CN115479099A

CN115479099A - Damper, blade for wind generating set and wind generating set

Info

Publication number: CN115479099A
Application number: CN202110600381.7A
Authority: CN
Inventors: 郭光星
Original assignee: Jiangsu Goldwind Science and Technology Co Ltd
Current assignee: Jiangsu Goldwind Science and Technology Co Ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2022-12-16

Abstract

The application provides a attenuator, a blade and wind generating set for wind generating set, wherein, the attenuator includes: the damper comprises a damper shell, a damper body and a damper cover, wherein an accommodating cavity for accommodating damping liquid is formed in the damper shell; the bent partition plates extend along the width direction of the accommodating cavity, are arranged at intervals in the length direction of the accommodating cavity and divide the accommodating cavity into a plurality of sub-accommodating cavities; and a plurality of rolling balls respectively arranged in the sub-accommodating cavities. The damper provided by the embodiment of the application is formed by matching the rolling balls with the damping liquid to adjust the damping value of the blade. When the blade generates halt flutter, the damper fully plays a role, and the vibration intensity of the blade is restrained by increasing the damping.

Description

Damper, blade for wind generating set and wind generating set

Technical Field

The application relates to the technical field of wind power generation, in particular to a damper, a blade applying the damper and a wind generating set applying the damper or the blade.

Background

At present, as the size of the blades continuously increases, the weight and the load continuously increase, and the requirements of the structural strength and the fatigue performance of the blades are higher and higher. In addition, under the shutdown condition, when lateral wind appears in a wind field, the problem of blade flutter can appear, and the safety of the whole wind turbine generator system can be seriously threatened by long-term vibration. The blade is made of a composite material, and the damping ratio is about two thousandths, and the damping value is too small to suppress severe vibration.

In the operation process of the blade, the blade rotates all the time, and if the damper in a building is directly installed in the blade, the damper and the surrounding structure are easy to damage under the action of long-term fatigue load and the safety of the blade is influenced, so that the damper suitable for the wind generating set is provided, and the damper is very important.

Disclosure of Invention

Therefore, the damping value of the blade is increased in the mode that the damper is installed inside the blade, the flutter of the blade of the wind driven generator in the shutdown state is reduced, the risk of vibration damage of the blade is reduced, the safety and the reliability of the blade are improved, and the service life of the blade is prolonged.

An aspect of the present application is to provide a damper including: the damper comprises a damper shell, a damper body and a damper cover, wherein an accommodating cavity for accommodating damping liquid is formed in the damper shell; the bent partition plates extend along the width direction of the accommodating cavity, are arranged at intervals in the length direction of the accommodating cavity and divide the accommodating cavity into a plurality of sub-accommodating cavities; and a plurality of rolling balls respectively arranged in the sub-accommodating cavities.

According to the damper provided by the embodiment of the application, the rolling balls are arranged to be matched with the damping liquid to form the damper, so that the damping value of the blade is adjusted. When the blades are shut down and flutter, the damper plays a role completely, the damping ball moves in the damping liquid to increase the damping, so that the vibration strength of the blades is restrained, the risk of vibration damage of the blades is reduced, the safety and the reliability of the blades are improved, and the service life of the blades is prolonged.

In some embodiments, the curved partition plate is provided with a through hole, so that the sub-accommodation cavities are communicated with each other. Through the arrangement of the through holes, the damping liquid in the two adjacent sub-containing cavities can flow freely.

In some embodiments, the ball comprises: a magnetic material provided with an electromagnet assembly on one side in a width direction of the damper housing, the electromagnet assembly including: and the electromagnetic relay is arranged on one outer side surface of the damper shell in the width direction. The damper provided by the embodiment of the application adopts the electromagnetic relay to control the movement of the rolling ball, when the blade vibrates, the electromagnetic relay does not work, and the rolling ball can move along with the movement of the blade in the damper in a friction mode so as to increase the damping. When the blade normally rotates or is static, the magnetic field generated by the electromagnetic relay adsorbs the rolling ball on the inner side surface of the damper shell when the electromagnetic relay works, the rolling ball is locked and does not move any more, and meanwhile, the phenomenon that the rolling ball moves to generate redundant heat to influence the damper and a bonding structure around the damper can be avoided.

In some embodiments, the electromagnet assembly further comprises: and the steel baffle is arranged on the outer side surface of the damper shell along the length direction of the damper shell, and the electromagnetic relay is arranged on the steel baffle. Considering that the action range of the electromagnet assembly is limited and the area of the damper shell can not be covered, the steel baffle with a larger area can be magnetized through the electromagnet assembly, then the steel baffle can attract the rolling ball, and the steel baffle is equivalent to a bridge for transmitting a magnetic field.

In some embodiments, the damper further comprises a controller and a vibration sensor; when the vibration sensed by the vibration sensor is lower than a preset value, the controller controls the electromagnetic relay to work to magnetize the steel baffle plate, so that the rolling ball is adsorbed to the inner wall surface of the damper shell close to one side of the steel baffle plate, and when the vibration is equal to or larger than the preset value, the electromagnetic relay stops working to release the rolling ball. When the vibration is smaller than the predetermined value, the electromagnetic relay operates to attract the rolling ball, and the rolling ball is locked on the inner wall surface of the damper housing.

In some embodiments, the damper further comprises a heat sink disposed outside the damper housing. The setting the radiator is used for at least right the attenuator dispels the heat, reduces attenuator and bonding structure around are because being heated and produce the deformation or drop, avoid consequently causing the influence to the security of blade.

In some embodiments, the heat sink is an air-cooled heat sink, the damper further includes a temperature sensor disposed on an outer wall surface of the damper housing or in the accommodating chamber, and a fan disposed at one side of the heat sink, and the controller controls the fan to be activated to radiate heat from the damper when a temperature sensed by the temperature sensor exceeds a predetermined value. When the temperature sensed by the temperature sensor does not exceed a preset value, the controller controls the fan to be turned off so as to save energy. In the embodiment of the application, the heat radiator is controlled to radiate the damper and the periphery of the damper by setting the preset temperature value, so that the safety and reliability of the bonding of the damper and the structure around the damper are ensured.

In some embodiments, the damper housing is approximately cubic, the heat sink is disposed above an upper outer surface in a thickness direction of the damper housing, and the damper further includes a honeycomb core material panel disposed on a lower outer surface in the thickness direction of the damper housing. The honeycomb core material panel is arranged at the contact position of the damper and the mounting cavity in the blade, so that secondary vibration of the damper to the blade can be reduced.

In some embodiments, the damper shell is further provided with a pouring port for pouring the damping fluid into the accommodating cavity, the diameter of each ball is 20% -30% of the distance between two adjacent bent partition plates, the diameter of each ball is larger than that of the through hole, and the magnetic material comprises any one of the following materials: iron, nickel, cobalt, the material of spin still includes: and the rubber is coated on the outer surface of the rolling ball. This application sets up magnetic material as the inner core, and its stronger impact that has sets up rubber at the spin surface, so can slow down the striking of inner core to attenuator casing wall and crooked baffle wall, avoids the damage that the direct striking of inner core caused. The diameter that sets up the spin is greater than the diameter of through-hole, avoids a plurality of spins to hold the intracavity drunkenness at each son, leads to gathering together. When the diameter of the rolling ball is too small, the provided damping is not enough, and when the diameter of the rolling ball is too large, the movement of the rolling balls in each sub-accommodating cavity is limited, so that when the diameter of the rolling ball is 20% -30% of the distance between two adjacent bent partition plates, the rolling balls can be ensured to freely move in each sub-accommodating cavity when in a free state, and the sufficient damping can also be provided.

In some embodiments, the damper further comprises a damping fluid in the accommodating chamber, the damping fluid occupying 80% -90% of the capacity of the accommodating chamber. In order to avoid because the temperature difference in season, damping fluid hot expanding and contract with cold, the damping fluid that leads to accounts for than producing the influence, simultaneously, set up damping fluid to account for hold 80% -90% of the capacity in chamber, when the blade normal rotation, because the flow space scope of damping fluid is limited, can produce less damping to restrain and wave and warp.

In some embodiments, the damping fluid has a viscosity in the range of 300 to 500 centipoise at 25 ℃ standard atmospheric pressure. When the rolling ball moves, the rolling ball is in contact friction with the damping liquid, and large damping is generated. The viscosity of the damping fluid directly affects the effect of the damper, and the too high viscosity prevents the rolling ball from moving and cannot play a good role, while the too low viscosity causes insufficient damping.

According to another aspect of the application, there is provided a blade for a wind turbine, the blade comprising a blade shell and a damper as described above, the damper being arranged inside the blade shell.

The damper of the embodiment of the application is arranged on the inner side of the blade shell, so that the vibration generated when the blade vibrates can be effectively inhibited while the power generation efficiency is not influenced, and the structure is simple.

In some embodiments, the length direction of the damper is arranged along the flapwise direction of the blade, and the width direction of the damper is arranged along the edgewise direction of the blade. The width direction of the damper is arranged along the shimmy direction of the blade, and the bent partition plate for guiding the movement of the rolling balls is also arranged along the shimmy direction of the blade, so that when the blade vibrates, the guide direction of the rolling balls is arranged in the same vibration direction of the blade, and the damping effect on the vibration can be better.

The damper can be arranged at the front edge, the tail edge or between two webs of the blade. On the premise of ensuring the safe operation of the blade, the damping effect of the damper on the vibration is improved, and particularly when the blade vibrates, the damping effect is obvious.

In some embodiments, the damper is mounted inside the suction side shell of the blade, near the trailing edge of the blade tip location. Under the precondition of ensuring the operation safety of the blade, the blade is arranged at the position which is beneficial to inhibiting the flutter of the blade as far as possible, so that the influence of the flutter on the safety of the blade can be reduced to a greater extent.

In some embodiments, the total weight of the damper is 4% -7% of the original weight of the blade. The weight of the damper is too heavy, so that the operation load of the blade is too heavy, the damper has potential safety hazards in the operation of the blade, the weight of the damper is too light, the damping effect is poor, and the vibration suppression effect is not obvious when the blade vibrates. Therefore, the total weight of the damper is 4% -7% of the original weight of the blade, so that the safety performance can be ensured, and sufficient damping can be provided.

According to another aspect of the present application, there is provided a wind turbine generator system comprising a damper as described above, and/or a blade for a wind turbine generator system as described above.

Drawings

The above and other objects and features of the present application will become more apparent from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic structural diagram of a damper provided in an embodiment of the present application;

FIG. 2 is a partial perspective view of a damper mounted to a blade according to an embodiment of the present disclosure;

FIG. 3 isbase:Sub>A schematic cross-sectional view taken along the line A-A in FIG. 2 according to an embodiment of the present disclosure;

FIG. 4 is a perspective structural schematic view of a blade provided by an embodiment of the present application;

FIG. 5 is a schematic view of an installed position of a damper in a blade provided by an embodiment of the present application;

fig. 6 is a schematic structural diagram of the blade in fig. 5 turned by 180 ° according to an embodiment of the present application.

The reference numbers illustrate:

10. a damper housing; 11. an accommodating chamber; 12. an infusion port;

20. bending the partition plate;

30. a ball;

40. an electromagnet assembly; 41. an electromagnetic relay; 42. a steel baffle plate;

60. a vibration sensor; 70. a temperature sensor; 80. a fan; 90. a honeycomb core panel;

100. a blade; 200. a damper; f1, waving direction; f2, the shimmy direction; b1, a suction surface; b2, pressure surface.

Detailed Description

Embodiments in accordance with the present application will now be described in detail with reference to the drawings, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

An embodiment of an aspect of the present application provides a damper for suppressing vibration, as shown in fig. 1, the damper including: a damper housing 10, a plurality of curved bulkheads 20, and a plurality of balls 30, wherein the damper housing 10 forms a housing chamber 11 for housing a damping fluid; a plurality of crooked baffles 20 extend along the width direction who holds chamber 11 to interval arrangement on the length direction who holds chamber 11 will hold chamber 11 and separate for a plurality of subsumes hold the chamber, has seted up the through-hole on the crooked baffle 20 for hold the chamber intercommunication each other with each son, a plurality of balls 30 arrange respectively in each subsume holds the chamber.

In the embodiment of the present application, the damper may be disposed in structures such as buildings, bridges, and cooling towers, and is used to suppress vibration, or may be disposed on components such as blades, towers, and engine rooms of the wind turbine generator system.

The shape of the damper housing 10 of the present application is specifically set according to the shape of the component or structure to be applied thereto, and when used for being provided on a blade of a wind turbine generator set, the shape of the damper may be specifically set according to the mounting position on the blade.

As shown in fig. 2 to 3, the length direction of the damper is arranged along the flapwise direction F1 of the blade 100, and the width direction of the damper is arranged along the edgewise direction F2 of the blade 100. Here, the flapping direction F1 is a direction corresponding to the length of the blade, and is exemplified by: the blade root points to the direction of the blade tip or the blade tip points to the direction of the blade root. The shimmy direction F2 is perpendicular to the flapwise direction F1, i.e. corresponds to the direction from the leading edge to the trailing edge. After the damper is installed with the blade, each curved diaphragm 20 is disposed on the blade in a yaw direction F2 (i.e., leading edge toward trailing edge). According to the blade damping liquid, the bent partition plate 20 is arranged in the shimmy direction F2, on one hand, the rolling balls 30 can be guided to move in the shimmy direction F2, and the moving direction of the rolling balls 30 is the same as the fluttering direction of the blade 100, so that the reciprocating motion of the rolling balls 30 in the damping liquid can effectively restrain the fluttering of the blade 100. On the other hand, the curved partition 20 can also effectively separate the rolling balls 30, so that the rolling balls 30 are prevented from being stacked together, and the situation that a plurality of rolling balls 30 simultaneously impact a certain position of the damper shell 10 is avoided, and the damper is further damaged is avoided. The curved partition 20 is provided, so that when the blade 100 vibrates, the rolling balls 30 impact the wall surface of the curved partition 20 to reduce the impact force on the inner wall surface of the damper housing 10, and if the curved partition 20 is not provided, the rolling balls 30 directly impact the wall surface of the damper, so that the structural safety of the damper is threatened. The curved partition plate 20 is provided with a through hole for communicating the sub-accommodating cavities with each other, so that the damping fluid in two adjacent sub-accommodating cavities can flow freely. The diameter of the ball 30 is larger than that of the through hole, so that the ball 30 can not pass through the through hole and can not be gathered in a certain sub-accommodating cavity.

The damper provided by the embodiment of the application is formed by arranging the rolling balls 30 and the damping liquid to cooperate, so that the damping value of the blade 100 is adjusted. When the stop flutter of the blade 100 occurs, the damper fully functions to suppress the vibration intensity of the blade 100 by increasing the damping.

In order to ensure that the rolling balls 30 are fully contacted with damping liquid in the moving process and avoid blockage with the partition plates, the diameters of the rolling balls 30 are 20% -30% of the distance between every two adjacent bent partition plates 20, illustratively, the distance between every two adjacent bent partition plates 20 is 100-133 mm, and the diameters of the damping balls are set to be 20-30mm, so that the rolling balls 30 can freely move in a sub-containing cavity formed by every two adjacent bent partition plates 20, the rolling balls 30 are iron core balls wrapped by rubber, and the wall surfaces of the damper are prevented from being damaged by long-term impact of the damping balls. Here, the inner wall surface of the damper housing 10 may be made of a glass fiber composite material.

In the embodiment of the present application, the damping fluid is viscous damping fluid, and exemplarily, the damping fluid may be selected from methyl silicone oil, modified silicone oil, and other materials. In the embodiment of the present application, the following factors need to be considered for the selection of the viscous damping fluid:

first, viscosity factor: the viscosity of the damping fluid is selected based on the damping required at flutter, the viscosity of the damping fluid directly affects the effect of the damper, the viscosity is too high, the movement of the ball 30 is blocked and the damper cannot function well, and the viscosity is too low, the generated damping is insufficient.

Second, temperature difference changes: because the wind driven generator operates outdoors, the annual average temperature change of an installation area is severe, the characteristic of expansion with heat and contraction with cold of the damping liquid needs to be fully considered, the damping liquid needs to occupy 80% -90% of the capacity of the damper, and the total mass of the damper is ensured to be 4% -7% of the original weight of the blade so as to ensure the safety of the blade in operation.

Thus, in some embodiments, the damping fluid comprises 80% -90% of the volume of the housing chamber 11 and has a viscosity in the range of 300-500 centipoise at 25 ℃ standard atmospheric pressure.

According to the damper provided by the embodiment of the application, when the blade 100 vibrates, the rolling balls 30 in the damper can repeatedly move back and forth along the curved partition surface 20, and the rolling balls 30 and damping liquid contact friction in the moving process to generate larger damping, so that the vibration intensity of the blade 100 is weakened.

In addition, still can be provided with on the attenuator casing 10 and hold the mouth 12 that fills of chamber 11 intercommunication, for the transportation of convenient attenuator, reduce the cost of transportation, can not fill damping fluid earlier in the transportation, when using, fills the damping fluid of corresponding viscosity into and holds chamber 11 again. In the embodiment of the application, in order to prevent the damping fluid from leaking at the filling opening 12, sealing is completed by using a sealing plug, a sealing gasket, an outer sealing rubber layer and the like. Firstly, a sealing gasket is used and filled in the sealing plug, external sealing glue or resin (such as epoxy resin) is smeared outside the sealing plug, and a next layer is smeared after the sealing plug is completely dried, so that the long-term sealing performance of the pouring opening 12 is ensured. After long-time work, the sealing position needs to be changed or added with damping liquid, the sealing position is heated firstly, after the outer sealing rubber layer is torn off, the sealing plug is pulled out, the hose is used for changing or adding the damping liquid, and the sealing state is recovered again after the sealing is finished. The diameter of the pouring opening 12 is 20-50mm, and the size of the outer sealant layer is at least three times larger than that of the pouring opening 12, so that the sealing reliability is ensured. In order to ensure that the damper can generate larger damping, damping liquid with proper viscosity is added into the damping pool along the filling port 12 so as to ensure that enough damping can be obtained to inhibit vibration in a short time under the flutter state of the blade and avoid damage to the blade caused by long-term vibration. Of course, this application also can not set up and fill mouth 12, under the condition that does not set up and fill mouth 12, can directly pack the damping fluid inside holding chamber 11, sealing operation, and this kind of condition is unfavorable for carrying out the operation of changing to the damping fluid when needing to change the damping fluid. In the embodiment of the present application, a through hole is provided at the bottom of the blade corresponding to the filling opening 12, and when the damping fluid needs to be replaced, the damping fluid is replaced through the through hole.

In some embodiments, providing unevenness and uniform variation on the curved partition plate 20 or roughening the surface of the curved partition plate 20 increases the surface area of the curved partition plate 20, thereby allowing the damping fluid to flow in contact with the curved partition plate 20 for a longer time, and increasing the damping by increasing the frictional force between the damping fluid and the curved partition plate 20 when flowing.

In order to realize when blade 100 flutters, spin 30 increases the damping in the damping fluid friction, when the blade is rotatory, in order to guarantee the security of blade, the less damping of trying to get to the greatest extent avoids being heated for a long time and causes the damage to the blade, based on this, this application setting allows spin 30 free motion when blade 10 flutters, when blade 100 is rotatory or stops, carry on spacingly to spin 30, can control spin 30's restraint state through mechanical control's mode, for example: the limiting baffle can also control the restraining state of the rolling ball 30 in a magnetic field induction mode.

Thus, in some embodiments, the ball 30 can comprise: a magnetic material, an electromagnet assembly 40 is provided at one side of the damper housing 10 in the width direction, the electromagnet assembly 40 includes: the electromagnetic relay 41 is provided on any one of the outer side surfaces of the damper housing 10 in the width direction along the damper housing 10.

In the present embodiment, the electromagnet assembly 40 can act directly on the magnetic material in the ball 30 to control the constrained state of the ball 30. An electromagnetic relay is provided on the outer side surface of the damper housing 10 for controlling the restraining state of the rolling ball 30. When the electromagnet assembly 40 is not operating, the ball 30 is free to move following the movement of the blade 100. When the electromagnet assembly 40 is operated, it generates a magnetic field that attracts the ball 30 against the inner side of the damper housing 10 to lock the ball 30.

In the embodiment of the present application, the electromagnetic force between the rolling ball 30 and the electromagnet assembly 40 needs to be set to be greater than the maximum vibration force to which the rolling ball 30 is subjected, and here, the corresponding magnetic field strength needs to be set to ensure that the rolling ball 30 does not separate from the inner wall surface of the damper housing 10 when the vane 100 rotates normally. In the embodiment of the application, the magnetic field strength is calculated by the following formula:

when the relay works, the following requirements are ensured: f _m ＞1.2F _v . Wherein, F _m Magnetic field force, F, generated for the relay on the ball _v The maximum vibration force to which the rolling ball is subjected when the blade vibrates, and the maximum vibration force F to which the rolling ball is subjected _v And (ma). Wherein m is the mass (unit kg) of the rolling ball, and a is a set threshold (unit m/s) when the blade flutters ^-2 )。

The magnetic field force required to be generated by the relay is obtained through the above, and the corresponding magnetic field strength B is obtained according to the following formula and is the magnetic induction strength (unit wb) required to be generated.

Wherein, mu ₀ For vacuum permeability, take constant 4 π 10 ^-7 wb, S is the cross-sectional area (unit m) ² )。

In the embodiment of the present application, the power supply of the electromagnet assembly 40 is the power supply at the hub center of the blade of the wind turbine generator system (the conventional wind turbine generators are equipped with power supplies at the hub center for powering the pitch mechanism of the blade 100), and the electromagnet assembly 40 is connected to the power supply through a power line.

In order to allow for sufficient coverage of the magnetic field generated by the electromagnetic relay 40, considering that the range over which the electromagnet assembly 40 acts is relatively limited, in some embodiments, the electromagnet assembly 40 further comprises: steel baffle 42, set up the lateral surface at damper housing 10 along damper housing 10 length direction, wherein, electromagnetic relay 41 sets up on steel baffle 42, make the unable area that covers damper housing 10 in magnetic field (the unable spin 30 that attracts of uncovered area) can not appear, the area in magnetic field that this application embodiment produced electromagnetic relay 41 through setting up steel baffle 42 enlarges, then rethread steel baffle 42 goes to attract spin 30, here, steel baffle 42 is equivalent to the bridge in transmission magnetic field.

Because of the difference in mass and stiffness distribution of the blade 100, there is a certain difference in acceleration and frequency when the blade 100 flutters at shutdown (compared with when the blade normally rotates or is stationary), in order to make the control more convenient and simple, in some embodiments, the damper further includes a controller and a vibration sensor 60; when the vibration sensed by the vibration sensor 60 is lower than a predetermined value, the controller controls the electromagnetic relay 41 to operate to magnetize the steel damper 42 so as to attract the rolling ball 30 to the inner wall surface of the damper housing 10 near the steel damper 42, and when the vibration is equal to or greater than the predetermined value, the electromagnetic relay 41 stops operating to release the rolling ball 30. When the blade 100 is in a normal rotation or static state, the rolling balls 30 are locked to stop moving, so that the aim of not increasing damping is fulfilled, and the heat of the damper 200 is prevented from affecting the safety of the blade 100.

In the embodiment of the present application, it is necessary to design a corresponding vibration determination condition in advance according to a difference between the mass and the stiffness distribution of the blade 100, and it is sufficient to distinguish the flutter state of the blade from other states by setting two determination conditions based on the vibration acceleration and the vibration frequency. Illustratively, the blade type of the present application, at a length of 60m, has a vibration acceleration of greater than 1.2m/s for blade 100 ² And the vibration frequency f is in the vicinity of the first-order yaw rate (± 6% in the range of hz), the blade 100 is set in the fluttering state. Wherein, the shimmy frequency can be obtained by the following method: the natural frequency and corresponding mode shape of each blade is different due to differences in mass and stiffness distributions of the blade 100, where the natural frequency is attributed to the inherent properties of each blade, such as: first order natural frequency, second order natural frequency, third order natural frequency. During engineering calculation, the multi-order natural frequency and the corresponding vibration mode of the blade can be obtained. The type of the natural frequency is judged according to the matrix type, for example: wave vibration mode, torsional vibration mode, and shimmy vibration mode. And observing the vibration modes corresponding to the natural frequency of the blade in sequence, recording the vibration modes as the first-order shimmy frequency of the blade when the deformation in the shimmy direction exists for the first time, recording the vibration modes as the second-order shimmy frequency of the blade when the deformation in the shimmy direction exists for the second time, and repeating the steps to obtain the Nth-order shimmy frequency.

In some embodiments, a vibration sensor 60 is provided for acquiring vibration acceleration and vibration frequency, and the controller determines the state of the blade based on the acquired vibration acceleration and vibration frequency, thereby controlling the opening or closing of the electromagnetic relay 41, and further controlling the locking or free movement of the ball 30. The damper provided by the embodiment of the application is characterized in that a magnetic material such as iron, nickel, cobalt and the like is arranged as an inner core of the rolling ball 30, rubber is coated on the outer surface of the rolling ball 30 to serve as the outer surface of the rolling ball 30, the electromagnet assembly 40 does not work under the condition that the blade vibrates, namely the electromagnet assembly 40 does not generate a magnetic field, and the rolling ball 30 is free at the moment and can move in damping liquid to increase damping. In the rotating or stopping state of the blade, the electromagnet assembly 40 works, that is, the electromagnet assembly 40 generates a magnetic field to act on the rolling ball 30, at this time, the rolling ball 30 does not move, but the damping liquid in the accommodating cavity 11 theoretically shakes and rubs with the wall surface to generate damping, so that the damping effect on vibration is achieved. However, since the volume of the damping fluid of the present application accounts for 80% -90% of the volume of the accommodating chamber 11, the space for the fluid to flow in the accommodating chamber 22 is relatively small, and the generated damping is relatively small. On the other hand, when the blade 100 is in a normal rotation state, if damping is simply increased, the damping effect on vibration can be achieved, but the damping is increased by increasing damping with one taste, corresponding heat generation is also increased, the safety of blade operation can be directly influenced, and the risk is too high. The present invention is advantageous over a conventional type damper in that the amount of damping can be adjusted according to the state of the blade 100.

During the operation of the wind driven generator, the blade 100 rotates all the time, in the process, the flapping deformation of the blade 100 is large, the swing deformation of the swing matrix is small, and at the moment, the damping liquid in the damper slowly flows. Although the surface area of the damper is large and has good heat dissipation capacity, the damper generates heat due to long-term continuous operation of the unit and halt vibration. In order to avoid that the damping fluid formed by the viscous liquid and the damper housing 10 expand due to temperature rise after the long-term vibration of the blade 100, and thus threaten the reliability of the damper and the surrounding adhesive, in some embodiments, the damper further comprises a heat sink disposed outside the damper housing 10. In the embodiment of the application, the damper body 10 is cooled by the radiator, so that the influence of temperature rise on the safety of the blade is avoided.

In some embodiments, the radiator is an air-cooled radiator, the damper further includes a temperature sensor 70 and a fan 80 disposed at one side of the radiator, the temperature sensor 70 is disposed on an outer wall surface of the damper housing 10 or in the accommodating chamber 11, the controller controls the fan 80 to be activated when a temperature sensed by the temperature sensor 70 exceeds a predetermined value, the damper and related components are cooled by delivering air through the fan 80, and the controller controls the fan 80 to be deactivated when the temperature sensed by the temperature sensor 70 does not exceed the predetermined value, thereby saving energy.

In the embodiment of the present application, the predetermined value may be set to 55 ℃. When the blade is in the initial state, the electromagnetic relay 41 works to magnetize the steel baffle 42, so that the rolling ball 30 in the damper is fixed on the inner side wall of the damper shell 10 close to one side of the steel baffle 42, and at the moment, the rolling ball 30 does not move along with the deformation of the blade 100. When the vibration sensor 60 detects that the blade 100 vibrates, the electromagnetic relay 41 stops working to release the ball 30, so that the ball 30 moves in the accommodating cavity 11 along with the vibration of the blade 100, contacts and rubs with the damping liquid and the bent partition plate 20, rapidly increases damping, further weakens the vibration amplitude of the blade 100, but at the same time, the damper gradually increases the temperature due to energy absorption. When the temperature sensor 70 detects that the temperature of the wall surface of the damper housing 10 exceeds a temperature threshold (about 55 ℃), the radiator is triggered to start operating.

In the embodiment of the application, the control of the radiator of the damper and the electromagnetic relay can be realized through the following modes:

the control of the whole damper involves two actuating mechanisms of the electromagnetic relay 41 and the radiator, and the vibration sensor 60 controls the two mechanisms according to the vibration judgment basis and the temperature judgment basis combined with the temperature sensor 70. The detailed control logic diagram is as follows.

S100, judging whether the blades rotate normally or are static and do not vibrate;

in the embodiment of the application, if the blades are in normal rotation or are still, the blades do not vibrate;

step S110 is performed.

And step S110, the relay works, and the rolling ball is fixed.

And step S120, judging whether the blade vibrates.

In the embodiment of the present application, if the blade is in the flutter state, step S130 is performed. If the blade is in the un-flutter state, the process continues to step S110.

And step S130, the relay does not work, and the rolling ball moves freely.

Step S140, determining whether the temperature is too high.

In the embodiment of the present application, if the temperature is too high, step S150 is performed. If the temperature is not high, the process continues to step S130.

Step 150, the heat sink is operated to reduce the surface temperature.

Referring to the above steps S100 to S150, the control of the entire damper can be realized.

In some embodiments, the damper case 10 is approximately cubic, the heat sink is disposed above an upper side outer surface in the thickness direction of the damper case 10, and the damper further includes a honeycomb core material panel 90 disposed on a lower side outer surface in the thickness direction of the damper case 10. During operation of the wind park, the blade 100 itself vibrates under wind loads, and the mounted damper inevitably produces additional vibration due to the flow of damping fluid and the movement of the ball 30. In order to reduce the secondary vibration of the blade caused by the vibration of the damper, a layer of honeycomb core material panel 90 with better vibration isolation performance is additionally adhered to the position where the damper is installed, the thickness of a core material layer can be selected to be 10-20mm according to the difference of core material types (aluminum, carbon fiber, polyester polymer and the like) in the honeycomb core material panel 90, the larger the thickness is, the better the vibration isolation performance is, but after a certain critical thickness is reached, the lifting effect is not obvious, the thickness of the core material layer is set to be 10-20mm, the better vibration isolation performance is ensured, meanwhile, the volume of the damper can be ensured by the thickness of the core material layer with proper thickness, and the weight of the damper is further reduced.

Based on the damper provided in each of the above embodiments, as shown in fig. 4 and fig. 6, the present application further provides a blade for a wind turbine generator system, where the blade 100 includes a blade shell and the damper 200 provided in each of the above embodiments, where the blade shell includes: a suction side shell B1 and a pressure side shell B2, and a damper 200 is provided inside the blade shell. Therefore, the beneficial effects of the damper in the above embodiments are achieved, and are not described herein again.

As shown in fig. 5, the mounting locations on the blade 100 include: the damper is mounted at any position of the blade tip 101, the blade root 102, the main web 103, the small trailing edge web 104, the trailing edge 105, the leading edge 106, the web 107, and the like, generally, when the blade flutters, the vibration strength of the blade tip 101 is large, theoretically, the damper is mounted at the position of the blade tip 101, and has a better damping effect on the flutter, while the mounting position of the blade tip 101 is limited, and the damper can be mounted at the leading edge 106, the trailing edge 105, or between the two webs 107 of the blade 100 based on the safety consideration.

With continued reference to FIG. 6, in some embodiments, the length direction of the damper 200 is arranged along the flapwise direction F1 of the blade 100 and the width direction of the damper is arranged along the edgewise direction F2 of the blade 100. When the blade vibrates, the rolling balls 30 move in each sub accommodating cavity along the shimmy direction F2, and the vibration can be effectively restrained.

In some embodiments, the damper 200 is mounted inside the suction side shell B1 of the blade 100 near the trailing edge of the blade tip location.

In some embodiments, the total weight of the damper 200 is 4% -7% of the original weight of the blade 100. In the present embodiment, the original weight of the blade 100 is the weight of the blade before the damper 200 is installed.

The blade for wind generating set that this application embodiment provided, attenuator 200's weight is overweight for blade 100 operational load is overweight, and in the operation of blade 100, has the potential safety hazard, and attenuator 200's weight is too light, and the damping effect is not good, and when blade 100 shimmys, the vibration suppression effect is not obvious, thereby probably causes the damage of blade 100 and its surrounding structure.

Based on the blade for the wind generating set provided by the various embodiments, the application further provides a wind generating set which comprises the damper provided by the various embodiments and/or the blade for the wind generating set provided by the various embodiments. Therefore, the beneficial effects of the damper and the blade for the wind generating set in the above embodiments are achieved, and the detailed description is omitted.

Although the embodiments of the present application have been described in detail above, those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the present application. It should be understood that modifications and variations may occur to those skilled in the art, which modifications and variations may be within the spirit and scope of the embodiments of the present application as defined by the following claims.

Claims

1. A damper, comprising:

a damper housing (10) forming an accommodation chamber (11) for accommodating a damping fluid;

the bent partition plates (20) extend along the width direction of the accommodating cavity (11), are arranged at intervals in the length direction of the accommodating cavity (11), divide the accommodating cavity (11) into a plurality of sub-accommodating cavities, and are provided with through holes so that the sub-accommodating cavities are communicated with one another;

a plurality of rolling balls (30) respectively arranged in the sub-accommodation cavities.

2. A damper as claimed in claim 1 wherein the ball (30) is made of a material comprising: a magnetic material, an electromagnet assembly (40) provided at one side of the damper housing (10) in a width direction, the electromagnet assembly (40) comprising: and an electromagnetic relay (41) provided on the outer side surface of the damper housing (10) in the width direction.

3. A damper according to claim 2, wherein said electromagnet assembly (40) further comprises: and the steel baffle plate (42) is arranged on the outer side surface of the damper shell (10) along the length direction of the damper shell (10), wherein the electromagnetic relay (41) is arranged on the steel baffle plate (42).

4. A damper as claimed in claim 3 further comprising a controller and a vibration sensor (60);

when the vibration sensed by the vibration sensor (60) is lower than a preset value, the controller controls the electromagnetic relay (41) to work to magnetize the steel baffle (42) so as to adsorb the rolling ball (30) to the inner wall surface of the damper shell (10) close to one side of the steel baffle (42), and when the vibration is equal to or larger than the preset value, the electromagnetic relay (41) stops working to release the rolling ball (30).

5. The damper according to claim 1, wherein the damper housing (10) is approximately cubic, and the damper further comprises a honeycomb core material panel (90) provided on a lower outer surface in a thickness direction of the damper housing (10).

6. The damper according to claim 2, wherein the damper shell (10) is further provided with a pouring port (12) for pouring the damping fluid into the accommodating chamber (11), the diameter of the rolling ball (30) is 20% -30% of the distance between two adjacent curved partition plates (20), the diameter of the rolling ball (30) is larger than that of the through hole, and the magnetic material comprises: iron, nickel or cobalt, the material of the rolling ball (30) also comprises: and the rubber is coated on the outer surface of the rolling ball (30).

7. The damper according to claim 1, characterized in that it further comprises a damping fluid in said containing chamber (11), said damping fluid occupying 80-90% of the capacity of said containing chamber (11), said damping fluid having a viscosity in the range of 300-500 centipoise at a standard atmospheric pressure of 25 ℃.

8. A blade for a wind park according to any of the claims 1-7, wherein the blade (100) comprises a blade shell and a damper (200) according to any of the claims 1-7 arranged inside the blade shell.

9. Blade for a wind park according to claim 8, wherein the length direction of the damper (200) is arranged along the flapwise direction (F1) of the blade (100) and the width direction of the damper (200) is arranged along the edgewise direction (F2) of the blade (100).

10. Blade for a wind park according to claim 9, wherein the damper (200) is mounted at the leading edge, the trailing edge or in between two webs of the blade (100).

11. Blade for a wind park according to claim 8, wherein the damper (200) is mounted inside the suction side shell of the blade (100) near the trailing edge of the blade tip position.

12. Blade for a wind park according to claim 8, wherein the total weight of the damper (200) is 4-7% of the original weight of the blade (200).

13. A wind park according to any of claims 1-7, or a blade for a wind park according to any of claims 8-12.