CN210948985U - Independent variable-pitch device of wind turbine - Google Patents
Independent variable-pitch device of wind turbine Download PDFInfo
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- CN210948985U CN210948985U CN201921018162.2U CN201921018162U CN210948985U CN 210948985 U CN210948985 U CN 210948985U CN 201921018162 U CN201921018162 U CN 201921018162U CN 210948985 U CN210948985 U CN 210948985U
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- blade
- air cylinder
- cylinder barrel
- wind turbine
- root
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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Abstract
The utility model discloses an independent oar device that becomes of wind energy conversion system, include: the blade root is a cylindrical body, and the end part of the blade root is opened and sealed; the air cylinder barrel is used for being fixed on a hub of the wind turbine, and one end of the air cylinder barrel is open; the cylindrical body at the root of the blade is matched with the inner cavity wall of the air cylinder barrel through a spiral groove and a spiral guide rail structure, the blade of the wind turbine drives the root of the blade to stretch in the inner cavity of the air cylinder barrel by means of self gravity in the rotating process, and when the blade stretches, the spiral groove and the spiral guide rail structure automatically drive the blade to twist. The independent variable pitch device of the wind turbine can reliably restrain alternating load with low cost.
Description
Technical Field
The utility model relates to a wind energy conversion system especially relates to an independent variable pitch device of wind energy conversion system.
Background
As a renewable green energy source, 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 and operation and maintenance. The lean manufacturing of the equipment is the basis, and the improvement of the economy can be started from two technical paths in consideration of the cost of the wind turbine, so that the cost of main components is reduced through fine design, and the service life of key components is prolonged. The latter is a more feasible way for in-service blade technology transformation which accounts for 20% of the total machine cost.
The design life of the wind turbine is more than 20 years, taking a 2MW unit as an example, the blade of the wind turbine needs to rotate by about 10 in the whole life cycle8The order of the week is subjected to the effects of alternating gravity, wind shear, yaw error, shaft warping, tower interference, turbulence every week. Therefore, in the design of wind turbine blades, the fatigue load is a very important factor, and the importance degree can be compared with the limit load caused by the limit wind speed.
The control system for a wind turbine in the horizontal axis is generally based on active control of sensors, controllers and actuators. The sensor measures wind speed and direction, impeller rotating speed, output power or torque; the actuating mechanism adjusts the torque, the pitch angle, the yaw angle and the like of the motor; the controller is connected with the two and drives the actuating mechanism to carry out necessary reaction on the result measured by the sensor through a control algorithm so as to achieve the control targets of optimal power or load and the like.
However, for blade alternating loads due to wind shear induction, the unified pitch based system does not control the load fluctuations well. Therefore, a blade root bending moment sensor is introduced into some strengthened control systems, and an alternating load caused by wind shearing is reduced by adopting a blade independent pitch control method. In recent years, real-time inflow velocity measurement technologies, such as laser wind-finding radar, acoustic wind-finding radar and the like, are also introduced into the independent pitch system. The independent variable-pitch control method can effectively reduce the alternating load, but the corresponding cost is higher, because the variable-pitch frequency is increased, the requirements of a sensor and an actuating mechanism are greatly improved, and the cost for inhibiting the alternating load is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an independent oar device that becomes of wind energy conversion system can reliably the low-cost suppression alternating load.
In order to achieve the above object, the utility model provides an independent oar device that becomes of wind energy conversion system, include: the blade root is a cylindrical body, and the end part of the blade root is opened and sealed; the air cylinder barrel is used for being fixed on a hub of the wind turbine, and one end of the air cylinder barrel is open; the cylindrical body at the root of the blade is matched with the inner cavity wall of the air cylinder barrel through a spiral groove and a spiral guide rail structure, the blade of the wind turbine drives the root of the blade to stretch in the inner cavity of the air cylinder barrel by means of self gravity in the rotating process, and when the blade stretches, the spiral groove and the spiral guide rail structure automatically drive the blade to twist.
Alternatively or preferably, the surface of the cylindrical body of the blade root and the inner cavity wall of the air cylinder barrel are provided with sealing rings.
Optionally or preferably, the end opening of the blade root is provided with an expanding extension section, the 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 an inner contracting extension section, the inner contracting extension section is attached to the surface of the cylinder body of the blade root, and sealing rings are arranged at the attachment positions of the expanding extension section and the air cylinder barrel, the attachment positions of the inner contracting extension section and the surface of the cylinder body of the blade root.
Alternatively or preferably, the end opening of the blade root is sealed by mounting a sealing plate.
Optionally or preferably, the cylindrical body at the root of the blade is provided with a spiral guide rail, and the inner cavity wall of the air cylinder barrel is provided with a spiral groove.
Optionally or preferably, the cylindrical body at the root of the blade is provided with a spiral groove, and the inner cavity wall of the air cylinder barrel is provided with a spiral guide rail.
The utility model provides a beneficial effect that technical scheme brought is: the cylindrical body at the root of the blade is matched with the inner cavity wall of the air cylinder barrel through the spiral groove and the spiral guide rail structure, the blade of the wind turbine drives the root of the blade to stretch in the inner cavity of the air cylinder barrel by the self gravity in the rotating process, and the spiral groove and the spiral guide rail structure automatically drive the blade to twist when the blade stretches. In other words, in the rotating process of the blade, the blade can be stretched and twisted in a limited stroke under the action of the gravity of the blade and the difference between the air pressure inside and outside the cylinder barrel, namely the blade moment angle is adjusted by twisting, so that the wind capturing capacity is increased by a large wind sweeping area and a large blade moment angle in a sweeping area with low wind speed, and the wind capturing load is limited by a small wind sweeping area and a small blade moment angle in a sweeping area with high wind speed, so that the effect of load balance is achieved.
Drawings
Fig. 1 is a schematic structural diagram of an independent pitch control device of a wind turbine provided by an embodiment of the present invention.
Fig. 2 is a schematic view of the structural cooperation of the spiral groove and the spiral guide rail in the independent pitch control device of the wind turbine provided by the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the invention.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected 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 through specific situations.
The present invention will be described in further detail with reference to specific examples, but the present invention is not limited thereto.
As shown in FIG. 1, the embodiment of the utility model provides an independent change oar device of wind energy conversion system, include: the blade root 11 is a cylindrical body, the end part of the blade root 11 is sealed, the air cylinder 2 is used for being fixed on a hub of a wind turbine, and one end of the air cylinder 2 is open. The core lies in that the cylindrical body of the blade root 11 is matched with the inner cavity wall of the air cylinder 2 through a spiral groove and a spiral guide rail structure, the blade 1 of the wind turbine drives the blade root 11 to stretch in the inner cavity of the air cylinder 2 by self gravity in the rotating process, and the spiral groove and the spiral guide rail structure automatically drive the blade 1 to twist when the blade 1 stretches.
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, the blade flange is connected with the blade cylinder by adopting a spiral air cylinder barrel or the blade flange is connected with the hub by replacing a flange (a special flange), and in the rotating process of the blade, the blade can be stretched and twisted in a limited stroke under the action of the gravity of the blade and the air pressure difference inside and outside the cylinder barrel, so that the wind catching capacity is increased by realizing the larger wind sweeping area and the larger pitch angle in the sweeping area with lower wind speed, and the wind catching load is limited by the smaller wind sweeping area and the smaller pitch angle in the sweeping area with higher wind speed, thereby achieving the effect of load.
As a preferred embodiment, sealing rings are provided on the surface of the cylindrical body at the root of the blade and the inner cavity wall of the air cylinder tube, so that the sealing between the air cylinder tube and the blade root can be enhanced by the sealing members such as the sealing rings. Of course, the helical groove between the cylindrical body of the blade root 11 and the inner chamber wall of the air cylinder 2 and the helical track structure itself may also effect the sealing.
As a preferred embodiment, the end opening of the blade root is provided with a flaring extension section 13, the flaring extension section 13 is attached to the inner wall of the air cylinder 2, the open end of the air cylinder 2 is provided with a retraction extension section 21, the retraction extension section 21 is attached to the cylindrical surface of the blade root 11, and sealing rings are arranged at the attachment positions of the flaring extension section 13 and the air cylinder and the attachment positions of the retraction extension section 21 and the cylindrical surface of the blade root 11.
As a preferred embodiment, the end opening of the blade root 11 is sealed by mounting a sealing plate 12.
As a preferred embodiment, as shown in fig. 2, it is a schematic diagram. The cylindrical body of the blade root 11 is provided with a spiral guide rail, and the inner cavity wall of the air cylinder 2 is provided with a spiral groove. Of course, the inner cavity wall of the air cylinder may be provided with a spiral guide rail 22 in a rib form, the cylindrical body at the blade root is provided with a spiral groove 21, the spiral groove 21 is matched with the rib-form spiral guide rail 22, and the blade root 11 is rotated in the telescopic process through the matching of the spiral groove 21 and the spiral guide rail 22. The air cylinder is used for being fixed on a hub of a wind turbine, the root of a blade of the wind turbine is driven to stretch out and draw back in an inner cavity of the air cylinder by the action of self gravity and air pressure in the air cylinder in the rotating process, and meanwhile, the blade of the wind turbine is driven to realize torsion through a spiral groove and a spiral guide rail structure. It should be noted that the shape of the spiral guide rail can be designed according to the requirement of load optimization, and the angle of the full-range torsion of the blade is generally not more than 10 degrees.
In summary, the independent pitch control device of the wind turbine in the embodiment is characterized in that the blade root of the wind turbine is improved, the end part of the blade root is sealed, the rigidity and the wear resistance of the blade root are improved, the roughness is reduced, the blade flange is connected with the helical air cylinder barrel or the blade flange is connected with the hub instead of the flange (the special flange), and in the rotation process of the blade, the blade can be stretched and twisted in a limited stroke under the action of the gravity of the blade and the difference between the air pressure inside and outside the cylinder barrel, so that the wind capturing capacity is increased by having a larger wind sweeping area and a larger pitch angle in a sweeping area with lower wind speed, and a smaller wind sweeping area and a smaller pitch angle in a sweeping area with higher wind speed, so that the wind capturing load is limited. The structure does not consume external energy, has high reliability, and can reduce the peak-valley difference of the load cycle 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 shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and claims do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of 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 "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An independent variable pitch device of a wind turbine is characterized by comprising:
the blade root is a cylindrical body, and the end part of the blade root is opened and sealed; and
the air cylinder barrel is used for being fixed on a hub of a wind turbine, and one end of the air cylinder barrel is open;
the cylindrical body at the root of the blade is matched with the inner cavity wall of the air cylinder barrel through a spiral groove and a spiral guide rail structure, the blade of the wind turbine is driven by the self gravity to stretch in the inner cavity of the air cylinder barrel in the rotating process, and the spiral groove and the spiral guide rail structure automatically drive the blade to twist when the blade stretches.
2. The independent variable pitch device of the wind turbine according to claim 1, wherein sealing rings are arranged on the surface of the cylindrical body of the blade root and the inner cavity wall of the air cylinder barrel.
3. The independent variable pitch device of the wind turbine according to claim 2, wherein the end opening of the blade root is provided with an expanding extension section, the 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 an inner contracting extension section, the inner contracting extension section is attached to the surface of the cylindrical body of the blade root, and the sealing rings are arranged at the attachment positions of the expanding extension section and the air cylinder barrel and the attachment positions of the inner contracting extension section and the surface of the cylindrical body of the blade root.
4. The wind turbine independent pitch device of claim 1, wherein the end opening of the blade root is sealed by mounting a seal plate.
5. The independent variable pitch device of the wind turbine according to claim 1, wherein the cylindrical body of the blade root is provided with a spiral guide rail, and the inner cavity wall of the air cylinder barrel is provided with a spiral groove.
6. The independent variable pitch device of the wind turbine according to claim 1, wherein a spiral groove is formed on the cylindrical body of the blade root, and a spiral guide rail is formed on the inner cavity wall of the air cylinder barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921018162.2U CN210948985U (en) | 2019-07-02 | 2019-07-02 | Independent variable-pitch device of wind turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921018162.2U CN210948985U (en) | 2019-07-02 | 2019-07-02 | Independent variable-pitch device of wind turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210948985U true CN210948985U (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921018162.2U Expired - Fee Related CN210948985U (en) | 2019-07-02 | 2019-07-02 | Independent variable-pitch device of wind turbine |
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| CN (1) | CN210948985U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230572A (en) * | 2019-07-02 | 2019-09-13 | 中国大唐集团新能源科学技术研究院有限公司 | Wind energy conversion system independent pitch device |
-
2019
- 2019-07-02 CN CN201921018162.2U patent/CN210948985U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110230572A (en) * | 2019-07-02 | 2019-09-13 | 中国大唐集团新能源科学技术研究院有限公司 | Wind energy conversion system independent pitch device |
| CN110230572B (en) * | 2019-07-02 | 2024-08-16 | 中国大唐集团新能源科学技术研究院有限公司 | Independent pitch device of wind turbine |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200707 |