Lightning protection device of wind generating set

Abstract

The invention relates to the technical field of wind generating sets, and provides a wind generating set lightning protection device which comprises a blade, a main shaft, a tower drum and a lightning rod, the lightning rod is embedded along the surface of the blade and extends from the front end to the tail end of the blade, and the tail end of the blade is provided with a diversion contact connected with the lightning rod; the conducting ring is arranged outside the cabin, and the flow guide contact is in sliding contact with the end face of one side of the conducting ring; the grounding down lead is arranged outside the tower drum and is connected to the ground along the surface of the tower drum, and the upper end of the grounding down lead is in contact with the conducting ring; the liquid receiving disc and the water storage cabin are arranged outside the tower drum, and the liquid receiving disc is arranged at the top of the water storage cabin and communicated with the water storage cabin; the tower drum is provided with a water pumping pipe communicated with the water storage cabin, the water pumping pipe is connected with a water storage bag, and the water storage bag is provided with a water spraying pipe; the main shaft is provided with a cam structure corresponding to the blades, and the cam structure is connected with an extrusion assembly in a matched mode. In the thunder weather, the equipment for spraying water to cool the blade is triggered, so that the blade is effectively prevented from being too high in temperature or on fire.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine generator sets, and in particular to a lightning protection device for a wind turbine generator set. Background Art

[0002] With the increase of wind turbine capacity and rotor diameter, the height of wind turbines from the ground is also increasing. So far, the height of new wind turbines has reached or even exceeded 160 meters. Since wind turbines are usually installed in high-altitude areas or coastal areas where lightning is frequent, wind turbines are particularly protruding objects in these areas and are easily struck by lightning. In order to prevent wind turbines from being damaged by lightning, lightning protection devices are usually required for wind turbines.

[0003] The blades are at the highest position of the wind turbine, so lightning is easy to strike the blades. Although the blades are equipped with lightning protection devices, the instantaneous high current makes the blades very easy to generate high temperatures or even catch fire, which has an adverse effect on the normal power generation of the wind turbine. In thunderous weather, the same blade may be struck by lightning multiple times, resulting in excessive local temperature. Therefore, a lightning protection device is designed to protect and cool the blades after they are struck by lightning. Summary of the invention

[0004] The purpose of the present invention is to provide a lightning protection device for a wind turbine generator set, which can spray and cool blades to protect the blades.

[0005] The present invention is realized by the following technical scheme: a lightning protection device for a wind turbine generator, comprising blades, a main shaft and a tower, comprising a lightning rod, which is embedded and installed along the surface of the blade and extends from the front end to the rear end thereof, and the rear end of the blade is provided with a guide contact connected to the lightning rod; a conductive ring, which is arranged outside the nacelle, and the guide contact is in sliding contact with one side end face of the conductive ring; a grounding down conductor, which is arranged outside the tower and connected to the ground along its surface, and the upper end of the grounding down conductor is in contact with the conductive ring; a liquid receiving tray and a water storage tank, which are arranged outside the tower, and the liquid receiving tray is arranged on the top of the water storage tank and communicated with it; a water pumping pipe communicated with the water storage tank is arranged in the tower, the water pumping pipe is connected with a water storage bag, and a water spraying pipe is arranged at the upper end of the water storage bag; a cam structure corresponding to the blade is installed on the main shaft, and the cam structure is matched with an extrusion assembly, and the extrusion assembly is driven by the rotation of the main shaft to press the water storage bag to spray water.

[0006] Furthermore, the extrusion assembly includes a force transmission rod, a mounting plate and a spring. The mounting plate is mounted in the tower, the force transmission rod passes through the mounting plate and is slidably connected thereto, a pressure plate is fixedly connected to the middle part of the force transmission rod, the spring is sleeved on the force transmission rod, and the spring abuts between the pressure plate and the mounting plate, and the top end of the force transmission rod abuts against the cam structure.

[0007] Furthermore, the force transmission rod includes a first rod and a second rod, the first rod is rotatably connected to the second rod, and the pressure plate is arranged on the second rod.

[0008] Furthermore, an electromagnetic attractor is placed on the mounting plate, and the electromagnetic attractor compresses the spring by attracting the pressing plate.

[0009] Furthermore, a filter mesh ring is provided on one side of the liquid receiving pan close to the tower.

[0010] Furthermore, the guide contact is an arc-shaped structure, and one end surface of the conductive ring is provided with a groove adapted thereto.

[0011] Furthermore, a lightning protection net is provided at the bottom of the tower, and a plurality of evenly distributed grounding piles are installed at the lower end of the lightning protection net.

[0012] Furthermore, a water pump is installed on the water pump pipe, and the water pump is fixedly installed on the inner wall of the tower.

[0013] Furthermore, an insulating layer is provided on the surface of the blade, and a conductive layer is provided on one end of the blade close to the guide contact.

[0014] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0015] 1. When the blades are detected to be struck by lightning, the water storage bag and the water spray pipe will spray water to cool the blades to avoid water waste. The spraying position is at the upper end, and the water flow covers a wide area.

[0016] 2. The water storage tank can collect rainwater for backup when it rains, and discharge it through the water pipe to the water spray pipe for use without the need for additional water. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0018] Figure 1A schematic structural diagram of a lightning protection device for a wind turbine generator set provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the internal structure of the lightning protection device for a wind turbine generator set of the present invention when struck by lightning;

[0020] Figure 3 This is a schematic diagram of the internal structure of the wind turbine generator set in the present invention when it is not struck by lightning;

[0021] Figure 4 It is a front structural schematic diagram of the wind turbine generator set in the present invention;

[0022] Figure 5 It is a schematic diagram of the connection structure between the cam structure and the first rod member in the present invention;

[0023] Figure 6 It is a schematic diagram of the connection between the guide contact point on the blade and the conductive ring in the present invention;

[0024] Figure 7 It is a cross-sectional view of the tower in the present invention.

[0025] Icons: 1-blade, 2-tower, 3-main shaft, 4-lightning rod, 5-guiding contact, 6-conductive ring, 7-grounding down conductor, 8-extrusion assembly, 81-force transmission rod, 811-first rod, 812-second rod, 813-pressure plate, 82-mounting plate, 83-spring, 84-electromagnetic absorber, 9-liquid collection tray, 91-filter mesh ring, 10-water storage tank, 11-water suction pipe, 12-water storage bag, 13-water spray pipe, 14-cam structure, 15-lightning net, 16-grounding pile, 17-insulating layer, 18-conductive layer, 19-water pump. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] The following is further described in conjunction with specific embodiments. Figure 1-Figure 7 As shown, this embodiment is a lightning protection device for a wind turbine generator set, comprising a blade 1, a main shaft 3 and a tower 2, and also comprising a lightning rod 4, which is embedded and installed along the surface of the blade 1 and extends from the front end to the rear end thereof, and the rear end of the blade 1 is provided with a guide contact 5 connected to the lightning rod 4; a conductive ring 6, which is arranged outside the cabin, and the guide contact 5 is in sliding contact with one side end surface of the conductive ring 6; a grounding down conductor 7, which is arranged outside the tower 2 and connected to the ground along its surface, and the upper end of the grounding down conductor 7 is in contact with the conductive ring 6; a liquid receiving tray 9 and a water storage tank 10, which are arranged on the tower 2, and the liquid receiving pan 9 is arranged on the top of the water storage tank 10 and communicated with it; a water suction pipe 11 connected to the water storage tank 10 is arranged in the tower 2, and the water suction pipe 11 is connected to the water storage bag 12, and a water spraying pipe 13 is arranged on the upper end of the water storage bag 12; a cam structure 14 corresponding to the blade 1 is installed on the main shaft 3, and the cam structure 14 is connected with the extrusion component 8, and the extrusion component 8 is driven by the rotation of the main shaft 3 to press the water storage bag 12 to spray water; specifically, the liquid receiving pan 9 is an annular skirt arranged on the outside of the tower 2, which can catch a certain amount of rainwater entering on rainy days When the blade 1 rotates, the guide contact 5 on the back side thereof keeps in contact with the conductive ring 6. When the blade 1 is struck by lightning, the current is led into the ground along the lightning rod 4-guide contact 5-grounding down conductor 7. The rotation position of each blade 1 is also synchronously fed back to the main shaft 3. Each protrusion of the cam structure 14 corresponds to the position of the corresponding blade 1 in the circumferential direction. When the blade 1 just rotates to the tower 2, the cam structure 14 presses down the extrusion component 8 once, and then the extrusion component 8 squeezes the water storage bag 12 once. The water in the bag 12 is sprayed along the water spray pipe 13 onto the surface of the blade 1 to cool it down. The spray point is located at the connecting end of the blade 1. Under the action of gravity and centrifugal force, the water flows along the front end of the blade 1 to increase the coverage range and make the overall cooling more uniform. When the extrusion component 8 is separated from the contact with the water storage bag 12, the water storage bag 12 returns to its original state, and the pumping pipe 11 draws the water in the water storage tank 10 into the water storage bag 12 again for use in spraying the next blade 1. This is repeated, thereby preventing the blade 1 from catching fire or overheating and reducing its damage.

[0030] It should be noted that, in non-thunderstorm weather, the extrusion assembly 8 will not contact the cam structure 14, and the water spray pipe 13 will not spray water. However, in normal thunderstorm weather, there is usually strong wind and the blade 1 is in a rotating state.

[0031] Reference Figure 2 and Figure 3As shown in more detail, the extrusion assembly 8 that can be set includes a force transmission rod 81, a mounting plate 82 and a spring 83. The mounting plate 82 is mounted in the tower 2, and the force transmission rod 81 passes through the mounting plate 82 and is slidably connected thereto. The middle part of the force transmission rod 81 is fixedly connected with a pressure plate 813, and the spring 83 is sleeved on the force transmission rod 81, and the spring 83 abuts between the pressure plate 813 and the mounting plate 82, and the top end of the force transmission rod 81 abuts against the cam structure 14; specifically, the cam structure 14 rotates with the main shaft 3, and the top end of the force transmission rod 81 is due to the elastic force of the spring 83, so that the force transmission rod 81 can realize periodic up and down movement during the rotation of the cam structure 14, so that the lower end of the force transmission rod 81 can repeatedly squeeze the water storage bag 12 for periodic water spraying and cooling.

[0032] Reference Figure 3 As shown, the force transmission rod 81 includes a first rod 811 and a second rod 812. In order to ensure that the cabin can adjust its angle normally with the wind direction, the cabin can rotate relative to the tower 2, and then the first rod 811 is rotatably connected with the second rod 812. The first rod 811 can rotate along with the main shaft 3, and the pressure plate 813 is arranged on the second rod 812; specifically, the lower end of the second rod 812 is a cylindrical structure that is in extrusion contact with the water storage bag 12, which can reduce the friction during the extrusion contact process and extend the service life of the water storage bag 12.

[0033] Reference Figure 2 and Figure 3 As shown, an electromagnetic attractor 84 is placed on the mounting plate 82, and the electromagnetic attractor 84 compresses the spring 83 by attracting the pressure plate 813; specifically, in non-thunderstorm weather, the electromagnetic attractor 84 will be energized to adsorb the pressure plate 813 and compress the spring 83, so that the top of the force transmission rod 81 is separated from the cam structure 14, and the water spray pipe 13 does not discharge water at this time; when it is thunderstorm weather, the blade 1 will be struck by lightning through the grounding down conductor 7, and a sensor is arranged on the grounding down conductor 7. When the lightning current is detected, the electromagnetic attractor 84 limits the contact of the pressure plate 813 by adsorption, and the force transmission rod 81 can contact the cam structure 14. The rotation of the blade 1 and the main shaft 3 drives the cam structure 14 to rotate, and the water storage bag 12 begins to periodically aim at each blade 1 to spray water for cooling or extinguishing the fire, thereby achieving a protective effect and reducing economic losses.

[0034] like Figure 4 and Figure 7 In order to prevent too much impurities and dust from entering the water storage tank 10 and accumulating at the bottom thereof, a filter mesh ring 91 is provided on one side of the liquid receiving pan 9 close to the tower 2 .

[0035] like Figure 6As shown, the blade 1 rotates when the pitch is changed, and the guide contact 5 is an arc-shaped structure, and a groove adapted thereto is provided on one end face of the conductive ring 6, so that within a certain angle, the connection contact between the guide contact 5 and the conductive ring 6 will not be disconnected.

[0036] Reference Figure 1 As shown, a lightning protection net 15 is provided at the bottom of the tower 2, and a plurality of evenly distributed grounding piles 16 are installed at the lower end of the lightning protection net 15, so that the current generated by the lightning strike is dispersed and introduced into the ground.

[0037] like Figure 2 As shown, a water pump 19 is installed on the water pumping pipe 11, and the water pump 19 is fixedly installed on the inner wall of the tower 2. Specifically, the water pump 19 is provided to assist in pumping water to improve the pumping efficiency and flow rate.

[0038] like Figure 6 As shown, in order to prevent the inside of the blade 1 from being damaged, an insulating layer 17 is provided on the surface of the blade 1, and a conductive layer 18 is provided at one end of the blade 1 close to the guide contact 5. The current will be transferred to the conductive ring 6 along the lightning rod 4 through the conductive layer 18 and the guide contact 5.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lightning protection device for a wind turbine generator set, comprising a blade (1), a main shaft (3) and a tower (2), characterized in that: It also comprises a lightning rod (4), which is embedded and installed along the surface of the blade (1) and extends from the front end to the rear end thereof, and the rear end of the blade (1) is provided with a guide contact (5) connected to the lightning rod (4); A conductive ring (6) is arranged outside the cabin, and the guide contact (5) is in sliding contact with one end surface of the conductive ring (6); A grounding down conductor (7) is arranged outside the tower (2) and connected to the ground along the surface thereof, wherein the upper end of the grounding down conductor (7) is in contact with the conductive ring (6); A liquid receiving tray (9) and a water storage tank (10), which are arranged outside the tower (2), and the liquid receiving tray (9) is arranged on the top of the water storage tank (10) and communicates with the water storage tank (10); A water pumping pipe (11) communicating with the water storage tank (10) is provided in the tower (2); the water pumping pipe (11) is connected to a water storage bag (12); and a water spraying pipe (13) is provided at the upper end of the water storage bag (12); A cam structure (14) corresponding to the blade (1) is mounted on the main shaft (3); the cam structure (14) is cooperatively connected with an extrusion assembly (8); the main shaft (3) rotates to drive the extrusion assembly (8) to press the water storage bag (12) to spray water.

2. The lightning protection device for wind turbine generator set according to claim 1, characterized in that: The extrusion assembly (8) comprises a force transmission rod (81), a mounting plate (82) and a spring (83); the mounting plate (82) is mounted in the tower (2); the force transmission rod (81) passes through the mounting plate (82) and is slidably connected thereto; a pressure plate (813) is fixedly connected to the middle of the force transmission rod (81); the spring (83) is sleeved on the force transmission rod (81), and the spring (83) is in contact between the pressure plate (813) and the mounting plate (82); the top end of the force transmission rod (81) is in contact with the cam structure (14).

3. The lightning protection device for wind turbine generator set according to claim 2 is characterized in that: The force transmission rod (81) comprises a first rod member (811) and a second rod member (812), the first rod member (811) is rotatably connected to the second rod member (812), and the pressure plate (813) is arranged on the second rod member (812).

4. The lightning protection device for wind turbine generator set according to claim 2 is characterized in that: An electromagnetic attractor (84) is placed on the mounting plate (82), and the electromagnetic attractor (84) compresses the spring (83) by attracting the pressing plate (813).

5. The lightning protection device for wind turbine generator set according to claim 1, characterized in that: A filter mesh ring (91) is provided on one side of the liquid receiving pan (9) close to the tower (2).

6. The lightning protection device for wind turbine generator set according to claim 1, characterized in that: The current guiding contact (5) is an arc-shaped structure, and a groove adapted to the current guiding contact is provided on one end surface of the conductive ring (6).

7. The lightning protection device for wind turbine generator set according to claim 1, characterized in that: A lightning protection net (15) is provided at the bottom of the tower (2), and a plurality of evenly distributed grounding piles (16) are installed at the lower end of the lightning protection net (15).

8. The lightning protection device for wind turbine generator set according to claim 1, characterized in that: A water pump (19) is installed on the water pump pipe (11), and the water pump (19) is fixedly installed on the inner wall of the tower (2).

9. The lightning protection device for wind turbine generator set according to claim 1, characterized in that: An insulating layer (17) is provided on the surface of the blade (1), and a conductive layer (18) is provided at one end of the blade (1) close to the guide contact (5).

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