CN110285014A - Independent pitch blade - Google Patents
Independent pitch blade Download PDFInfo
- Publication number
- CN110285014A CN110285014A CN201910591304.2A CN201910591304A CN110285014A CN 110285014 A CN110285014 A CN 110285014A CN 201910591304 A CN201910591304 A CN 201910591304A CN 110285014 A CN110285014 A CN 110285014A
- Authority
- CN
- China
- Prior art keywords
- blade
- cylinder barrel
- air cylinder
- root
- independent pitch
- 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.)
- Pending
Links
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 230000005484 gravity Effects 0.000 claims abstract description 8
- 230000005764 inhibitory process Effects 0.000 abstract description 2
- 238000010408 sweeping Methods 0.000 description 11
- 238000013461 design Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 241000283216 Phocidae Species 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 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
- 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
- F03D7/024—Adjusting aerodynamic properties of the blades of individual blades
-
- 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
Abstract
The invention discloses a kind of independent pitch blades, comprising: root of blade, is cylindrical body, and the open-ended sealing of the root of blade is in movement；Air cylinder barrel, on its wheel hub for fixing to wind energy conversion system, the open at one end of air cylinder barrel, the cylindrical body of root of blade are slidably matched with the internal chamber wall sealing of air cylinder barrel, and the blade of wind energy conversion system drives root of blade intracavitary flexible in air cylinder barrel in rotary course by self gravity；And blade pitch device comprising for connecting the screw drives component of root of blade Yu air cylinder barrel, when root of blade is intracavitary flexible in air cylinder barrel, the automatic driving blade of screw drives component is reversed relative to air cylinder barrel.The independent pitch blade can reliable low cost inhibition alternating load.
Description
Technical field
The present invention relates to wind energy conversion systems, more particularly to a kind of independent pitch blade.
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 independent pitch blades, can reliable low cost inhibition alternating load.
To achieve the above object, the present invention provides a kind of independent pitch blades, comprising: and root of blade is cylindrical body,
The open-ended sealing of the root of blade is in movement；Air cylinder barrel, for fixing on the wheel hub of wind energy conversion system, air cylinder
The open at one end of cylinder, the cylindrical body of root of blade are slidably matched with the internal chamber wall sealing of air cylinder barrel, and the blade of wind energy conversion system is revolving
Drive root of blade intracavitary flexible in air cylinder barrel by self gravity during turning；And blade pitch device comprising be used to
The screw drives component for connecting root of blade and air cylinder barrel, when root of blade is intracavitary flexible in air cylinder barrel, spiral is driven
The automatic driving blade of dynamic component is reversed relative to air cylinder barrel.Since air cylinder barrel is for fixing on the wheel hub of wind energy conversion system, leaf
It, can be with by connecting the screw drives component of root of blade and air cylinder barrel when piece root is intracavitary flexible in air cylinder barrel
The automatic torsion for realizing blade relative atmospheric cylinder barrel.
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, helicla flute is molded over the inside of cylinder, and what cylinder was fixed on air cylinder barrel inside contracts extension
On.
Optional or preferred, the open-ended of root of blade is sealed by installing sealing plate.
Optional or preferred, the open end of air cylinder barrel, which extends, cylinder, and helicla flute is located on the wall of cylinder, spiral
Slot penetrates through the wall of cylinder, and sliding block is slidably matched after passing through helicla flute with helicla flute.
Optional or preferred, screw drives component includes at least two spiral spokes and at least two sliding blocks, spiral spoke
Item is located at the open end of air cylinder barrel, and sliding block is fixed on root of blade, and two sliding blocks, which respectively correspond, is fastened on two spiral spokes
Inner side and outer side.
Optional or preferred, screw drives component includes at least two spiral spokes and at least one sliding block, spiral spoke
Item is located at the open end of air cylinder barrel, and sliding block is fixed on root of blade, and sliding block is fastened in the sliding rail between two spiral spokes.
Optional or preferred, the open end of air cylinder barrel, which extends, track support, and at least two spiral spokes are formed
On track support.
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 cooperates, and the blade of wind energy conversion system drives root of blade in air cylinder barrel in rotary course by self gravity
It is interior intracavitary flexible, when stretching, the automatic driving blade torsion of blade pitch device.That is, in blade rotary course, it can be heavy at its
Under the action of power and cylinder barrel internal and external pressure difference, the flexible and torsion of limited travel is carried out, so-called torsion i.e. adjustment pitch angle is realized
There are larger wind sweeping area, larger pitch angle in the sweeping area of lower wind speed, increases and catch wind energy power, and scanning in higher wind
There are smaller wind sweeping area, smaller pitch angle in region, and limitation catches wind load, achievees the effect that load equalization.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of independent pitch blade provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of blade pitch device in a kind of independent pitch blade provided in an embodiment of the present invention；
Fig. 3 is another structural schematic diagram of blade pitch device in a kind of independent pitch blade provided in an embodiment of the present invention.
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 independent pitch blade provided in an embodiment of the present invention, comprising: root of blade D, air cylinder barrel E
And blade pitch device, root of blade D are cylindrical body, the open-ended sealing of root of blade D is in movement, air cylinder barrel E
For fixing on the wheel hub of wind energy conversion system, the open at one end of air cylinder barrel E, the cylindrical body of root of blade and the inner cavity of air cylinder barrel
Wall sealing is slidably matched, and the blade A of wind energy conversion system drives root of blade D air cylinder barrel E's in rotary course by self gravity
It is interior intracavitary flexible.Core is to design blade pitch device comprising for connecting the screw drives portion of root of blade Yu air cylinder barrel
Part, when root of blade is intracavitary flexible in air cylinder barrel, the automatic driving blade of screw drives component is turned round relative to air cylinder barrel
Turn.Since air cylinder barrel is for fixing on the wheel hub of wind energy conversion system, when root of blade is intracavitary flexible in air cylinder barrel, pass through
The screw drives component for connecting root of blade and air cylinder barrel, can be realized automatically the torsion of blade relative atmospheric cylinder barrel.
Referring to fig. 2, the present embodiment provides a kind of specific blade pitch device, screw drives component includes helicla flute B and sliding block
C, helicla flute B are located at the open end of air cylinder barrel, and sliding block C is fixed on root of blade position corresponding with helicla flute, sliding block and spiral shell
Spin slot is slidably matched.Further, the open end of air cylinder barrel, which extends, cylinder, and helicla flute is located on the wall of cylinder, spiral
Slot penetrates through the wall of cylinder, and sliding block is slidably matched after passing through helicla flute with helicla flute.
As shown in figure 3, screw drives component can also design as follows, that is, it include at least two spiral spokes 31 and at least two
A sliding block 32, spiral spoke 31 are located at the open end of air cylinder barrel, and sliding block 32 is fixed on root of blade, and two sliding blocks 32 are right respectively
The inner side and outer side of two spiral spokes 31 should be fastened on.Further, the open end of air cylinder barrel, which extends, track support,
At least two spiral spokes are formed on in-orbit road bracket.In this way, by the inner side and outer side of at least two spiral spokes 31 point
Two sliding blocks 32 Dui Ying not engaged, when blade stretches, blade can be by being located at the mutual of sliding block thereon and spiral spoke
Torsion is realized in effect.
In addition, screw drives component can also design as follows, i.e., screw drives component include at least two spiral spokes and
At least one sliding block, spiral spoke are located at the open end of air cylinder barrel, and sliding block is fixed on root of blade, and sliding block is fastened on two spiral shells
It revolves in the sliding rail between spoke.Here, the open end of air cylinder barrel, which extends, track support, and at least two spiral spokes are formed
On track support.
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 air cylinder barrel connection blade flange or replace flange (special-shaped flange) connection blade and wheel hub,
In blade rotary course, the flexible of limited travel can be carried out under the action of its gravity and cylinder barrel internal and external pressure difference, meanwhile, become
The automatic driving blade A of paddle mechanism is reversed and variable pitch, and 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.
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.
Specific embodiment as one preferred, the open-ended of root of blade have expansion shape extension, expand shape extension
It is fitted on the inner wall of air cylinder barrel E, the open end of air cylinder barrel E, which has, inside contracts extension, inside contracts extension and is fitted in blade
The cylindrical body surface of root D expands the joint place of shape extension and air cylinder barrel, inside contracts the cylindrical body of extension and root of blade D
The joint place on surface is equipped with sealing ring.
Specific embodiment as one preferred, helicla flute are molded on the wall of cylinder, and cylinder is fixed on air cylinder barrel
It inside contracts on extension.
Specific embodiment as one preferred, the open-ended of root of blade D are sealed by installation sealing plate 12.
To sum up, the independent pitch blade of the present embodiment seals root end by improving at blade root to fan blade
Portion increases leaf root part rigidity, wearability, reduces roughness, and using air cylinder barrel connection blade flange or replace flange (different
Shape flange) connection blade and wheel hub, in blade rotary course, can under the action of its gravity and cylinder barrel internal and external pressure difference, into
The flexible and torsion of row limited travel, realizing has larger wind sweeping area, larger pitch angle in the sweeping area of lower wind speed, increases
Wind energy power is caught, and has smaller wind sweeping area, smaller pitch angle in the sweeping area of higher wind, wind load is caught in limitation, reaches load
The effect of lotus equilibrium.This structure does not consume external energy, and high reliablity can reduce 10% or more the peak-valley difference of loading period, from
And reduce alternating load, extend 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 (10)
1. a kind of independent pitch blade characterized by comprising
Root of blade, is cylindrical body, and the open-ended sealing of the root of blade is in movement；
Air cylinder barrel, for fixing on the wheel hub of wind energy conversion system, the open at one end of the air cylinder barrel, the root of blade
Cylindrical body and the internal chamber wall sealing of the air cylinder barrel are slidably matched, and the blade of wind energy conversion system leans on self gravity band in rotary course
It is intracavitary flexible in the air cylinder barrel to move the root of blade；And
Blade pitch device comprising for connecting the screw drives component of the root of blade Yu the air cylinder barrel, the blade
When root is intracavitary flexible in the air cylinder barrel, the screw drives component drives the blade relative to the sky automatically
Cylinder barrel torsion.
2. independent pitch blade according to claim 1, which is characterized in that the cylindrical body surface of the root of blade and institute
The internal chamber wall for stating air cylinder barrel is equipped with sealing ring.
3. independent pitch blade according to claim 1, which is characterized in that the open-ended of the root of blade has expansion
Shape extension, the expansion shape extension are fitted on the inner wall of the air cylinder barrel, and the open end of the air cylinder barrel has interior
Contracting extension, the cylindrical body surface for inside contracting extension and being fitted in the root of blade, the expansion shape extension and the sky
The joint place of cylinder barrel, the cylindrical body surface for inside contracting extension and the root of blade joint place be equipped with the sealing
Ring.
4. independent pitch blade according to claim 3, which is characterized in that the helicla flute is molded over the inside of cylinder,
The cylinder is fixed on the inside contracting on extension of the air cylinder barrel.
5. independent pitch blade according to claim 1, which is characterized in that the open-ended of the root of blade passes through peace
It fills sealing plate and seals.
6. independent pitch blade according to claim 1, which is characterized in that the screw drives component include helicla flute and
Sliding block, the helicla flute are located at the open end of the air cylinder barrel, and the sliding block is fixed on the root of blade and the spiral
The corresponding position of slot, the sliding block and the helicla flute are slidably matched.
7. independent pitch blade according to claim 6, which is characterized in that the open end of the air cylinder barrel, which extends, to be had
Cylinder, the helicla flute are located on the wall of the cylinder, and the helicla flute penetrates through the wall of the cylinder, and the sliding block passes through described
It is slidably matched after helicla flute with the helicla flute.
8. independent pitch blade according to claim 1, which is characterized in that the screw drives component includes at least two
Spiral spoke and at least two sliding blocks, the spiral spoke are located at the open end of the air cylinder barrel, and the sliding block is fixed on institute
Root of blade is stated, two sliding blocks respectively correspond the inner side and outer side for being fastened on described two spiral spokes.
9. blade independent pitch device according to claim 1, which is characterized in that the screw drives component includes at least
Two parallel spiral spokes, form sliding rail therebetween, and the sliding block is fastened on the sliding rail formed between described two spiral spokes
It is interior.
10. independent pitch blade according to claim 8 or claim 9, which is characterized in that the open end of the air cylinder barrel extends
There is track support out, at least two spiral spokes are formed on the track support.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910591304.2A CN110285014A (en) | 2019-07-02 | 2019-07-02 | Independent pitch blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910591304.2A CN110285014A (en) | 2019-07-02 | 2019-07-02 | Independent pitch blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110285014A true CN110285014A (en) | 2019-09-27 |
Family
ID=68020299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910591304.2A Pending CN110285014A (en) | 2019-07-02 | 2019-07-02 | Independent pitch blade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110285014A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4778344A (en) * | 1985-09-20 | 1988-10-18 | Abraham Water | Variable pitch mechanisms |
| US20110211957A1 (en) * | 2010-02-26 | 2011-09-01 | Mark Folsom | Self regulating wind turbine |
| US20120141267A1 (en) * | 2010-12-03 | 2012-06-07 | Michael Ching Kwei Kang | Wind turbine blade automatic pitch control using centrifugal force |
| CN103352801A (en) * | 2013-07-09 | 2013-10-16 | 张成革 | Centrifugal variable-pitch wind driven generator |
| CN103742362A (en) * | 2014-01-15 | 2014-04-23 | 北京金风科创风电设备有限公司 | Independent variable pitch control system and method for direct-drive permanent magnet wind generating set |
| US20140219797A1 (en) * | 2013-01-15 | 2014-08-07 | Envision Energy (Denmark) Aps | Partial pitch wind turbine with floating foundation |
| CN105539837A (en) * | 2015-12-30 | 2016-05-04 | 王伟 | Propeller capable of changing pitch automatically and rotorcraft capable of changing pitch automatically |
| WO2019056892A1 (en) * | 2017-09-25 | 2019-03-28 | Qingdao Randall Aerodynamic Engineering, Llc | Pitch control system |
| CN210948979U (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 | Independent variable-pitch blade |
-
2019
- 2019-07-02 CN CN201910591304.2A patent/CN110285014A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4778344A (en) * | 1985-09-20 | 1988-10-18 | Abraham Water | Variable pitch mechanisms |
| US20110211957A1 (en) * | 2010-02-26 | 2011-09-01 | Mark Folsom | Self regulating wind turbine |
| US20120141267A1 (en) * | 2010-12-03 | 2012-06-07 | Michael Ching Kwei Kang | Wind turbine blade automatic pitch control using centrifugal force |
| US20140219797A1 (en) * | 2013-01-15 | 2014-08-07 | Envision Energy (Denmark) Aps | Partial pitch wind turbine with floating foundation |
| CN103352801A (en) * | 2013-07-09 | 2013-10-16 | 张成革 | Centrifugal variable-pitch wind driven generator |
| CN103742362A (en) * | 2014-01-15 | 2014-04-23 | 北京金风科创风电设备有限公司 | Independent variable pitch control system and method for direct-drive permanent magnet wind generating set |
| CN105539837A (en) * | 2015-12-30 | 2016-05-04 | 王伟 | Propeller capable of changing pitch automatically and rotorcraft capable of changing pitch automatically |
| WO2019056892A1 (en) * | 2017-09-25 | 2019-03-28 | Qingdao Randall Aerodynamic Engineering, Llc | Pitch control system |
| CN210948979U (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 | Independent variable-pitch blade |
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