CN102979676A - Luminous energy and wind energy gradient power system applying magnetic suspension technique - Google Patents
Luminous energy and wind energy gradient power system applying magnetic suspension technique Download PDFInfo
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- CN102979676A CN102979676A CN2011102636018A CN201110263601A CN102979676A CN 102979676 A CN102979676 A CN 102979676A CN 2011102636018 A CN2011102636018 A CN 2011102636018A CN 201110263601 A CN201110263601 A CN 201110263601A CN 102979676 A CN102979676 A CN 102979676A
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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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- 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
- Y02E10/74—Wind turbines with rotation axis perpendicular to the wind direction
Abstract
The invention discloses a luminous energy and wind energy gradient power system applying magnetic suspension technique. The luminous energy and wind energy gradient power system applying the magnetic suspension technique comprises a base seat, wind-guide columns, a dome, solar power devices, a radial flow impeller, an axial flow impeller, generators and a control unit. The wind-guide columns with a fusiform cross section are placed on the base seat, and the wind-guide columns are arranged in a method that a circumference is enclosed by the wind-guide columns clockwise or anticlockwise. The dome is covered on the wind-guide columns which are enclosed into the circumference. Solar power systems are respectively installed on the dome and the outer walls of the wind-guide columns. The radial flow impeller is arranged in the circumference which is enclosed by the wind-guide columns through a magnetic suspension bearing. The axial flow impeller is placed on the radial flow impeller through the magnetic suspension bearing and is designed to share coaxiality with the radial flow impeller. A plurality of generators are respectively connected with the radial flow impeller and the axial flow impeller. The control unit is connected with and controls the generators, and launches required generators according to wind energy value and gradient. The luminous energy and wind energy gradient power system applying the magnetic suspension technique is capable of generating by combining the luminous energy and the wind energy at the same time, and is capable of utilizing axial wind and radial wind at the same time. Especially, the magnetic suspension technique is applied, so that mechanical friction is reduced. In the mean time, the structure and other design characteristics of the wind-guide columns are combined, so that the generating efficiency is greatly improved.
Description
Technical field
The present invention relates to the power generation system field, particularly relate to and a kind ofly can utilize simultaneously luminous energy and wind energy to generate electricity and used the efficient power generation system of the machinery-free friction of magnetic levitation technology.
Background technique
THE WIND ENERGY RESOURCES IN CHINA is abundant, about 1,000,000,000 kilowatts of the wind energy content that can develop, according to Eleventh Five-Year Plan, the year two thousand twenty China Wind Power capacity of installed generator will reach 3,000 ten thousand kilowatts and 60,000,000,000 kilowatt hour electric weight, and the year two thousand thirty electric motor power will reach 100,000,000 kilowatts and 2,000 hundred million kilowatt hour electric weight.National governments also attach great importance to the development of Wind Power Generation Industry, and since calendar year 2001, global annual installed capacity of wind-driven power growth rate is 20%～30%, only just increases by the installed capacity of wind-driven power of 20 GW in 2007, is roughly equal to 31,000,000,000 dollars.
Wind-power electricity generation year increased all about 50% the America and Europe in recent years.So huge market provides rare opportunity to develop for China wind power equipment manufacturing enterprise.Add that country supports wind-driven generator manufacturing production domesticization and cultivates independent brand, complete machine manufacturing enterprise and component manufacturing enterprise to megawatt-level wind unit with independent intellectual property right and independent brand give the fund subsidy, encourage enterprise to carry out research and development, process modification and the experiment and demonstration of new product.According to the target that proposes in National Development and Reform Committee's " planning of renewable energy sources Long-and Medium-term Development ", the wind-powered electricity generation of China install 2010 4000000 kilowatts, 2015 1000 ten thousand kilowatts, 2,000 ten thousand kilowatts of the year two thousand twenties, when the time comes wind-powered electricity generation installation accounts for 2% of national electric power installation.In order to realize this goal, need at least MW class wind turbine 4000-20000 platform, the market demand is huge.Because at present the wind energy conversion system cost is too high, even wind power cost exceeds 2/3 than thermoelectricity cost, therefore, though the advantage such as that wind-powered electricity generation has is pollution-free, can regenerate is difficult to large-scale promotion.
At present; vertical shaft wind motor reaches its maturity; its cost of electricity-generating is also hanged down two one-tenth 10000 watts of wind energy conversion system products of Duoing than thermoelectricity; it can further develop the huge wind energy conversion system more than 1000 kilowatts fully; to realize large-scale promotion; change is alleviated the harm that pollution of atmosphere is warmed greatly take thermoelectricity as main world energy sources general layout.Under the domination of price rule, wind energy has been had ready conditions and has been popularized in an all-round way, thereby substitutes the main energy sources that thermoelectricity becomes the new century.
The average growth rate per annum of global wind-powered electricity generation accumulative total electric motor power is near 30% over past ten years, and the nearly 3 years wind-powered electricity generation installation average growth rate per annum of China has surpassed 70%, China is the fastest-rising market of present global wind-power electricity generation, the wind-powered electricity generation industry becomes a Chaoyang industry that development space is huge gradually under background increasingly severe in Present Global energy shortage, environmental pollution situation, that the requirement of energy-saving and emission-reduction is constantly strengthened.
Summary of the invention
The present invention acts on above-mentioned idea of development, and a kind of luminous energy and wind energy minute gradient power generation system of using magnetic levitation technology is provided.The present invention can be simultaneously in conjunction with luminous energy and wind energy power, and can utilize simultaneously axial wind, footpath aweather, has especially adopted magnetic levitation technology, has reduced mechanical friction, in conjunction with the design features such as structure of air inducing post, has increased substantially generating efficiency simultaneously.
In order to achieve the above object, technological scheme provided by the present invention is:
A kind of luminous energy and wind energy minute gradient power generation system of using magnetic levitation technology comprises pedestal, air inducing post, dome, device of solar generating, radial-flow impeller, axial-flow blower, generator and control unit; It is the air inducing post of fusiformis that cross section is installed on the described pedestal, and described air inducing post is by surrounding clockwise or counterclockwise the circumference setting; Described dome mounts cover and is surrounding on the air inducing post of circumference; Described device of solar generating is installed in respectively on the outer wall of dome and air inducing post; Described radial-flow impeller is installed in the air inducing post by magnetic suspension bearing and surrounds in the circumference; Described axial-flow blower is installed on the radial-flow impeller by magnetic suspension bearing, and designs with the radial-flow impeller coaxality; Described a plurality of generator connects respectively radial-flow impeller and axial-flow blower, and described control unit connects the control generator, divides gradient to start the generator of requirement according to the wind energy value.
Further, described radial-flow impeller radially be the most effective windward side, the footpath that utilizes the air inducing post to introduce aweather drives its rotation.
Further, described axial-flow blower axially be the most effective windward side, the footpath that described air inducing post is introduced is aweather by behind the radial-flow impeller, be transformed into vertically air-flow up, utilize this air-flow and up air-flow and the wind introduced of air inducing post drives the axial flow wheel rotation from ground because the temperature difference is formed.
Further, described magnetic suspension bearing is the ring-type composite structure of being made by permanent magnet.
Further, described pedestal adopts concrete for making, is provided with the generating cabin in its circle that surrounds.
Further, also comprise lightning conductor, described lightning conductor is installed in described dome top, and is connected to the discharge ground wire.
Further, be provided with tele-control system in the described control unit.
Further, the blade of described radial-flow impeller is hollow structure, is provided with dividing plate and shaping board in it, and blade pass is crossed steel wire and is packed on the wheel rotation assembly.
Further, described blade, dividing plate and shaping board are made by aluminium.
Further, described lightning conductor is the taper tubular of aluminium matter, is divided into multistage, and its middle part is provided with high-altitude observation ward.
Adopt technique scheme, technique effect of the present invention has:
1. innovative point one of the present invention: vertical fixing without axis--the wind of any direction of the present invention can generate electricity, and because without axis, complete machine running Security is very high.Without gyro power and tower shadow effect, the unit safety operation stable electric generation there is better promoting effect in the fan blade operation process.The Whole Equipment center of gravity is lower, and the devices such as generator set transmission, retarding braking are dispersed on each generator, so that installation, maintenance is convenient and cost is lower.By force, during strong wind, the operations such as deceleration, shutdown can be controlled in classification, safer easily--the overall structure performance is more excellent.
2. innovative point two of the present invention: high-power--design proposal of the present invention can suit measures to local conditions to provide multikilowatt, MW class, noise free more than ten MW class and green type and the local high efficiency air field of high conversion by design cycle.
3. innovative point three of the present invention: high efficiency--the present invention has installed device of solar generating in outer wall, greatly utilize solar energy and (by narrow wall tube effect) sunlight infrared radiant energy and wind energy surplus to generate electricity, reached the purpose of fully, efficiently utilizing natural resources to produce green energy; In addition because the application of magnetic levitation technology, in the equipment operation process, can effectively reduce a large amount of because of parts surface friction drag spent energy and equipment frictional loss, thereby directly effectively improve the generating efficiency of complete machine.
4. innovative point four of the present invention: the independent control gradient of control unit suits generating--from unglazed to light is arranged, from calm to wind being arranged to strong wind, the design's composite type wind power generator can be inputted according to the different energy of Different climate, by the science quotas administered of control system, can make the different output electric weight of providing of generator set safety and stability.
5. innovative point five of the present invention: advanced control system--the safety controls by many group inductors and two-stage safety control system among the design, can guarantee that complete machine can both be survived safely and stable operation under different wind energy effects, be that the strong and the most practical band of adaptability is promoted control system now.
6. innovative point six of the present invention: the wind speed adaptability of wide cut--design of pitch-controlled system has improved the at home comprehensive adaptive capacity under the different wind field resources supplIess of each department of this type to a great extent among the design, has also demonstrated fully the light breeze in the present design and starts---breeze wind and have the design philosophy of advanced distinct Chinese characteristics.
7. innovative point seven of the present invention: non-carbon-emitting--the electric energy that the utilization of wind energy produces among the design is the green energy resource of the non-carbon-emitting of pure environment protection type, being new born eco-friendly power source new varieties again on water power, nuclear power basis, is short, instant effect and the very fast green energy resource manufacturing mechanism that can finish Chinese target for energy-saving and emission-reduction of less investment, time.
8. innovative point eight of the present invention: local networking--present design is for the area away from power plant such as remote mountain areas, wasteland, Gobi desert, set up a Small-scale LAN and can satisfy ten thousand family needs for electricity by building several large-scale units, need not again to pay the vertical rod backguy and prolong the fund of continuous hundreds of kilometer and expend with manpower and expend.
Description of drawings
Fig. 1 is the main structure schematic representation of the embodiment of the invention;
Fig. 2 is the dome structure schematic representation of the embodiment of the invention;
Fig. 3 is the axial-flow blower structural representation of the embodiment of the invention;
Fig. 4 is the blade arrangement plan view of the radial-flow impeller of the embodiment of the invention;
Fig. 5 is the blade structure schematic representation of the radial-flow impeller of the embodiment of the invention;
Fig. 6 is the schematic top plan view that the air inducing post of the embodiment of the invention is arranged;
Fig. 7 is that the embodiment of the invention is installed in the magnetic suspension bearing schematic representation on the axial-flow blower;
Fig. 8 is that the embodiment of the invention is installed in the magnetic suspension bearing schematic representation on the radial-flow impeller.
Wherein: 1 pedestal, 2 air inducing posts, 3 supports, 4 domes, 5 device of solar generating, 6 radial-flow impellers, 61 blades, 62 dividing plates, 63 shaping boards, 64 steel wires, 7 axial-flow blowers, 8 magnetic suspension bearings, 9 generators, 10 control units, 11 lightning conductor, 111 high-altitude observation ward.
Embodiment
The exploitation of the MW class imitation experiment model machine that we carry out, rigorous scientific and technological theory, utilize the structural design of modularization, cascade, electromagnetic suspension technology and the uniquenesses such as aerodynamic principle and cascade to obtain important breakthrough at the vertical shaft wind electrical domain, successfully researched and developed the present invention, prove through primary Calculation, this design is better than the in the world performance of any similar products, still belongs to pioneering in the whole world.Wind-power electricity generation is a comprehensive very strong system engineering technology, relates to aerodynamic force, structural mechanics, aircraft manufacturing technique, manufacturing technology, electrical engineering and the automatic multiple subject such as control and the communications field.
We are through reaching years of researches design and the improvement of constantly bringing forth new ideas, the present invention has has researched and developed successfully, and entered the trial-production program, soon this new feature, high efficiency, new ideas, can adapt to different classes of wind-resources energy maximization, can be about to come out with the civil power the first in the world platform Megawatt-level vertical axis wind driven generator that electricity price competes mutually that is incorporated into the power networks.
Below in conjunction with description of drawings the specific embodiment of the present invention.
As shown in Figure 1, a kind of luminous energy and a wind energy minute gradient power generation system of using magnetic levitation technology comprises pedestal 1, air inducing post 2, dome 4, device of solar generating 5, radial-flow impeller 6, axial-flow blower 7, generator 9 and control unit 10, pedestal 1 is used for power generation system is fixedly mounted with on the ground, pedestal 1 is according to construction ground geological condition, the concrete for making that is preferably with suitable cement grade (is the reduction cost, can adopt the rock-fill concrete technical matters according to actual conditions), preset the metallic steel structure in it and play antihunt action (generally selecting effective antidetonation 30 time limits according to local seismographic record), implementation will be determined according to the job location geological condition.Pedestal 1 is interior can also to arrange the generating cabin, is used for laying generator 9 etc.Shown in Fig. 1,6, the cross section of air inducing post 2 is fusiformis (being commonly called as the fish-skin column type), many air inducing posts 2 are being installed on the pedestal 1, and be and surround clockwise or counterclockwise circumference (Figure 6 shows that clockwise and arrange), be used for the guiding wind direction, and can increase the wind speed after the introducing, improve the efficient of wind-power electricity generation, concrete, its effect except supporting effect, also with the wind of larger tangent plane beyond the air port, with less variable draw angle (with the highest effect of minimum drag) introduce enclosed in the impeller in the circumference, to increase the intake grill wind speed, improve the blower fan effect.It is overall structure that support 3 is used for each several part bridge joint of the present invention, in particular for fixing magnetic suspension bearing 8; Dome 4(such as Fig. 1,2) mount cover and surrounding on the air inducing post 2 of circumference.Device of solar generating 5 is installed on the outer wall of dome 4 and air inducing post 2, the device of solar generating 5 preferred photovoltaic generating systems that adopt, can directly utilize solar energy to generate electricity, and (by narrow wall tube effect) sunlight infrared radiant energy and wind energy surplus be generated electricity.
Radial-flow impeller 6 is installed in air inducing post 2 by magnetic suspension bearing 8 and surrounds (such as Fig. 1,4) in the circumference, its impeller radially be the most effective windward side, the footpath that can utilize air inducing post 2 to introduce aweather drives its rotation, and then realization wind-power electricity generation, the present invention does not need to arrange main shaft, but employing magnetic levitation technology, concrete, magnetic suspension bearing 8 is installed in bottom and the circumference (such as Fig. 1,7) of radial-flow impeller 6 by support 3, with radial-flow impeller 6 outstanding being contained in this power generation system, can reduce the surface friction drag of rotation, improve greatly generating efficiency; The blade 61(of radial-flow impeller 6 such as Fig. 4,5) be preferably designed for the hollow structure of lightweight, be provided with dividing plate 62 and shaping board 63 in it, and preferably adopt the high-intensity aluminium of light weight to make, blade 61 connects the wheel rotation assembly by steel wire 64, the linkage structure of steel wire 64 has the effect of certain auxiliary axial restraint, and alleviate fan blade assembly rotating part weight, totally reduce cost.
Axial-flow blower 7 is installed on the radial-flow impeller 6 by magnetic suspension bearing 8, and design (such as Fig. 1 with radial-flow impeller 6 coaxalitys, shown in 3), its impeller axially be the most effective windward side, the footpath that air inducing post 2 is introduced is aweather by behind the radial-flow impeller 6, be transformed into vertically air-flow up, utilize this air-flow and up air-flow and the wind introduced of air inducing post 2 drives axial-flow blower 7 and rotates from ground because the temperature difference is formed, and then realization wind-power electricity generation, the same with magnetic suspension bearing 8 mounting types of radial-flow impeller 6, magnetic suspension bearing 8 is installed in the bottom of axial-flow blower 7 and circumference (such as Fig. 1 by support 3,8), be used for axial-flow blower 7 outstanding being contained in this power generation system, reduce the surface friction drag that rotates, further improve generating efficiency.
The present invention comprises that also lightning conductor 11(sees Fig. 1), lightning conductor 11 is installed in described dome 4 tops, and is connected to the discharge ground wire, can be designed as the taper tubular of aluminium matter, multi-segment structure, its middle part can also be designed to high-altitude observation ward 111.Concrete, the centrum bottom welding of lightning conductor 11 can be fixed in lightning conductor 11 on the dome 4 by the flange circle on the flange circle.Its advanced person's lightning-arrest discharge process is embodied in, and is most advanced and sophisticated fixing by lightning conductor 11 tops, and the plain conductor that directly is connected with the pre-buried electrical discharge wire in ground is fine copper matter, and prolongs whole wind turbine body axis (beeline) design and installation.
The application of magnetic levitation technology of the present invention, in the less situation of power generation system (especially axial flow power generation system) output total output, in order to increase generated energy, and the solution of the increase transformation of energy effect of design, basic principle is, as shown in Figure 7 and Figure 8, permanent magnet is made as the major diameter associative ring, utilizes the repulsion of permanent magnet, two magnet ring same polarity mirror images is opposed and fixed, adopt inside and outside multi-turn design, then formed superhuge frictionless magnetic suspension bearing, because without surface friction drag, so can be efficiently with transformation of energy and output, through experiment, this device can narrow down to below the 3m/s starting wind speed.During concrete the installation, be preferably the contactless bearing that magnet is made, be arranged at respectively the revolution position of blade steel ring and suspension corridor below, and suspension corridor upper side and hot-fluid circle inwall.
During concrete operation, device of solar generating 5 utilizes solar electrical energy generation.Simultaneously, under the effect of air inducing post 2, be introduced into wind in the radial-flow impeller 6 and can increase wind speed, drive it and rotate and drive corresponding generator 9 generatings.Wind changes into axially after radial-flow impeller 6 actings, up is blown into axial-flow blower 7, and the air-flow that combined ground is introduced because of air-flow up and the air inducing post 2 of hot-fluid formation drives axial-flow blower 7 and rotates, and drives corresponding generator 9 generatings.Especially, the mechanical friction resistance of rotation process has been removed in the application of magnetic suspension bearing 8, has improved greatly generating efficiency, and through experiment, minimum wind speed 3m/s can generate electricity.Under the effect of control unit 10, the present invention can start according to default gradient wind energy value the generator 9 of requirement, is in the optimal operation state to guarantee all the time the present invention, realizes most powerful generating.In addition, the tele-control system in the control unit 10 can be realized remote monitoring etc., make the present invention more practical, have more promotional value.
It should be noted that at last, above embodiment is only unrestricted in order to technological scheme of the present invention to be described, although with reference to preferred embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement technological scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (10)
1. luminous energy and a wind energy minute gradient power generation system of using magnetic levitation technology is characterized in that: comprise pedestal (1), air inducing post (2), dome (4), device of solar generating (5), radial-flow impeller (6), axial-flow blower (7), generator (9) and control unit (10); It is the air inducing post (2) of fusiformis that cross section is installed on the described pedestal (1), and described air inducing post (2) is by surrounding clockwise or counterclockwise the circumference setting; Described dome (4) mounts cover and is surrounding on the air inducing post (2) of circumference; Described device of solar generating (5) is installed in respectively on the outer wall of dome (4) and air inducing post (2);
Described radial-flow impeller (6) is installed in air inducing post (2) by magnetic suspension bearing (8) and surrounds in the circumference; Described axial-flow blower (7) is installed on the radial-flow impeller (6) by magnetic suspension bearing (8), and designs with radial-flow impeller (6) coaxality;
Described a plurality of generator (9) connects respectively radial-flow impeller (6) and axial-flow blower (7), and described control unit (10) connects control generator (9), divides gradient to start the generator (9) of requirement according to the wind energy value.
2. the luminous energy of application magnetic levitation technology according to claim 1 and wind energy are divided the gradient power generation system, it is characterized in that: described radial-flow impeller (6) radially be the most effective windward side, the footpath that utilizes air inducing post (2) to introduce aweather drives its rotation.
3. the luminous energy of application magnetic levitation technology according to claim 1 and wind energy are divided the gradient power generation system, it is characterized in that: described axial-flow blower (7) axially be the most effective windward side, the footpath that described air inducing post (2) is introduced is aweather by behind the radial-flow impeller (6), be transformed into vertically air-flow up, utilize this air-flow and up air-flow and the wind introduced of air inducing post (2) drives axial-flow blower (7) and rotates from ground because the temperature difference is formed.
4. the luminous energy of application magnetic levitation technology according to claim 1 and wind energy are divided the gradient power generation system, it is characterized in that: described magnetic suspension bearing (8) is the ring-type composite structure of being made by permanent magnet.
5. the luminous energy of application magnetic levitation technology according to claim 1 and wind energy are divided the gradient power generation system, it is characterized in that: described pedestal (1) adopts concrete for making, is provided with the generating cabin in it.
6. the luminous energy of application magnetic levitation technology according to claim 1 and wind energy are divided the gradient power generation system, it is characterized in that: also comprise lightning conductor (11), described lightning conductor (11) is installed in described dome (4) top, and is connected to the discharge ground wire.
7. the luminous energy of application magnetic levitation technology according to claim 1 and wind energy are divided the gradient power generation system, it is characterized in that: described control unit is provided with tele-control system in (10).
8. the luminous energy of application magnetic levitation technology according to claim 2 and wind energy are divided the gradient power generation system, it is characterized in that: the blade (61) of described radial-flow impeller (6) is hollow structure, be provided with dividing plate (62) and shaping board (63) in it, blade (61) is packed on the wheel rotation assembly by steel wire (64).
9. the luminous energy of application magnetic levitation technology according to claim 8 and wind energy are divided the gradient power generation system, it is characterized in that: described blade (61), dividing plate (62) and shaping board (63) are made by aluminium.
10. the luminous energy of application magnetic levitation technology according to claim 6 and wind energy are divided the gradient power generation system, it is characterized in that: described lightning conductor (11) is divided into multistage for the taper tubular of aluminium matter, and its middle part is provided with high-altitude observation ward (111).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104806444A (en) * | 2014-12-26 | 2015-07-29 | 智慧城市信息技术有限公司 | Vertical axis wind power generation device |
| CN111878328A (en) * | 2020-06-17 | 2020-11-03 | 河南恒聚新能源设备有限公司 | Suspension bearing for vertical axis wind power generation device |
| CN112523966A (en) * | 2020-11-23 | 2021-03-19 | 裴亮 | Motor protection device for wind power generation |
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