CN221144656U - Blade vortex-induced vibration damping device - Google Patents

Abstract

The utility model provides a blade vortex-induced vibration damping device, includes a net section of thick bamboo, net section of thick bamboo one end is sealed, the other end opening, and the cover is established at the middle part and the tip of blade, and a net section of thick bamboo includes radial locating rope, the chordwise fastening rope of intercrossing, and radial locating rope extends in the length direction of a net section of thick bamboo, and the chordwise fastening rope of many circumferences distributes on the length direction of a net section of thick bamboo, sets up on the net section of thick bamboo and presses down the piece that shakes, is used for fixing the connecting rope on the blade anchor point. The device provided by the utility model has a turbulent flow function, so that the purpose of vibration reduction of the blade is achieved; the device is wrapped in the blade tip and the blade, so that the problem that the blade resonates due to vortex-induced vibration can be restrained to a great extent; the utility model has lower cost, the net drum mainly adopts nylon ropes or hemp ropes, the vibration suppression block adopts foam or plastic, the manufacturing cost is low, the installation and the disassembly are convenient, the net drum can be repeatedly used, and the large-area popularization and the use are facilitated.

Description

Blade vortex-induced vibration damping device

Technical Field

The utility model relates to the technical field of wind power blade vibration reduction, in particular to a blade vortex-induced vibration damping device.

Background

The patent application number 202210286992.3 discloses a vortex-induced vibration suppression device, a blade assembly and a wind turbine generator, wherein the vortex-induced vibration suppression device comprises a vortex sleeve, and the vortex sleeve comprises a net barrel or a vortex belt and a vortex block. In the net barrel, the cross-sectional area of the net barrel gradually decreases from one end close to the blade root to one end of the blade tip, and the net barrel is used for wrapping the blade tip of the blade. The vortex block is connected in series with the vortex belt, and the vortex belt is spirally wound on the blade tip. The ratio of the length of the turbulent sleeve to the length of the blade tip is 1/3, 3/5 or 2/3, so that the vortex near the blade tip can be restrained from vibrating. The vortex-induced vibration suppression device further comprises a streamline vortex generator, wherein the vortex generator is used for being installed at the rear edge part of the blade, and the vortex generator is close to the part with the largest chord length of the blade and is arranged along the axial direction of the blade so as to change the airflow direction by using the vortex generator.

Fig. 1 is a schematic view of the influence of a spoiler on wake flow, wherein the left side is the vortex wake when the spoiler is not added, and the right side is the vortex wake when the spoiler is added. Simulation of vortex-induced vibration of the blade shows that the area where the vortex of the blade falls off is distributed in most areas from the middle part of the blade to the tip of the blade, the load of the blade root is increased after the vortex-induced vibration of the blade, the vortex is broken after the vibration suppression device is added, the vortex wake is obviously improved, and the load of the blade root is obviously reduced. The traditional vortex-induced vibration suppression device is mainly arranged on the blade tip, and has no suppression effect on vortex-induced vibration in the middle area of the blade.

Disclosure of utility model

In order to solve the technical problem that vortex-induced vibration cannot be eliminated in the middle area of the blade, the utility model provides a blade vortex-induced vibration damping device, which is used for solving the safety problem caused by blade vortex-induced vibration before wind power blade storage, transportation, installation and grid connection at present and effectively inhibiting the occurrence of vortex-induced vibration before wind power blade storage, transportation, installation and grid connection.

The aim of the utility model is realized by adopting the following technical scheme. The utility model provides a blade vortex-induced vibration damping device, which comprises a net barrel, wherein one end of the net barrel is closed, the other end of the net barrel is open, the net barrel is sleeved at the middle part and the tip part of a blade, the net barrel comprises radial positioning ropes and chordwise fastening ropes which are mutually crossed, the radial positioning ropes extend in the length direction of the net barrel, a plurality of circumferential chordwise fastening ropes are distributed in the length direction of the net barrel, and vibration suppression blocks and connecting ropes used for being fixed on anchor points of the blade are arranged on the net barrel.

Further, the circumference of the chordwise fastening cord gradually decreases in the direction from the open end to the closed end of the net drum.

Further, two or more than two turbulent flow belts are arranged on the net drum, a plurality of vibration suppression blocks are distributed on the turbulent flow belts, and the turbulent flow belts extend in the length direction of the net drum.

Further, the turbulent flow belt is positioned between two adjacent radial positioning ropes, and the turbulent flow belt extends in a wavy fold line shape.

Further, after the net barrel is sleeved on the blade, the turbulent flow belts are respectively positioned at two sides of the blade, and the turbulent flow belts are arranged between the radial positioning ropes positioned at the front edge of the blade and the radial positioning ropes close to the front edge of the blade.

Further, the turbulence belt is overlapped with the radial positioning rope, and the turbulence belt is respectively positioned at the front edge and two sides of the blade after the net barrel is sleeved on the blade.

Further, the vibration suppression blocks are in a spherical shape or an ellipsoidal shape, a plurality of groups of vibration suppression blocks are distributed on the turbulent flow belt, and each group of vibration suppression blocks comprises 2-5 adjacent vibration suppression blocks.

Further, a tightening rope is bundled between two adjacent chordwise fastening ropes.

Further, the vibration suppression blocks are arranged at the intersections of the radial positioning ropes and the chordwise fastening ropes, the vibration suppression blocks are triangular prisms, triangular pyramids or rectangular solids, the vibration suppression blocks are distributed along the length direction of the net drum, and the vibration suppression blocks are distributed on two sides of the blade.

Further, the radial positioning ropes are respectively positioned at the front edge, the position 1/3 of the PS surface from the front edge, the position 1/3 of the rear edge and the position SS surface from the front edge of the blade.

Compared with the prior art, the utility model has the following advantages:

The device provided by the utility model has a turbulence function, and the device is designed according to a simulation structure, is arranged in the blade tip and the blade of the blade, can disturb the flow field near the blade, change the air turbulence on the surface of the blade, inhibit vortex-induced vibration near the blade, and does not influence the aerodynamic shape and structure of the blade, thereby achieving the purpose of vibration reduction of the blade;

The vortex-induced vibration with great influence on the blade is mostly near the tip and the middle of the blade, so that the device is wrapped in the blade tip and the blade, and the problem that the blade resonates due to the vortex-induced vibration can be restrained to a great extent, so that the blade is not easy to damage due to serious swing, and fatigue damage of the blade due to the vortex-induced vibration is reduced;

The utility model has lower cost, the net drum mainly adopts nylon ropes or hemp ropes, the vibration suppression block adopts foam or plastic, the manufacturing cost is low, the installation and the disassembly are convenient, the net drum can be repeatedly used, and the large-area popularization and the use are facilitated.

The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model, as well as the preferred embodiments thereof, together with the following detailed description of the utility model, given by way of illustration only, together with the accompanying drawings.

Drawings

FIG. 1 is a schematic illustration of the influence of a spoiler on wake;

FIG. 2a is a schematic view of an embodiment of a blade vortex-induced vibration damping device according to the present utility model;

FIG. 2b is a schematic illustration of an embodiment of a vortex-induced vibration damping device for a blade according to the present utility model as applied to a blade;

FIG. 2c is a schematic cross-sectional view of FIG. 2 b;

FIG. 3a is a schematic development of a second embodiment of a blade vortex-induced vibration damping device according to the present utility model;

FIG. 3b is a schematic view of a second embodiment of a vortex-induced vibration damping device for a blade according to the present utility model;

FIG. 3c is a schematic cross-sectional view of FIG. 3 b;

FIG. 3d is a schematic view of another view of FIG. 3 b;

FIG. 4 is a schematic view of a third embodiment of a vortex-induced vibration damping device for a blade according to the present utility model;

Fig. 5 is a schematic diagram of a disturbance flow band in the first embodiment and the third embodiment of the present utility model.

[ Reference numerals ]

1-Blade, 100-first net barrel, 101-second net barrel, 110-first vibration suppression block, 111-second vibration suppression block, 120-chordwise fastening rope, 130-radial positioning rope, 140-disturbance flow belt, 200-connecting rope and 300-anchor point.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The vortex-induced vibration of the blade is mainly related to the cross-sectional shape and size of the blade, wind speed, incoming flow attack angle and the like, and the cross-sectional shape and size of the blade can be changed only through auxiliary tools because external conditions cannot be changed. The vortex-induced vibration is mainly caused by the fact that a plurality of sections of the blade simultaneously generate vortex shedding, so that the sections are changed and the section differentiation is ensured, and the problems can be effectively avoided.

The utility model provides three embodiments of a blade vortex-induced vibration damping device, which are used for solving the technical problems.

As shown in fig. 2a to 2c, the first embodiment of the present utility model includes a first net drum 100, wherein the first net drum 100 is used for sleeving the middle and the tip of the blade 1, and the first net drum 100 matches with the outer contours of the middle and the tip of the blade and wraps the middle and the tip of the blade.

The first net drum 100 comprises radial positioning ropes 120 and chordwise fastening ropes 130 which are mutually crossed and fixed, and one end of the first net drum 100 is open, and the other end is closed. After the first net drum 100 is installed, a plurality of chordwise fastening ropes 130 are distributed in the length direction of the blade, each chordwise fastening rope 130 is arranged on the blade in a surrounding mode, the circumference of each chordwise fastening rope 130 is gradually reduced in the direction from the blade root to the blade tip, the distance between two adjacent chordwise fastening ropes 130 is 1-2 m, and the distance between the two adjacent chordwise fastening ropes can be adjusted according to the length of the blade. The circumference of the chord-wise securing rope 130 is the same as its blade chord length at the cross-sectional location.

Radial positioning cords 120 extend along the blade length and are primarily used to determine the mounting location of the vibration suppression block and to enhance the toughness of the net drum. In the embodiment, 4 radial positioning ropes are arranged, and the radial positioning ropes are respectively positioned at the front edge, the position 1/3 of the PS surface from the front edge, the position 1/3 of the rear edge and the position 1/3 of the SS surface from the front edge of the blade.

In this embodiment, a disturbance flow band 140 is disposed on the first net drum 100, and the disturbance flow band 140 is shown in fig. 5, and an ellipsoid or a spherical first vibration suppression block 110 is connected in series with the disturbance flow band 140. In this embodiment, two spoiler bands 140 are disposed in total, after the spoiler bands 140 are fixed on the first net drum and the first net drum is mounted on the blade, the spoiler bands 140 are respectively located at two sides of the blade, and the spoiler bands 140 are disposed between the radial positioning ropes located at the front edge and the radial positioning ropes close to the front edge.

In the present embodiment, the first vibration suppression blocks 110 on the spoiler are arranged in pairs, and in other embodiments, 2 to 5 first vibration suppression blocks may be arranged on the spoiler in a group. A pair of first vibration suppressing blocks 110 is provided for each grid of the first net drum between the radial positioning ropes of the leading edge and the radial positioning ropes close to the leading edge, and the pair of vibration suppressing blocks of the adjacent grids are splayed. The turbulence belt is arranged between the two radial positioning ropes in a wavy fold line shape, and in the embodiment, the turbulence belt is intersected with the intersection point of the first net drum at the bending position.

In the present embodiment, the diameter of the first vibration suppressing block 110 ranges from 5cm to 20cm.

After the turbulence belt 140 is fixed with the first net drum 100, the first net drum 100 is sleeved on the surface of the blade and covers the blade tip and the blade.

After the first net drum 100 is installed, a connecting rope 200 is arranged at the opening of one side of the first net drum 100, which is close to the blade root, an anchor point 300 is arranged at the blade root, the other end of the connecting rope 200 is arranged on the anchor point 300, the first net drum is tightened, and the first net drum is fixed on the surface of the blade 1. In this embodiment, a connecting rope 200 is respectively disposed on two sides of the blade, and the connecting ropes 200 are respectively connected with corresponding anchor points.

As shown in fig. 3a to 3d, the second embodiment of the present utility model includes a second net drum 101, where the second net drum 101 has substantially the same structure as the first net drum 100, has the same installation relationship with the blade, and is connected to the anchor point on the blade through a connection rope. The second net drum 101 is different from the first net drum 100 in that: the second net drum 101 is not provided with a disturbance flow band, and the second vibration suppressing block 111 is provided at the intersection point of the radial positioning rope 120 and the chord-wise fastening rope 130 on the second net drum 101.

The second vibration suppressing block 111 is in the shape of a triangular prism, a triangular pyramid, or a rectangular parallelepiped, and is installed at the intersection point position of the radial positioning rope 120 and the chordwise fastening rope 130. In this embodiment, the second vibration suppressing blocks 111 are respectively distributed on the two radial fastening ropes 120, and after the second net drum 101 is mounted on the blades, the second vibration suppressing blocks are respectively arranged on the outer surfaces of the two blades.

In this embodiment, on the same radial fastening rope 120, adjacent second vibration suppressing blocks 111 are distributed in a splayed shape.

In the embodiment, the short side length of the second vibration suppressing block is 15 cm-40 cm, and the long side length is 1.5-2 times of the short side length.

In this embodiment, to prevent the second net drum from being excessively spaced from the blade surface, the second net drum is fastened in the blade chord direction using tightening ropes mounted between two adjacent chord direction tightening ropes 130.

As shown in fig. 4, the third embodiment of the present utility model includes a first net drum 100, where the first net drum 100 of the present embodiment has substantially the same structure as the first net drum 100 of the first embodiment, has the same installation relationship with the blade, and is connected to the anchor point on the blade by a connection rope.

In this embodiment, as shown in fig. 5, three turbulence bands are provided on the first net drum 100, and the three turbulence bands are parallel to three corresponding radial positioning ropes on the first net drum, and after the first net drum 100 is mounted on the blade, the three turbulence bands are respectively located at the front edge of the blade, 1/3 of the PS surface from the front edge, and 3/1 of the SS surface from the front edge.

In the present utility model, the radial positioning ropes and the chordwise fastening ropes in the first net drum 100 and the second net drum 101 are nylon ropes or hemp ropes, and the first vibration suppression block 110 and the second vibration suppression block 111 are foam or plastic.

In the utility model, when the connecting rope 200 is detached, the detachment can be completed.

In other embodiments of the utility model, the vibration suppression block (including the first vibration suppression block and the second vibration suppression block) can be installed inside the net barrel (including the first net barrel and the second net barrel), so that the phenomenon that the vibration suppression block is damaged and falls off due to high wind invasion when the vibration suppression block is installed outside the net barrel is avoided, and the vibration suppression block is installed inside the net barrel, so that the wind area of the net barrel is increased, and the vibration suppression effect is better.

The device provided by the utility model has a turbulence function, and the device is designed according to a simulation structure, is arranged in the blade tip and the blade of the blade 1, can disturb the flow field near the blade, change the air turbulence on the surface of the blade, inhibit vortex-induced vibration near the blade 1, and does not influence the aerodynamic shape and structure of the blade, thereby achieving the purpose of vibration reduction of the blade.

The vortex-induced vibration greatly influencing the blade 1 is mostly near the tip and the middle of the blade, so that the device is wrapped in the tip and the blade of the blade 1, and the problem that the blade resonates due to the vortex-induced vibration can be restrained to a great extent, so that the blade is not easy to damage due to serious swing, and fatigue damage of the blade due to the vortex-induced vibration is reduced.

The utility model has lower cost, the net drum mainly adopts nylon ropes or hemp ropes, the vibration suppression block adopts foam or plastic, the manufacturing cost is low, the installation and the disassembly are convenient, the net drum can be repeatedly used, and the large-area popularization and the use are facilitated.

The utility model further provides a blade assembly with the blade vortex-induced vibration damping device and a wind turbine generator.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the spirit and scope of the utility model as defined by the appended claims and their equivalents.

Claims (10)

1. The utility model provides a blade vortex-induced vibration damping device, includes a net section of thick bamboo, its characterized in that: the net barrel is closed at one end, is open at the other end, is sleeved at the middle part and the tip part of the blade, comprises radial positioning ropes and chordwise fastening ropes which are mutually crossed, the radial positioning ropes extend in the length direction of the net barrel, a plurality of circumferential chordwise fastening ropes are distributed in the length direction of the net barrel, and vibration suppression blocks and connecting ropes used for being fixed on anchor points of the blade are arranged on the net barrel.

2. A blade vortex-induced vibration damping device as claimed in claim 1, wherein: the circumference of the chordwise fastening rope is gradually reduced in the direction from the open end to the closed end of the net drum.

3. A blade vortex-induced vibration damping device as claimed in claim 1, wherein: two or more turbulent flow belts are arranged on the net drum, a plurality of vibration suppression blocks are distributed on the turbulent flow belts, and the turbulent flow belts extend in the length direction of the net drum.

4. A blade vortex-induced vibration damping device as claimed in claim 3, wherein: the turbulent flow belt is positioned between two adjacent radial positioning ropes, and the turbulent flow belt extends in a wavy fold line shape.

5. A blade vortex-induced vibration damping device as set forth in claim 4 wherein: after the net barrel is sleeved on the blade, the turbulent flow belts are respectively positioned at two sides of the blade, and the turbulent flow belts are arranged between the radial positioning ropes positioned at the front edge of the blade and the radial positioning ropes close to the front edge of the blade.

6. A blade vortex-induced vibration damping device as claimed in claim 3, wherein: the turbulence belt is overlapped with the radial positioning rope, and the turbulence belt is respectively positioned at the front edge and two sides of the blade after the net barrel is sleeved on the blade.

7. A blade vortex-induced vibration damping device as claimed in claim 3, wherein: the vibration suppression blocks are in a spherical shape or an ellipsoidal shape, a plurality of groups of vibration suppression blocks are distributed on the turbulent flow belt, and each group of vibration suppression blocks comprises 2-5 adjacent vibration suppression blocks.

8. A blade vortex-induced vibration damping device as set forth in claim 7 wherein: and binding a tightening rope between two adjacent chordwise fastening ropes.

9. A blade vortex-induced vibration damping device as claimed in claim 1, wherein: the intersection point of the radial positioning rope and the chordwise fastening rope is provided with vibration suppression blocks, the vibration suppression blocks are triangular prisms, triangular pyramids or cuboids, and are distributed along the length direction of the net drum, and the vibration suppression blocks are distributed on two sides of the blade.

10. A blade vortex-induced vibration damping device as claimed in claim 1, wherein: the radial positioning ropes are respectively positioned at the front edge, the position 1/3 of the PS surface from the front edge, the position 1/3 of the rear edge and the position of the SS surface from the front edge of the blade.