CN110374801B - Blade root independent variable pitch device - Google Patents
Blade root independent variable pitch device Download PDFInfo
- Publication number
- CN110374801B CN110374801B CN201910591302.3A CN201910591302A CN110374801B CN 110374801 B CN110374801 B CN 110374801B CN 201910591302 A CN201910591302 A CN 201910591302A CN 110374801 B CN110374801 B CN 110374801B
- Authority
- CN
- China
- Prior art keywords
- air cylinder
- cylinder barrel
- blade root
- blade
- extension section
- 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.)
- Active
Links
- 238000007789 sealing Methods 0.000 claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims abstract description 16
- 230000005484 gravity Effects 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 6
- 230000009471 action Effects 0.000 claims abstract description 5
- 238000010408 sweeping Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000013461 design Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 206010066054 Dysmorphism Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000452 restraining 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
- 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)
- Physics & Mathematics (AREA)
- Fluid Mechanics (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)
- Wind Motors (AREA)
Abstract
The invention discloses an independent blade root pitch device, which comprises: a blade root, which is a cylindrical body, the end opening of which is sealed in the form of a piston; the air cylinder barrel is used for being fixed on a hub of the wind turbine, two ends of the air cylinder barrel are open, and the root of the blade is in sealing sliding fit with the air cylinder barrel; the pressure regulating piston is arranged at the other end of the inner cavity wall of the air cylinder barrel; a driving mechanism for driving the pressure regulating piston to regulate the pressure in the air cylinder; the blade of the wind turbine drives the blade root to stretch out and draw back in the inner cavity of the air cylinder barrel under the action of self gravity and air pressure in the air cylinder barrel in the rotating process, and the blade is automatically driven to twist by the pitch control mechanism during stretching. The blade root independent variable pitch device can reliably restrain alternating load with low cost.
Description
Technical Field
The invention relates to a wind turbine, in particular to an independent blade root pitch device.
Background
As renewable green energy sources, the wind turbine only needs to utilize the kinetic energy of wind. The wind energy utilization cost mainly comprises three aspects of manufacturing, installation and debugging, operation and maintenance. The lean manufacturing of the equipment is the basis, and from the cost of the wind turbine, the improvement of economy can be started from two technical paths, namely, the fine design reduces the cost of main components and prolongs the service life of key components. The latter is a more viable approach for in-service blade engineering accounting for 20% of the overall machine cost.
The design life of the wind turbine is more than 20 years, and the blade of the wind turbine is required to rotate about 10 in the whole life cycle of the wind turbine, for example, a 2MW unit 8 Cycle order, alternating gravity, wind shear, yaw error, shaft warping, tower interference, and the like, are experienced every cycle,Turbulence effects. Thus, fatigue loading is a very important factor in wind turbine blade design, and the degree of importance can even be compared to the limit loading caused by the limit wind speed.
The control system of the wind turbine on the horizontal shaft is generally based on active control of the sensor, the controller and the actuator. The sensor measures wind speed and direction, impeller rotating speed, output power or torque; the actuating mechanism adjusts motor torque, pitch angle, yaw angle and the like; the controller is connected with the sensor and drives the executing mechanism to perform necessary reaction on the result measured by the sensor through the control algorithm so as to achieve the control targets of optimal power or load and the like.
However, for blade alternating loads induced by wind shear, uniform pitch based systems do not control the load fluctuations well. For this purpose, there are enhanced control systems that incorporate blade root bending moment sensors and employ a blade independent pitching approach to reduce the alternating loads caused by wind shear. In recent years, the independent pitch system also introduces real-time inflow velocity measurement technology, such as laser wind-finding radar, acoustic wind-finding radar and the like. The independent pitch control method can effectively reduce alternating load, but the corresponding cost is higher, because the pitch frequency is increased, the requirements of a sensor and an actuating mechanism are greatly improved, and the cost for restraining the alternating load is high.
Disclosure of Invention
The invention aims to provide an independent blade root variable pitch device which can reliably restrain alternating load with low cost.
In order to achieve the above object, the present invention provides a blade root independent pitch device, comprising: a blade root, which is a cylindrical body, the end opening of which is sealed in the form of a piston; the air cylinder barrel is used for being fixed on a hub of the wind turbine, two ends of the air cylinder barrel are open, and a cylindrical body at the root of the blade is in sealing sliding fit with the inner cavity wall at one end of the air cylinder barrel; the pressure regulating piston is arranged at the other end of the inner cavity wall of the air cylinder barrel, so that the sealing end part of the root part of the blade and the pressure regulating piston form a sealing space in the air cylinder barrel; the driving mechanism is used for driving the pressure regulating piston to stretch out and draw back in the other end of the air cylinder barrel so as to regulate the pressure in the air cylinder barrel; the blade of the wind turbine drives the blade root to stretch out and draw back in the inner cavity of the air cylinder barrel under the action of self gravity and air pressure in the air cylinder barrel in the rotating process, and the blade is automatically driven to twist by the pitch control mechanism during stretching.
Alternatively or preferably, sealing rings are provided on the cylindrical surface of the blade root and on the inner cavity wall of the air cylinder.
Optionally or preferably, the end opening of the blade root is provided with a shape-expanding extension section, the shape-expanding extension section is attached to the inner wall of the air cylinder barrel, the open end of the air cylinder barrel is provided with a shrinking extension section, the shrinking extension section is attached to the cylindrical surface of the blade root, and sealing rings are arranged at the attachment position of the shape-expanding extension section and the air cylinder barrel and the attachment position of the shrinking extension section and the cylindrical surface of the blade root.
Optionally or preferably, the end opening of the blade root has an expansion extension section, the open end of the air cylinder has a retraction extension section, the expansion extension section is attached to the inner wall of the air cylinder and the retraction extension section is attached to the cylindrical surface of the blade root, the inner wall of the air cylinder and the outer wall of the blade root form an annular space between the expansion extension section and the retraction extension section, and the spiral guide rail and the sliding block are located in the annular space.
Optionally or preferably, the spiral guide rail is arranged at the outer side of the root of the blade, and the sliding block is arranged at the inner wall of the inner contracted section of the cylinder barrel.
Optionally or preferably, the spiral guide rail is arranged on the inner wall of the air cylinder barrel, and the sliding block is arranged on the blade root expanding extension section.
Alternatively or preferably, the end openings of the blade root are sealed by connecting sealing plates.
The technical scheme provided by the embodiment of the invention has the beneficial effects that: through the cylindrical body at the root of the blade and the inner cavity wall of the air cylinder barrel, the blade of the wind turbine drives the root of the blade to stretch out and draw back in the inner cavity of the air cylinder barrel by self gravity in the rotating process, and when the blade stretches out and draws back, the variable pitch mechanism automatically drives the blade to twist. In other words, in the rotation process of the blade, the expansion and torsion of a limited stroke can be performed under the action of gravity and the pressure difference between the inside air pressure and the outside air pressure of the cylinder barrel, so that the torsion is used for adjusting the pitch angle, the effects of larger wind sweeping area and larger pitch angle in a sweep area with lower wind speed, increasing wind capturing capacity, smaller wind sweeping area and smaller pitch angle in a sweep area with higher wind speed, limiting wind capturing load and achieving load balancing are achieved.
Drawings
Fig. 1 is a schematic structural diagram of an independent blade root pitch device according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a pitch mechanism in an independent pitch device for a blade root according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the invention.
The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art in a specific case.
The present invention will be described in further detail with reference to specific examples, but embodiments of the present invention are not limited thereto.
As shown in fig. 1 and fig. 2, an independent blade root pitch device provided by an embodiment of the present invention includes: blade root B, air cylinder D, pressure regulating piston C, actuating mechanism E and become oar mechanism, become oar mechanism and include screw guide F and slider G, blade root B is the cylindric body, and the tip opening seal of this blade root B is the piston form, and air cylinder D is used for being fixed in on the wheel hub of wind-mill, and air cylinder D's both ends are opened, and the cylindric body of blade root and the sealed sliding fit of inner chamber wall of air cylinder one end, pressure regulating piston C establish the other end at air cylinder D's inner chamber wall, and then make blade root B's sealed tip and pressure regulating piston C enclose into seal space in air cylinder D's inside. The driving mechanism E is used for driving the pressure regulating piston C to stretch and retract in the other end of the air cylinder barrel D so as to regulate the pressure in the air cylinder barrel D. The core lies in designing the pitch mechanism, it includes screw guide F and slider G, and screw guide establishes in the inner wall of blade root outside or air cylinder, and the slider is fixed in the inner wall of air cylinder or blade root outside, slider and screw guide sliding fit, and the blade of wind-force machine is by self gravity and the interior atmospheric pressure effect of air cylinder D under driving blade root B and stretching out and drawing back in air cylinder D's inner chamber in rotatory in-process, and during the flexible, pitch mechanism automatic drive blade A twists reverse.
In the scheme, the blade is improved at the blade root, the end part of the blade root is sealed, the rigidity and the wear resistance of the blade root part are increased, the roughness is reduced, an air cylinder barrel is connected with a blade flange or is used for replacing a flange (special-shaped flange) to connect the blade with a hub, the pressure in the air cylinder barrel is regulated by a pressure regulating piston, in the rotating process of the blade, the blade can stretch and retract in a limited stroke under the action of gravity and the pressure difference between the inside and outside of the cylinder barrel, meanwhile, a variable pitch mechanism automatically drives the blade A to twist to change the pitch, the effect that the wind sweeping area and the pitch angle are larger in a sweeping area with lower wind speed is realized, the wind capturing capacity is increased, and the wind capturing load is limited in a sweeping area with smaller wind sweeping area and a pitch angle with lower wind speed is realized, so that the effect of balancing the load is achieved.
As a preferred embodiment, sealing rings are provided between the cylindrical surface of the blade root and the inner chamber wall of the air cylinder, between the cylindrical surface of the pressure regulating piston C and the inner chamber wall of the air cylinder D, so that sealing between the air cylinder and the blade root can be enhanced by sealing members such as sealing rings.
As a preferred embodiment, the end opening of the blade root is provided with an expansion extension section, the expansion extension section is attached to the inner wall of the air cylinder barrel D, the open end of the air cylinder barrel D is provided with a retraction extension section, the retraction extension section is attached to the cylindrical surface of the blade root B, and sealing rings are arranged at the attachment position of the expansion extension section and the air cylinder barrel and the attachment position of the retraction extension section and the cylindrical surface of the blade root B.
As a preferred embodiment, the end opening of the blade root has a flared extension, the open end of the air cylinder has a retracted extension, the flared extension is attached to the inner wall of the air cylinder and the retracted extension is attached to the cylindrical surface of the blade root, the inner wall of the air cylinder and the outer wall of the blade root form an annular space between the flared extension and the retracted extension, and the spiral guide rail and the slider are located in the annular space. It should be noted that the spiral guide rail can be designed according to the load optimization requirement, and the whole-course torsion angle of the blade is generally not more than 10 degrees.
As a preferred embodiment, the spiral guide rail may be disposed outside the blade root, and the slider may be disposed on the inner wall of the contracted section of the cylinder.
As a preferred embodiment, the spiral guide rail may be disposed on an inner wall of the air cylinder, and the slider may be disposed on the blade root extension.
As a preferred embodiment, the end opening of the blade root B is sealed by connecting the sealing plates 12.
In summary, the blade root independent pitch device of this embodiment through improving fan blade in blade root department, sealed blade root tip increases blade root part rigidity, wearability, reduces roughness to adopt air cylinder to connect blade flange or replace flange (dysmorphism flange) to connect blade and wheel hub, pressure in the pressure regulating piston regulation air cylinder, in the rotatory in-process of blade, can carry out the flexible and the torsion of limited stroke under the effect of its gravity and cylinder inside and outside air pressure difference, realize having great area of sweeping, great pitch angle in the swept area of lower wind speed, increase wind capture ability, and have less area of sweeping, less pitch angle in the swept area of higher wind speed, the restriction wind capture load reaches the balanced effect of load. The structure does not consume external energy, has high reliability, and can reduce the peak-valley difference of the load period by more than 10 percent, thereby reducing alternating load and prolonging the service life of the blade.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The above description is merely illustrative of the embodiments of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements, etc. within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (3)
1. A blade root independent pitch device, comprising:
a blade root, which is a cylindrical body, the end opening of which is sealed in the form of a piston;
the air cylinder barrel is used for being fixed on a hub of the wind turbine, two ends of the air cylinder barrel are open, and a cylindrical body at the root of the blade is in sealing sliding fit with an inner cavity wall at one end of the air cylinder barrel;
the pressure regulating piston is arranged at the other end of the inner cavity wall of the air cylinder barrel, so that a sealing space is formed by the sealing end part of the blade root part and the pressure regulating piston in the air cylinder barrel;
the driving mechanism is used for driving the pressure regulating piston to stretch out and draw back in the other end of the air cylinder barrel so as to regulate the pressure in the air cylinder barrel; and
the blade of the wind turbine drives the blade root to stretch out and draw back in the inner cavity of the air cylinder barrel under the action of self gravity and air pressure in the air cylinder barrel in the rotating process, and the blade is automatically driven to twist when stretching out and draw back;
a sealing ring is arranged on the cylindrical surface of the blade root and the inner cavity wall of the air cylinder barrel;
the end opening of the blade root is provided with an expansion extension section, the expansion extension section is attached to the inner wall of the air cylinder barrel, the open end of the air cylinder barrel is provided with a retraction extension section, the retraction extension section is attached to the cylindrical surface of the blade root, and the attachment position of the expansion extension section and the air cylinder barrel and the attachment position of the retraction extension section and the cylindrical surface of the blade root are provided with sealing rings;
the end opening of the blade root is provided with an expansion extension section, the open end of the air cylinder barrel is provided with a retraction extension section, after the expansion extension section is attached to the inner wall of the air cylinder barrel and the retraction extension section is attached to the cylindrical surface of the blade root, an annular space is formed between the expansion extension section and the retraction extension section by the inner wall of the air cylinder barrel and the outer wall of the blade root, and the spiral guide rail and the sliding block are positioned in the annular space;
the spiral guide rail is arranged on the outer side of the root of the blade, and the sliding block is arranged on the inner wall of the inner contracted section of the cylinder barrel.
2. The blade root independent pitch device of claim 1, wherein the helical guide is disposed on an inner wall of the air cylinder, and the slider is disposed on a blade root diverging extension.
3. The blade root independent pitch device of claim 1, wherein the end opening of the blade root is sealed by a fixed seal plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910591302.3A CN110374801B (en) | 2019-07-02 | 2019-07-02 | Blade root independent variable pitch device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910591302.3A CN110374801B (en) | 2019-07-02 | 2019-07-02 | Blade root independent variable pitch device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110374801A CN110374801A (en) | 2019-10-25 |
| CN110374801B true CN110374801B (en) | 2024-04-05 |
Family
ID=68251661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910591302.3A Active CN110374801B (en) | 2019-07-02 | 2019-07-02 | Blade root independent variable pitch device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110374801B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111810354B (en) * | 2020-08-05 | 2024-08-20 | 中国华能集团清洁能源技术研究院有限公司 | Device and method for fatigue load reduction of horizontal-axis wind turbine generator system blade |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005068833A2 (en) * | 2004-01-14 | 2005-07-28 | Luiz Cesar Sampaio Pereira | Wind turbine with variable pitch blades |
| CN101874158A (en) * | 2007-10-29 | 2010-10-27 | 维斯塔斯风力系统有限公司 | Wind turbine blade and method for controlling the load on a blade |
| CN202031774U (en) * | 2009-09-21 | 2011-11-09 | 宜兴市华泰国际集团工业有限公司 | Propeller torque changing device of propellers for wind power generation |
| CN202402210U (en) * | 2011-12-29 | 2012-08-29 | 一重集团大连设计研究院有限公司 | Paddle changing system for ocean high-power wind generation set |
| CN109835468A (en) * | 2019-01-03 | 2019-06-04 | 上海歌尔泰克机器人有限公司 | A kind of pitch-changing mechanism and displacement paddle with flying height automatic adjustable-pitch |
| CN210948987U (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 | Blade root independent pitch control device |
-
2019
- 2019-07-02 CN CN201910591302.3A patent/CN110374801B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005068833A2 (en) * | 2004-01-14 | 2005-07-28 | Luiz Cesar Sampaio Pereira | Wind turbine with variable pitch blades |
| CN101874158A (en) * | 2007-10-29 | 2010-10-27 | 维斯塔斯风力系统有限公司 | Wind turbine blade and method for controlling the load on a blade |
| CN202031774U (en) * | 2009-09-21 | 2011-11-09 | 宜兴市华泰国际集团工业有限公司 | Propeller torque changing device of propellers for wind power generation |
| CN202402210U (en) * | 2011-12-29 | 2012-08-29 | 一重集团大连设计研究院有限公司 | Paddle changing system for ocean high-power wind generation set |
| CN109835468A (en) * | 2019-01-03 | 2019-06-04 | 上海歌尔泰克机器人有限公司 | A kind of pitch-changing mechanism and displacement paddle with flying height automatic adjustable-pitch |
| CN210948987U (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 | Blade root independent pitch control device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110374801A (en) | 2019-10-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8317471B2 (en) | Method for preventing rotor overspeed of a wind turbine | |
| US8696315B2 (en) | Hub for a wind turbine and method of mounting a wind turbine | |
| KR102607262B1 (en) | Air compressed vertical wind power generator set | |
| US20120027589A1 (en) | Method and apparatus for control of asymmetric loading of a wind turbine | |
| US11708814B2 (en) | Method for operating a wind turbine, a method for designing a wind turbine, and a wind turbine | |
| CN211258881U (en) | Blade independent pitch control device | |
| CN103670941B (en) | A kind of feather vertical axis aerogenerator | |
| CN110374801B (en) | Blade root independent variable pitch device | |
| CN110374794B (en) | Passive independent variable blade | |
| CN110230571B (en) | Independent variable pitch device of blade | |
| CN210948987U (en) | Blade root independent pitch control device | |
| US11608811B2 (en) | System and method for mitigating loads acting on a rotor blade of a wind turbine | |
| CN210948985U (en) | Independent variable-pitch device of wind turbine | |
| CN210948979U (en) | Independent variable-pitch blade | |
| CN210948986U (en) | Wind turbine variable pitch device | |
| CN110374795B (en) | Telescopic wind turbine blade | |
| CN202756176U (en) | Vertical-axis wind turbine with speed-adjustable wind turbine blades | |
| CN110230572B (en) | Independent pitch device of wind turbine | |
| CN110242500B (en) | Variable pitch device of wind turbine | |
| CN110285014B (en) | Independent variable blade | |
| CN111396258A (en) | Offshore wind power generation equipment with high reliability and heat dissipation function | |
| CN210460944U (en) | Length-variable wind turbine blade device | |
| CN210948978U (en) | Passive type independent variable-pitch blade | |
| CN110374793B (en) | Variable length wind turbine blade apparatus | |
| CN208816274U (en) | A kind of SCM Based adjustable speed vertical axis aerogenerator |
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 |