CN101545452B - Vertical wind-powered generator - Google Patents
Vertical wind-powered generator Download PDFInfo
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- CN101545452B CN101545452B CN2009100381229A CN200910038122A CN101545452B CN 101545452 B CN101545452 B CN 101545452B CN 2009100381229 A CN2009100381229 A CN 2009100381229A CN 200910038122 A CN200910038122 A CN 200910038122A CN 101545452 B CN101545452 B CN 101545452B
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- 230000005611 electricity Effects 0.000 claims description 34
- 239000000725 suspension Substances 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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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
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Abstract
The invention discloses a vertical wind-powered generator which comprises a tower column, a generator and more than two blades, wherein the tower column is hollow, the tower column is provided with more than one generating device; and each generating device consists of a first lower flange and a first upper flange which are arranged on the tower column, a first bearing support, a first bearing, a first generator, a generator center column, a second bearing, a second bearing support, a second low flange and a second upper flange. The invention has simple and safe structure, small occupation area, low cost and quite high wind energy utilization ratio.
Description
Technical field
The present invention relates to wind-driven generator, especially a kind of vertical wind power generator.
Background technique
The modern wind generator mainly has following two kinds of designs: horizontal axis wind-driven generator and vertical axis aerogenerator, in vertical axis aerogenerator, rotating shaft is installed on the vertical shaft, and is perpendicular to the ground.Different with the like product of horizontal shaft type, vertical axis aerogenerator is consistent with wind direction all the time, therefore need not to adjust when change of the wind; It uses drag-line rather than pylon to support usually, so rotor height is lower.Wherein, the Darrieus turbo machine is belong to vertical wind power generator a kind of, and this turbo machine comprises vertical rotation axis, be positioned at top rotor center, the blade at rotating shaft top, be positioned at the bottom rotor center of rotating shaft bottom, the gearbox that is connected with rotating shaft, the generator composition that is connected with gearbox.The upper end of blade is connected the top rotor center, and the blade lower end is connected in the bottom centre, and blade rotates the back and drives the vertical rotation axis rotation, behind the gearbox that rotating shaft is provided with through the bottom with transmission of power to generator, thereby make generator for electricity generation.Because this kind wind-driven generator is huger, rotating shaft is generally than higher, and in order to strengthen its steadiness, to the bottom surface, though rotating shaft has obtained reinforcing, its floor space is bigger from rotating shaft top drag-line, is unfavorable for effective utilization in soil.In addition, this wind-power electricity generation process medium power Transmitted chains is too long, drive blade by wind-force, blade drives vertical rotation axis, and rotating shaft drives the inner speed change gear of gearbox, and gearbox drives generator amature, power has to transmit just must have loss, so, power loses bigger in transmittance process, is unfavorable for effective utilization of energy.Moreover, comprised in the electricity generating device how the cover parts just can be finished generating for gearbox, generator, transmission shaft etc., and structure is comparatively complicated, in case electricity generating device breaks down, aspect maintenance and the repairing certain degree of difficulty are being arranged.
Summary of the invention
Technical problem to be solved by this invention provides a kind of vertical wind power generator, not only few, the simple in structure safety of floor space, cost is low and for ease of maintenaince, and to the conversion ratio height of wind energy.
For solving the problems of the technologies described above, technological scheme of the present invention is: a kind of vertical wind power generator comprises king-post, generator and the blade more than two; Described king-post is hollow, is provided with more than one electricity generating device on described king-post;
Described electricity generating device is made up of first lower flange and first upper flange plate, clutch shaft bearing seat, clutch shaft bearing, first generator, generator newel, second bearing, second bearing support, second lower flange and second upper flange plate that are arranged on the king-post;
Described first lower flange and king-post fix, described first upper flange plate is positioned on first lower flange and with first lower flange fixedlys connected, described clutch shaft bearing seat is fixed on first upper flange plate, described clutch shaft bearing is made of first outer ring, the first steel ball group and first inner ring, described first inner ring is fixed on the clutch shaft bearing seat, and described first outer ring and the first steel ball group can be rotated around first inner ring;
Described first generator comprises first inner stator and first external rotor, and described first inner stator is positioned on first inner ring, and described first external rotor is positioned on first outer ring and with first outer ring fixedlys connected; Described generator newel is hollow, and described generator newel is arranged in first inner stator, and described generator newel is fixedlyed connected with first inner stator;
Above described generator newel, be provided with second bearing successively, second bearing support, second lower flange and second upper flange plate, described second upper flange plate and king-post fix, described second lower flange is positioned at second upper flange plate below and fixedlys connected with second upper flange plate, described second bearing seat is fixedlyed connected in second lower flange below and with second lower flange, described second bearing is by second outer ring, the second steel ball group and second inner ring constitute, described second inner ring is positioned at second bearing support below and fixedlys connected with second bearing support, and described second outer ring and the second steel ball group can be rotated around second inner ring;
Fixedlying connected with second outer ring in the upper end of described blade, fixedlys connected with first outer ring in the lower end of described blade.
The support of vertical wind power generator mainly relies on the king-post at center, and electricity generating device is installed on the king-post, has significantly reduced the floor space of vertical wind power generator.Electricity generating device among the present invention is made up of two bearings, blade and generators, and this is simple in structure, and it is simple that the kind of drive also becomes; And the structure in aggregates that interfixes between the outer ring of blade, bearing and the external rotor of generator makes the external rotor of generator be equivalent to the part of blade, and the rotating speed of blade is exactly the rotating speed of generator external rotor, and is quite high to utilization ratio of wind energy.
As improvement, be provided with first adpting flange between the lower end of described first outer ring and blade, fixedly connected with first outer ring by first adpting flange in the lower end of described blade; Being provided with second adpting flange between the upper end of described second outer ring and blade, fixedlys connected with second outer ring by second adpting flange in the upper end of described blade.
As improvement, the described clutch shaft bearing or second bearing are provided with the speed reducer that reduces by first outer ring or the second outer ring rotating speed.
As improvement, described second bearing below is provided with second generator, and described second generator comprises second inner stator and second external rotor; Described second inner stator is positioned at second bearing inner race below, and described second inner stator is fixedlyed connected with the generator newel; Described second external rotor is positioned at second bearing outer ring below and fixedlys connected with the outer ring.
As improvement, described king-post top is provided with suspension bracket, and described suspension bracket and king-post top are articulated, and described suspension bracket is provided with arm, hoisting apparatus and suspension hook.
As improvement, described king-post inside is provided with elevator, and described elevator comprises car and car elevator mechanism.
The beneficial effect that the present invention is compared with prior art brought is:
I, use drag-line fixed power generator, the present invention only to rely on king-post to support electricity generating device more in the past, and made the shared ground area of whole vertical wind power generator still less.II, whole generating device are made up of two bearings, blade and generators, and this is simple in structure, and it is simple that the kind of drive also becomes.III, the driving mechanism by complexity and use huge vertical rotation axis to come the transmission energy more in the past, the external rotor of the blade of the present invention design, the outer ring of bearing and the generator structure in aggregates that interfixes, make generator amature be equivalent to the part of blade, the rotating speed of blade is exactly the rotating speed of generator amature, greatly reduced the loss of energy in transmission course, quite high to utilization ratio of wind energy.IV, more existing tower-type vertical wind power generator, the present invention had both guaranteed the firm of wind-driven generator by hollow king-post supporting electricity generating device, had reduced the consumption of steel again; And the present invention has effectively simplified complicated in the past driving mechanism, has greatly reduced the cost of production of vertical wind power generator and the cost of wind-powered electricity generation.VI, because king-post of the present invention is hollow, and be provided with elevator in king-post inside and be provided with suspension bracket at the king-post top, make that maintenance and the detection to vertical wind power generator becomes simple and safe.
Description of drawings
Fig. 1 is a vertical wind power generator plan view among the embodiment 1;
Fig. 2 is the sectional view of Fig. 1;
Fig. 3 is the 3-D view of Fig. 1;
Fig. 4 is a vertical wind power generator plan view among the embodiment 2;
Fig. 5 is the sectional view of Fig. 4;
Fig. 6 is the 3-D view of Fig. 5;
Fig. 7 is a vertical wind power generator plan view among the embodiment 3;
Fig. 8 is the sectional view of Fig. 7;
Fig. 9 is the 3-D view of Fig. 7;
Figure 10 is a vertical wind power generator plan view among the embodiment 4;
Figure 11 is the sectional view of Figure 10;
Figure 12 is the 3-D view of Figure 10.
Embodiment
The invention will be further described below in conjunction with Figure of description.
As shown in Figures 1 to 3, a kind of vertical wind power generator comprises king-post 1, generator and two blades 9; Described king-post 1 is hollow, is provided with electricity generating device on described king-post 1.Described electricity generating device is made up of the first lower flange 2a and the first upper flange plate 2b, clutch shaft bearing seat 3, clutch shaft bearing 44, first generator 5, generator newel 20, second bearing 7, second bearing support 8, the second lower flange 11a and the second upper flange plate 11b that are arranged on the king-post 1; Described first lower flange 2a and king-post 1 fix, the described first upper flange plate 2b is positioned at the first lower flange 2a and upward and with the first lower flange 2a fixedlys connected, described clutch shaft bearing seat 3 is fixed on the first upper flange plate 2b, described clutch shaft bearing 4 is made of first outer ring 41, the first steel ball group 42 and first inner ring 43, described first inner ring 43 is fixed on the clutch shaft bearing seat 3, and described first outer ring 41 and the first steel ball group 42 can be rotated around first inner ring 43; Described first generator 5 comprises first inner stator 51 and first external rotor 52, and described first inner stator 51 is positioned on first inner ring 43, and described first external rotor 52 is positioned on first outer ring 41 and with first outer ring 41 fixedlys connected; Described generator newel 20 is hollow, and described generator newel 20 is arranged in first inner stator 51, and described generator newel 20 is fixedlyed connected with first inner stator 51; Above described generator newel 20, be provided with second bearing 7 successively, second bearing support 8, the second lower flange 11a and the second upper flange plate 11b, described second upper flange plate 11b and king-post 1 fix, the described second lower flange 11a is positioned at second upper flange plate 11b below and fixedlys connected with the second upper flange plate 11b, described second bearing support 8 is positioned at second lower flange 11a below and fixedlys connected with the second lower flange 11a, described second bearing 7 is by second outer ring 71, the second steel ball group 72 and second inner ring 73 constitute, described second inner ring 73 is positioned at second bearing support, 8 belows and fixedlys connected with second bearing support 8, and described second outer ring 71 and the second steel ball group 72 can be rotated around second inner ring 73.Being provided with the first adpting flange 6a between the lower end of described first outer ring 41 and blade 9, fixedlys connected with first outer ring 41 by the first adpting flange 6a in the lower end of described blade 9; Being provided with the second adpting flange 6b between the upper end of described second outer ring 71 and blade 9, fixedlys connected with second outer ring 71 by the second adpting flange 6b in the upper end of described blade 9.Be provided with the speed reducer (not shown) that reduces by second outer ring, 71 rotating speeds in the present invention on described second bearing 7, the speed reducer (not shown) acts directly on second outer ring 71 of second bearing 7.Be provided with suspension bracket 10 at described king-post 1 top, described suspension bracket 10 is articulated with king-post 1 top, described suspension bracket 10 is provided with arm 101, hoisting apparatus (not shown) and suspension hook 102, the hoisting apparatus (not shown) is connected with suspension hook 102, by the lifting of hoisting apparatus (not shown) realization to suspension hook 102.Be provided with elevator in described king-post 1 inside, described elevator comprises car 12a and car elevator mechanism 12b, and car 12a realizes lifting by car elevator mechanism 12b.
The working principle of vertical wind power generator is as follows:
Wind-force promotes blade 9, blade 9 is stressed and begin rotation, because blade 9 is fixedlyed connected with second outer ring 71 with first outer ring 41 with the second adpting flange 6b by the first adpting flange 6a, blade 9 can be with first outer ring 41 and second outer ring 71 to rotate together, and first inner ring 43, second inner ring 73 then fix with the clutch shaft bearing seat 3 and second bearing support 8 respectively.In addition, first inner stator 51 of first generator 55 fixes with generator newel 20, and generator newel 20 fixes with the clutch shaft bearing seat 3 and first outer ring 41; First external rotor 52 and first outer ring 41 are fixing, and blade 9 has also driven first generator, 5 first external rotors 52 and rotated when driving 41 rotations of first outer ring.Blade 9, first outer ring 41, second outer ring 71 and first external rotor 52 become an overall structure, have identical rotating speed, and blade 9 changes soon more, and first generator, 5 rotors just change soon more.Because its power chain is simple, the loss of energy is few, to the utilization ratio of wind energy height.Too high in order to prevent first generator, 5 rotor speeds, the speed reducer (not shown) can slow down to second outer ring 71 of second bearing 7, thereby reaches the purpose to first external rotor, 52 decelerations of first generator 5.For the detection and the maintenance of vertical wind-force first generator 5, the maintenance management personnel can carry out detection and the maintenance to wind-driven generator by the car 12a that takes elevator.In addition, can use suspension bracket 10 lifting part and maintenance man when maintenance or replacing parts, make maintenance become more convenient.
Embodiment 2
As shown in Figs. 4-6, a kind of vertical wind power generator comprises king-post 1, generator and two blades 9; Described king-post 1 is hollow, is provided with electricity generating device on described king-post 1.Described electricity generating device is made up of the first lower flange 2a and the first upper flange plate 2b, clutch shaft bearing seat 3, clutch shaft bearing 4, first generator 5, generator newel 20, second bearing 7, second bearing support 8, the second lower flange 11a and the second upper flange plate 11b that are arranged on the king-post 1; Described first lower flange 2a and king-post 1 fix, the described first upper flange plate 2b is positioned at the first lower flange 2a and upward and with the first lower flange 2a fixedlys connected, described clutch shaft bearing seat 3 is fixed on the first upper flange plate 2b, described clutch shaft bearing 4 is made of first outer ring 41, the first steel ball group 42 and first inner ring 43, described first inner ring 43 is fixed on the clutch shaft bearing seat 3, and described first outer ring 41 and the first steel ball group 42 can be rotated around first inner ring 43; Described first generator 5 comprises first inner stator 51 and first external rotor 52, and described first inner stator 51 is positioned on first inner ring 43, and described first external rotor 52 is positioned on first outer ring 41 and with first outer ring 41 fixedlys connected; Described generator newel 20 is hollow, and described generator newel 20 is arranged in first inner stator 51, and described generator newel 20 is fixedlyed connected with first inner stator 51; Above described generator newel 20, be provided with second bearing 7 successively, second bearing support 8, the second lower flange 11a and the second upper flange plate 11b, described second upper flange plate 11b and king-post 1 fix, the described second lower flange 11a is positioned at second upper flange plate 11b below and fixedlys connected with the second upper flange plate 11b, described second bearing support 8 is positioned at second lower flange 11a below and fixedlys connected with the second lower flange 11a, described second bearing 7 is by second outer ring 71, the second steel ball group 72 and second inner ring 73 constitute, described second inner ring 73 is positioned at second bearing support, 8 belows and fixedlys connected with second bearing support 8, and described second outer ring 71 and the second steel ball group 72 can be rotated around second inner ring 73.Be provided with second generator 13 below described second bearing 7, described second generator 13 comprises second inner stator 131 and second external rotor 132; Described second inner stator 131 is positioned at second bearing, 7 inner rings below, and described second inner stator 131 is fixedlyed connected with generator newel 20; Described second external rotor 132 is positioned at below, second bearing, 7 outer rings and fixedlys connected with the outer ring.Being provided with the first adpting flange 6a between the lower end of described first outer ring 41 and blade 9, fixedlys connected with first outer ring 41 by the first adpting flange 6a in the lower end of described blade 9; Being provided with the second adpting flange 6b between the upper end of described second outer ring 71 and blade 9, fixedlys connected with second outer ring 71 by the second adpting flange 6b in the upper end of described blade 9.Be provided with the speed reducer (not shown) that reduces by second outer ring, 71 rotating speeds in the present invention on described second bearing 7, the speed reducer (not shown) acts directly on second outer ring 71 of second bearing 7.Be provided with suspension bracket 10 at described king-post 1 top, described suspension bracket 10 is articulated with king-post 1 top, described suspension bracket 10 is provided with arm 101, hoisting apparatus (not shown) and suspension hook 102, the hoisting apparatus (not shown) is connected with suspension hook 102, by the lifting of hoisting apparatus (not shown) realization to suspension hook 102.Be provided with elevator in described king-post 1 inside, described elevator comprises car 12a and car elevator mechanism 12b, and car 12a realizes lifting by car elevator mechanism 12b.
As shown in Figs. 7-9, different is with embodiment 1: king-post 11 is provided with two electricity generating device unit, and the electricity generating device that is positioned at lower floor comprises that the first lower flange 2a and the first upper flange plate 2b, clutch shaft bearing seat 3, clutch shaft bearing 4, first generator 5, generator newel 20, second bearing 7, second bearing support 8, the second lower flange 11a and the second upper flange plate 11b form.The electricity generating device that is positioned at the electricity generating device on upper strata and lower floor is structurally identical.The electricity generating principle of two electricity generating devices is the same with the electricity generating principle of embodiment's 1 described electricity generating device, no longer describes in detail here.
Shown in Figure 10 to 12, different is with embodiment 2: king-post 11 is provided with two electricity generating device, and the electricity generating device that is arranged in lower floor comprises that the first lower flange 2a and the first upper flange plate 2b, clutch shaft bearing seat 3, clutch shaft bearing 4, first generator 5, generator newel 20, second bearing 7, second bearing support 8, the second lower flange 11a and the second upper flange plate 11b form; And be provided with second generator 13 below second bearing 7, described second generator 13 comprises second inner stator 131 and second external rotor 132.The electricity generating device that is positioned at the electricity generating device on upper strata and lower floor is structurally identical.The electricity generating principle of two electricity generating devices is the same with the electricity generating principle of embodiment's 2 described electricity generating devices, no longer describes in detail here.
Claims (6)
1. a vertical wind power generator comprises king-post, generator and the blade more than two, it is characterized in that: described king-post is hollow, is provided with more than one electricity generating device on described king-post; Described electricity generating device is made up of first lower flange and first upper flange plate, clutch shaft bearing seat, clutch shaft bearing, first generator, generator newel, second bearing, second bearing support, second lower flange and second upper flange plate that are arranged on the king-post;
Described first lower flange and king-post fix, described first upper flange plate is positioned on first lower flange and with first lower flange fixedlys connected, described clutch shaft bearing seat is fixed on first upper flange plate, described clutch shaft bearing is made of first outer ring, the first steel ball group and first inner ring, described first inner ring is fixed on the clutch shaft bearing seat, and described first outer ring and the first steel ball group can be rotated around first inner ring;
Described first generator comprises first inner stator and first external rotor, and described first inner stator is positioned on first inner ring, and described first external rotor is positioned on first outer ring and with first outer ring fixedlys connected;
Described generator newel is hollow, and described generator newel is arranged in first inner stator, and described generator newel is fixedlyed connected with first inner stator;
Above described generator newel, be provided with second bearing successively, second bearing support, second lower flange and second upper flange plate, described second upper flange plate and king-post fix, described second lower flange is positioned at second upper flange plate below and fixedlys connected with second upper flange plate, described second bearing seat is fixedlyed connected in second lower flange below and with second lower flange, described second bearing is by second outer ring, the second steel ball group and second inner ring constitute, described second inner ring is positioned at second bearing support below and fixedlys connected with second bearing support, and described second outer ring and the second steel ball group can be rotated around second inner ring;
Fixedlying connected with second outer ring in the upper end of described blade, fixedlys connected with first outer ring in the lower end of described blade.
2. a kind of vertical wind power generator according to claim 1 is characterized in that: being provided with first adpting flange between the lower end of described first outer ring and blade, fixedlys connected with first outer ring by first adpting flange in the lower end of described blade; Being provided with second adpting flange between the upper end of described second outer ring and blade, fixedlys connected with second outer ring by second adpting flange in the upper end of described blade.
3. a kind of vertical wind power generator according to claim 1 is characterized in that: the described clutch shaft bearing or second bearing are provided with the speed reducer that reduces by first outer ring or the second outer ring rotating speed.
4. a kind of vertical wind power generator according to claim 1 is characterized in that: described second bearing below is provided with second generator, and described second generator comprises second inner stator and second external rotor; Described second inner stator is positioned at second bearing inner race below, and described second inner stator is fixedlyed connected with the generator newel; Described second external rotor is positioned at second bearing outer ring below and fixedlys connected with the outer ring.
5. a kind of vertical wind power generator according to claim 1 is characterized in that: described king-post top is provided with suspension bracket, and described suspension bracket and king-post top are articulated, and described suspension bracket is provided with arm, hoisting apparatus and suspension hook.
6. a kind of vertical wind power generator according to claim 1 is characterized in that: described king-post inside is provided with elevator, and described elevator comprises car and car elevator mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100381229A CN101545452B (en) | 2009-03-25 | 2009-03-25 | Vertical wind-powered generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100381229A CN101545452B (en) | 2009-03-25 | 2009-03-25 | Vertical wind-powered generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101545452A CN101545452A (en) | 2009-09-30 |
| CN101545452B true CN101545452B (en) | 2011-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100381229A Expired - Fee Related CN101545452B (en) | 2009-03-25 | 2009-03-25 | Vertical wind-powered generator |
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| Country | Link |
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| CN (1) | CN101545452B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102251937B (en) * | 2011-06-30 | 2013-03-13 | 邓允河 | Device and method for avoiding stall caused by strong wind in vertical axis wind turbine |
| CN202348569U (en) * | 2011-08-11 | 2012-07-25 | 邓允河 | Vertical axis wind generator |
| WO2013053251A1 (en) * | 2011-10-14 | 2013-04-18 | Deng Yunhe | Verticalshaft wind motor |
| CN102425529B (en) * | 2011-10-29 | 2013-12-11 | 邓允河 | Field installation method for vertical-shaft wind-driven generator |
| CN105888985A (en) * | 2016-01-18 | 2016-08-24 | 杨建文 | Mountain blocking frame construction type wind power generation device |
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2009
- 2009-03-25 CN CN2009100381229A patent/CN101545452B/en not_active Expired - Fee Related
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| CN101545452A (en) | 2009-09-30 |
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Address after: 510800 201 Mall, No. 11 Guanghua Sixth Road, Huadu District, Guangzhou City, Guangdong Province Patentee after: GUANGZHOU YATU NEW ENERGY TECHNOLOGY Co.,Ltd. Address before: 510460 Guangdong city of Guangzhou Province Yao town of Huadu District Ya Yuan Road No. 1 Patentee before: Guangzhou Yatu Wind Power Equipment Manufacturing Co.,Ltd. |
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Granted publication date: 20110420 |