Blade vibration suppression device, blade assembly and wind generating set

Abstract

The embodiment of the invention provides a blade vibration suppression device, a blade assembly and a wind generating set, and the blade vibration suppression device comprises a wind blocking part which can increase the damping of a blade so as to suppress the vibration of the blade; the connecting piece is in a long strip shape, and the connecting piece is connected with the wind blocking piece, so that the wind blocking piece is connected to a blade of the wind generating set; the magnetic attraction assembly comprises a magnetic attraction piece and a matching piece, a disconnection position is arranged between the connecting piece and the wind blocking piece or the connection piece is provided with the disconnection position, the magnetic attraction piece is connected with one end of the disconnection position, the matching piece is connected with the other end of the disconnection position, and the magnetic attraction piece can lock the matching piece through magnetic attraction force so that the wind blocking piece can be installed on the blade. And the magnetic attraction piece can release the matching piece, so that the wind blocking piece can be detached from the blade. According to the blade vibration suppression device, the wind blocking piece is installed on the blade through the connecting piece and the magnetic attraction assembly, the wind blocking piece can be detached from the blade by controlling the magnetic attraction assembly, and detaching and recycling of the blade vibration suppression device are facilitated.

Description

Technical Field

[0001] The present disclosure relates to the technical field of wind power generation, and in particular to a blade vibration suppression device, a blade assembly and a wind power generator set. Background Art

[0002] The blades of large impeller units are sometimes stored in large quantities in the yard before being hoisted. Under certain wind conditions (such as high wind speed and wind direction perpendicular to the span direction), the blades will cause first-order vibration in the swing direction. When the vibration amplitude is large, it will cause the blades to touch the ground, causing damage to the blade shape and structure or even scrapping; in addition, long-term and large-scale vibrations will also cause fatigue load damage in this direction. At present, the main solution is to set a mesh sleeve on the blade tip. The blade tip mesh sleeve can change the aerodynamic performance of the blade, produce a turbulent effect on the blade surface, and achieve vibration suppression of the blade. However, the mesh sleeve vibration suppression solution has the disadvantages of being difficult to disassemble, high cost, and cannot be reused. Summary of the invention

[0003] The present disclosure aims to at least solve the problem in the above-mentioned prior art or related technology that blade vibration can easily cause damage to the blade shape and structure or even scrap it, and the existing solution of suppressing vibration by installing a mesh sleeve on the blade has the disadvantages of being difficult to disassemble, high cost, and non-reusable.

[0004] To achieve the above-mentioned purpose, a first aspect embodiment of the present disclosure provides a blade vibration suppression device, which includes: a wind blocker, which can increase the damping of the blade, thereby suppressing the vibration of the blade; a connecting member, which is in the shape of a long strip and is connected to the wind blocker so that the wind blocker is connected to the blade of the wind turbine generator set; a magnetic attraction component, which includes a magnetic attraction component and a matching member, there is a disconnection between the connecting member and the wind blocker or there is a disconnection on the connecting member, the magnetic attraction component is connected to one end of the disconnection, and the matching member is connected to the other end of the disconnection, the magnetic attraction component can lock the matching member by magnetic attraction force so that the wind blocker can be installed on the blade, and the magnetic attraction component can also release the matching member so that the wind blocker can be removed from the blade.

[0005] In some embodiments, the blade vibration suppression device further includes a controller, and the controller can control the magnetic attraction component to lock with the matching component or release the matching component through magnetic force.

[0006] In some embodiments, the magnetic attraction member includes an electromagnet; and / or the matching member includes an electromagnet or a magnetic material; wherein the controller is capable of controlling the magnetization and demagnetization of the electromagnet.

[0007] In some embodiments, the magnetic attraction member includes an electromagnet, a locking pin and a sliding member, the sliding member is arranged on one side of the electromagnet, the middle part of the sliding member has a accommodating cavity, a pin hole is arranged on the sliding member, the locking pin is fixedly connected to the electromagnet and can extend into the accommodating cavity through the pin hole; the matching member includes a lock buckle, and when the magnetic attraction member and the matching member are locked, the lock buckle is installed in the accommodating cavity and the locking pin is inserted into the lock buckle; wherein, when the electromagnet is energized, it can absorb the sliding member so that the sliding member fits with the electromagnet, thereby allowing the locking pin to be inserted into the lock buckle, and when the electromagnet is de-energized, it can release the sliding member so that the sliding member and the electromagnet are separated, thereby separating the locking pin from the lock buckle.

[0008] In some embodiments, an opening is provided on the side wall of the accommodating cavity, and the lock buckle can enter or move out of the accommodating cavity through the opening. The lock buckle is provided with a lock hole, and the lock pin can be inserted into the pin hole.

[0009] In some embodiments, the magnetic attraction component also includes: a battery, which can be electrically connected to the electromagnet; a remote control signal receiver, which receives a control signal from the controller and electrically connects or disconnects the battery from the electromagnet according to the control signal.

[0010] In some embodiments, both the magnetic element and the matching element are permanent magnets, and the controller can drive one of the magnetic element and the matching element to move so that the magnetic element and the matching element are magnetically attracted or repelled.

[0011] In some embodiments, the blade vibration suppression device further includes: a protective plate, which is arranged at least one of between the wind blocking member and the trailing edge of the blade, between the connecting member and the blade, and between the magnetic member and / or the matching member and the blade.

[0012] In some embodiments, a through hole is provided on the protective plate, and the connecting member passes through the through hole and fastens the protective plate to the blade.

[0013] In some embodiments, the connecting member includes a plurality of binding ropes, each binding rope is provided with at least one breaking point, and there are a plurality of magnetic suction components, each of which is respectively provided at each breaking point.

[0014] In some embodiments, the binding ropes include cross binding ropes and annular binding ropes, the wind blocker is roughly square, and its two ends are respectively covered on the pressure side and the suction side of the blade, and two corners of the wind blocker are located on the pressure side of the blade, and the other two corners are located on the suction side of the blade. On each of the pressure side and the suction side, the cross binding ropes bring the two corners of the wind blocker close to each other, thereby forming an air inlet opening between the two corners of the wind blocker, and the annular binding ropes are connected to the two side edges of the middle part of the wind blocker, and are wrapped around the circumference of the blade to prevent the wind blocker from moving in the span direction of the blade.

[0015] In some embodiments, one side of the wind blocking member can be formed into a wind-raising concave surface, so that when the wind-raising concave surface is a windward surface, the damping of the blade is increased, thereby suppressing the vibration of the blade.

[0016] In some embodiments, the wind blocking member is a flexible sheet, which is formed into a bag-like shape with an air inlet opening on the surface of the blade. Under the action of external airflow, the flexible sheet can be expanded to suppress the vibration of the blade.

[0017] In some embodiments, the wind blocking member is made of a hard material, and the wind blocking member is bent to form a curved surface structure, and the inner surface of the curved surface structure is a wind-catching concave surface, which can increase the damping of the blade, thereby suppressing the vibration of the blade.

[0018] In some embodiments, there are multiple wind blocking members, which can be arranged at intervals along the span direction of the blade.

[0019] In some embodiments, a plurality of ventilation holes are provided on the wind blocking member for adjusting the wind resistance of the wind blocking member.

[0020] In some embodiments, based on the case where the wind blocker is a flexible sheet, the blade vibration suppression device further includes a bracket, which is located on the side of the wind blocker facing the blade, and is used to prop the wind blocker open. A second aspect of the present disclosure provides a blade assembly, including a blade, and the blade assembly further includes a blade vibration suppression device as described in any of the above embodiments, and the blade vibration suppression device is installed on the leading edge side and / or the trailing edge side of the blade.

[0021] The blade assembly provided in the embodiment of this aspect has the blade vibration suppression device of any of the above embodiments, and thus has the beneficial effects of any of the above embodiments, which will not be described in detail here.

[0022] A third aspect of the present disclosure provides a wind turbine generator set, the wind turbine generator set comprising a blade assembly as described in any one of the above embodiments.

[0023] The wind turbine generator set provided in the embodiment of this aspect has the blade assembly of any of the above embodiments, and thus has the beneficial effects of any of the above embodiments, which will not be described in detail here.

[0024] The blade vibration suppression device provided in the embodiment of this aspect is based on the characteristic that wind resistance is positively correlated with wind speed. A wind-blocking member is arranged on the blade, so that the damping of the blade is increased under the action of the wind-blocking member, thereby solving the problem of yard vibration caused by strong winds. At the same time, the strength of each component is considered to ensure that each component does not fail under strong wind conditions. Furthermore, the wind-blocking member is installed on the blade through a connecting member and a magnetic suction component, and the wind-blocking member can also be disassembled from the blade by controlling the magnetic suction component, which facilitates the disassembly and recycling of the blade vibration suppression device. Specifically, the magnetic suction component includes a magnetic suction member and a matching member, and there is a disconnection between the connecting member and the wind-blocking member. The magnetic suction member is connected to one of the connecting member and the wind-blocking member, and the matching member is connected to the other of the connecting member and the wind-blocking member. The magnetic suction member can lock the matching member through magnetic attraction so that the wind-blocking member can be installed on the blade. The magnetic suction member can also release the matching member so that the connection between the connecting member and the wind-blocking member is disconnected, thereby allowing the wind-blocking member to be removed from the blade. Alternatively, there is a disconnection on the connecting piece, the magnetic component is connected to one end of the disconnection on the connecting piece, and the matching component is connected to the other end of the disconnection on the connecting piece. The magnetic component can lock the matching component by magnetic attraction so that the wind blocker can be installed on the blade. The magnetic component can also release the matching component, so that the connection between the disconnection points of the connecting piece is disconnected, thereby allowing the wind blocker to be removed from the blade.

[0025] Additional aspects and / or advantages of the present general inventive concept will be set forth in part in the following description and in part will be apparent from the description or may be learned through practice of the present general inventive concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and other objects and features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings which exemplarily illustrate an example, in which:

[0027] Figure 1 is a schematic structural diagram of a blade vibration suppression device installed on a blade according to an embodiment of the present invention;

[0028] Figure 2 is another structural schematic diagram of a blade vibration suppression device installed on a blade according to an embodiment of the present invention;

[0029] Figure 3 is a schematic structural diagram of a locking assembly of a blade vibration suppression device according to an embodiment of the present invention;

[0030] Figure 4 is a schematic structural diagram of a locking assembly of a blade vibration suppression device according to another embodiment of the present invention;

[0031] Figure 5 is a schematic diagram of a single blade vibration suppression device installed on the trailing edge side of a blade according to an embodiment of the present invention;

[0032] Figure 6 is a schematic diagram of a blade vibration suppression device according to an embodiment of the present invention after being blown up;

[0033] Figure 7 is a schematic diagram of a single blade vibration suppression device installed on the leading edge side of a blade according to an embodiment of the present invention;

[0034] Figure 8 is a schematic diagram of two blade vibration suppression devices respectively installed on the leading edge side and the trailing edge side of the blade according to one embodiment of the present invention;

[0035] Fig. 9 is a schematic diagram of two blade vibration suppression devices being relatively installed on the leading edge side and the trailing edge side of a blade according to an embodiment of the present invention;

[0036] Fig.10 is a schematic diagram of a blade vibration suppression device with ventilation holes according to an embodiment of the present invention;

[0037] Fig.11 It is a schematic diagram of the verification result of the vibration suppression effect of the blade vibration suppression device on the blade according to an embodiment of the present invention.

[0038] Fig.12 is a single vibration direction stall-induced flutter model according to an embodiment of the present invention;

[0039] Fig.13 is an arbitrary vibration direction stall-induced flutter model according to an embodiment of the present invention;

[0040] Fig.14 is a simulation diagram of the effect of a blade vibration suppression device on a flow field on a blade surface according to an embodiment of the present invention;

[0041] Fig.15 is another simulation diagram of the effect of the blade vibration suppression device on the flow field on the blade surface according to one embodiment of the present invention;

[0042] Fig.16 and Fig.17 Schematic diagrams showing the results of calculating the damping coefficient of a blade without the vibration suppression device of the present invention and a blade with the vibration suppression device of the present invention using field parameters are shown respectively.

[0043] Figures 1 to 17 Description of reference numerals:

[0044] 10 wind blocks, 110 wind concave surfaces, 120 ventilation holes,

[0045] 20 connectors, 210 cross tying ropes, 220 ring tying ropes,

[0046] 30 blades, 310 suction side, 320 pressure side, 330 trailing edge side, 340 leading edge side,

[0047] 40 Magnetic attraction component, 410 Magnetic attraction part, 411 Electromagnet, 412 Lock pin, 413 Sliding part, 4131 Receiving cavity, 4132 Opening, 4133 Pin hole, 414 Remote control signal receiver, 415 Battery, 420 Matching part, 421 Lock buckle, 422 Lock hole. DETAILED DESCRIPTION

[0048] The following specific embodiments are provided to help the reader gain a comprehensive understanding of the methods, devices and / or systems described herein. However, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be clear after understanding the disclosure of the present application. For example, the order of operations described herein is only an example and is not limited to those orders set forth herein, but can be changed as will be clear after understanding the disclosure of the present disclosure, except for operations that must occur in a specific order. In addition, for greater clarity and simplicity, descriptions of features known in the art may be omitted.

[0049] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided to illustrate only some of the many possible ways to implement the methods, devices, and / or systems described herein, which will be clear after understanding the disclosure of the present disclosure.

[0050] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more.

[0051] Although terms such as "first", "second", and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions should not be limited by these terms. Instead, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, first component, first region, first layer, or first portion referred to in the examples may also be referred to as the second member, second component, second region, second layer, or second portion.

[0052] In the specification, when an element such as a layer, a region or a substrate is described as being “on”, “connected to” or “coupled to” another element, the element may be directly “on”, “connected to” or “coupled to” another element, or one or more other elements may be present therebetween. Conversely, when an element is described as being “directly on”, “directly connected to” or “directly coupled to” another element, other elements may not be present therebetween.

[0053] The terms used herein are only used to describe various examples and are not intended to limit the disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "comprise", "include" and "have" indicate the presence of the described features, quantities, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof. The term "plurality" represents any number of two and more than two.

[0054] The definitions of directional terms such as "upper", "lower", "top" and "bottom" in the present disclosure are all based on the directional definitions when the product is in normal use and placed upright.

[0055] Unless otherwise defined, all terms used herein, including technical terms and scientific terms, have the same meanings as those generally understood by those skilled in the art to which the present disclosure belongs after understanding the present disclosure. Unless explicitly defined as such herein, terms such as those defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art and the present disclosure, and should not be interpreted in an idealized or overly formal manner.

[0056] Furthermore, in the description of examples, when it is considered that a detailed description of a well-known related structure or function would cause vague interpretation of the present disclosure, such a detailed description will be omitted.

[0057] The following will be combined Figures 1 to 17 The present invention introduces a blade vibration suppression device, a blade assembly and a wind turbine generator set provided in embodiments of the present invention.

[0058] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the first aspect of the present disclosure provides a blade vibration suppression device, which includes: a wind blocker 10, which can increase the damping of the blade 30, thereby suppressing the vibration of the blade 30; a connecting member 20, which is in the shape of a long strip, and is connected to the wind blocker 10, so that the wind blocker 10 is connected to the blade 30 of the wind turbine generator set; a magnetic suction component 40, including a magnetic suction component 410 and a matching component 420, there is a disconnection between the connecting member 20 and the wind blocker 10 or there is a disconnection on the connecting member 20, the magnetic suction component 410 is connected to one end of the disconnection, and the matching component 420 is connected to the other end of the disconnection, the magnetic suction component 410 can lock the matching component 420 by magnetic attraction, so that the wind blocker 10 can be installed on the blade 30, and the magnetic suction component 410 can also release the matching component 420, so that the wind blocker 10 can be removed from the blade 30.

[0059] The blade vibration suppression device provided by the embodiment of this aspect is based on the characteristic that wind resistance is positively correlated with wind speed, and a wind blocking member 10 is arranged on the blade 30. Furthermore, the wind blocking member 10 is installed on the blade 30 through the connecting member 20 and the magnetic suction assembly 40, and the wind blocking member 10 can also be disassembled from the blade 30 by controlling the magnetic suction assembly 40, so as to facilitate the disassembly and recycling of the blade vibration suppression device. Specifically, the magnetic suction assembly 40 includes a magnetic suction member 410 and a matching member 420, and there is a disconnection between the connecting member 20 and the wind blocking member 10. The magnetic suction member 410 is connected to one of the connecting member 20 and the wind blocking member 10, and the matching member 420 is connected to the other of the connecting member 20 and the wind blocking member 10. The magnetic suction member 410 can lock the matching member 420 by magnetic suction force so that the wind blocking member 10 can be installed on the blade 30. The magnetic suction member 410 can also release the matching member 420, so that the connection between the connecting member 20 and the wind blocking member 10 is disconnected, so that the wind blocking member 10 can be removed from the blade 30. Alternatively, there is a disconnection on the connecting member 20, the magnetic component 410 is connected to one end of the disconnection on the connecting member 20, and the matching component 420 is connected to the other end of the disconnection on the connecting member 20. The magnetic component 410 can lock the matching component 420 by magnetic attraction so that the wind blocker 10 can be installed on the blade 30. The magnetic component 410 can also release the matching component 420, so that the connection between the disconnections of the connecting member 20 is disconnected, thereby allowing the wind blocker 10 to be removed from the blade 30.

[0060] In some embodiments, Figure 1 , Figure 2 , Figure 5 , Figure 7 , Figure 8 , Fig. 9 and Fig.10As shown, the connecting member 20 connects the wind blocker 10 to the blade 30, so that there is a gap between the wind blocker 10 and the outer surface of the blade 30 in the working state, thereby increasing the damping of the blade 30 without changing the aerodynamic shape and aerodynamic performance of the blade 30. The wind blocker 10 is connected to the blade 30 by the connecting member 20, so that the wind blocker 10 and the outer surface of the blade 30 are relatively independent, and there is no need to match the outer contour of the blade 30 like a net bag. Therefore, it can be applied to blades 30 of different airfoils and has good versatility. In addition, when the blade vibration suppression device is not needed, the wind blocker 10 can be separated from the blade 30 by loosening the connecting member 20, which is convenient for disassembly and can be reused.

[0061] In addition, the wind-blocking member 10 is connected to the blade 30 by the connecting member 20, and there is no need to put it on the blade 30 like a net bag. Therefore, interference with pneumatic accessories on the blade 30 can be avoided, and the problem of interference with pneumatic accessories such as VG (Vortex Generator) causing damage to the VG and difficulty in installing and removing the net sleeve is solved.

[0062] It is worth noting that the application scenarios of the present invention include but are not limited to the storage of blades 30 in a yard, the blades 30 after hoisting and before grid connection, and the shutdown maintenance conditions during the operation of the blades 30.

[0063] Furthermore, in some embodiments, the blade vibration suppression device further includes a controller, and the controller can control the magnetic attraction component 410 to lock with the matching component 420 or release the matching component 420 through magnetic force.

[0064] In these embodiments, the controller is used to control the magnetic member 410 to lock or release the matching member 420, which is convenient for user operation. It is understandable that the controller can be a remote control device that can be used on the ground to remotely control the magnetic member 410, so that after the wind blocking member 10 is no longer needed, the controller can be controlled on the ground to disconnect the attraction between the magnetic member 410 and the matching member 420, so that the blade vibration suppression device is separated from the blade 30 and falls freely, realizing the automatic disassembly of the blade vibration suppression device, and there is no need to approach the blade 30 to disassemble the blade vibration suppression device, which is convenient for operation and avoids the danger of high-altitude operation.

[0065] In some embodiments, Figure 3As shown, the magnetic attraction member 410 includes an electromagnet 411; the matching member 420 includes an electromagnet 411 or a magnetic material; wherein the controller can control the electromagnet 411 to be energized and de-energized, so that it has magnetism and loses magnetism. When the electromagnet 411 is energized, it can have a magnetic attraction force, so that it can be connected to the matching member 420 through magnetic attraction. When the electromagnet 411 is de-energized, it will lose the magnetic attraction force, thereby releasing the matching member 420, and the two can be separated from each other. By controlling the energization and de-energization of the electromagnet 411, the connection or disconnection between the magnetic attraction member 410 and the matching member 420 can be controlled, which is convenient for the user to operate, making the operation of installing the wind blocking member 10 on the blade and the operation of removing it from the blade simple and convenient.

[0066] In some embodiments, the magnetic member 410 and the matching member 420 may both be permanent magnets, and the magnetic assembly further includes a driver, which may be a motor, the output shaft of which is connected to the magnetic member 410, thereby driving the magnetic member 410 or the matching member 420 to move or rotate. The controller can control the operation of the driver to control the driver to drive one of the magnetic member 410 and the matching member 420 to move, so that the magnetic member 410 and the matching member 420 have opposite magnetic poles or like magnetic poles facing each other, so as to attract or repel each other magnetically.

[0067] In these embodiments, when the blade vibration suppression device is installed on the blade 30, the opposite magnetic poles of the magnetic component 410 and the matching component 420 face each other, so that the magnetic component 410 and the matching component 420 are attracted to each other, thereby connecting the disconnection between the connecting component 20 and the wind blocker 10, or connecting the disconnection of the connecting component 20, so that the wind blocker 10 can be installed on the blade 30; further, when it is necessary to disassemble the blade vibration suppression device, the driver is used to control the magnetic component 410 or the matching component 420 to flip, so that the like magnetic poles of the magnetic component 410 and the matching component 420 face each other, the magnetic component 410 and the matching component 420 repel each other and separate from each other, thereby separating the disconnection between the connecting component 20 and the wind blocker 10, or separating the disconnection of the connecting component 20, and the wind blocker 10 is detached from the blade 30, thereby realizing automatic disassembly of the blade vibration suppression device. Alternatively, when the blade vibration suppression device needs to be disassembled, the magnetic member 410 or the matching member 420 may be controlled to move a certain distance so that the magnetic member 410 and the matching member 420 cannot attract each other. Similarly, the disconnection between the connecting member 20 and the wind blocking member 10 may be separated, or the disconnection of the connecting member 20 may be separated, and the wind blocking member 10 may be detached from the blade 30, thereby realizing the automatic disassembly of the blade vibration suppression device. In another specific embodiment of the present invention, Figure 4As shown, the magnetic attraction member 410 includes an electromagnet 411, a locking pin 412 and a sliding member 413. The sliding member 413 is arranged below the electromagnet 411. The middle part of the sliding member 413 has a accommodating cavity 4131. The sliding member 413 is provided with a pin hole 4133. The locking pin 412 is fixedly connected to the electromagnet 411 and can extend into the accommodating cavity 4131 through the pin hole 4133. The matching member 420 includes a locking buckle 421. The locking buckle 421 can be inserted into the accommodating cavity 4131, and the locking pin 412 can be inserted into the locking buckle 421. When the magnetic attraction member 410 and the matching member 420 need to be locked, the lock buckle 421 is installed in the accommodating cavity 4131 and aligned with the lock pin 412 when the electromagnet 411 is de-energized. The electromagnet 411 is energized to attract the sliding member 413, so that the sliding member 413 fits the electromagnet 411, so that the lock pin 412 is inserted into the lock buckle 421, and the lock buckle 421 is restricted in the accommodating cavity 4131 and cannot be withdrawn from the accommodating cavity 4131. When the electromagnet 411 is de-energized, the sliding member 413 can be released, so that the sliding member 413 is separated from the electromagnet 411, so that the lock pin 412 is separated from the lock buckle 421, and the lock buckle 421 can be withdrawn from the accommodating cavity 4131.

[0068] In these embodiments, a specific structural embodiment of the magnetic suction component 40 is specifically given, the magnetic suction component 410 includes an electromagnet 411, a locking pin 412 and a sliding component 413, the sliding component 413 is provided with a pin hole 4133, the locking pin 412 is fixedly connected to the electromagnet 411, and can extend into the accommodating cavity 4131 through the pin hole 4133, the cooperation between the locking pin 412 and the pin hole 4133 can play a guiding role, guiding the movement of the sliding component 413 relative to the electromagnet 411, and preventing the movement and deviation of the sliding component 413; when it is necessary to lock the magnetic suction component 410 and the matching component 420, the lock buckle 421 of the matching component 420 is inserted into the accommodating cavity 4131 and the locking pin 412 is inserted into the lock buckle 421, and then the electromagnet 411 is electrically attracted to the sliding component 413, so that the matching component 420 is fixed by the locking pin 412 and the sliding component 413.

[0069] In some embodiments, an opening 4132 is provided on the side wall of the accommodating cavity 4131, and the lock buckle 421 can enter or move out of the accommodating cavity 4131 through the opening 4132. The lock buckle 421 is provided with a lock hole 422, and the lock pin 412 can be inserted into the pin hole 4133. The locking connection between the magnetic element 410 and the matching element 420 is achieved by inserting the lock pin 412 into the lock buckle 421. Compared with the case where the magnetic element 410 and the matching element 420 are connected by magnetic attraction, the connection force is tighter and is not easy to be broken away due to excessive wind force. Furthermore, when the blade vibration suppression device is installed on the blade 30, when the electromagnet 411 is de-energized, the lock buckle 421 is inserted into the accommodating cavity of the sliding member 413 and aligned with the lock pin 412, and then the electromagnet 411 is electrically attracted to the sliding member 413 so that the sliding member 413 fits the electromagnet 411. In this state, the lock pin 412 is inserted into the lock buckle 421, and the magnetic member 410 and the matching member 420 are connected; and when the blade vibration suppression device needs to be disassembled, the electromagnet 411 is controlled to be de-energized to release the sliding member 413, so that the sliding member 413 is separated from the electromagnet 411, and the restriction of the sliding member 413 on the matching member 420 is released, so that the matching member 420 can be freed from the restriction of the lock pin 412, thereby realizing the separation of the matching member 420 from the magnetic member 410.

[0070] Furthermore, in some embodiments, the magnetic attraction member 410 further includes a guide rail, and the sliding member 413 can move along the rail, further limiting the movement path of the sliding member 413 .

[0071] Furthermore, a stopper is provided at one end of the accommodating cavity of the locking pin 412 into which the sliding member 413 is inserted, so as to limit the maximum displacement of the sliding member 413 relative to the locking pin 412, so that the sliding member 413 and the locking pin 412 will not separate, and the sliding member 413, the locking pin 412, and the electromagnet 411 are all connected together. As an example, optionally, the stopper can be a protrusion provided at one end of the locking pin 412 and protruding toward the outer periphery, and the width of the protrusion is greater than the width of the pin hole 4133, so as to prevent the protrusion from sliding out of the pin hole 4133, thereby preventing the sliding member 413 from sliding out of the locking pin 412. In addition, the locking pin 412 can be provided with an external thread, and the stopper can be a nut threadedly connected to the locking pin 412.

[0072] Furthermore, the magnetic attraction member 410 may also include a shell, in which the electromagnet 411, the locking pin 412 and the sliding member 413 are all arranged. The electromagnet 411 is fixed to the upper part of the shell, and the sliding member 413 is supported by the bottom wall of the shell. In this way, the sliding member 413 can also be limited by limiting the height of the shell, so that the sliding member 413 and the locking pin 412 will not separate.

[0073] In some embodiments, Figure 4As shown, the magnetic attraction component 40 also includes a battery 415 and a remote control signal receiver 414. The battery 415 can be electrically connected to the electromagnet 411; the remote control signal receiver 414 can receive a control signal from the controller and electrically connect or disconnect the battery 415 from the electromagnet 411 according to the control signal.

[0074] In these embodiments, the battery 415 can supply power to the electromagnet 411 and the remote control signal receiver 414 , and the remote control signal receiver 414 can control the electrical connection or disconnection between the battery 415 and the electromagnet 411 according to the control signal sent by the controller, thereby controlling the magnetic attraction of the electromagnet 411 .

[0075] The lock catch 421 and the magnetic member 410 can be disassembled only when the electromagnet 411 is separated from the sliding member 413 and the gap between the end of the lock pin 412 and the sliding member 413 is sufficient to allow the lock catch 421 to withdraw outward. Therefore, in order to facilitate the smooth withdrawal of the lock catch 421, when the electromagnet 411 loses power, the sliding member 413 can move in a direction away from the electromagnet 411. As an optional solution, the separation between the electromagnet 411 and the sliding member 413 can be achieved by at least one of gravity, magnetic repulsion, and spring thrust. Specifically, firstly, the sliding member 413 is arranged below the electromagnet 411, and the electromagnet 411 is fixed. After the electromagnet 411 is energized, the magnetic attraction force applied to the sliding member 413 by the electromagnet 411 can overcome the gravity of the sliding member 413 and thus be adsorbed together with the sliding member 413. When the electromagnet 411 loses power, the sliding member 413 moves downward under the action of gravity and separates from the electromagnet 411, thereby allowing the lock 421 to withdraw from the accommodating cavity of the sliding member 413. Secondly, the sliding member 413 can also be set as a permanent magnet or an electromagnet 411. When the electromagnet 411 is energized, it can face the opposite magnetic poles of the sliding member 413, and magnetically attract each other, so as to control the electric The magnetic poles of magnet 411 can make the like magnetic poles of sliding member 413 and electromagnet 411 face each other, so that the two repel each other. Under the action of magnetic repulsion, sliding member 413 moves away from electromagnet 411 and is separated from electromagnet 411. Thirdly, a spring is arranged between sliding member 413 and electromagnet 411, and electromagnet 411 is fixed. After electromagnet 411 is energized, the magnetic attraction force applied to sliding member 413 by electromagnet 411 can overcome the elastic force of the spring and be adsorbed together with sliding member 413. The spring is compressed. When electromagnet 411 loses power, sliding member 413 moves away from electromagnet 411 under the action of the elastic force of the spring and is separated from electromagnet 411.

[0076] In some embodiments, the blade vibration suppression device further includes: a protective plate, which is disposed at least one of between the wind blocking member 10 and the trailing edge of the blade 30, between the connecting member 20 and the blade 30, and between the magnetic member 410 and / or the matching member 420 and the blade 30. The protective plate can isolate the blade 30 from the wind blocking member 10, the connecting member 20, the magnetic member 410, and the matching member 420, thereby preventing the blade 30 from being scratched or impacted, and plays a role in protecting the blade 30.

[0077] In some embodiments, the protective plate is provided with a through hole, and the connector 20 passes through the through hole and fastens the protective plate to the blade 30. The protective plate is tightened on the blade 30 by the connector 20, which plays a role in fixing the position of the protective plate and facilitates the fixing of the protective plate.

[0078] In some embodiments, Figure 1 , Figure 2 , Figure 5 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the connecting member 20 includes a plurality of tying ropes, such as Figure 2 As shown, each binding rope is provided with at least one breaking point, and there are multiple magnetic suction components 40, which are respectively provided at each breaking point.

[0079] In these embodiments, a binding rope is selected as the connecting member 20. The binding rope has low cost and can be tied to the surface of the blade 30. It is fastened and fixed to the blade 30 by knotting or hooking, and the connection between the blade 30 is simple. A set of magnetic components 40 is provided at both ends of each disconnection, so that the disconnection of the binding rope can be connected by the magnetic components 40, which does not affect the bundling function of the binding rope. When the wind blocking member 10 needs to be removed, the magnetic component 410 and the matching component 420 of the magnetic component 40 are separated to form a break on the binding rope, so that the wind blocking member 10 can be separated from the blade 30. It can be understood that each binding rope can also have two, three or even more disconnections, as long as a set of magnetic components 40 is provided at each disconnection to connect the two disconnected ends.

[0080] In some embodiments, Figure 1 , Figure 2 , Figure 5 and Fig.10As shown, the binding ropes include a cross binding rope 210 and an annular binding rope 220. The wind blocking member 10 is roughly square, and its two ends are respectively covered on the pressure side 320 and the suction side 310 of the blade 30, and two corners of the wind blocking member 10 are located on the pressure side 320 of the blade 30, and the other two corners are located on the suction side 310 of the blade 30. On each side of the pressure side 320 and the suction side 310, the cross binding rope 210 brings the two corners of the wind blocking member 10 close to each other, thereby forming an air inlet opening between the two corners of the wind blocking member 10. The cross binding rope 210 is used to fix the chordwise position of the wind blocking member 10, and is cross-connected with the four corners of the wind blocking member 10. On the pressure side 320 of the blade 30, the cross-binding rope 210 is connected to the two corners of the wind-blocking member 10 and crosses each other, which can better fix the wind-blocking member 10. In the case where the wind-blocking member 10 is a flexible sheet, the cross-binding rope 210 can also make the two corners of the flexible sheet close to each other, thereby forming an air inlet opening between the two corners of the flexible sheet, so that wind can enter through the air inlet opening to open the flexible sheet. Similarly, the connection method on the suction side 310 of the blade 30 is generally the same as that on the pressure side 320 of the blade 30, which will not be described in detail here. The circumferential binding rope 220 is connected to the two side edges of the middle part of the wind-blocking member 10, and is fixedly wrapped around the circumference of the blade 30, which is used to fix the spanwise position of the wind-blocking member 10 and prevent the wind-blocking member 10 from moving in the spanwise direction of the blade 30. As an example, since the annular binding rope 220 is connected to both sides of the wind blocking member 10 , approximately the middle of the left and right sides of the wind blocking member 10 can be fixed on the blade 30 , thereby preventing the wind blocking member 10 from moving in the span direction of the blade 30 .

[0081] As an example, the tying rope may be a binding belt, a binding belt with a tightener, a rope, etc. The cross tying rope 210 may be provided as one, and the annular tying rope 220 may be provided as two.

[0082] In some embodiments, Figure 6 As shown, one side of the wind blocking member 10 can be formed into a wind-raising concave surface 110, so that when the wind-raising concave surface 110 is the windward surface, the damping of the blade 30 is increased, thereby suppressing the vibration of the blade 30. The wind-raising concave surface 110 can increase the wind resistance, so that the damping of the blade 30 is increased under the action of the wind blocking member 10, and the vibration problem of the yard caused by strong wind is solved.

[0083] Normally, when the airflow flows through the periphery of the blade 30, the airflow velocity on the suction side 310 of the blade 30 is greater than the airflow velocity on the pressure side 320 of the blade 30. According to the Bernoulli equation, the greater the gas flow rate, the smaller the pressure. Therefore, the pressure on the pressure side 320 of the blade 30 is greater, and there will be a certain pressure difference between the suction side 310 and the pressure side 320, so that the blade 30 obtains lift.

[0084] In some embodiments, the wind-driving concave surface 110 is at least arranged on the suction side 310 of the blade 30, which can block the airflow on the suction side 310 of the blade 30, so that the airflow forms a vortex on the suction side 310 of the blade 30, reducing the flow rate of the airflow, thereby increasing the pressure on the suction side 310 of the blade 30, and reducing the pressure difference between the suction side 310 and the pressure side 320 of the blade 30, so that the lift of the blade 30 is reduced, the system damping is increased, and the vibration of the blade 30 is suppressed.

[0085] Furthermore, in some embodiments, the wind-driving concave surface 110 also extends from the suction side 310 of the blade 30 to the pressure side 320 of the blade 30, so that the flow velocity of the airflow flowing through the pressure side 320 of the blade 30 is reduced, and the pressure difference between the pressure side 320 and the suction side 310 is reduced, so that the lift of the airfoil of the blade 30 is reduced and the system damping is increased.

[0086] In these embodiments, the wind-driving concave surface 110 is arranged on the suction side 310 of the blade 30 and the pressure side 320 of the blade 30, which can block the airflow on the suction side 310 and the pressure side 320 of the blade 30, so that the airflow can form vortices on the suction side 310 and the pressure side 320 of the blade 30, thereby reducing the flow rate of the airflow, thereby balancing the pressure on the suction side 310 and the pressure side 320 of the blade 30, reducing the pressure difference between the suction side 310 and the pressure side 320 of the blade 30, and achieving the purpose of suppressing the vibration of the blade 30.

[0087] According to the Bernoulli equation, the greater the gas flow rate, the smaller the pressure. The air flow speed on the pressure side 320 of the blade 30 surface is slow and the pressure is high, while the pressure on the suction side 310 is low, which will generate a pressure from the pressure side 320 toward the suction side 310, causing the blade 30 to swing in one direction; and when the wind conditions change, there is a probability that the pressure on both sides will shift. If the wind changes periodically, it will cause the blade 30 to swing frequently and produce vortex-induced vibration. By reducing the airflow velocity flowing through the surface of the blade 30, the pressure difference on both sides of the blade 30 can be reduced, thereby reducing vortex-induced vibration and suppressing the vibration of the blade 30.

[0088] In some embodiments, after the external airflow flows through the blade 30 and enters the wind-absorbing concave surface 110, a negative pressure area is formed on the side of the wind-absorbing concave surface 110 away from the blade 30. The negative pressure area formed on the side of the wind-absorbing concave surface 110 away from the blade 30 is conducive to supporting the wind-blocking member 10 made of flexible material, so that the wind-blocking member 10 is blown into a hemispherical curved surface shape, and on the other hand, a pressure difference is formed on both sides of the wind-blocking member 10, so that the wind-blocking member 10 can apply a pressure difference resistance roughly consistent with the vibration direction of the blade 30 to the blade 30, thereby suppressing the vibration of the blade 30.

[0089] In some embodiments, the wind blocking member 10 is a flexible sheet, which is surrounded by a bag-like shape with an air inlet opening on the surface of the blade 30. Under the action of external airflow, the flexible sheet can be stretched open, thereby suppressing the vibration of the blade 30. The wind blocking member 10 is a flexible sheet, which can be surrounded by a bag-like shape with an air inlet opening on the surface of the blade 30. When there is no airflow to support the flexible sheet, that is, when there is no wind or little wind, the flexible sheet naturally droops, and the flexible sheet located above the blade 30 is attached to the surface of the blade 30, and the flexible sheet located below the blade 30 is drooped under the blade 30 due to gravity; in the case of strong wind, the airflow can stretch the flexible sheet through the air inlet opening, so that the flexible sheet is blown into a hemispherical curved surface. The wind blocking member 10 made of a flexible sheet is small in size, light in weight, easy to store and transport, and has the characteristics of low cost and reusability. In addition, when there is no need to set up a blade vibration suppression device, the blade vibration suppression device can be detached from the blade 30 by disconnecting the connecting piece 20, which is convenient for disassembly. Moreover, since the above-mentioned flexible material is light in weight, the blade vibration suppression device can fall freely, and it is not easy to be broken when falling freely from a high altitude to the ground. It can be used repeatedly and is not easy to injure workers.

[0090] As an example, the flexible sheet is optionally a combination of any one or more of fabric or plastic cloth. The fabric may include canvas, polyester, nylon, Oxford and other relatively strong fabrics. The above-mentioned flexible material has the advantages of low cost, strong, light weight, easy storage, low transportation cost, etc., and can be recycled and reused.

[0091] In some embodiments, the wind blocker 10 is made of a hard material, and the wind blocker 10 is bent to form a curved surface structure, and the inner surface of the curved surface structure is a wind-raising concave surface 110, and the wind-raising concave surface 110 can increase the damping of the blade 30, thereby suppressing the vibration of the blade 30. The wind blocker 10 made of a hard material has the wind-raising concave surface 110 itself. Compared with a flexible sheet that needs to be blown by airflow, the wind blocker 10 made of a hard material can increase the wind resistance when the wind speed is low, further improving the vibration suppression effect.

[0092] As an example, optionally, the wind blocker 10 of hard material can be made of any one of glass fiber reinforced plastics, gypsum, and hard foam. In some embodiments, the wind blocker 10 can be formed by processes such as perfusion and hand lay-up.

[0093] As an example, the wind blocker 10 made of a hard material may be made of any one of PP, PET, PA6, PA66, ASA, PPO, PI, and PEEK. In some embodiments, the wind blocker 10 may be formed by injection molding, pultrusion, or the like.

[0094] In some embodiments, Figure 1 and Figure 2 As shown, there are multiple wind blocking members 10, which can be arranged at intervals along the span direction of the blade 30. This arrangement can reduce the length of each wind blocking member 10, avoid the length of a single wind blocking member 10 being too long and increasing the difficulty of installation, and ensure the vibration suppression effect of the blade 30.

[0095] Of course, according to some embodiments, Figure 5 and Figure 7 As shown, a single air blocking member 10 may also be provided, and the length of the air blocking member 10 in the span direction of the blade 30 may be set according to the actual vibration suppression needs. As an example, in the case of providing a single air blocking member 10, the length of the air blocking member 10 may be relatively large. In this case, multiple groups of connecting members 20 may be used to fix the air blocking member 10 on the blade 30 in the span direction of the blade 30 to ensure the connection strength between the air blocking member 10 and the blade 30. In this case, the single air blocking member 10 may also form multiple air inlet openings.

[0096] In some embodiments, Fig.10 As shown, the wind blocking member 10 is provided with a plurality of ventilation holes 120 for adjusting the wind resistance of the wind blocking member 10. The ventilation holes 120 are easy to process and can be directly punched on the wind blocking member 10. The wind resistance of the wind blocking member 10 can be reduced through a simple process, and the wind resistance of the wind blocking member 10 can be prevented from being too large to cause the connection member 20 to be broken, and the pressure of the connection member 20 on the local surface of the blade 30 to be too large to cause the surface of the blade 30 to be damaged.

[0097] In some embodiments, based on the case where the wind blocker 10 is a flexible sheet, the blade vibration suppression device further includes a bracket, which is located on the side of the wind blocker 10 facing the blade 30, and is used to prop the wind blocker 10 open. As an example, optionally, the bracket can be a plastic stick that can be elastically deformed, etc., to support the wind blocker 10. Since the wind blocker 10 itself also has a certain weight, it may not be able to be opened when the wind force is small, and therefore it is difficult to play a vibration suppression role. According to some embodiments of the present application, by providing a bracket, the wind blocker 10 is kept in an open state, so that the vibration of the blade 30 can be suppressed even when the wind force is small.

[0098] As an example, optionally, the bracket can be in an arc shape, so as to prop up the wind blocker 10 into a hemispherical shape; further, the bracket can be a foldable bracket, and when the blade vibration suppression device is not needed, the bracket is folded and the wind blocker 10 is not propped up, thereby saving space and facilitating transportation; when the blade vibration suppression device is needed, the bracket is propped up so that the bracket props up the wind blocker 10 into a hemispherical shape, thereby suppressing the vibration of the blade 30.

[0099] like Figure 1 , Figure 2 , Figures 5 to 10As shown, a second aspect of the present disclosure provides a blade assembly, including a blade 30 and a blade vibration suppression device as described in any one of the above embodiments, wherein the blade vibration suppression device is installed on the leading edge side 340 and / or the trailing edge side 330 of the blade 30 .

[0100] The blade assembly provided in the embodiment of this aspect has the blade vibration suppression device of any of the above embodiments, and thus has the beneficial effects of any of the above embodiments, which will not be described in detail here.

[0101] It is worth noting that if Figure 7 As shown, the blade vibration suppression device can be arranged on the leading edge side 340 of the blade 30, in which case the air inlet opening faces the trailing edge side 330; Figure 1 , Figure 2 , Figure 5 , Figure 6 and Fig.10 As shown, the blade vibration suppression device can also be arranged on the trailing edge side 330 of the blade 30, in which case the air inlet opening faces the leading edge side 340; of course, as shown in FIG. Figure 8 and Fig. 9 As shown, blade vibration suppression devices may also be provided on both the leading edge side 340 and the trailing edge side 330 of the blade 30 , so that the vibration suppression function can be exerted regardless of the direction from which the external wind blows.

[0102] Furthermore, the blade vibration suppression devices may be grouped according to their orientations. For example, the blade vibration suppression devices disposed on the leading edge side 340 of the blade 30 are grouped as the first group of blade vibration suppression devices, and the blade vibration suppression devices disposed on the trailing edge side 330 of the blade 30 are grouped as the second group of blade vibration suppression devices. Figure 8 As shown, the number of the first group of blade vibration suppression devices and the second group of blade vibration suppression devices can be approximately the same, and are alternately arranged in the span direction of the blade 30; alternatively, the number of the first group of blade vibration suppression devices is less than the number of the second group of blade vibration suppression devices, in which case they may not be arranged in an alternating manner.

[0103] Furthermore, at least a portion of the air inlet openings of the first set of blade vibration suppression devices and at least a portion of the air inlet openings of the second set of blade vibration suppression devices face each other. Fig. 9 As shown, the first group of blade vibration suppression devices and the second group of blade vibration suppression devices can be arranged overlappingly in the span direction of the blade 30, and the air inlet openings of the first group of blade vibration suppression devices and the second group of blade vibration suppression devices are directly opposite to each other; the first group of blade vibration suppression devices and the second group of blade vibration suppression devices can also be arranged partially overlappingly in the span direction of the blade 30, that is, a part of the air inlet opening of the first group of blade vibration suppression devices and a part of the air inlet opening of the second group of blade vibration suppression devices face each other.

[0104] It is worth noting that, since the relationship between wind resistance and wind speed is a quadratic positive correlation, the greater the wind speed, the greater the wind force acting on the wind blocking member 10, the greater the resistance generated, and the greater the increased damping of the blade 30 system. Therefore, by providing the wind blocking member 10, the wind resistance can be efficiently utilized to increase the damping of the blade 30, thereby avoiding stall-induced flutter of the blade 30.

[0105] In some embodiments, the blade vibration suppression device is installed in the range of 85% to 95% in the span direction of the blade 30. That is, the installation range of the blade vibration suppression device is in the range of 85% to 95% from the blade root to the blade 30. On the one hand, based on the characteristic that wind resistance is positively correlated with wind speed, the blade vibration suppression device is installed in the range close to the blade tip, which can utilize the characteristics of the high drag coefficient in the range close to the blade tip to solve the yard vibration problem caused by strong wind in the wind direction from the leading edge to the trailing edge and from the trailing edge to the leading edge; in addition, the installation range is in the range of 85% to 95% from the blade root to the blade 30, which can also avoid interference with aerodynamic accessories installed on the blade 30, such as vortex generators.

[0106] In some embodiments, the blade vibration suppression device is installed at one end near the tip of the blade 30, and the distance between the wind blocking member 10 and the blade tip is greater than or equal to 2m and less than or equal to 10m. Within this range, on the one hand, the range within 2m on one side near the tip of the blade 30 can be avoided. Generally speaking, the inner chord length of the blade 30 2m from the tip is too small, which is not convenient for installing the blade vibration suppression device. Therefore, the blade vibration suppression device is installed on the blade 30 2m away from the tip and installed inward in sequence; on the other hand, based on the characteristics that wind resistance is positively correlated with wind speed, the blade vibration suppression device is installed within a range of 10m near the tip of the blade. The characteristics of the high drag coefficient within the range near the tip of the blade can be used to solve the yard vibration problem caused by strong winds in the wind direction from the leading edge to the trailing edge and from the trailing edge to the leading edge. At the same time, the strength of each component is considered to ensure that each component does not fail under strong wind conditions; in addition, the installation range is from 2m to 10m from the tip of the blade, which can also avoid interference with aerodynamic accessories installed on the blade 30, such as vortex generators.

[0107] In some embodiments, Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10As shown, the wind blocker overlaps with the blade part and can cover 50% to 80% of the chord width of the blade. That is, the wind blocker 10 can cover at least a part of the chord width of the blade 30, that is, overlap with at least a part of the blade 30, for example, covering 50% to 80% of the chord length of the blade 30. Within this range, it covers a sufficient chord width of the blade 30, solves the yard vibration problem caused by strong wind in the wind direction from the leading edge to the trailing edge and from the trailing edge to the leading edge, can effectively play a vibration suppression effect, and will not be difficult to be blown up due to the excessive chord width of the wind blocker 10 covering the blade 30.

[0108] In some embodiments, Figure 1 , Figure 2 , Figure 6 , Figure 8 and Fig. 9 As shown, there are multiple blade vibration suppression devices, which are arranged at intervals along the span direction of the blade 30, and the distance between two adjacent blade vibration suppression devices is 20cm-50cm. This arrangement can avoid mutual interference between two adjacent blade vibration suppression devices, and will not be too far away to affect the vibration suppression effect.

[0109] Figure 5 , Figure 7 , Fig.10 The schematic diagram of a single blade vibration suppression device installed on the blade 30 is shown. Optionally, in actual application, 3 to 6 blade vibration suppression devices can be used, which are installed in sequence from 2 m away from the blade tip to the blade root, such as Figure 1 , Figure 2 , Figure 6 , Figure 8 and Fig. 9 shown.

[0110] In some embodiments, the width of each wind blocking member 10 in the span direction of the blade 30 is 1m-4m. Within this range, it has a sufficient length to effectively suppress vibration, but does not cause excessive resistance due to the excessive width of a single wind blocking member 10 in the span direction of the blade 30, which may easily break the connecting member 20.

[0111] In some embodiments, the blade vibration suppression device is laid with a width of 8m to 10m in the span direction of the blade 30. Within this range, it has a sufficient length to effectively suppress vibration, but does not interfere with other components on the blade 30 due to the excessive width of the blade vibration suppression device in the span direction of the blade 30.

[0112] The dynamic working process of the blade vibration suppression device of the embodiment of the present application is described below in conjunction with the accompanying drawings. Figure 5As shown, in the case of no wind or light wind, the wind blocking member 10 of the flexible material naturally droops, and the upper section is attached to the upper surface of the blade 30. Due to the fixation of the cross-binding rope 210, an inward closing is formed on the wind blocking member 10, and the lower section of the wind blocking member 10 is used as a whole by gravity and hangs below the lower surface of the blade 30.

[0113] Take the case where the air inlet opening of the wind blocker 10 faces the leading edge 340 of the blade 30 as an example. When a certain wind speed is reached, such as 8m / s or above, and the wind direction is from the leading edge to the trailing edge or at a certain angle, such as less than 45°, the wind blocker 10 (such as a canvas bag) will be blown into a hemispherical curved surface due to the pressure difference resistance. At the same time, the wind passing through the blade 30 will form turbulent vortices due to separation, causing the upper and lower sides of the blade 30 to shake. When the wind direction forms a certain angle with the chord direction of the blade 30, the wind resistance exerts a lateral force on the wind blocker 10, that is, a spanwise force component. At this time, Figure 5 The annular binding rope 220 in the embodiment of the present invention provides a constraint to prevent the blade vibration damping device from moving in the span direction. Figure 6 shown.

[0114] When the wind direction is from the trailing edge to the leading edge, or at a certain angle, such as less than 45°, and the wind direction is along the span direction of the blade 30, the shape of the canvas is slightly affected at low wind speeds. When the wind speed is high, such as greater than 10m / s, the canvas is affected by the wind and is pressed tightly against the surface of the blade 30.

[0115] It is understandable that the embodiment in which the air inlet opening of the air blocking member 10 faces the trailing edge side 330 of the blade 30 is similar to the above-mentioned embodiment in which the air inlet opening of the air blocking member 10 faces the leading edge side 340 of the blade 30, and will not be described in detail here.

[0116] like Fig.11 As shown, in a specific embodiment of the present invention, a 95m blade 30 using the blade vibration suppression device of the present invention is placed in a storage yard as a test object, and a test verification is carried out for more than 300 hours. The verification period includes winds of more than 18m / s, and the wind direction includes a certain angle between the leading edge and the trailing edge, and a certain angle between the trailing edge and the leading edge. Fig.11 As shown, Fig.11 The middle figure (a) is the original data collected by the acceleration sensor, and the figure below (b) is the vibration result after the original collected data is reset to zero. According to the figure, it can be clearly concluded that the maximum acceleration during the verification period is about 0.1g (g is the acceleration of gravity), which is less than the threshold value (0.15-0.2g). No obvious vibration occurred during the verification period of the unit of this embodiment.

[0117] In order to better understand the present invention, the principle of stall-induced flutter and the mechanism by which the vibration suppression device of the present invention can suppress vibration are briefly analyzed below.

[0118] Fig.12 It is a stall-induced flutter model with a single vibration direction. In this simplified model, the airfoil vibrates in a single degree of freedom along the direction perpendicular to the incoming flow.

[0119] According to the simplified single-degree-of-freedom model, vibration causes periodic changes in the angle of attack, which in turn causes periodic changes in the aerodynamic force. When the direction of the increase in aerodynamic force is the same as the direction of vibration, or in other words, there is a phase difference between the aerodynamic force and the vibration displacement within a vibration cycle, the aerodynamic force does positive work within a vibration cycle, resulting in the accumulation of total system energy, and the mechanical energy of the incoming flow is converted into the elastic potential energy of the bending deformation of the blade 30, resulting in a tendency for the deformation of the blade 30 to increase, which ultimately manifests as a self-excited vibration with a continuously increasing deflection of the blade 30. For example, at a large angle of attack, the blade 30 vibrates upward, and the angle of attack α 0 Reduce lift coefficient C L Increase, C L If the vibration direction component increases and its direction is the same as the vibration direction, the vibration will tend to increase.

[0120] According to the technical solution of the present invention, by providing a vibration suppression device, the pressure difference between the pressure side 320 and the suction side 310 of the blade 30 can be reduced, thereby reducing the lift and further reducing the energy that excites the flutter of the blade 30.

[0121] By generalizing the previous single-degree-of-freedom simplified model, the stall-induced flutter model of the airfoil in any vibration direction x can be obtained. Fig.13 The stall-induced flutter model of the airfoil in any vibration direction is shown. Since the aerodynamic forces in other directions do not work on the vibration, only the aerodynamic resultant force of the blade 30 airfoil in the vibration direction is discussed below. The aerodynamic resultant force Fx and F 0 It can be expressed by the following formula (2) and formula (3) respectively:

[0122]

[0123]

[0124] in,

[0125]

[0126] Based on equations (2) and (3), the aerodynamic force F under dynamic conditions is x On the aerodynamic force F in steady state 0 Perform linearization processing at the equilibrium point x=0, that is, perform a first-order Taylor expansion according to the following formula (4) to obtain the equivalent damping coefficient η of the model, which can be expressed by the following formula (5).

[0127] Fx ≈F 0 -ηx Formula (4)

[0128]

[0129] Among them, in the above formula (2), formula (3), formula (4), formula (5), the meaning of each parameter is as follows:

[0130] η-equivalent damping coefficient;

[0131] F x - Aerodynamic resultant force in unsteady state;

[0132] F 0 - aerodynamic resultant force in steady state;

[0133] x- vibration direction;

[0134] ρ - air density;

[0135] c-chord length;

[0136] W-the combined speed of the downflow wind speed and the vibration wind speed in the unsteady state;

[0137] W 0 -Incoming flow velocity in steady state;

[0138] C L - lift coefficient;

[0139] C D - drag coefficient;

[0140] α-angle of attack in unsteady state;

[0141] α 0 - Angle of attack in steady state;

[0142] φ - inflow angle in unsteady state;

[0143] φ 0 - inflow angle in steady state;

[0144] θ-angle between vibration direction and reference line;

[0145] C′ L - the gradient of the lift coefficient with respect to the angle of attack;

[0146] C′ D - Gradient of the drag coefficient with respect to the angle of attack.

[0147] It can be seen from formula (5) that, in addition to the vibration direction, other parameters that affect the vibration include parameters such as the angle of attack, the incoming flow velocity, the lift and drag coefficient and its gradient. When η is negative, the aerodynamic resultant force at the cross section of the blade 30 does positive work, resulting in instability. It can be seen from the expression (5) of η that the way to increase damping and improve stability can be to increase the drag coefficient, reduce the lift coefficient, and reduce the gradient of the lift and drag coefficients. In the present invention, by installing a vibration suppression device on the blade 30, it is possible to increase the drag coefficient, reduce the lift coefficient, and reduce the lift and reduce the gradient of the drag coefficient at the same time, thereby achieving the purpose of increasing damping and improving the stability of the blade 30.

[0148] In formula (5), C D The coefficient range of the term is larger than that of the other two terms. D The most efficient way to increase the damping coefficient is D When η is large and changes little with the angle of attack, it can ensure that η is always greater than zero at any large wind speed.

[0149] The expression of formula (5) can also be used to analyze Fig.12 The stall-induced flutter model with a single vibration direction is shown in FIG. 1 . In this model, since the vibration direction of the blade 30 section is perpendicular to the incoming flow direction, θ-φ 0 =π / 2, substituting into formula (5), the part in the brackets of formula (5) can be simplified to 2(C D +C′ L ), it can be seen that when C′ L Negative and its absolute value is greater than C D When , the system is unstable. In this case, C D The coefficient of the term ranges from [2, 4], which is larger than the coefficients of the other two terms, indicating that the C D The most efficient way to increase the damping coefficient is D It is larger than the coefficients of the other two terms, so it can ensure that η is always greater than zero, thereby ensuring the stability of the system.

[0150] According to the embodiment of the present disclosure, a vibration suppression device is provided so that negative pressure is formed on the leeward side of the vibration suppression device. Due to the pressure difference on both sides, the blade 30 is subjected to an opposite pressure difference resistance in the vibration direction, thereby achieving the purpose of increasing C D The purpose is to more effectively increase the equivalent damping coefficient η and enhance the vibration suppression effect of the blade 30.

[0151] Fig.14 and Fig.15The velocity field result of the two-dimensional CFD (Computational Fluid Dynamics) simulation of the present invention is shown as follows. The existence of the vibration suppression device aggravates the surface flow separation between the pressure surface and the suction surface of the blade 30, making the surface velocities on both sides of the blade 30 tend to be consistent, thereby causing the pressure difference to decrease and the lift to decrease. According to formula (5), it can be determined that the damping coefficient can be increased, thereby enhancing the vibration suppression effect. At the same time, due to the obstruction of the blade vibration suppression device, the airflow velocity of the blade vibration suppression device on the side close to the blade 30 decreases and approaches 0, thereby forming a negative pressure on the other side, generating a large pressure difference resistance. Since the flow velocity on the side of the device close to the blade 30 at different attack angles is close to 0 and relatively stable, it shows a small resistance gradient. According to formula (5), it can be determined that the damping coefficient can be increased and the vibration suppression effect can be enhanced. The present invention has the most significant effect on increasing the drag coefficient by adopting the vibration suppression device. At a large angle of attack, the drag coefficient can be increased from 0.3-0.5 to 1.5-2.0.

[0152] It is worth noting that in an actual three-dimensional scene, the equivalent stiffness distribution of the blade 30 is inversely proportional to the cube of the length from the blade root, so the most efficient way is to set the blade vibration suppression device at the blade tip; the blade tip resistance part makes the direction of increase of the aerodynamic force opposite to the direction of speed, and the aerodynamic force does negative work, avoiding the increase and accumulation of total energy in the system, thereby achieving the effect of the damper.

[0153] Fig.16 and Fig.17 Based on the on-site parameters (wind speed, air density, etc.) of the disclosed embodiment, the corresponding aerodynamic data (C L , C D , C′ L , C′ D ), the calculation results obtained by applying the above model. Among them, Fig.16 The figure shows the calculation results when the vibration suppression device of the present disclosure is not installed, and the calculation uses basic aerodynamic data; Fig.17 The result after installing the vibration suppression device disclosed in the present invention is shown, and the modified aerodynamic data is used for calculation (relative to the basic aerodynamic data, the main difference is that the lift coefficient is reduced and the drag coefficient is increased). In the application scenario of this example, the vibration direction of the blade 30 occurs near the chord direction, corresponding to the dotted box area in the figure. By observing the dotted box areas in the two figures, it can be seen that the damping coefficient is significantly improved after installing the vibration suppression device, and is greater than 0 at all angles of attack.

[0154] According to the vibration suppression device of the present invention, the damping is increased by changing the flow on the surface of the blade 30 and by increasing the drag coefficient. Therefore, even under high wind speeds (for example, wind speeds greater than 20 m / s), vibration suppression by adding resistance can be achieved, thereby ensuring the vibration suppression effect and the structural strength of the device and solving the stability problem in the blade 30 yard and blade 30 shutdown maintenance conditions.

[0155] According to another aspect of the present invention, a wind turbine generator set having the above-mentioned vibration suppression device or blade assembly is also provided.

[0156] Although the embodiments of the present application have been described in detail above, those skilled in the art may make various modifications and variations to the embodiments of the present disclosure without departing from the spirit and scope of the present disclosure. It should be understood that, in the view of those skilled in the art, these modifications and variations will still fall within the spirit and scope of the embodiments of the present disclosure defined by the claims.

Claims

1. A blade vibration suppression device, It is characterized in that The blade vibration suppression device comprises: A wind blocking member (10), wherein the wind blocking member (10) is capable of increasing the damping of the blade (30), thereby suppressing the vibration of the blade (30); A connecting member (20), the connecting member (20) being in the shape of an elongated strip, the connecting member (20) being connected to the wind blocking member (10), so that the wind blocking member (10) is connected to a blade (30) of a wind turbine generator set; A magnetic attraction component (40) comprises a magnetic attraction component (410) and a matching component (420), wherein a disconnection is provided between the connecting component (20) and the wind blocking component (10) or a disconnection is provided on the connecting component (20), the magnetic attraction component (410) is connected to one end of the disconnection, and the matching component (420) is connected to the other end of the disconnection, the magnetic attraction component (410) can lock the matching component (420) by magnetic attraction force so that the wind blocking component (10) can be installed on the blade (30), and the magnetic attraction component (410) can also release the matching component (420) so that the wind blocking component (10) can be removed from the blade (30).

2. The blade vibration suppression device according to claim 1, It is characterized in that The blade vibration suppression device also includes a controller, which is capable of controlling the magnetic attraction component (410) to lock with the matching component (420) or release the matching component (420) through magnetic force.

3. The blade vibration suppression device according to claim 2, It is characterized in that The magnetic attraction member (410) includes an electromagnet (411); and / or The matching piece (420) includes an electromagnet (411) or a magnetic material; The controller is capable of controlling the magnetization and demagnetization of the electromagnet (411).

4. The blade vibration suppression device according to claim 2, It is characterized in that The magnetic attraction member (410) comprises an electromagnet (411), a locking pin (412) and a sliding member (413); the sliding member (413) is arranged on one side of the electromagnet (411); a receiving cavity (4131) is provided in the middle of the sliding member (413); a pin hole (4133) is provided on the sliding member (413); the locking pin (412) is fixedly connected to the electromagnet (411) and can extend into the receiving cavity (4131) through the pin hole (4133); The matching piece (420) comprises a lock buckle (421), and when the magnetic attraction piece (410) and the matching piece (420) are locked, the lock buckle (421) is installed in the accommodating cavity (4131) and the lock pin (412) is inserted into the lock buckle (421); When the electromagnet (411) is energized, it can absorb the sliding part (413) so that the sliding part (413) and the electromagnet (411) fit together, thereby allowing the lock pin (412) to be inserted into the lock buckle (421); when the electromagnet (411) is de-energized, it can release the sliding part (413) so that the sliding part (413) and the electromagnet (411) are separated, thereby allowing the lock pin (412) to be separated from the lock buckle (421).

5. The blade vibration suppression device according to claim 4, It is characterized in that An opening (4132) is provided on the side wall of the accommodating cavity (4131), and the locking buckle (421) can enter or move out of the accommodating cavity (4131) through the opening (4132). A locking hole (422) is provided on the locking buckle (421), and the locking pin (412) can be inserted into the pin hole (4133).

6. The blade vibration suppression device according to claim 4, It is characterized in that The magnetic attraction component (40) further includes: a battery (415), the battery (415) being electrically connectable to the electromagnet (411); A remote control signal receiver (414) receives a control signal from the controller and electrically connects or disconnects the battery (415) from the electromagnet (411) according to the control signal.

7. The blade vibration suppression device according to claim 2, It is characterized in that The magnetic attraction member (410) and the matching member (420) are both permanent magnets, and the controller can drive one of the magnetic attraction member (410) and the matching member (420) to move, so that the magnetic attraction member (410) and the matching member (420) are magnetically attracted to or repelled from each other.

8. The blade vibration suppression device according to claim 1, It is characterized in that The blade vibration suppression device further comprises: a protective plate, which is arranged at least one of between the wind blocking member (10) and the trailing edge of the blade (30), between the connecting member (20) and the blade (30), and between the magnetic attraction member (410) and / or the matching member (420) and the blade (30).

9. The blade vibration suppression device according to claim 8, It is characterized in that The protective plate is provided with a through hole, and the connecting member (20) passes through the through hole and fastens the protective plate to the blade (30).

10. The blade vibration suppression device according to claim 1, It is characterized in that The connecting member (20) comprises a plurality of binding ropes, each of which is provided with at least one breaking point, and the magnetic attraction components (40) are multiple, and the magnetic attraction components (40) are respectively provided at each breaking point.

11. The blade vibration suppression device according to claim 10, It is characterized in that The binding ropes include cross binding ropes (210) and annular binding ropes (220); the wind blocking member (10) is roughly square, with two ends respectively covering the pressure side (320) and the suction side (310) of the blade (30); two corners of the wind blocking member (10) are located on the pressure side (320) of the blade (30), and the other two corners are located on the suction side (310) of the blade (30); on each side of the pressure side (320) and the suction side (310), the cross binding ropes (210) bring the two corners of the wind blocking member (10) closer to each other, thereby forming an air inlet opening between the two corners of the wind blocking member (10); the annular binding ropes (220) are connected to the two side edges of the middle part of the wind blocking member (10), and are wrapped around the circumference of the blade (30) to be fixed, so as to prevent the wind blocking member (10) from moving in the span direction of the blade (30).

12. The blade vibration suppression device according to any one of claims 1 to 11, It is characterized in that One side of the wind blocking member (10) can be formed into a wind-raising concave surface (110) so as to increase the damping of the blade (30) when the wind-raising concave surface (110) is a windward surface, thereby suppressing the vibration of the blade (30).

13. The blade vibration suppression device according to claim 12, It is characterized in that The wind blocking member (10) is a flexible sheet, and the flexible sheet is formed into a bag shape with an air inlet opening on the surface of the blade (30). Under the action of external airflow, the flexible sheet can be expanded to suppress the vibration of the blade (30); or The wind blocking member (10) is made of a hard material. The wind blocking member (10) is bent to form a curved surface structure. The inner surface of the curved surface structure is a wind-absorbing concave surface (110). The wind-absorbing concave surface (110) can increase the damping of the blade (30), thereby suppressing the vibration of the blade (30).

14. The blade vibration suppression device according to any one of claims 1 to 11, It is characterized in that The wind blocking members (10) are multiple and can be arranged at intervals along the span direction of the blade (30); and / or The wind blocking member (10) is provided with a plurality of ventilation holes (120) for adjusting the wind resistance of the wind blocking member (10).

15. The blade vibration suppression device according to claim 13, It is characterized in that Based on the fact that the wind blocking member (10) is a flexible sheet, the blade vibration suppression device further comprises a bracket, which is located on a side of the wind blocking member (10) facing the blade (30) and is used to open the wind blocking member (10).

16. A blade assembly comprising a blade (30), It is characterized in that The blade assembly further comprises a blade vibration suppression device according to any one of claims 1 to 15, wherein the blade vibration suppression device is installed on the leading edge side (340) and / or the trailing edge side (330) of the blade (30).

17. A wind turbine generator set, It is characterized in that The wind turbine generator set comprises the blade assembly according to claim 16.

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