CN212296728U - Lightning protection device of wind driven generator - Google Patents

Lightning protection device of wind driven generator Download PDF

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Publication number
CN212296728U
CN212296728U CN202020827790.1U CN202020827790U CN212296728U CN 212296728 U CN212296728 U CN 212296728U CN 202020827790 U CN202020827790 U CN 202020827790U CN 212296728 U CN212296728 U CN 212296728U
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China
Prior art keywords
ring
outer ring
inner ring
line connecting
lightning protection
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Expired - Fee Related
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CN202020827790.1U
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Chinese (zh)
Inventor
余振邦
蒲春羽
张琪
李元锦
刘存花
余倩
山成焘
辛洁
杨龙涛
陶世银
何鑫
严玉兵
杨宏
王昌明
文霞
张仙
张婵娟
祁慧
何武成
李富刚
刘延锦
相守贵
黄央奎
张成毅
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Individual
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Individual
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Priority to CN202020827790.1U priority Critical patent/CN212296728U/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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Abstract

The utility model discloses a lightning protection device of a wind driven generator, which comprises an inner ring, an outer ring, a sealing ring A, a sealing ring B, an insulating bracket A, an insulating bracket B, a diversion line connecting part A, a diversion line connecting part B and a lubricating grease box; the inner ring is positioned at the inner side of the outer ring, and a gap capable of being filled with graphite grease is formed between the inner ring and the outer ring; two diversion line connecting parts A are uniformly arranged on the outer side of the outer ring; the inner side of the inner ring is uniformly provided with three diversion line connecting parts B7; four insulating supports A are uniformly arranged on the outer side of the outer ring; four insulating supports B are uniformly arranged on the inner side of the inner ring; a grease box is arranged on the outer side of the outer ring, and a grease injection hole which leads to a gap between the inner ring and the outer ring is formed in the outer ring at the joint of the grease box and the outer ring; the upper ends of the inner ring and the outer ring are provided with sealing rings A for wrapping; the lower ends of the inner ring and the outer ring are provided with sealing rings B for wrapping; the device has the advantages of simple structure, convenient processing, stable physical and chemical properties of the gap filler graphite lubricating grease and good lightning protection effect.

Description

Lightning protection device of wind driven generator
Technical Field
The utility model relates to a aerogenerator lightning protection technical field, concretely relates to prevent direct attack thunder protection device suitable for large-scale aerogenerator blade, wheel hub, cabin.
Background
The wind power industry develops rapidly, the fan is continuously enlarged and the blades are longer and longer along with the increase of the capacity of a single machine, the height of the fan is generally more than 100m, and a wind turbine generator is generally arranged at the wind gap of a valley, on the mountain top and on the open plain, and is easily damaged by lightning stroke relative to the fan which is tall and isolated in the surrounding environment. The blade at the highest position of the fan is most easily struck by lightning, a large amount of energy is released after lightning strikes the blade, and the temperature in the blade structure is sharply increased by lightning current, so that the blade structure is burst, damaged, cracked and even burnt. Lightning current generated by lightning is conducted to the nacelle through the blade and the hub, and damages can be caused to the blade, equipment inside the nacelle and an electrical system, such as: the generator, the gear box, the control system and the like are easy to be damaged by lightning stroke, and the damaged parts are maintained and replaced at high cost, so that the lost generating capacity is high and the economic loss is large. In recent years, manufacturers pay attention to lightning protection of blades gradually, the lightning protection technology of the blades is improved day by day, however, the lightning protection design of the blades faces the common difficult problem that: the blades (hubs) are rotary and are not beneficial to flow guiding, and the lightning protection device aims at quickly conducting lightning current and effectively dissipating the lightning current into the ground; the lightning current diversion technology between the existing rotating part and the static part and between the existing rotating part and the existing rotating part is mainly realized by two modes of a carbon brush and a discharge gap.
When lightning current flow guiding is realized by installing the carbon brush, although a lightning current discharge channel is increased by arranging the carbon brush (marked by yellow in the figure) at the main shaft of the hub, charges of partial lightning current are discharged, but partial lightning current cannot be avoided flowing through a bearing, a gear and other metal parts, overvoltage and electromagnetic pulse generated by the lightning current may damage an electric system and a control system of an engine room, in addition, the flow guiding effect of the carbon brush is determined by the sliding contact area of the carbon brush, the sliding contact area is too large, mechanical abrasion is increased, replacement is frequent, the sliding contact area is insufficient, and then the transition resistance is too large, and the transition of the lightning current is also influenced. In addition, the carbon brush has the characteristic of self material, so that the carbon brush can generate fire and be damaged at high temperature under the condition of large lightning current. Carbon powder generated by carbon brush abrasion can generate pollution, and the carbon powder enters an electrical system to damage a generator, a control system and the like, so that the safe operation of the fan is influenced.
When lightning current is conducted by installing a discharge gap, the discharge gap is a simple lightning protection device consisting of two metal electrodes, one electrode is connected with a protected device, the other electrode is connected with an engine room grounding device, a specified gap distance is kept between the two electrodes, when instantaneous overvoltage (lightning current) is attacked, the gap is broken down, and charges of a part of overvoltage are led into the ground, so that the voltage on the protected device is prevented from rising. In a lightning protection system of a fan, the lightning protection system is generally arranged at a flange of a main shaft of a hub and a bearing and is usually combined with a carbon brush for use, according to the statistics of lightning damage parts of the related fan, the lightning direct-hit blade damage accounts for 15% -20%, and more than 80% of the damage parts are other equipment connected with a down conductor and are caused by lightning surge and lightning electromagnetic pulse generated by lightning. Meanwhile, in a lightning protection system of the fan, the lightning current transition between the rotating parts is usually realized by combining the discharge gap with the carbon brush, and the problem and the defect of the carbon brush directly influence whether the discharge gap plays a role, for example, the lightning current cannot be conducted and the discharge gap cannot play a role due to insufficient sliding contact area of the carbon brush, and the shape of the open circuit is realized.
SUMMERY OF THE UTILITY MODEL
Problem to among the prior art, the utility model relates to a lightning protection device of wind driven generator, the device can pass through the tower body and leading-in earth with the lightning current smoothly from the fan blade, the lightning current has been solved from fan blade to cabin, from the cabin to the transition problem of tower body, avoid partial thunder and lightning to flow through metal parts such as bearing, gear, overvoltage and the electromagnetic pulse that the prevention lightning current produced produce cabin internal plant and electrical system, control system produce the harm, effectual protection fan blade, wheel hub, cabin internal plant does not receive the thunder and lightning harm.
For realizing the purpose of the utility model, the utility model adopts the following technical scheme:
a lightning protection device for a wind driven generator comprises an inner ring, an outer ring, a sealing ring A, a sealing ring B, an insulating support A, an insulating support B, a diversion line connecting part A, a diversion line connecting part B and a lubricating grease box; the inner ring is positioned on the inner side of the outer ring, and a gap capable of being filled with graphite grease is formed between the inner ring and the outer ring; the outer side of the outer ring is uniformly provided with two diversion line connecting parts A; the inner side of the inner ring is uniformly provided with three diversion line connecting parts B7; four insulating supports A are uniformly arranged on the outer side of the outer ring; four insulating supports B are uniformly arranged on the inner side of the inner ring; a grease box is arranged on the outer side of the outer ring, and a grease injection hole which leads to a gap between the inner ring and the outer ring is formed in the outer ring 2 at the joint of the grease box and the outer ring; the upper ends of the inner ring and the outer ring are provided with sealing rings A for wrapping; the lower ends of the inner ring and the outer ring are provided with sealing rings B for wrapping;
preferably, the gap distance between the inner ring and the outer ring is 0.5-2.0 mm.
Preferably, the thickness of the inner ring and the outer ring is 5mm, and the width of the inner ring and the outer ring is 100 mm.
Preferably, the sealing ring A and the sealing ring B are rubber sealing rings, and the sealing ring A and the sealing ring B are fixed on the outer ring to respectively wrap the upper end and the lower end of the inner ring and the outer ring; and the sealing rings A and B are provided with graphite lubricating grease adding holes.
Preferably, the diversion line connecting part A and the diversion lineThe connecting part B is connected with a cross section area larger than 100mm2The shielding diversion cable.
When specifically using, adopt 1#, this lightning protection device of 2# two sets, 1# lightning protection device installs in wheel hub and cabin junction, its inner ring passes through the insulating support to be fixed in wheel hub kuppe side, the outer loop passes through the insulating support to be fixed in cabin cover side, the inner ring passes through the shielding cable conductor and links to each other with blade lightning protection system, the outer ring passes through the outer loop of shielding cable conductor and 2# lightning protection device and is connected, 2# lightning protection transition ring is installed in cabin and pylon junction, the inner ring passes through the insulating support to be fixed at the pylon top, the outer loop passes through the insulating support to be fixed in cabin cover bottom, the inner ring passes through the shielding cable conductor and links to.
Compared with the prior art, the utility model, following beneficial effect has:
the device is erected outside a hub fairing, a cabin cover and a tower frame, conducts lightning current from the outside of a fan, ensures the interval distance between a lightning current conduction path and air of equipment inside the hub and the cabin, realizes an independent discharge channel from a blade lightning current blade to the tower frame through a shielding cable and a lightning protection transition ring, forms electrical insulation with a pitch system, the equipment inside the hub and the cabin and a yaw system, and effectively avoids electrical effect, thermal effect and mechanical force damage to the equipment inside the hub and the cabin caused by lightning flowing through metal parts such as a bearing, a gear and the like. The distance between the hub and the cabin is ensured through external erection, and the influence of induced overvoltage and lightning electromagnetic pulse generated by lightning current on the hub and the cabin internal equipment is effectively reduced.
The device has the advantages of simple structure, convenient processing, stable physical and chemical properties of the gap filler graphite lubricating grease, good compatibility with metal, good arc extinguishing property, abrasion resistance and adhesion, effective reduction of contact resistance of a removing point (the resistance is reduced by 25-95% after the device is coated), improvement of conductivity of a metal contact surface, improvement of conductivity and corrosion protection, and prevention of electrostatic hazard. Taking a 4000mm diameter circular ring as an example, the width is 100mm, and the effective contact area of the inner ring and the outer ring can reach 1256000mm2Namely 1.256 square meters, the contact area is far larger than that of a carbon brush, and the conduction transition of lightning current can be effectively realized.
In addition, the graphite lubricating grease has no corrosion to metal materials, good lubricating performance, reduced abrasion of contact parts, long service life, simple maintenance, low cost, energy conservation and environmental protection, and the service temperature of-50-150 ℃ is suitable for most areas in China, generally years to dozens of years.
Drawings
Fig. 1 is a schematic structural diagram of a lightning protection device for a fan blade according to the present invention;
FIG. 2 is a top view of a lightning protection device for a fan blade;
FIG. 3 is a cross-sectional view taken at A-A in FIG. 2;
in the figure: the inner ring 1, the outer ring 2, the sealing ring A3, the sealing ring B31, the insulating support A4, the insulating support B5, the diversion line connecting part A6, the diversion line connecting part B7, the lubricating grease box 8 and the grease filling hole 9.
Detailed Description
The drawings in the embodiments of the present invention will be combined; to the technical scheme in the embodiment of the utility model, clearly, describe completely:
as shown in fig. 1-3, in an embodiment of the present invention, a lightning protection device for a wind power generator includes an inner ring 1, an outer ring 2, a sealing ring A3, a sealing ring B31, an insulating support a4, an insulating support B5, a guide line connecting portion a6, a guide line connecting portion B7, and a grease box 8; the inner ring 1 is positioned on the inner side of the outer ring 2, a gap exists between the inner ring 1 and the outer ring 2, and graphite grease can be injected into the gap, so that the inner ring 1 and the outer ring 2 can rotate mutually conveniently; the outer side of the outer ring 2 is uniformly provided with two guide line connecting parts A6, namely the two guide line connecting parts A6 form an angle of 180 degrees with the connecting line of the circle center of the circle where the outer ring 2 is located; the inner side of the inner ring 1 is uniformly provided with three guide line connecting parts B7, namely, the connecting lines of the three guide line connecting parts B7 and the circle center of the circle of the inner ring 1 form 3 angles of 120 degrees; four insulating supports A4 are uniformly arranged on the outer side of the outer ring 2; four insulating supports B5 are uniformly arranged on the inner side of the inner ring 1; a grease box 8 is arranged on the outer side of the outer ring 2, and a grease injection hole 9 which leads to a gap between the inner ring 1 and the outer ring 2 is formed in the outer ring 2 at the joint of the grease box 8 and the outer ring 2; when in use, the graphite grease can be firstly injected into the grease box 8, and the graphite grease enters the gap between the inner ring 1 and the outer ring 2 through the grease injection hole 9; in order to prevent graphite grease from flowing out from gaps at the upper and lower parts of the inner ring 1 and the outer ring 2, the upper ends of the inner ring 1 and the outer ring 2 are wrapped by sealing rings A3; the lower ends of the inner ring 1 and the outer ring 2 are wrapped by a sealing ring B31;
in a specific embodiment of the present invention, the gap distance between the inner ring 1 and the outer ring 2 is 0.5 mm.
In a specific embodiment of the present invention, the gap distance between the inner ring 1 and the outer ring 2 is 1.0 mm.
In a specific embodiment of the present invention, the gap distance between the inner ring 1 and the outer ring 2 is 2.0 mm.
In a specific embodiment of the present invention, the thickness of the inner ring 1 and the outer ring 2 is 5mm, and the width is 100 mm.
In a specific embodiment of the present invention, the sealing rings A3 and B31 are rubber sealing rings, and the sealing rings A3 and B31 are fixed on the outer ring 2 to wrap the upper and lower ends of the inner ring 1 and the outer ring 2, respectively, so as to prevent leakage of graphite grease, and prevent impurities such as rain and dust from polluting grease to affect the conductive effect; the sealing rings A3 and B31 are provided with graphite grease adding holes for adding and replacing grease.
In a specific embodiment of the present invention, the diversion line connecting portion a6 and the diversion line connecting portion B7 are connected to each other with a sectional area > 100mm2The shielding diversion cable.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the improvement concept of the present invention within the technical scope disclosed in the present invention, and all the technical solutions and the improvement concepts should be covered by the protection scope of the present invention.

Claims (5)

1. The utility model provides a aerogenerator lightning protection device which characterized in that: the sealing ring comprises an inner ring, an outer ring, a sealing ring A, a sealing ring B, an insulating support A, an insulating support B, a diversion line connecting part A, a diversion line connecting part B and a lubricating grease box; the inner ring is positioned on the inner side of the outer ring, and a gap capable of being filled with graphite grease is formed between the inner ring and the outer ring; the outer side of the outer ring is uniformly provided with two diversion line connecting parts A; the inner side of the inner ring is uniformly provided with three diversion line connecting parts B (7); four insulating supports A are uniformly arranged on the outer side of the outer ring; four insulating supports B are uniformly arranged on the inner side of the inner ring; a grease box is arranged on the outer side of the outer ring, and a grease injection hole which leads to a gap between the inner ring and the outer ring is formed in the outer ring at the joint of the grease box and the outer ring; the upper ends of the inner ring and the outer ring are provided with sealing rings A for wrapping; and the lower ends of the inner ring and the outer ring are wrapped by sealing rings B.
2. The lightning protection device for the wind driven generator according to claim 1, wherein: the gap distance between the inner ring and the outer ring is 0.5-2.0 mm.
3. The lightning protection device for the wind driven generator according to claim 1, wherein: the thickness of the inner ring and the outer ring is 5mm, and the width of the inner ring and the outer ring is 100 mm.
4. The lightning protection device for the wind driven generator according to claim 1, wherein: the sealing rings A and B are rubber sealing rings, and the sealing rings A and B are fixed on the outer ring to respectively wrap the upper end and the lower end of the inner ring and the outer ring; and the sealing rings A and B are provided with graphite lubricating grease adding holes.
5. The lightning protection device for the wind driven generator according to claim 1, wherein: the diversion line connecting part A and the diversion line connecting part B are connected with a cross section area larger than 100mm2The shielding diversion cable.
CN202020827790.1U 2020-05-18 2020-05-18 Lightning protection device of wind driven generator Expired - Fee Related CN212296728U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202020827790.1U CN212296728U (en) 2020-05-18 2020-05-18 Lightning protection device of wind driven generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202020827790.1U CN212296728U (en) 2020-05-18 2020-05-18 Lightning protection device of wind driven generator

Publications (1)

Publication Number Publication Date
CN212296728U true CN212296728U (en) 2021-01-05

Family

ID=73967901

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202020827790.1U Expired - Fee Related CN212296728U (en) 2020-05-18 2020-05-18 Lightning protection device of wind driven generator

Country Status (1)

Country Link
CN (1) CN212296728U (en)

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Granted publication date: 20210105