CN210948979U - Independent variable-pitch blade - Google Patents
Independent variable-pitch blade Download PDFInfo
- Publication number
- CN210948979U CN210948979U CN201921018631.0U CN201921018631U CN210948979U CN 210948979 U CN210948979 U CN 210948979U CN 201921018631 U CN201921018631 U CN 201921018631U CN 210948979 U CN210948979 U CN 210948979U
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- blade
- air cylinder
- cylinder barrel
- root
- helical
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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 variable pitch 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, the cylindrical body at the root of the blade is in sealed sliding fit with the inner cavity wall of the air cylinder barrel, and the blade of the wind turbine drives the root of the blade to extend 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 comprises a spiral driving part for connecting the root of the blade and the air cylinder barrel, and when the root of the blade stretches and retracts in the inner cavity of the air cylinder barrel, the spiral driving part automatically drives the blade to twist relative to the air cylinder barrel. The 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 an independent oar blade that becomes.
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 blade that becomes can reliably the low-cost alternating load of restraining.
In order to achieve the above object, the utility model provides an independent oar blade that becomes, 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, the cylindrical body at the root of the blade is in sealed sliding fit with the inner cavity wall of the air cylinder barrel, and the blade of the wind turbine drives the root of the blade to extend 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 comprises a spiral driving part for connecting the root of the blade and the air cylinder barrel, and when the root of the blade stretches and retracts in the inner cavity of the air cylinder barrel, the spiral driving part automatically drives the blade to twist relative to the air cylinder barrel. Because the air cylinder barrel is used for being fixed on a hub of a wind turbine, when the root of the blade stretches in the inner cavity of the air cylinder barrel, the blade can be automatically twisted relative to the air cylinder barrel through the spiral driving part connecting the root of the blade and the air cylinder barrel.
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 screw drive member is formed on the inside of a barrel which is fixed to the retracted extension of the hollow cylinder.
Alternatively or preferably, the end opening of the blade root is sealed by mounting a sealing plate.
Optionally or preferably, a cylinder extends from the open end of the air cylinder barrel, the spiral groove is formed in the wall of the cylinder, the spiral groove penetrates through the wall of the cylinder, and the sliding block penetrates through the spiral groove and then is in sliding fit with the spiral groove.
Optionally or preferably, the screw driving part comprises at least two screw spokes and at least two sliding blocks, the screw spokes are arranged at the open end of the air cylinder barrel, the sliding blocks are fixed at the root of the blade, and the two sliding blocks are correspondingly clamped at the inner side and the outer side of the two screw spokes respectively.
Optionally or preferably, the screw driving part comprises at least two screw spokes and at least one sliding block, the screw spokes are arranged at the open end of the air cylinder barrel, the sliding block is fixed at the root of the blade, and the sliding block is clamped in the sliding rail between the two screw spokes.
Alternatively or preferably, the open end of the air cylinder barrel extends out of a track support on which at least two helical spokes are formed.
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 an independent variable pitch blade according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pitch changing mechanism in an independent variable-pitch blade according to an embodiment of the present invention;
fig. 3 is another schematic structural diagram of a pitch mechanism in an independent pitch blade according to 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, the embodiment of the present invention provides an independent variable pitch blade, including: the blade root part D is a cylindrical body, an opening at the end part of the blade root part D is sealed to be in a piston form, the air cylinder E is used for being fixed on a hub of a wind turbine, one end of the air cylinder E is opened, the cylindrical body at the blade root part is in sealed sliding fit with the inner cavity wall of the air cylinder, and the blade A of the wind turbine drives the blade root part D to stretch out and draw back in the inner cavity of the air cylinder E by means of self gravity in the rotating process. The core lies in designing the variable pitch mechanism, which comprises a spiral driving part used for connecting the root of the blade and the air cylinder barrel, wherein when the root of the blade stretches and retracts in the inner cavity of the air cylinder barrel, the spiral driving part automatically drives the blade to twist relative to the air cylinder barrel. Because the air cylinder barrel is used for being fixed on a hub of a wind turbine, when the root of the blade stretches in the inner cavity of the air cylinder barrel, the blade can be automatically twisted relative to the air cylinder barrel through the spiral driving part connecting the root of the blade and the air cylinder barrel.
Referring to fig. 2, the present embodiment provides a specific pitch control mechanism, where the spiral driving component includes a spiral groove B and a slider C, the spiral groove B is disposed at an open end of the air cylinder barrel, the slider C is fixed at a position corresponding to the spiral groove at the root of the blade, and the slider and the spiral groove are in sliding fit. Furthermore, a cylinder extends out of the open end of the air cylinder barrel, a spiral groove is formed in the wall of the cylinder and penetrates through the wall of the cylinder, and the sliding block penetrates through the spiral groove and then is in sliding fit with the spiral groove.
As shown in fig. 3, the screw driving part may further include at least two screw spokes 31 and at least two sliding blocks 32, the screw spokes 31 are disposed at the open end of the air cylinder tube, the sliding blocks 32 are fixed at the root of the blade, and the two sliding blocks 32 are correspondingly engaged with the inner side and the outer side of the two screw spokes 31, respectively. Further, the open end of the air cylinder barrel extends out of the track support, and at least two spiral spokes are formed on the track support. In this way, by correspondingly engaging the two sliders 32 on the inner side and the outer side of the at least two helical spokes 31, the blade can be twisted by the interaction between the sliders provided thereon and the helical spokes when the blade is extended or retracted.
In addition, the spiral driving part can also be designed as follows, namely the spiral driving part comprises at least two spiral spokes and at least one sliding block, the spiral spokes are arranged at the open end of the air cylinder barrel, the sliding block is fixed at the root part of the blade, and the sliding block is clamped in a sliding rail between the two spiral spokes. Here, the open end of the air cylinder barrel extends out of the rail bracket, and at least two helical spokes are formed on the rail bracket.
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.
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 E, the open end of the air cylinder E 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 D, 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 D.
As a preferred embodiment, the screw drive is formed in the wall of the cylinder body which is fixed to the retracted extension of the hollow cylinder.
As a preferred embodiment, the end opening of the blade root D is sealed by mounting a sealing plate 12.
In summary, in the independent variable pitch blade of the embodiment, the fan 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 are increased, and the roughness is reduced, and the air cylinder barrel is used for connecting the blade flange or replacing a flange (a special-shaped flange) to connect the blade and the hub, so that 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, the purposes of increasing the wind catching capacity and realizing a larger wind sweeping area and a larger pitch angle in a sweeping area with lower wind speed, and limiting the wind catching load and achieving the effect of load balancing are achieved by a smaller wind sweeping area and a smaller pitch angle in a. 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 (10)
1. An individual 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 blade of the wind turbine drives the blade root to extend and contract in the inner cavity of the air cylinder barrel by means of self gravity in the rotating process; and
the variable pitch mechanism comprises a spiral driving component used for connecting the blade root and the air cylinder barrel, and when the blade root stretches and retracts in the inner cavity of the air cylinder barrel, the spiral driving component automatically drives the blade to twist relative to the air cylinder barrel.
2. The individual pitch blade according to claim 1, wherein sealing rings are provided on the surface of the cylinder of the blade root and the inner cavity wall of the air cylinder barrel.
3. The independent variable 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 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. An individual pitch blade according to claim 3, wherein said helical drive member is formed on the inside of a cylinder fixed to a tapered extension of said air cylinder barrel.
5. An individual pitch blade according to claim 1, wherein the end opening of the blade root is sealed by mounting a sealing plate.
6. The independent pitch blade according to claim 1, wherein the helical driving member comprises a helical groove and a slider, the helical groove is formed in the open end of the air cylinder barrel, the slider is fixed to a portion of the blade root corresponding to the helical groove, and the slider is in sliding fit with the helical groove.
7. The independent pitch blade according to claim 6, wherein a cylinder extends from an open end of the air cylinder barrel, the spiral groove is formed in the wall of the cylinder, the spiral groove penetrates through the wall of the cylinder, and the sliding block is in sliding fit with the spiral groove after penetrating through the spiral groove.
8. The independent pitch blade according to claim 1, wherein the helical driving part comprises at least two helical spokes and at least two sliding blocks, the helical spokes are arranged at the open end of the air cylinder barrel, the sliding blocks are fixed at the root of the blade, and the two sliding blocks are correspondingly clamped at the inner side and the outer side of the two helical spokes respectively.
9. The individual pitch blade of claim 8 wherein said helical drive member comprises at least two parallel helical spokes forming a slide track therebetween, said slider being snap-fitted within the slide track formed between said two helical spokes.
10. An individual pitch blade according to claim 8 or 9, wherein the open end of the air cylinder barrel extends out of a rail bracket, at least two of said helical spokes being formed on said rail bracket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921018631.0U CN210948979U (en) | 2019-07-02 | 2019-07-02 | Independent variable-pitch blade |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921018631.0U CN210948979U (en) | 2019-07-02 | 2019-07-02 | Independent variable-pitch blade |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210948979U true CN210948979U (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921018631.0U Expired - Fee Related CN210948979U (en) | 2019-07-02 | 2019-07-02 | Independent variable-pitch blade |
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| CN (1) | CN210948979U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285014A (en) * | 2019-07-02 | 2019-09-27 | 中国大唐集团新能源科学技术研究院有限公司 | Independent pitch blade |
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2019
- 2019-07-02 CN CN201921018631.0U patent/CN210948979U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110285014A (en) * | 2019-07-02 | 2019-09-27 | 中国大唐集团新能源科学技术研究院有限公司 | Independent pitch blade |
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| Date | Code | Title | Description |
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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 |