CN210948978U - Passive type independent variable-pitch blade - Google Patents
Passive type independent variable-pitch blade Download PDFInfo
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- CN210948978U CN210948978U CN201921018168.XU CN201921018168U CN210948978U CN 210948978 U CN210948978 U CN 210948978U CN 201921018168 U CN201921018168 U CN 201921018168U CN 210948978 U CN210948978 U CN 210948978U
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- wall
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- 238000007789 sealing Methods 0.000 claims abstract description 16
- 230000007246 mechanism Effects 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000005484 gravity Effects 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- 230000008602 contraction Effects 0.000 claims description 3
- 238000010408 sweeping Methods 0.000 description 12
- 230000009471 action Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change 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
- 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
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Wind Motors (AREA)
Abstract
The utility model discloses a passive form independently becomes oar blade, include: 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 a wind turbine, one end of the air cylinder barrel is open, and the cylindrical body at the root of the blade is in sealing sliding fit with the inner cavity wall of the air cylinder barrel; the blade of the wind turbine drives the blade root to stretch and retract in the inner cavity of the air cylinder by means of self gravity in the rotating process, and the variable pitch mechanism automatically drives the blade to twist when stretching and retracting. The passive independent variable pitch blade can reliably restrain alternating load with low cost.
Description
Technical Field
The utility model relates to a wind energy conversion system especially relates to a passive form independently becomes oar blade.
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 a passive form independently becomes oar blade can reliably low-cost suppression alternating load.
In order to achieve the above object, the utility model provides a passive form independently becomes oar blade, include: 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 a wind turbine, one end of the air cylinder barrel is open, and the cylindrical body at the root of the blade is in sealing sliding fit with the inner cavity wall of the air cylinder barrel; the blade of the wind turbine drives the blade root to stretch and retract in the inner cavity of the air cylinder barrel by means of self gravity in the rotating process, and the variable pitch mechanism automatically drives the blade to twist when stretching and retracting.
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.
Optionally or preferably, the end opening of the blade root has an expanding extension section, the open end of the air cylinder barrel has an inward-contracting extension section, the expanding extension section is attached to the inner wall of the air cylinder barrel, the inward-contracting extension section is attached to the surface of the cylinder body of the blade root, an annular space is formed between the expanding extension section and the inward-contracting 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 slider are located in the annular space.
Alternatively or preferably, the spiral guide rail is arranged on the outer side of the root part of the blade, and the sliding block is arranged on the inner wall of the inner contraction section of the cylinder barrel.
Alternatively 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 opening of the blade root is sealed by a fixed sealing plate.
The embodiment of 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, 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 the self gravity in the rotating process, and the variable pitch mechanism automatically drives the blade to twist when the blade stretches out and draws back. 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 a passive independent pitch blade according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a pitch mechanism in a passive independent pitch blade provided by an 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 and fig. 2, the embodiment of the present invention provides a passive independent variable pitch blade, including: the blade root part B/air cylinder barrel D and the variable pitch mechanism comprise a spiral guide rail E and a sliding block F, the blade root part B is a cylindrical body, an opening at the end part of the blade root part B is sealed to be in a piston form, the air cylinder barrel D is used for being fixed on a hub of a wind turbine, one end of the air cylinder barrel D is open, and the cylindrical body at the blade root part is in sealed sliding fit with the inner cavity wall of the air cylinder barrel. The core lies in designing a variable pitch mechanism, which comprises a spiral guide rail and a slide block, wherein the spiral guide rail is arranged on the outer side of the root part of the blade or on the inner wall of the air cylinder barrel, the slide block is fixed on the inner wall of the air cylinder barrel or on the outer side of the root part of the blade, the slide block is in sliding fit with the spiral guide rail, the blade A of the wind turbine drives the root part B of the blade to stretch and retract in the inner cavity of the air cylinder barrel D by means of self gravity in the rotating process, and the variable pitch mechanism automatically drives the blade A.
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 adopted to connect a blade flange or replace a flange (a special-shaped flange) to connect the blade and a hub, in the rotating process of the blade, the limited stroke expansion can be carried out under the action of the gravity of the blade and the air pressure difference inside and outside the cylinder barrel, meanwhile, a variable pitch mechanism automatically drives the blade A to twist and change the pitch, the large wind sweeping area and the large pitch angle in the sweeping area with low wind speed are realized, the wind catching capacity is increased, the small wind sweeping area and the small pitch angle in the sweeping area with high wind speed are realized, the wind catching load is limited, and the load balancing effect.
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 spiral groove between the cylindrical body of the blade root part B and the inner cavity wall of the air cylinder D and the spiral guide rail structure can also realize sealing.
As a preferred embodiment, 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 D, the open end of the air cylinder D 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 B, and sealing rings are arranged at the attachment positions of the expanding extension section and the air cylinder, and at the attachment positions of the inner contracting extension section and the surface of the cylindrical body of the blade root B.
As a preferred embodiment, the end opening of the blade root has an expanding extension section, the open end of the air cylinder barrel has a contracting extension section, the expanding extension section is attached to the inner wall of the air cylinder barrel, and after the contracting extension section is attached to the surface of the cylinder body of the blade root, the inner wall of the air cylinder barrel and the outer wall of the blade root form an annular space between the expanding extension section and the contracting extension section, and the spiral guide rail and the sliding block are located in the annular space. 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.
As a preferred embodiment, the spiral guide rail may be disposed outside the root of the blade, and the slider is disposed on the inner wall of the inner contraction section of the cylinder.
In a preferred embodiment, the spiral guide rail may be disposed on an inner wall of the hollow cylinder barrel, and the sliding block is disposed on the extended blade root section.
As a preferred embodiment, the end opening of the blade root B is sealed by welding a sealing plate C.
To sum up, the passive independent variable pitch blade of the embodiment is characterized in that the blade root of the fan blade 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, an air cylinder barrel is adopted to connect a blade flange or replace a flange (a special flange) to connect the blade and a hub, 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 large wind sweeping area and the large pitch angle in the sweeping area with low wind speed are realized, the wind catching capacity is increased, the small wind sweeping area and the small pitch angle in the sweeping area with high wind speed are realized, the wind catching load is limited, and the load. 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 (7)
1. A passive independent pitch blade, 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 a wind turbine, one end of the air cylinder barrel is open, and the cylindrical body at the root of the blade is in sealing sliding fit with the inner cavity wall of the air cylinder barrel; and
the pitch control mechanism comprises a spiral guide rail and a sliding block, the spiral guide rail is arranged on the outer side of the root part of the blade or on the inner wall of the air cylinder barrel, the sliding block is fixed on the inner wall of the air cylinder barrel or on the outer side of the root part of the blade, the sliding block is in sliding fit with the spiral guide rail, the blade of the wind turbine drives the root part of the blade to stretch in the inner cavity of the air cylinder barrel by means of self gravity in the rotating process, and the pitch control mechanism automatically drives the blade to twist when the blade stretches.
2. The passive independent pitch blade 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 passive independent pitch blade 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 a contracting extension section, the 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 contracting extension section and the surface of the cylindrical body of the blade root.
4. The passive independent pitch blade according to claim 3, wherein the end opening of the blade root has an enlarged extension, the open end of the air cylinder barrel has a retracted extension, the enlarged extension fits on the inner wall of the air cylinder barrel and the retracted extension fits behind the cylindrical surface of the blade root, the inner wall of the air cylinder barrel and the outer wall of the blade root form an annular space between the enlarged extension and the retracted extension, and the helical guide rail and the slider are located in the annular space.
5. The passive independent pitch blade according to claim 1, wherein 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 contraction section of the cylinder barrel.
6. The passive independent pitch blade according to claim 1, wherein 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.
7. A passive individual pitch blade according to claim 1, wherein the end opening of the blade root is sealed by a fixed sealing plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921018168.XU CN210948978U (en) | 2019-07-02 | 2019-07-02 | Passive type independent variable-pitch blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921018168.XU CN210948978U (en) | 2019-07-02 | 2019-07-02 | Passive type independent variable-pitch blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210948978U true CN210948978U (en) | 2020-07-07 |
Family
ID=71379523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921018168.XU Expired - Fee Related CN210948978U (en) | 2019-07-02 | 2019-07-02 | Passive type independent variable-pitch blade |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210948978U (en) |
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2019
- 2019-07-02 CN CN201921018168.XU patent/CN210948978U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200707 |
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| CF01 | Termination of patent right due to non-payment of annual fee |