CN113847205B - Blade adjusting device, impeller, wind generating set and blade adjusting method of wind generating set - Google Patents

Blade adjusting device, impeller, wind generating set and blade adjusting method of wind generating set Download PDF

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Publication number
CN113847205B
CN113847205B CN202010598612.0A CN202010598612A CN113847205B CN 113847205 B CN113847205 B CN 113847205B CN 202010598612 A CN202010598612 A CN 202010598612A CN 113847205 B CN113847205 B CN 113847205B
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CN
China
Prior art keywords
blade
rope
tip
supply device
impeller
Prior art date
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CN202010598612.0A
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Chinese (zh)
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CN113847205A (en
Inventor
拜亮
刘岩
薛英保
武青虎
李钊
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Jinfeng Technology Co ltd
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Xinjiang Goldwind Science and Technology Co Ltd
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Priority to CN202010598612.0A priority Critical patent/CN113847205B/en
Publication of CN113847205A publication Critical patent/CN113847205A/en
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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
    • F03D7/0236—Adjusting aerodynamic properties of the blades by changing the active surface of the wind engaging parts, e.g. reefing or furling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0658—Arrangements for fixing wind-engaging parts to a hub
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0675—Rotors characterised by their construction elements of the blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0691—Rotors characterised by their construction elements of the hub
    • 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
    • F05B2240/00—Components
    • F05B2240/20—Rotors
    • F05B2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
    • F05B2240/31—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor of changeable form or shape
    • F05B2240/311—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor of changeable form or shape flexible or elastic
    • 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
    • F05B2270/30—Control parameters, e.g. input parameters
    • F05B2270/32—Wind speeds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Abstract

The invention relates to a blade adjusting device, an impeller, a wind generating set and a blade adjusting method thereof. The blade adjusting device is applied to the blade of the wind generating set and comprises: the guide device is arranged in the tip of the blade; the rope supply device is arranged at a position, far away from the blade tip, of the blade, and is used for providing a pull rope, the pull rope extends on one side of a windward surface between the rope supply device and the blade tip and is guided to one side of a leeward surface of the blade through the guide device, and a first end, far away from the rope supply device, of the pull rope is fixed to one side of the leeward surface; the rope supply device dynamically adjusts the bending amplitude of the blade by controlling the length of the pull rope. The wind speed adjusting device can dynamically adjust the bending amplitude of the blade according to the wind speed, effectively increase the wind sweeping area of the blade while meeting the clearance distance between the tip of the blade and the tower, and reduce the installation inclination angle or the pre-deformation of the impeller as much as possible.

Description

Blade adjusting device, impeller, wind generating set and blade adjusting method of wind generating set
Technical Field
The invention relates to the technical field of wind power generation, in particular to a blade adjusting device, an impeller, a wind generating set and a blade adjusting method thereof.
Background
The wind generating set captures wind energy through the blades to convert kinetic energy of the wind into electric energy which is then integrated into a power grid. With the development of the wind power generation industry, the length of the blade is larger and larger, and the longest blade is more than 100 meters. In addition, due to the limitation of the weight of the blade, the material of the blade can only be selected from nonmetallic materials such as glass fiber with lower density. This means that the flexibility of the blade is great and the longer the blade, the greater the flexibility, resulting in an increased deformation of the blade under the influence of high winds. The deformation of the blade may make the clearance distance between the blade tip and the tower be too small when the blade rotates to the lowest point in the vertical direction, and once the blade tip hits the tower, a tower sweeping accident often occurs.
Fig. 1 is a schematic structural view of a wind turbine generator system according to the prior art. The wind turbine generator system includes: the wind turbine comprises a tower T, a nacelle C arranged at the top of the tower T and an impeller 10, wherein the impeller 10 comprises a hub 3 and blades 2 distributed along the circumferential direction of the hub 3.
In order to prevent the clearance distance L between the blade tip 21 of the blade 2 and the tower T from being too small, the blade tip 21 is caused to touch the tower T to sweep the tower, and the technical scheme adopted in the prior art is as follows: one solution is to mount the impeller 3 at a predetermined inclination θ, typically this inclination θ=5° to 7 °, so that the initial state of the blade tip 21 is away from the tower T. Another technical solution is to perform a certain pre-deformation on the blade 2 itself, i.e. the lee side SS of the blade 2 is bent towards the windward side PS, so that the initial state of the blade tip 21 is away from the tower T. Or, the two solutions are used simultaneously, namely, the impeller 3 is installed at a preset inclination angle theta, and meanwhile, the blades 2 are subjected to certain pre-deformation to compensate the deformation of the blades 2, which is close to the tower T, caused by overlarge wind speed in the running process.
However, this approach has the following problems: the impeller 3 is arranged at a preset inclination angle theta, so that the wind sweeping area of the blades 2 which actually participate in wind energy capture is reduced; the pre-deformation design of the blades 2 can exactly counteract the deformation of the pre-blades 2 when the wind generating set generates electricity at full load, but when the wind generating set is not at full load, the pre-deformation also reduces the wind sweeping area, and the reduction of the wind sweeping area inevitably leads to the loss of generated energy. In order to obtain as much wind energy as possible, the blades must be made longer to obtain the same wind sweeping area, so that the weight of the whole fan is increased, and the manufacturing cost of the wind generating set is increased.
Disclosure of Invention
The invention aims to provide a blade adjusting device, an impeller, a wind generating set and a blade adjusting method thereof, wherein the blade adjusting device can dynamically adjust the bending amplitude of a blade, and can effectively increase the wind sweeping area of the blade while meeting the clearance distance between the tip of the blade and a tower.
In one aspect, the present invention provides a blade adjustment device for a blade of a wind turbine generator, the blade adjustment device comprising: the guide device is arranged in the tip of the blade; the rope supply device is arranged at a position, far away from the blade tip, of the blade, and is used for providing a pull rope, the pull rope extends on one side of a windward surface between the rope supply device and the blade tip and is guided to one side of a leeward surface of the blade through the guide device, and a first end, far away from the rope supply device, of the pull rope is fixed to one side of the leeward surface; the rope supply device dynamically adjusts the bending amplitude of the blade by controlling the length of the pull rope.
According to one aspect of the invention, the first end of the pull cord is located on a side of the guide device adjacent the blade tip; alternatively, the first end of the pull cord is located on a side of the guide that is remote from the blade tip.
According to one aspect of the invention, the guiding device comprises a support frame and a guiding piece arranged on the support frame, wherein the support frame is arranged between the windward side and the leeward side of the blade tip, and the guiding piece is used for guiding the stay rope from the leeward side of the blade tip to one side of the windward side.
According to one aspect of the invention, the end of the support frame near the windward side and the end near the leeward side are respectively provided with a notch for allowing the pull rope to pass through.
According to one aspect of the invention, the guide is a structural member fixedly connected with the support frame; or the guide piece is a roller wheel rotatably connected with the support frame; the guide piece is provided with a guide groove for guiding the stay cord.
According to one aspect of the invention, the blade adjustment device further comprises a fixing member, which is a sheet-like structure or a hook, for fixing the first end of the pull cord to the leeward side.
According to one aspect of the invention, the blade adjusting device further comprises a limiting piece, wherein the limiting piece is distributed on one side of the windward side along the length direction of the blade, and the limiting piece is provided with a groove or a track for accommodating the stay cord.
According to one aspect of the invention, the cord supply device comprises a driving device for driving the draw cord to extend or retract.
According to one aspect of the invention, the drive means is a rotary drive mechanism or a linear drive mechanism.
In another aspect, the present invention also provides an impeller, including: a hub; blades distributed along the circumferential direction of the hub; the guide device of the blade adjusting device is arranged in the blade tip of the blade, and the rope supply device of the blade adjusting device is arranged in the hub.
According to one aspect of the invention, the number of the blades is three, the number of the adjusting devices is one, one adjusting device comprises a rope supplying device and three guiding devices, and one rope supplying device comprises three pull ropes; alternatively, the number of the adjusting devices is three, each adjusting device comprises a rope supplying device and a guiding device, and one rope supplying device comprises a pull rope.
In another aspect, the present invention also provides a wind turbine generator system, including: a tower; the engine room is arranged at the top of the tower barrel; the impeller is characterized in that the hub of the impeller is connected with the engine room, and the bending amplitude of the blades of the impeller is dynamically adjusted through the blade adjusting device.
On the other hand, the invention also provides a blade adjusting method of the wind generating set, which comprises the following steps: acquiring wind speed information; when the wind speed is smaller than the wind speed threshold value, the blade adjusting device stretches the stay cord so that the blades are in a free stretching state; when the wind speed is greater than or equal to the wind speed threshold value, the blade adjusting device contracts the stay cord so as to enable the blade to bend towards the windward side.
The blade adjusting device comprises a guide device arranged in the blade tip of the blade and a rope supply device arranged at a position of the blade far away from the blade tip, so that the blade adjusting device can dynamically adjust the bending amplitude of the blade according to the wind speed, effectively increase the wind sweeping area of the blade while meeting the clearance distance between the blade tip of the blade and a tower, reduce the installation dip angle of the impeller or the pre-deformation of the blade as much as possible, improve the generated energy and ensure the safety of the unit.
Drawings
Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.
FIG. 1 is a schematic view of a prior art wind turbine generator system;
FIG. 2 is a schematic view of the overall structure of a blade adjustment device according to an embodiment of the present invention;
FIG. 3 is a schematic view of a partial enlarged structure of the area A in FIG. 2;
FIG. 4 is a schematic view of the guide of FIG. 3;
FIG. 5 is a schematic view of another vane adjusting device according to an embodiment of the present invention;
FIG. 6 is a schematic view of an impeller according to an embodiment of the present invention;
FIG. 7 is a schematic view of another impeller according to an embodiment of the present invention;
FIG. 8 is a schematic view of a wind turbine generator system according to an embodiment of the present invention;
fig. 9 is a flowchart of a blade adjustment method according to an embodiment of the present invention.
Reference numerals illustrate:
1-a blade adjustment device; 2-leaf blades; 21-blade tips; SS-lee side; PS-windward side; 3-wheel hubs; a T-tower; c-cabin; 10-an impeller; l-headroom;
11-a guiding device; 111-supporting frames; 111 a-opening; 112-a guide; 112 a-guide slots; 12-rope supply device; 121-pulling rope; 121 a-a first end; 122-driving means; 13-a fixing piece; 14-limiting pieces; 141-grooves.
Detailed Description
Features and exemplary embodiments of various aspects of the invention are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by showing examples of the invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order not to unnecessarily obscure the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The directional terms appearing in the following description are those directions shown in the drawings and do not limit the specific structure of the invention. In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.
The invention aims to provide a blade adjusting device, an impeller, a wind generating set and a blade adjusting method thereof, wherein the blade adjusting device can dynamically adjust the bending amplitude of a blade, and effectively increase the wind sweeping area of the blade while meeting the clearance distance between the tip of the blade and a tower.
In order to better understand the present invention, a blade adjustment device, an impeller, a wind turbine generator set, and a blade adjustment method thereof according to embodiments of the present invention are described in detail below with reference to fig. 2 to 9.
Referring to fig. 2 and 3 together, an embodiment of the present invention provides a blade adjustment device 1, which is applied to a blade 2 of a wind generating set, wherein the blade adjustment device 1 includes: a guiding device 11 and a rope supply device 12.
The guiding means 11 are arranged in the tip 21 of the blade 2.
The rope supply device 12 is arranged at a position of the blade 2 far away from the blade tip 21, the rope supply device 12 is used for providing a pull rope 121, the pull rope 121 extends on the windward side PS side between the rope supply device 12 and the blade tip 21 and is guided to the leeward side SS side of the blade 2 through the guide device 11, the first end 121a of the pull rope 121 far away from the rope supply device 12 is fixed on the leeward side SS side, and the rope supply device 12 dynamically adjusts the bending amplitude of the blade 2 by controlling the length of the pull rope 121.
The rope supply 12 is arranged at a position of the blade 2 remote from the blade tip 21, for example at the blade root or in the hub 3. Alternatively, the pull cord 121 is a steel cord that may provide some tensile strength and flexibility. The stay cord 121 extends on the windward side PS between the blade root or hub 3 and the blade tip 21, is guided to the leeward side SS of the blade 2 via the guide 11, and the first end 121a of the stay cord 121 remote from the cord supply 12 is fixed to the leeward side SS. Alternatively, the first end 121a of the pull cord 121 is secured to the leeward side SS of the blade tip 21 to shorten the length of the pull cord 121, avoiding unnecessary waste.
Therefore, when the rope supply device 12 controls the pull rope 121 to stretch, the blade 2 can be freely stretched to the initial design state of the blade 2, or the blade 2 is in a slightly tensioned state, so that unnecessary movement caused by loosening of the pull rope 121 is avoided, and the initial design state of the blade 2 only meets the clearance distance requirement. When the rope supply device 12 controls the pull rope 121 to shorten, the blade tip 21 of the blade 2 bends from the leeward side SS towards the windward side PS under the action of the pull rope 121, so that the blade tip 21 is far away from the tower T, and the bending amplitude of the blade 2 is dynamically adjusted.
The blade adjusting device 1 provided by the embodiment of the invention comprises the guide device 11 arranged in the blade tip 21 of the blade 2 and the rope supply device 12 arranged at the position of the blade 2 far away from the blade tip 21, so that the blade adjusting device 1 can dynamically adjust the bending amplitude of the blade 2 according to the wind speed, effectively increase the wind sweeping area of the blade 2 while meeting the clearance distance between the blade tip 21 of the blade 2 and the tower T, reduce the installation inclination angle of the impeller 3 or the pre-deformation of the blade 2 as much as possible, improve the generated energy and ensure the safety of a unit.
The specific structure of the blade adjustment device 1 provided by the embodiment of the present invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 3 and 4, the first end 121a of the pull cord 121 is located on a side of the guide 11 remote from the blade tip 21.
Specifically, the guiding device 11 includes a supporting frame 111 and a guiding member 112 disposed on the supporting frame 111, the supporting frame 111 is disposed between the windward side PS and the leeward side SS of the blade tip 21, and the guiding member 112 is used for guiding the pull rope 121 from the leeward side SS side to the windward side PS side of the blade tip 21.
Further, an opening 111a allowing the pull rope 121 to pass through is respectively formed at one end of the supporting frame 111 near the windward side PS and one end near the leeward side SS. The supporting frame 111 is a metal plate, such as a steel plate or an aluminum alloy plate.
Optionally, the guide member 112 is a structural member fixedly connected to the support 111, and a guide groove 112a for guiding the pull rope 121 is provided on the guide member 112. The guide member 112 may be, for example, an aluminum alloy structure, and the guide member 112 may be fastened to the support frame 111 by bolts or rivets, or may be fastened to the support frame 111 by welding.
Optionally, the guide member 112 is a roller rotatably connected to the support 111, and a guide groove 112a for guiding the pull rope 121 is provided on the outer periphery of the roller, so that the roller can reduce the friction between the pull rope 121 and the guide groove 112a, and further save the pulling force of the rope supply device 12 on the pull rope 121. In order to reduce friction between the pulling rope 121 and the guide groove 112a of the guide 112, lubricating oil may be coated in the guide groove 112a.
Alternatively, the guide member 112 is disposed toward the blade tip 21, the pull cord 21 extends from the side of the cord supply device 12 toward the blade tip 21, passes through the opening 111a of the support frame 111 near the windward side PS, then bypasses the guide groove 112a of the guide member 112, reaches the leeward side SS of the blade tip via the opening 111a of the support frame 111 near the leeward side SS, and the first end 121a of the pull cord 121 remote from the cord supply device 12 is fixed to the leeward side SS.
Further, as shown in fig. 3, the blade adjustment device 1 further includes a fixing member 13, and the fixing member 13 fixes the first end 121a of the pull cord 121 to the leeward side SS. Alternatively, the fixing member 13 is a sheet-like member, and the first end 121a of the pulling cord 121 may be fixed to the leeward side SS side by hot press molding or by bolting.
Alternatively, the fixing member 13 is a hook disposed on the leeward side SS side to fix the first end 121a of the pulling cord 121 to the hook. The fixing member 13 may fix the first end 121a of the string 121 to the leeward side SS during blade molding, or may fix the first end 121a of the string 121 to the leeward side SS after blade manufacturing.
Further, the blade adjusting device 1 further includes a limiting member 14, the limiting member 14 is distributed on the windward side PS along the length direction of the blade 2, and the limiting member 14 is provided with a groove 141 or a track for accommodating the pull cord 121. The groove 141 or rail of the stopper 14 prevents the pull cord 121 from being randomly displaced within the blade 2.
Alternatively, the stopper 14 is a sheet-like structure having a groove 141, and is manufactured by a press molding process. Alternatively, the limiting member 14 is a plate-like structure, and a side facing the inner wall of the blade 2 is provided with a strip-like track for accommodating the pull cord 121. In order to reduce friction between the draw cord 121 and the groove 141 or rail of the stopper 14, lubricating oil may be coated in the groove 141 or rail.
Optionally, the number of the limiting members 14 is plural, the limiting members 14 are distributed at intervals on the windward side PS along the length direction of the blade 2, and the grooves 141 or the tracks of the limiting members 14 may form an extending path of the pull rope 121, so as to prevent the pull rope 121 from being randomly deviated in the blade 2. Because the shape of the blade 2 is irregularly arranged along the length direction, the limiting pieces 14 are distributed on one side of the windward side PS at intervals, on one hand, the pull ropes 121 can be arranged along with the irregular shape of the blade 2 as much as possible, so that the bending amplitude of the blade 2 can be controlled conveniently; on the other hand, the overall length of the stopper 14 can be reduced, saving the material cost of the stopper 14.
The rope supply device 12 further includes a driving device 122 (as shown in fig. 6 and 7), and the driving device 122 is used for driving the pull rope 121 to extend or retract. Alternatively, the driving device 122 is a rotation driving mechanism, such as a rotating motor, and the pulling rope 121 is wound around an output shaft of the rotating motor and is extended or contracted along with forward and reverse rotation movement of the rotation driving mechanism. Alternatively, the driving device 122 is a linear driving mechanism, such as a linear motor, a cylinder, or a hydraulic cylinder, and the end of the pulling rope 121 remote from the blade tip 21 is connected to an output shaft of the linear driving mechanism and extends or contracts with the reciprocating linear motion of the output shaft of the linear driving mechanism.
Fig. 5 shows a schematic structural diagram of another blade adjustment device according to an embodiment of the present invention. As shown in fig. 5, the blade adjusting device 1 is similar to the blade adjusting device 1 shown in fig. 2 to 4, except that the first end 121a of the pull cord 121 is located on the side of the guiding device 11 near the blade tip 21.
In this embodiment, the guide 112 of the guide 11 is arranged towards the blade tip 21. The pull rope 21 extends from the rope supply device 12 side toward the blade tip 21, passes through the opening 111a of the support frame 111 near the windward side PS end, then bypasses the guide groove 112a of the guide member 112 and extends to the leeward side SS of the blade tip, and the first end 121a of the pull rope 121 remote from the rope supply device 12 is fixed to the leeward side SS side.
As an alternative, the guide 112 of the guide 11 may also be arranged on the side of the support 111 facing away from the blade tip 21. The pull rope 21 extends from the side of the rope supply device 12 toward the blade tip 21, bypasses the guide groove 112a of the guide member 112, then extends to the leeward side SS of the blade tip through the opening 111a of the support frame 111 near the leeward side SS, and the first end 121a of the pull rope 121 remote from the rope supply device 12 is fixed to the leeward side SS.
Referring to fig. 6, an embodiment of the present invention also provides an impeller 10, comprising: the blade adjustment device 1, the blade 2 and the hub 3 as described above.
The blades 2 are distributed along the circumferential direction of the hub 3. Alternatively, the number of blades 2 is three, and the three blades 2 are uniformly distributed along the circumferential direction of the hub 3.
The guide device 11 of the blade adjusting device 1 is arranged in the tip 21 of the blade 2, and the rope supply device 12 of the blade adjusting device 1 is arranged in the hub 3.
The number of the blade adjusting devices 1 is one, the blade adjusting devices 1 comprise a rope supply device 12 and three guide devices 11, the rope supply device 12 comprises three pull ropes 121, the three pull ropes 121 are respectively driven by the same driving device 122, and the three pull ropes 121 are simultaneously stretched or contracted, so that the bending amplitude of the three blades 2 is simultaneously controlled.
The output shaft of the driving device 122 is provided with three connecting parts which are respectively corresponding to the three pull ropes 121 one by one. If the drive 122 is a rotary drive, three connections are provided at intervals along the axial direction of the output shaft. If the driving device 122 is a linear driving mechanism, three connection portions are provided at intervals in the circumferential direction of the output shaft.
Referring to fig. 7, the embodiment of the present invention further provides an impeller 10, which is similar to the impeller 10 shown in fig. 6 in that the number of the blade adjustment devices 1 is three, each blade adjustment device 1 includes a rope supply device 12 and a guide device 11, and one rope supply device 12 includes a pull rope 121.
The pull cord 121 of each blade 2 is controlled by one blade adjustment device 1, so that the bending amplitude of the three blades 2 can be controlled individually. When the impeller 10 drives the three blades 2 to rotate in the air, only the clearance distance between the blade tip 21 of one blade 2 and the tower T is smaller at a certain moment, and only the bending amplitude of the blade 2 is required to be controlled, so that the bending amplitude of the other two blades 2 is not required to be adjusted.
Referring to fig. 8, an embodiment of the present invention further provides a wind turbine generator set, including: a tower T, a nacelle C and an impeller 10 as described above.
The nacelle C is arranged at the top of the tower T, the hub 3 of the impeller 10 is connected with the nacelle C, and the bending amplitude of the blades 2 of the impeller 10 is dynamically adjusted by the blade adjusting device 1, so that the horizontal distance between the blade tip 21 and the tower T is greater than or equal to the preset clearance distance when the blades 2 rotate to the lowest point in the vertical direction.
As shown in fig. 8, a tension 121 controlled by the blade adjustment device 1 is provided between the tip 21 of the blade 2 and the hub 3. When the pull rope 121 is contracted, the pulling force at the blade tip 21 is decomposed into a pulling force in the horizontal direction and a pulling force in the vertical direction, and the force in the horizontal direction deforms the blade 2 in a direction away from the tower T, so that the deformation of the blade 2 under the action of wind load is resisted, and therefore the decreasing amplitude of the clearance distance L is slowed down, and even the clearance distance L is increased. When the pull rope 121 is extended, the blade 2 can be freely extended to the initial design state of the blade 2, or the blade 2 is in a slightly tensioned state, so that unnecessary movement caused by loosening of the pull rope 121 is avoided, and only the initial design state of the blade 2 meets the clearance distance L requirement.
Therefore, the bending amplitude of the blade 2 can be dynamically adjusted through the blade adjusting device 1 to meet the design requirement of the clearance distance L, which means that the installation inclination angle theta of the impeller 10 can be reduced, for example, the inclination angle theta can be reduced from 5 degrees to 7 degrees to 2 degrees to 3 degrees; meanwhile, the blade 2 does not need to be subjected to pre-deformation design, and the wind sweeping area of the blade 2 in the length direction is equivalently increased under any wind speed working condition. When the wind generating set is fully generated, the distance between the blade tips 21 of the blades 2 and the tower T can be actively reduced, the accident of tower collapse is avoided, and the safety of the wind generating set is ensured while the generated energy is ensured.
Referring to fig. 9, the embodiment of the invention further provides a method for adjusting a blade of a wind generating set, which includes:
step S1: acquiring wind speed information;
step S21: when the wind speed is less than the wind speed threshold value, the blade adjustment device 1 stretches the pull cord 121 to put the blade 2 in a freely stretched state. The wind speed threshold may be, for example, 12m/s.
Step S22: when the wind speed is greater than or equal to the wind speed threshold value, the blade adjusting device 1 contracts the stay cord 121 to bend the blade 2 towards the windward side PS, so that the horizontal distance L between the blade tip 21 and the tower T of the wind generating set is greater than or equal to the preset clearance distance when the blade 2 rotates to the lowest point in the vertical direction.
According to the blade adjusting method of the wind generating set, the blade adjusting device 1 is arranged between the inside of the blade 2 and the hub 3, so that the bending amplitude of the blade 2 can be dynamically adjusted according to the wind speed, the clearance distance between the tip 21 of the blade 2 and the tower T is met, the wind sweeping area of the blade is effectively increased, the installation dip angle of the impeller 10 or the pre-deformation of the blade is reduced as much as possible, and the manufacturing cost and the installation cost of the blade are reduced.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (12)

1. Blade adjustment device for a blade (2) of a wind power plant, characterized in that the blade adjustment device comprises:
a guide device (11) arranged in the tip (21) of the blade (2);
a rope supply device (12) arranged at a position of the blade (2) far away from the blade tip (21), wherein the rope supply device (12) is used for providing a pull rope (121), the pull rope (121) extends on the windward side (PS) side between the rope supply device (12) and the blade tip (21), is guided to the leeward side (SS) side of the blade (2) through the guide device (11), and a first end (121 a) of the pull rope (121) far away from the rope supply device (12) is fixed on the leeward side (SS);
wherein the rope supply device (12) dynamically adjusts the bending amplitude of the blade (2) by controlling the length of the pull rope (121);
the blade adjusting device (1) further comprises a fixing piece (13), wherein the fixing piece (13) is a sheet structural piece or a hook and is used for fixing the first end (121 a) of the pull rope on one side of the leeward side (SS).
2. Blade adjustment device according to claim 1, characterized in that the first end (121 a) of the pull cord (121) is located at the side of the guiding means (11) close to the blade tip (21); alternatively, the first end (121 a) of the pull cord (121) is located on a side of the guiding means (11) remote from the blade tip (21).
3. Blade adjustment device according to claim 1 or 2, characterized in that the guiding device (11) comprises a supporting frame (111) and a guiding element (112) arranged on the supporting frame (111), the supporting frame (111) being arranged between the windward side (PS) and the leeward side (SS) of the blade tip (21), the guiding element (112) being arranged for guiding the pull rope (121) from the leeward side (SS) side to the windward side (PS) side of the blade tip (21).
4. A blade adjustment device according to claim 3, characterized in that the end of the support frame (111) near the windward side (PS) and the end near the leeward side (SS) are respectively provided with a notch (111 a) allowing the pull rope (121) to pass through.
5. A blade adjustment device according to claim 3, characterized in that the guide (112) is a structural member fixedly connected to the support frame (111); or, the guide piece (112) is a roller rotatably connected with the supporting frame (111); the guide member (112) is provided with a guide groove (112 a) for guiding the pull rope (121).
6. Blade adjustment device according to claim 1, characterized in that the blade adjustment device (1) further comprises a limiting member (14), wherein the limiting member (14) is distributed on one side of the windward side (PS) along the length direction of the blade (2), and the limiting member (14) is provided with a groove (141) or a track for accommodating the pull rope (121).
7. Blade adjustment device according to claim 1, characterized in that the rope supply device (12) further comprises a driving device (122), the driving device (122) being adapted to drive the pull rope (121) to extend or retract.
8. Blade adjustment device according to claim 7, characterized in that the drive device (122) is a rotary drive mechanism or a linear drive mechanism.
9. An impeller, comprising:
a hub (3);
blades (2) distributed along the circumferential direction of the hub (3);
blade adjustment device (1) according to any one of claims 1 to 8, wherein a guiding device (11) of the blade adjustment device (1) is arranged in a blade tip (21) of the blade (2), and a rope supply device (12) of the blade adjustment device (1) is arranged in the hub (3).
10. Impeller according to claim 9, characterized in that the number of blades (2) is three, the number of blade adjustment devices (1) is one, the blade adjustment devices (1) comprise one rope supply device (12) and three guiding devices (11), one rope supply device (12) comprises three pull ropes (121);
alternatively, the number of the blade adjusting devices (1) is three, each blade adjusting device (1) comprises one rope supplying device (12) and one guiding device (11), and one rope supplying device (12) comprises one stay rope (121).
11. A wind turbine generator set, comprising:
a tower (T);
a nacelle (C) provided on top of the tower (T);
-an impeller (10) according to claim 9 or 10, wherein the hub (3) of the impeller (10) is connected to the nacelle (C), and wherein the blades (2) of the impeller (10) are dynamically adjusted in their bending amplitude by means of a blade adjustment device (1).
12. A method of adjusting a blade of a wind turbine as defined in claim 11, comprising:
acquiring wind speed information;
when the wind speed is smaller than a wind speed threshold value, the blade adjusting device (1) stretches the stay cord (121) so as to enable the blade (2) to be in a free stretching state;
when the wind speed is greater than or equal to a wind speed threshold value, the blade adjusting device (1) contracts the stay cord (121) so as to bend the blade (2) towards the windward side.
CN202010598612.0A 2020-06-28 2020-06-28 Blade adjusting device, impeller, wind generating set and blade adjusting method of wind generating set Active CN113847205B (en)

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WO2003029750A1 (en) * 2001-10-02 2003-04-10 Vestas Wind Systems A/S Sensor construction for measuring the bending of a construction element
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DE102006020257A1 (en) * 2006-04-27 2007-10-31 Daubner & Stommel Gbr Bau-Werk-Planung Method for operating a wind energy plant
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