CN110242500A - Wind energy conversion system vane change device - Google Patents
Wind energy conversion system vane change device Download PDFInfo
- Publication number
- CN110242500A CN110242500A CN201910591649.8A CN201910591649A CN110242500A CN 110242500 A CN110242500 A CN 110242500A CN 201910591649 A CN201910591649 A CN 201910591649A CN 110242500 A CN110242500 A CN 110242500A
- Authority
- CN
- China
- Prior art keywords
- blade
- air cylinder
- cylinder barrel
- root
- wind energy
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 35
- 230000008859 change Effects 0.000 title claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 21
- 230000005484 gravity Effects 0.000 claims abstract description 10
- 230000007246 mechanism Effects 0.000 claims abstract description 5
- 238000010408 sweeping Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor
- F03D1/06—Rotors
- F03D1/065—Rotors characterised by their construction elements
- F03D1/0675—Rotors characterised by their construction elements of the blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/022—Adjusting aerodynamic properties of the blades
- F03D7/0224—Adjusting blade pitch
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2270/00—Control
- F05B2270/60—Control system actuates through
- F05B2270/605—Control system actuates through pneumatic actuators
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Wind Motors (AREA)
Abstract
The invention discloses a kind of wind energy conversion system vane change devices, comprising: root of blade is cylindrical body, the open-ended sealing of the root of blade；Air cylinder barrel, for fixing on the wheel hub of wind energy conversion system, one end of the both ends open of air cylinder barrel, the internal chamber wall of air cylinder barrel is cooperated by helicla flute and helical guideway structure and the cylindrical body of root of blade；Relief piston is located at the other end of the internal chamber wall of air cylinder barrel, so that the sealing end of root of blade and relief piston surround sealing space in the inside of air cylinder barrel；And driving mechanism, it is used to that relief piston is driven to stretch in the other end of air cylinder barrel and then is used to adjust the pressure in air cylinder barrel, the blade of wind energy conversion system drives root of blade intracavitary flexible in air cylinder barrel in rotary course under gas pressure in self gravity and air cylinder barrel, when flexible, helicla flute and the automatic driving blade torsion of helical guideway structure.The wind energy conversion system vane change device can reliably inhibit alternating load.
Description
Technical field
The present invention relates to wind energy conversion systems, more particularly to a kind of wind energy conversion system vane change device.
Background technique
As renewable green energy resource, wind energy conversion system need to only utilize the kinetic energy of wind.Wind energy utilization cost is mainly by manufacturing, installing
It is formed in terms of debugging, operation and maintenance three.The Lean Manufacturing wherein equipped is basis, from the cost consideration of wind energy conversion system, is improved economical
Property can set about from two kinds of Technology Ways, first is that Fine design reduce main component cost, besides extend critical component fortune
The row service life.In-service blade technology for accounting for complete machine cost 20% is transformed, and the latter is more feasible mode.
The projected life of wind energy conversion system, by taking 2MW unit as an example, blade will rotate in its life cycle management at 20 years or more
About 108Cycle magnitude, in the gravity, wind shear, yaw error, axis warpage, pylon interference, turbulent flow for being subject to alternation each week
Effect.Therefore, in vane design of wind turbines, fatigue load is very important factor, significance level even can and pole
Ultimate load caused by limit wind speed is compared.
The control system of trunnion axis upwind wind energy conversion system is generally based on sensor, controller and the active of executing agency control
System.Sensor measurement wind speed and direction, wheel speed, output power or torque；Executing agency adjust motor torque, propeller pitch angle and partially
Boat angle etc.；And both controller connections, and drive executing agency to carry out necessity to the result that sensor measures by control algolithm
Reaction, be optimal power or load etc. control target.
However, the system based on unified variable propeller pitch cannot be good for blade alternating load caused by wind shear induction
Control the load fluctuation.For this purpose, the control system of some reinforcings introduces blade root moment of flexure sensor and uses blade independent pitch
Method reduces alternating load caused by wind shear.In recent years, this independent pitch system also introduces real-time inflow velocity measurement
Technology, such as LDV technique, acoustics windfinding radar.Alternating load can be effectively reduced in independent pitch control method really, but
Corresponding cost is also higher, because it increases variable pitch frequency, and greatly improved the requirement of sensor and executing agency,
Inhibit alternating load at high cost.
Summary of the invention
The purpose of the present invention is to provide a kind of wind energy conversion system vane change devices, can reliably inhibit alternating load.
To achieve the above object, the present invention provides a kind of wind energy conversion system vane change devices, comprising: root of blade is cylindricality
Body, the open-ended sealing of the root of blade；Air cylinder barrel, for fixing on the wheel hub of wind energy conversion system, the two of air cylinder barrel
End is opened wide, and one end of the internal chamber wall of air cylinder barrel is cooperated by helicla flute and helical guideway structure and the cylindrical body of root of blade；
Relief piston is located at the other end of the internal chamber wall of air cylinder barrel, so that the sealing end and relief piston of root of blade
Sealing space is surrounded in the inside of air cylinder barrel；And driving mechanism, it is used to drive relief piston in the another of air cylinder barrel
Flexible in end to be used to adjust the pressure in air cylinder barrel in turn, the blade of wind energy conversion system leans on self gravity and air in rotary course
Drive root of blade intracavitary flexible in air cylinder barrel in cylinder barrel under gas pressure, when stretching, helicla flute and helical guideway knot
The automatic driving blade torsion of structure.
Optional or preferred, the cylindrical body surface of root of blade and the internal chamber wall of air cylinder barrel are equipped with sealing ring.
Optional or preferred, the open-ended of root of blade has expansion shape extension, expands shape extension and is fitted in air
On the inner wall of cylinder barrel, the open end of air cylinder barrel, which has, inside contracts extension, inside contracts the cylindrical body that extension is fitted in root of blade
Surface, expands shape extension and joint place, the joint place on the cylindrical body surface for inside contracting extension and root of blade of air cylinder barrel are equal
Equipped with sealing ring.
Optional or preferred, the open-ended of root of blade is sealed by installing sealing plate.
Optional or preferred, the cylindrical body of root of blade is equipped with helical guideway, and the internal chamber wall of air cylinder barrel is equipped with
Helicla flute.
Optional or preferred, the cylindrical body of root of blade is equipped with helicla flute, and the internal chamber wall of air cylinder barrel is equipped with spiral shell
Revolve guide rail.
Technical solution provided in an embodiment of the present invention has the benefit that through the cylindrical body and sky in root of blade
The internal chamber wall of cylinder barrel is cooperated by helicla flute and helical guideway structure, adjusts the pressure in air cylinder barrel in conjunction with relief piston,
In blade rotary course, the flexible and torsion of limited travel can be carried out under the action of its gravity and cylinder barrel internal and external pressure difference,
So-called torsion i.e. adjustment pitch angle, realizing has larger wind sweeping area, larger pitch angle in the sweeping area of lower wind speed, and increase is caught
Wind energy power, and have smaller wind sweeping area, smaller pitch angle in the sweeping area of higher wind, wind load is caught in limitation, reaches load
Balanced effect.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of wind energy conversion system vane change device provided in an embodiment of the present invention.
Fig. 2 is that helicla flute and the cooperation of helical guideway structure are shown in a kind of wind energy conversion system vane change device provided in an embodiment of the present invention
It is intended to.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description the invention and simplifies description, rather than indicate
Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand
For the limitation to the invention.
Term " installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, be also possible to removable
Connection is unloaded, or is integrally connected；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be in
Between medium be indirectly connected, can be the connection inside two elements.For the ordinary skill in the art, can pass through
Concrete condition understands concrete meaning of the above-mentioned term in the invention.
Further detailed description is done to the present invention combined with specific embodiments below, but embodiments of the present invention are not limited to
This.
As shown in Figure 1, a kind of wind energy conversion system vane change device provided in an embodiment of the present invention, comprising: root of blade 11, air cylinder
Cylinder 2, relief piston 3 and driving mechanism 4, root of blade 11 are cylindrical body, the open-ended sealing of the root of blade 11, air
Cylinder barrel 2 is for fixing on the wheel hub of wind energy conversion system, the open at one end of air cylinder barrel 2.Relief piston 3 is located at the air cylinder barrel 2
Internal chamber wall the other end so that the sealing end of the root of blade 11 and the relief piston 3 are in the air cylinder
The inside of cylinder 2 surrounds sealing space.Driving mechanism 4 is used to drive the relief piston 3 in the other end of the air cylinder barrel 2
Flexible to be used to adjust the pressure in the air cylinder barrel 2 in turn, the blade of wind energy conversion system leans on self gravity and institute in rotary course
It states and drives the root of blade 11 intracavitary flexible in the air cylinder barrel 2 in air cylinder barrel 2 under gas pressure, when stretching,
The helicla flute and helical guideway structure drive the blade twist to realize variable pitch automatically.Core is, the column of root of blade 11
The internal chamber wall of body and air cylinder barrel 2 is cooperated by helicla flute and helical guideway structure, and the blade 1 of wind energy conversion system is in rotary course
It is intracavitary flexible in air cylinder barrel 2 by the zone of action movable vane piece root 11 of self gravity and cylinder barrel internal and external pressure difference, when stretching,
Helicla flute and the automatic driving blade 1 of helical guideway structure are reversed.
In above scheme, blade is improved at blade root, seal blade root end, increases leaf root part rigidity, wear-resisting
Property, roughness is reduced, and using spiral of air cylinder barrel connection blade flange or replace flange (special-shaped flange) connection blade and wheel
Hub can carry out the flexible of limited travel and turn round in blade rotary course under the action of its gravity and cylinder barrel internal and external pressure difference
Turn, realizing has larger wind sweeping area, larger pitch angle in the sweeping area of lower wind speed, and wind energy power is caught in increase, and in higher wind
The sweeping area of speed has smaller wind sweeping area, smaller pitch angle, and limitation catches wind load, achievees the effect that load equalization.Meanwhile increasing
Relief piston and corresponding executing agency such as hydraulic cylinder, turbine worm, rack-and-pinion etc. is added to may be implemented flexibly to control, Ke Yike
By inhibiting alternating load.
Specific embodiment as one preferred is set on the cylindrical body surface of root of blade and the internal chamber wall of air cylinder barrel
There is sealing ring, in this way, can reinforce sealing with sealing elements such as sealing rings between air cylinder barrel and blade root.Certainly, root of blade
Helicla flute and helical guideway structure itself between 11 cylindrical body and the internal chamber wall of air cylinder barrel 2 also may be implemented to seal.
Specific embodiment as one preferred, the open-ended of root of blade have expansion shape extension 13, expand shape and extend
Section 13 is fitted on the inner wall of air cylinder barrel 2, and the open end of air cylinder barrel 2, which has, inside contracts extension 21, inside contracts the patch of extension 21
It closes and expands the joint place of shape extension 13 and air cylinder barrel on the cylindrical body surface of root of blade 11, inside contracts extension 21 and blade
The joint place on the cylindrical body surface of root 11 is equipped with sealing ring.
Specific embodiment as one preferred, the open-ended of root of blade 11 are sealed by welded seal plate 12.
As shown in Fig. 2, specific embodiment as one preferred, is the principle signal of helicla flute and helical guideway structure
Figure.The cylindrical body of root of blade 11 is equipped with helical guideway, and the internal chamber wall of air cylinder barrel 2 is equipped with helicla flute.Of course, it is possible to
The cylindrical body of root of blade is equipped with helicla flute 21, and the internal chamber wall of air cylinder barrel is equipped with helical guideway 22, and root of blade 11 is logical
Rotation is realized in the cooperation for crossing helicla flute 21 and helical guideway 22 when flexible.Since air cylinder barrel is for fixing to wind energy conversion system
Wheel hub on, the blade of wind energy conversion system is in rotary course described in drive under gas pressure in self gravity and the air cylinder barrel
While root of blade is intracavitary flexible in the air cylinder barrel, the blade of wind energy conversion system passes through helicla flute and helical guideway structure
Driving realize torsion.It should be noted that helical guideway can be according to the load-optimised design shape that needs, general blade is whole
The angle of torsion is not more than 10 degree.
To sum up, the wind energy conversion system vane change device of the present embodiment seals blade root by improving at blade root to fan blade
End increases leaf root part rigidity, wearability, reduces roughness, and using spiral of air cylinder barrel connection blade flange or replacement
Flange (special-shaped flange) connects blade and wheel hub can be in the work of its gravity and cylinder barrel internal and external pressure difference in blade rotary course
Under, the flexible and torsion of limited travel is carried out, realizing has larger wind sweeping area, larger pitch in the sweeping area of lower wind speed
Angle, wind energy power is caught in increase, and has smaller wind sweeping area, smaller pitch angle in the sweeping area of higher wind, and wind load is caught in limitation,
Achieve the effect that load equalization.This structural controllability, high reliablity can reduce 12% or more the peak-valley difference of loading period, thus
Reduce alternating load, extends leaf longevity.
Unless otherwise defined, the technical term or scientific term used herein should be in fields of the present invention and has
The ordinary meaning that the personage of general technical ability is understood.Used in the invention patent description of the invention and claims " the
One ", " second " and similar word are not offered as any sequence, quantity or importance, and are used only to distinguish different
Component part.Equally, the similar word such as "one" or " one " does not indicate that quantity limits yet, but indicates that there are at least one.
" connection " either the similar word such as " connected " is not limited to physics or mechanical connection, but may include electrical
Connection, it is either direct or indirect.
The foregoing is merely example embodiments of the present invention, are not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of wind energy conversion system vane change device characterized by comprising
Root of blade is cylindrical body, the open-ended sealing of the root of blade；
Air cylinder barrel, for fixing on the wheel hub of wind energy conversion system, the both ends open of the air cylinder barrel, the air cylinder barrel
One end of internal chamber wall is cooperated by helicla flute and helical guideway structure and the cylindrical body of the root of blade；
Relief piston is located at the other end of the internal chamber wall of the air cylinder barrel, so that the sealed end of the root of blade
Portion and the relief piston surround sealing space in the inside of the air cylinder barrel；And
Driving mechanism is used to that the relief piston is driven to stretch in the other end of the air cylinder barrel and then is used to adjust institute
State the pressure in air cylinder barrel, the blade of wind energy conversion system gas pressure in self gravity and the air cylinder barrel in rotary course
It is lower to drive the root of blade intracavitary flexible in the air cylinder barrel, when stretching, the helicla flute and helical guideway structure
Automatically the blade twist is driven.
2. wind energy conversion system vane change device according to claim 1, which is characterized in that the cylindrical body surface of the root of blade with
The internal chamber wall of the air cylinder barrel is equipped with sealing ring.
3. wind energy conversion system vane change device according to claim 1, which is characterized in that the open-ended of the root of blade has
Expand shape extension, the expansion shape extension is fitted on the inner wall of the air cylinder barrel, and the open end of the air cylinder barrel has
Inside contract extension, the cylindrical body surface for inside contracting extension and being fitted in the root of blade, the expansion shape extension with it is described
The joint place of air cylinder barrel, the cylindrical body surface for inside contracting extension and the root of blade joint place be equipped with it is described close
Seal ring.
4. wind energy conversion system vane change device according to claim 1, which is characterized in that the open-ended of the root of blade passes through
Sealing plate is installed and is sealed.
5. wind energy conversion system vane change device according to claim 1, which is characterized in that the cylindrical body of the root of blade is equipped with
The internal chamber wall of helical guideway, the air cylinder barrel is equipped with helicla flute.
6. wind energy conversion system vane change device according to claim 1, which is characterized in that the cylindrical body of the root of blade is equipped with
The internal chamber wall of helicla flute, the air cylinder barrel is equipped with helical guideway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910591649.8A CN110242500B (en) | 2019-07-02 | 2019-07-02 | Variable pitch device of wind turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910591649.8A CN110242500B (en) | 2019-07-02 | 2019-07-02 | Variable pitch device of wind turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110242500A true CN110242500A (en) | 2019-09-17 |
| CN110242500B CN110242500B (en) | 2024-08-16 |
Family
ID=67890795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910591649.8A Active CN110242500B (en) | 2019-07-02 | 2019-07-02 | Variable pitch device of wind turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110242500B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009076757A2 (en) * | 2007-12-14 | 2009-06-25 | David Mcconnell | Wind to electric energy conversion with hydraulic storage |
| CN102042176A (en) * | 2009-10-15 | 2011-05-04 | 梁启明 | Constant speed wind driven generator with self-adjusting blade angle |
| CN104411968A (en) * | 2012-06-04 | 2015-03-11 | 维斯塔斯风力系统集团公司 | Control system for a wind turbine |
| CN105539837A (en) * | 2015-12-30 | 2016-05-04 | 王伟 | Propeller capable of changing pitch automatically and rotorcraft capable of changing pitch automatically |
| CN206397660U (en) * | 2017-01-19 | 2017-08-11 | 三峡大学 | The horizontal-shaft wind turbine of blade length and variable-angle |
| WO2018127261A1 (en) * | 2017-01-05 | 2018-07-12 | Vestas Wind Systems A/S | Pitch adjustment cylinder for adjustment of a pitch angle of a blade of a wind turbine |
| CN210948986U (en) * | 2019-07-02 | 2020-07-07 | 中国大唐集团新能源科学技术研究院有限公司 | Wind turbine variable pitch device |
-
2019
- 2019-07-02 CN CN201910591649.8A patent/CN110242500B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009076757A2 (en) * | 2007-12-14 | 2009-06-25 | David Mcconnell | Wind to electric energy conversion with hydraulic storage |
| CN102042176A (en) * | 2009-10-15 | 2011-05-04 | 梁启明 | Constant speed wind driven generator with self-adjusting blade angle |
| CN104411968A (en) * | 2012-06-04 | 2015-03-11 | 维斯塔斯风力系统集团公司 | Control system for a wind turbine |
| CN105539837A (en) * | 2015-12-30 | 2016-05-04 | 王伟 | Propeller capable of changing pitch automatically and rotorcraft capable of changing pitch automatically |
| WO2018127261A1 (en) * | 2017-01-05 | 2018-07-12 | Vestas Wind Systems A/S | Pitch adjustment cylinder for adjustment of a pitch angle of a blade of a wind turbine |
| CN206397660U (en) * | 2017-01-19 | 2017-08-11 | 三峡大学 | The horizontal-shaft wind turbine of blade length and variable-angle |
| CN210948986U (en) * | 2019-07-02 | 2020-07-07 | 中国大唐集团新能源科学技术研究院有限公司 | Wind turbine variable pitch device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110242500B (en) | 2024-08-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DK178018B1 (en) | Hub for a wind turbine and method of mounting a wind turbine | |
| US8240995B2 (en) | Wind turbine, aerodynamic assembly for use in a wind turbine, and method for assembling thereof | |
| RU2362907C1 (en) | Method and device for kinetic power interchange with liquids | |
| US7901184B2 (en) | Torsionally loadable wind turbine blade | |
| US9109578B2 (en) | Root extender for a wind turbine rotor blade | |
| WO2009091782A1 (en) | Check valve turbine | |
| EP2497878A2 (en) | Flange and wind energy system | |
| CN109630612A (en) | Self-powered active and passive composite rotational inertia drive control system | |
| CN105781864A (en) | Tidal current energy power generation device and underwater sealing protective device thereof | |
| CN110374801A (en) | Blade root independent pitch device | |
| CN202266366U (en) | Horizontal shaft variable blade pitch tidal current energy water turbine | |
| CN110374794A (en) | Passive type independent pitch blade | |
| CN110230571A (en) | Blade independent pitch device | |
| CN110242500A (en) | Wind energy conversion system vane change device | |
| CN110374795A (en) | Scalable pneumatic equipment bladess | |
| CN210948986U (en) | Wind turbine variable pitch device | |
| CN110230572A (en) | Wind energy conversion system independent pitch device | |
| CN102135067A (en) | Circumferential inhaul cable structure of vertical axis wind turbine | |
| CN110285014A (en) | Independent pitch blade | |
| CN204330372U (en) | The Wind turbines fault simulation experiment table that a kind of inclined installation angle is adjustable | |
| CN210948979U (en) | Independent variable-pitch blade | |
| CN109611268B (en) | Design optimization method for double-impeller horizontal shaft wind turbine | |
| CN208416786U (en) | The wind turbines rotor of automatic variable pitch and disability protection | |
| WO2019111674A1 (en) | Vertical axis-type wind turbine | |
| CN101265880B (en) | Cyclone resisting vertical shaft wind motor based on vane corner control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |