CN114909258B - A device for reducing wind load of wind turbine - Google Patents
A device for reducing wind load of wind turbine Download PDFInfo
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- CN114909258B CN114909258B CN202210452002.9A CN202210452002A CN114909258B CN 114909258 B CN114909258 B CN 114909258B CN 202210452002 A CN202210452002 A CN 202210452002A CN 114909258 B CN114909258 B CN 114909258B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 42
- 230000001105 regulatory effect Effects 0.000 claims abstract description 33
- 238000010248 power generation Methods 0.000 claims abstract description 7
- 230000007246 mechanism Effects 0.000 claims description 38
- 230000001276 controlling effect Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 230000008859 change Effects 0.000 abstract description 10
- 230000009471 action Effects 0.000 description 7
- 230000008878 coupling Effects 0.000 description 5
- 238000010168 coupling process Methods 0.000 description 5
- 238000005859 coupling reaction Methods 0.000 description 5
- 230000003068 static effect Effects 0.000 description 5
- 238000013459 approach Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- 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
- F03D7/0276—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling rotor speed, e.g. variable speed
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- 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
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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- 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
- F03D7/0204—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor for orientation in relation to wind direction
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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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- Sustainable Development (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
本发明公开了一种用于降低风力机风荷载的装置，包括塔架以及转动设置于塔架顶部的机壳，所述机壳内设置有发电模组以及偏航系统，所述偏航系统包括驱动件，所述驱动件的输出端安装有调速组件，所述调速组件与塔架之间通过齿轮相啮合，还包括检测所述调速组件受力的压力传感器，所述调速组件基于压力传感器的信号改变传动比为机壳的转向提供扭矩；本发明实施例通过设置调速组件，驱动件以恒定驱动力驱动调速组件转动时，转子叶片受到的风阻会使得压力传感器产生信号，该信号传递给调速组件，调速组件便可根据该信号进行传动比的调节，使得调速组件的输出扭矩可以更好的适配转子叶片受到的风阻变化，以避免驱动件出现超负荷工作的情况。
The present invention discloses a device for reducing the wind load of a wind turbine, comprising a tower and a casing rotatably arranged on the top of the tower, wherein a power generation module and a yaw system are arranged in the casing, wherein the yaw system comprises a driving member, wherein a speed regulating component is installed at the output end of the driving member, wherein the speed regulating component is meshed with the tower through gears, and further comprises a pressure sensor for detecting the force applied to the speed regulating component, wherein the speed regulating component changes the transmission ratio based on a signal of the pressure sensor to provide torque for the steering of the casing; in an embodiment of the present invention, by arranging the speed regulating component, when the driving member drives the speed regulating component to rotate with a constant driving force, the wind resistance applied to the rotor blades will cause the pressure sensor to generate a signal, and the signal is transmitted to the speed regulating component, and the speed regulating component can adjust the transmission ratio according to the signal, so that the output torque of the speed regulating component can better adapt to the change of the wind resistance applied to the rotor blades, so as to avoid the driving member from overloading.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a device for reducing wind load of a wind turbine.
Background
Wind power generators are known as power equipment for converting wind energy into mechanical work, driving a rotor to rotate by the mechanical work and finally outputting alternating current. In the working process of the wind driven generator, because the wind direction and the wind speed in the natural world can be changed in real time, a yaw system is required to drive the engine room and the rotor blades to deflect (mainly the yaw motor is used for driving the engine room to deflect by taking the axis of the tower as the axis, so that the rotor blades are opposite to or basically opposite to the wind, and the utilization rate of wind energy is improved.
If the bulletin number is CN105089930B and the bulletin day is 2018 and 06 is 29, arranging at least two groups of yaw driving devices for driving the wind driven generator to yaw, controlling the starting quantity of the yaw driving devices according to the wind speed of a wind field, and controlling the starting quantity of the yaw driving devices to be increased along with the increase of the wind speed of the wind field; the number of starts of the yaw driving device is controlled to be reduced along with the reduction of the wind speed of the wind field. The invention also discloses a yaw hydraulic control system of the wind driven generator. The invention realizes yaw driving force based on load demand. Therefore, the wind field has strong adaptability, can realize real-time wind facing, has small yaw error, good maintainability and low manufacturing cost and has low requirements on external environment.
The disadvantage of the prior art is that the driving force of the yaw system for driving the nacelle to deflect is basically constant, and the wind direction and the wind speed in nature change in real time, so that the wind resistance to be overcome when the rotor blades deflect also changes, but the force of the rotor blades for overcoming the wind resistance is basically kept unchanged due to the constant driving force, and if the wind resistance exceeds the driving force, the yaw system is overloaded, so that the service life of the yaw system is reduced.
Disclosure of Invention
The invention aims to provide a device for reducing wind load of a wind turbine, which solves the technical problems in the wind load of the wind turbine in the related art.
In order to achieve the above object, the present invention provides the following technical solutions: the utility model provides a device for reducing wind load of wind turbine, includes the pylon and rotates the casing that sets up in the pylon top, be provided with power generation module and yaw system in the casing, yaw system includes the driving piece, speed governing subassembly is installed to the output of driving piece, mesh through the gear between speed governing subassembly and the pylon, still including detecting speed governing subassembly atress's pressure sensor, speed governing subassembly changes the drive ratio and provides the moment of torsion for the turning to of casing based on pressure sensor's signal.
Above-mentioned, speed governing subassembly includes screw rod drive mechanism, be equipped with the action wheel on screw rod drive mechanism's the nut piece, the driving piece rigid coupling is on the nut piece, the driving piece during operation drives the action wheel and rotates, be equipped with the reducing from the driving wheel in the casing, the action wheel rotates the time through the drive belt drive reducing from the driving wheel synchronous rotation, the reducing is from meshing through the gear with the pylon between driving wheel, still be equipped with the reducing mechanism that is used for controlling the radial dimension of reducing from the driving wheel in the casing.
Above-mentioned, the reducing is from the driving wheel includes basic carousel, basic carousel rotates to be established in the casing, be equipped with many pairs of reducing telescopic links in parallel on the circumferencial direction of basic carousel, and every pair the reducing telescopic link is symmetrical in the axial of basic carousel setting, every pair the one end that the reducing telescopic link kept away from basic carousel has the runner jointly rigid coupling, the drive belt with runner frictional contact.
Above-mentioned, reducing mechanism includes the main ejector pin that rotates with the action wheel to be connected and rotates the vice loop bar of being connected with basic carousel, main ejector pin and vice loop bar slip grafting, the reducing telescopic link inside with vice loop bar inside intercommunication, and both inside are full of liquid.
Above-mentioned, yaw system still includes spacing subassembly, spacing subassembly is including the rigid coupling limiting wheel on the pylon to and rotate two sets of gag lever posts of establishing in the casing, a plurality of spacing grooves have been seted up side by side on its circumference direction to limiting wheel edge, and two sets of gag lever posts are in the radial direction symmetry setting of limiting wheel, the spacing groove with the mutual butt of gag lever post, be equipped with the wobbling limit releasing mechanism of control gag lever post in the casing.
The limiting groove is of a V-shaped structure, two limiting rods at symmetrical positions in the radial direction of the limiting wheel are respectively abutted against two side walls of the limiting groove of the V-shaped structure, and the two limiting rods are arranged in the shell in an inverted splayed structure.
Above-mentioned, the one end that the gag lever post is close to the spacing groove is slided and is pegged graft there is the butt pole, be connected with first spring between gag lever post and the butt pole, the butt of gag lever post through the spacing groove lateral wall of butt pole and V type structure, pressure sensor is used for detecting the change of first spring elasticity.
Above-mentioned, the limit removing mechanism is including the rigid coupling is in the limit removing wheel on the lead screw drive mechanism lead screw part, the gag lever post with the casing rotates the junction portion and is equipped with first gear, gag lever post and first gear rigid coupling, slide in the casing and be provided with the rack, first gear meshes with the rack mutually, limit removing wheel is connected through the stay cord with rack one end, the rack other end with be connected with the second spring between the casing wall.
The diameter size of the decresting wheel is configured to be larger than the diameter size of the first gear.
As described above, the pull cord is configured to be inelastic.
The invention has the beneficial effects that: through setting up the speed governing subassembly, when the driving piece rotated with invariable driving force drive speed governing subassembly, the windage that rotor blade received can make pressure sensor produce the signal, and this signal transmission gives speed governing subassembly, and speed governing subassembly alright carry out the regulation of transmission ratio according to this signal for the windage that the adaptation rotor blade that the output torque of speed governing subassembly can be better received changes, in order to avoid the driving piece to appear the condition of overload work, thereby extension driving piece's life.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments described in the present application, and other drawings may be obtained according to these drawings for a person having ordinary skill in the art.
FIG. 1 is a schematic perspective view of an apparatus for reducing wind load of a wind turbine according to an embodiment of the present invention;
FIG. 2 is a schematic view of an internal perspective structure of a yaw system of an apparatus for reducing wind load of a wind turbine according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a yaw system of an apparatus for reducing wind load of a wind turbine according to an embodiment of the present invention;
FIG. 4 is an enlarged schematic view of the structure of FIG. 3 at A;
FIG. 5 is a schematic cross-sectional view of a limiting assembly of a device for reducing wind load of a wind turbine according to an embodiment of the present invention.
Reference numerals illustrate:
1. A tower; 2. a housing; 3. a power generation module; 4. a yaw system; 40. a driving member; 41. a speed regulating assembly; 410. a screw rod transmission mechanism; 411. a driving wheel; 412. reducing driven wheel; 413. a base turntable; 414. a reducing telescopic rod; 415. a rotating wheel; 42. a reducing mechanism; 420. a main ejector rod; 421. an auxiliary loop bar; 422. a liquid; 43. a limit component; 430. a limiting wheel; 431. a limit rod; 432. a limit groove; 433. a butt joint rod; 434. a first spring; 44. a de-limiting mechanism; 440. a de-limiting wheel; 441. a first gear; 442. a rack; 443. a pull rope; 444. and a second spring.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 5, the device for reducing wind load of a wind turbine provided by the embodiment of the invention includes a tower 1 and a housing 2 rotatably disposed at the top of the tower 1 through an adapted bearing, a power generation module 3 and a yaw system 4 are disposed in the housing 2, the power generation module 3 mainly includes rotor blades and a generator, the rotor blades rotate under the action of wind force (when the rotor blades move in air or the wind force drives air to flow through the rotor blades), kinetic energy of the wind is converted into mechanical energy of a rotor blade shaft, the generator rotates to generate electricity under the drive of the rotor blade shaft, the yaw system 4 includes a driving member 40, a speed regulating assembly 41 is mounted at an output end of the driving member 40, the speed regulating assembly 41 is meshed with the tower 1 through a gear, and the device further includes a pressure sensor for detecting the stress of the speed regulating assembly 41 (the pressure sensor is common knowledge in the art and is not excessively described herein), and the speed regulating assembly 41 changes a transmission ratio (the transmission ratio is a ratio of angular velocity of two rotation members in the mechanism, that is a transmission ratio=a rotation torque=a rotation torque of a driven wheel, a rotation ratio=a rotation torque is a rotation torque is proportional to a rotation torque of the housing, and a rotation ratio is equal to a rotation ratio of the driven wheel (a rotation ratio is equal to a rotation ratio is a rotation ratio of a torque is 2).
In particular, when the wind turbine (i.e. the wind power generator) works, the rotor blades are required to face or basically face the direction of the wind, so that the wind energy utilization rate can be better improved, and therefore, the whole of the casing 2 arranged at the top end of the tower 1 and all the devices in the casing 2 need to deflect around the axis of the tower 1, the yaw system 4 is arranged to provide adjustment for the deflection of the casing 2 at the top end of the tower 1 and all the devices in the casing 2, a wind vane is usually arranged on the wind power generator for detecting the wind direction, when the direction of the wind is not right or basically right opposite to the rotor blades, the wind gives the driving force to the rotor blades, the driving force is difficult to better improve, and if the driving force cannot be counteracted, the casing 2 and all the devices in the casing 2 gradually deviate from the position of the axis of the tower 1, therefore, the driving member 40 is required to be always in a working state, and if the driving force of the driving member 40 is constant, and if the driving force of the driving member 40 exceeds the driving force can be output, the driving member 40 has a load exceeding that can be output, and the driving member 40 has a service life, and the problem of reducing the driving member 40 will occur.
Therefore, a mechanism capable of adjusting the output torque of the driving element 40 according to the change of wind direction and wind force is needed, so that in the embodiment of the invention, the speed regulating assembly 41 is arranged at the output end of the driving element 40, when the driving element 40 works with constant driving force, the speed regulating assembly 41 is driven to always generate a resistance force resisting deflection of the casing 2 and all devices in the casing 2, the resistance force is always detected by the pressure sensor, the pressure sensor transmits a signal to the speed regulating assembly 41, so that the speed regulating assembly 41 adjusts the transmission ratio based on the signal, the output torque of the speed regulating assembly 41 can adapt to the driving force of wind to the rotor blade, and when the casing 2 needs to be rotated, after the transmission ratio is adjusted, the output torque of the speed regulating assembly 41 is enough to drive the casing 2 to deflect against the wind force, so that the rotor blade is opposite to or basically opposite to the wind direction, the output torque is increased through adjustment of the transmission ratio of the speed regulating mechanism, higher acceleration is obtained, the load of the driving element 40 is reduced, and the service life of the driving element is prolonged.
According to the embodiment of the invention, the speed regulating component 41 is arranged, when the driving component 40 drives the speed regulating component 41 to rotate with constant driving force, the wind resistance borne by the rotor blade can enable the pressure sensor to generate a signal, the signal is transmitted to the speed regulating component 41, and the speed regulating component 41 can regulate the transmission ratio according to the signal, so that the output torque of the speed regulating component 41 can be better adapted to the wind resistance variation borne by the rotor blade, the overload working condition of the driving component 40 is avoided, and the service life of the driving component 40 is prolonged.
Preferably, the speed regulating assembly 41 includes a screw driving mechanism 410 (the screw driving mechanism includes a screw shaft, a nut block screwed with the screw shaft, a driving motor driving the screw shaft to rotate, and a sliding rail for the nut block to linearly move), the casing of the driving member 40 is connected to the nut block, the driving member 40 drives the driving wheel 411 to rotate when working, so that the nut block can drive the driving member and the driving wheel 411 to reciprocate wholly when driven by the driving motor, the driving wheel reciprocates to approach or depart from the diameter-variable driven wheel 412, the diameter-variable driven wheel 412 is disposed in the casing 2, the driving wheel 411 drives the diameter-variable driven wheel 412 to synchronously rotate through a driving belt when rotating, the diameter-variable driven wheel 412 is meshed with the tower 1 through gears, so that the relative rotation of the driving member 40, the driving wheel 411, the driving belt, the diameter-variable driven wheel 412, a gear set and the transmission path between the tower is realized, and the relative rotation of the casing 2 is also disposed in the casing 2, and the diameter-variable mechanism 42 for controlling the radial dimension of the diameter-variable driven wheel 412 is disposed in the casing 2.
Specifically, when wind force and wind direction change, the rotor blade is not right over or basically right over against the wind direction, the rotor blade receives the driving force from the wind, and the driving force is detected by the pressure sensor and transmitted to the screw rod transmission mechanism 410, the screw rod transmission mechanism 410 gives the moving distance of the signal control nut block part, so that the distance between the driving wheel 411 and the variable-diameter driven wheel 412 is controlled more precisely, and in the process that the driving wheel 411 is gradually close to the variable-diameter driven wheel 412, the radial dimension of the variable-diameter driven wheel 412 is controlled to be gradually increased, so that the working radius of the driving wheel 411 is reduced, the working radius of the variable-diameter driven wheel 412 is increased, so that a larger transmission ratio can be obtained, and high acceleration of the variable-diameter driven wheel 412 can be ensured, so that resistance from the wind can be completely resisted, overload problem can not occur on the load of the driving piece 40, and the variable-diameter driven wheel 412 drives the casing 2 and all devices inside the casing 2 to deflect along the blade or right over the wind direction of the tower 1 in a gear engagement transmission mode until the working radius of the rotor blade is basically right over against the wind direction.
When the rotor blade is opposite or basically opposite to the wind direction, the driving force of the wind given to the rotor blade is used for driving the rotor blade to rotate by taking the rotor blade shaft as an axis, so that wind energy is converted into electric energy, and the force for deflecting the wind given to the rotor blade by taking the tower 1 axis at the moment is reduced, then the pressure sensor transmits the signal to the screw transmission mechanism 410, the screw transmission mechanism 410 adjusts the position of the nut block based on the signal, so that the distance between the driving wheel 411 and the variable-diameter driven wheel 412 is increased, and meanwhile, the variable-diameter mechanism 42 controls the radial dimension of the variable-diameter driven wheel 412 to be reduced, which is equivalent to the increase of the working radius of the driving wheel 411 and the increase of the working radius of the variable-diameter driven wheel 412, so that the transmission ratio can be obtained is reduced, and the final output torque of the variable-diameter driven wheel 412 is enough to resist the force for deflecting the wind given to the rotor blade by taking the tower 1 axis (namely, the rotor blade can keep opposite or basically opposite to the wind direction position and the tower 1 to keep relatively static force).
Preferably, the diameter-variable driven wheel 412 includes a base turntable 413, the base turntable 413 is rotatably disposed in the casing 2, a plurality of pairs of diameter-variable telescopic rods 414 are disposed in parallel in a circumferential direction of the base turntable 413, and each pair of diameter-variable telescopic rods 414 is disposed opposite to each other in an axial direction of the base turntable 413 (in reality, when the tower 1 is actually used, all the pairs of diameter-variable telescopic rods 414 are disposed vertically, each pair of diameter-variable telescopic rods 414 is disposed vertically of the base turntable 413), one end of each pair of diameter-variable telescopic rods 414 far from the base turntable 413 is fixedly connected with an elastic member, the elastic members are fixedly connected with a runner 415, that is, two ends of the runner 415 are respectively connected with a diameter-variable telescopic rod 414, that is, the elastic members of the diameter-variable telescopic rods 414 are made to have passive telescopic magnitudes, for example, the ends of the diameter-variable telescopic rods 414 include an outer cylinder and an inner rod, which are sleeved with each other, the outer cylinder is sleeved with an elastic member, the elastic member is extruded between the bottom wall of the cavity and the inner rod 414, and the transmission belt 415 is in a radial direction of the elastic member is in contact with the active diameter-variable telescopic rods, and the dynamic telescopic rods 415 are deformed, and the dynamic diameter-variable telescopic rods are deformed, and the dynamic variable diameters of the dynamic variable diameter rods are formed by the runner is the dynamic variable diameter variable telescopic rods.
Specifically, a plurality of rotating wheels 415 are arranged in parallel in the circumferential direction of the basic turntable 413, which is equivalent to the decomposition of the driven wheels, the distance between adjacent rotating wheels 415 is increased or reduced under the telescopic action of the variable-diameter telescopic rod 414, which is equivalent to the radial dimension change of the whole variable-diameter driven wheel 412, so when the driving wheel 411 drives the variable-diameter driven wheel 412 to synchronously rotate through a driving belt, the transmission ratio change is changed due to the radial dimension change of the variable-diameter driven wheel 412, different transmission ratios are obtained according to the requirement, the output torque is changed along with the change, the larger the transmission ratio is, the larger the output torque is, the better the protection effect on the driving piece 40 is, the friction contact between the driving belt and the rotating wheels 415 is achieved, when the wind force is overlarge, the transmission ratio is not enough to resist the maximum, and when the driving wheel 411 drives the variable-diameter driven wheel 412 to rotate through the driving belt, the problem occurs between the driving belt and the rotating wheels 415, so as to protect the driving piece 40 and the speed regulating assembly 41.
Preferably, the reducing mechanism 42 includes a main push rod 420 rotatably connected to the driving wheel 411 and a secondary sleeve rod 421 rotatably connected to the base turntable 413, the main push rod 420 is slidably inserted into the secondary sleeve rod 421, and the inside of the reducing telescopic rod 414 is communicated with the inside of the secondary sleeve rod 421, and both the inside of the reducing telescopic rod and the inside of the secondary sleeve rod 421 are filled with the liquid 422.
Specifically, when the screw rod transmission mechanism 410 adjusts the position of the nut block based on the signal of the pressure sensor, the distance between the driving wheel 411 and the variable-diameter driven wheel 412 changes, then the main ejector rod 420 moves closer to or away from the variable-diameter driven wheel 412 synchronously with the driving wheel 411, the main ejector rod 420 slides in the auxiliary sleeve rod 421, when the main ejector rod 420 approaches to the variable-diameter driven wheel 412, the main ejector rod 420 extrudes the liquid 422 in the auxiliary sleeve rod 421, the liquid 422 moves towards the position with small pressure after extrusion, the inside of the variable-diameter telescopic rod 414 is communicated with the inside of the auxiliary sleeve rod 421, the expansion of the variable-diameter telescopic rod 414 mainly comes from the rotating wheel 415, the stress of the rotating wheel 415 mainly comes from the extrusion of a transmission belt, so that when the driving wheel 411 approaches to the variable-diameter driven wheel 412, the extrusion force of the transmission belt given to the rotating wheel 415 is reduced, the liquid 422 extrudes the variable-diameter telescopic rod 414, the variable-diameter telescopic rod 414 stretches, and the variable-diameter telescopic rod 414 stretches, so that the rotating wheel 415 moves away from the basic turntable 413, the radial dimension of the variable-diameter driven wheel 412 is correspondingly increased, and the transmission ratio is correspondingly increased, and when the driving wheel 411 moves away from the variable-diameter driven wheel 412.
When the radial dimension of the variable-diameter driven wheel 412 changes due to the expansion and contraction of the variable-diameter telescopic rod 414, the corresponding circumference of the variable-diameter driven wheel 412 changes, the sliding of the main ejector rod 420 and the auxiliary sleeve rod 421 changes, and the two dimensional changes have a certain linear relationship, but the size of the main ejector rod 420 entering or withdrawing the auxiliary sleeve rod 421 and the expansion and contraction size of the variable-diameter telescopic rod 414 are not completely linear corresponding to each other, and when the driving wheel 411 approaches the variable-diameter driven wheel 412, the variable-diameter telescopic rod 414 stretches out too much to tighten the driving belt, so that the power transmission is influenced, the variable-diameter telescopic rod 414 stretches out too short, and the driving belt can deviate from the driving wheel 411 and the variable-diameter driven wheel 412, so that the arrangement of the elastic piece can basically compensate for the defect, no matter how much the variable-diameter telescopic rod 414 stretches, the elastic piece can be always in an elongation state, and the rotating wheel 415 is driven to be always in friction contact with the driving belt (similar to the function of a tightening wheel, the tightening wheel is a common knowledge in the field, and the power transmission can always and orderly carried out.
Further, the yaw system 4 further includes a limiting component 43, the limiting component 43 includes a limiting wheel 430 fixedly connected to the tower 1, and two sets of limiting rods 431 rotatably disposed in the casing 2, a plurality of limiting grooves 432 are formed in parallel on the edge of the limiting wheel 430 in the circumferential direction, the two sets of limiting rods 431 are symmetrically disposed in the radial direction of the limiting wheel 430, the limiting grooves 432 are mutually abutted to the limiting rods 431, and a limiting release mechanism 44 for controlling the limiting rods 431 to swing is disposed in the casing 2.
Specifically, in the yaw system 4 in the prior art, when the rotor blade rotates to a position opposite to the wind direction, the driving element 40 in the yaw system 4 applies a driving force to keep relatively static to the tower 1, so that the driving element 40 needs to be always in a working state, because the driving element 40 needs to drive the rotor blade to rotate to face or basically face the wind direction, and needs to control the rotor blade to keep relatively static to the tower 1, and the service life of the driving element 40 is limited, the working process only reduces the service life of the driving element 40, so that the driving element 40 can be stopped when the rotor blade needs to keep relatively static to the tower 1, and the limiting assembly 43 is arranged in the yaw system 4 when the rotor blade needs to be driven to rotate to face the wind direction, so that the problem can be solved.
When the rotor blade is driven to rotate to face the wind direction, the limiting mechanism 44 controls the limiting rod 431 to swing, so that the limiting rod 431 swings to a position abutting against the limiting groove 432 on the limiting wheel 430, the limiting rod 431 abuts against the limiting groove 432 to limit the relative rotation between the casing 2 and all devices inside the casing 2 and the tower 1, so that the relative rotation is kept in a relatively static state, the force of the wind to the casing 2 is all received by the limiting rod 431, the driving piece 40 can stop working, compared with the driving piece 40, the limiting rod 431 is made of a material with higher strength, the cost is far lower than that of the driving piece 40, the service life is far longer than that of the driving piece 40, the limiting rod 431 is rotatably arranged in the casing 2, and even if the limiting rod 431 is damaged, the replacement is more convenient.
Preferably, the limiting groove 432 has a V-shaped structure, two limiting rods 431 symmetrically disposed in the radial direction of the limiting wheel 430 are respectively abutted against two sidewalls of the limiting groove 432 having the V-shaped structure, and the two limiting rods 431 are arranged in the housing 2 in an inverted splayed structure.
Preferably, one end of the limiting rod 431, which is close to the limiting groove 432, is slidably inserted with a supporting rod 433, a first spring 434 is connected between the limiting rod 431 and the supporting rod 433, the limiting rod 431 is abutted to the side wall of the limiting groove 432 with a V-shaped structure through the supporting rod 433, and the pressure sensor is used for detecting the change of the elastic force of the first spring 434.
Specifically, when the rotor blade is pushed by wind force, the rotation directions of the casing 2 and all devices inside the casing 2 only rotate clockwise and anticlockwise, but in the embodiment of the present invention, the setting of the limiting rods 431 and the limiting grooves 432 can be just aligned with the rotation directions of the casing 2, for convenience of description and understanding, the diameter of the limiting wheel 430 is taken as a symmetry axis (i.e. a parting line B overlapping with one diameter of the limiting wheel 430 in fig. 5), and the two groups of limiting rods 431 are divided into two parts which are symmetrical left and right, and the two limiting rods 431 arranged in an inverted splayed structure play a role in working: when the shell 2 rotates clockwise, the limiting rod 431 positioned at the left part abuts against the limiting groove 432 to limit the rotation of the shell 2; when the casing 2 rotates counterclockwise, the stopper 431 located at the right part abuts against the stopper groove 432 to restrict the rotation of the casing 2.
When the rotor blade is pushed by wind force, the shell 2 and all devices in the shell 2 have a trend of rotating along the axis of the tower 1, the shell 2 drives the limiting rod 431 to press the side wall of the limiting groove 432 abutted against the limiting rod 431, the pressing force is generated on the first spring 434, the first spring 434 deforms and changes in elasticity, when the elasticity exceeds a set value (the wind force is small and varies time after time), for some smaller wind force, when the rotor blade is directly opposite or basically directly opposite to the wind direction, the driving piece 40 is basically not required to work to drive the rotor blade to deflect, at the moment, the force from the wind can be resisted by the first spring 434, the first spring 434 can also play a certain buffering role, when the wind direction suddenly changes, the sudden deflection of the shell 2 does not directly impact the limiting rod 431, so that the service life of the limiting rod 431 is prolonged, the pressure sensor detects the signal, and transmits the signal to the screw transmission mechanism 410, the transmission ratio between the driving wheel 411 and the variable diameter driven wheel 412 is adjusted, then the limiting mechanism 44 controls the limiting rod 431 to be separated from the limiting groove 432, and then the wind force from the shell 2 can be directly opposite to the wind direction component 40 to drive the rotor blade to deflect to the rotor blade 2, so that the rotor blade is directly opposite to the axis to rotate, and the rotor blade is opposite to the rotor blade 2, and the speed adjusting component is properly opposite to rotate, and the speed control the rotor blade to rotate, and the speed adjusting component to rotate, and can be opposite to the speed.
Preferably, the limiting mechanism 44 includes a limiting wheel 440 fixedly connected to a screw portion of the screw driving mechanism 410, a first gear 441 is disposed at a rotation connection portion of the limiting rod 431 and the casing 2, the limiting rod 431 is fixedly connected to the first gear 441, a rack 442 is slidably disposed in the casing 2, the first gear 441 is meshed with the rack 442, one end of the limiting wheel 440 and one end of the rack 442 are connected through a pull rope 443, and a second spring 444 is connected between the other end of the rack 442 and a wall of the casing 2.
Preferably, the diameter of the limiting wheel 440 is larger than that of the first gear 441, when the limiting wheel 440 rotates at a certain angle, the rack 442 drives the first gear 441 to rotate at an angle that can enable the limiting rod 431 to sufficiently deflect out of the limiting groove 432 by pulling the moving distance of the rack 442 through the pull rope 443, so that after the adjustment of the transmission ratio is finished, the deflection of the reducing driven wheel 412 driving the casing 2 is not affected by the limiting rod 431.
Preferably, the pull cord 443 is configured to be inelastic, and the distance that the rack 442 can be pulled to slide is always constant by how much the limiting wheel 440 rotates.
Specifically, in the initial state, the distance between the driving wheel 411 and the variable-diameter driven wheel 412 is furthest, then when the screw rod transmission mechanism 410 works based on the signal of the pressure sensor, the rotation of the screw rod part drives the release wheel 440 to rotate synchronously, the rotation of the release wheel 440 winds the stretching, the pull rope 443 pulls the rack 442 to slide, the second spring 444 is stretched, the rack 442 slides to drive the first gear 441 to rotate, the first gear 441 rotates to drive the stop lever 431 to deflect around the joint with the casing 2, so that the abutment lever 433 can be separated from the limit groove 432, the limit lever 431 can be removed while the transmission ratio is adjusted, after that, the speed regulation assembly 41 drives the casing 2 to deflect around the axis of the tower 1, the screw rod transmission mechanism 410 can drive the driving wheel 411 to return to the initial position when the rotor blade deflects to a position opposite to the wind direction, the screw rod part drives the release wheel 440 to rotate, the rack 442 is reversely slid under the action of the resilience of the second spring 444, the rack 442 reversely slides to drive the first gear 441 to rotate around the joint with the first gear 441, and the first gear 432 is abutted against the limit lever 432 to realize limit of the casing 2.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that modifications may be made to the described embodiments in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive of the scope of the invention, which is defined by the appended claims.
Claims (4)
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476543A (en) * | 2009-01-24 | 2009-07-08 | 哈尔滨工业大学 | Off-course driving device of non-off course gear used for aerogenerator |
| CN102312780A (en) * | 2010-06-29 | 2012-01-11 | 西门子公司 | The method of wind turbine yaw system and this yaw system of control |
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| GB637763A (en) * | 1940-10-21 | 1950-05-24 | Guardian Electric Mfg Co | Ratcheting mechanism |
| US9803728B2 (en) * | 2015-09-22 | 2017-10-31 | GM Global Technology Operations LLC | Rotary variator for a continuously variable transmission |
| CN107120399A (en) * | 2017-03-29 | 2017-09-01 | 南京农业大学 | A kind of pulley arrangement of Novel electrodeless speed change |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476543A (en) * | 2009-01-24 | 2009-07-08 | 哈尔滨工业大学 | Off-course driving device of non-off course gear used for aerogenerator |
| CN102312780A (en) * | 2010-06-29 | 2012-01-11 | 西门子公司 | The method of wind turbine yaw system and this yaw system of control |
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