation window (251) is provided on the outside of the insulating housing (250); the extension direction of the observation window (251) is consistent with the plugging direction of the insulating lubricating bushing (230); the size of the observation window (251) along its own extension direction is greater than the size of the second insulating elastic member (240) in this direction; and the observation window (251) is provided with scales along its own extension direction.

9. The lightning protection device for wind turbine blades according to claim 7, characterized in that: The second insulating elastic member (240), the insulating lubricating bushing (230), the first insulating elastic member (220) and the brush (210) are coaxially arranged in sequence along the axial direction of the insulating housing (250); The insulating housing (250), the second insulating elastic member (240), the insulating lubricating bushing (230) and the first insulating elastic member (220) are coaxially provided with through holes, and the through holes are sequentially connected to form a wiring channel (201), and the brush (210) is grounded via the wiring channel (201).

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