CN210290011U

CN210290011U - Bidirectional damping device for wind driven generator blade

Info

Publication number: CN210290011U
Application number: CN201920868556.0U
Authority: CN
Inventors: 鲁松; 张善堂; 徐卫新; 王蔚; 钮强胜
Original assignee: Nanjing Zhongyi Architectural Design Institute Co ltd
Current assignee: Nanjing Zhongyi Architectural Design Institute Co ltd
Priority date: 2019-06-10
Filing date: 2019-06-10
Publication date: 2020-04-10
Anticipated expiration: 2029-06-10

Abstract

The utility model discloses a two-way damping device for aerogenerator blade uses in aerogenerator blade field, and its technical scheme main points are: the fan blade main keel structure comprises two or more fan blade main keels arranged in a hollow blade, a main body pipe is arranged between every two adjacent main keels, a buffer cavity is arranged in each main body pipe, a mass block is arranged in each buffer cavity, a gap is formed between each two sides of each mass block in the vertical direction and the wall of each buffer cavity, and connecting plates connected in the main body pipes in a sliding mode are arranged on every two adjacent main keels; has the technical effects that: under the condition of basically not increasing the total weight of the hollow blade, the wind-induced vibration of the hollow blade and the fatigue damage of the main keel of the blade are effectively reduced, and the service life is prolonged.

Description

Bidirectional damping device for wind driven generator blade

Technical Field

The utility model relates to a aerogenerator blade field, in particular to two-way damping device for aerogenerator blade.

Background

The wind power generator is an electric power device which converts wind energy into mechanical work, and the mechanical work drives a rotor to rotate so as to finally output alternating current. The principle of wind power generation is that wind power drives windmill blades to rotate, and then the rotating speed is increased through a speed increaser, so that a generator is promoted to generate electricity. According to the current wind power generator technology, the power generation can be started at a breeze speed of about three meters per second.

The construction of a current industry fan blade is shown in detail in FIG. 1, including a hollow blade and a main keel. However, under the action of wind load and random wind attack angle, the fan blade will generate transverse and downwind vibration, which will cause fatigue damage to the fan blade and the fan body structure to a certain extent, and the service life of the fan will be reduced over time.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a two-way damping device for aerogenerator blade, its advantage: the vibration reduction can be carried out on the hollow blade in a two-way mode, the wind-induced vibration of the hollow blade and the fatigue damage of the main keel of the blade are effectively reduced, and the service life is prolonged.

The above technical purpose of the present invention can be achieved by the following technical solutions: the utility model provides a two-way damping device for aerogenerator blade, is including setting up two and above fan blade main joist in the cavity blade, adjacent two be equipped with the main part pipe between the main joist, the intraductal cushion chamber that is equipped with of main part, be equipped with the quality piece in the cushion chamber, the quality piece has the clearance along both sides and the cushion chamber wall of vertical direction, adjacent two all be equipped with the connecting plate of connection in the main part pipe that slides on the main joist.

Through the technical scheme, when the hollow blade vibrates in a transverse wind direction, the mass block moves in the buffer cavity in a direction opposite to the vibration direction due to the inertia effect, so that the gravity center of the hollow blade is changed, and the vibration frequency of the hollow blade is reduced; when the hollow blades vibrate in the downwind direction, the connecting plate slides in the main body pipe, so that the energy of the part can be dissipated, and the downwind vibration of the blades is reduced; and the bidirectional damping device can replace the original hollow blade inner transverse support, can effectively reduce the wind-induced vibration of the hollow blade and the fatigue damage of the main keel of the blade under the condition of basically not increasing the total weight of the hollow blade, and prolongs the service life.

The utility model discloses further set up to: the buffer cavity is internally provided with a buffer jacket layer, the buffer jacket layer is made of viscoelastic materials and covers the mass block, and the outer wall of the buffer jacket layer is connected with the cavity wall of the buffer cavity.

Through the technical scheme, the buffer sleeve layer is made of viscoelastic materials, so that viscoelasticity is achieved, the substructure formed by the mass block and the buffer sleeve layer is similar to a frequency modulation mass damper, when the hollow blade vibrates, the energy of the hollow blade can be consumed, the vibration of the hollow blade is further reduced, and the damping effect on the hollow blade is improved.

The utility model discloses further set up to: the two sides of the mass block, which face the two main keels, are provided with rubber pads, and two ends of each rubber pad are respectively abutted against the wall of the mass block and the wall of the buffer cavity.

Through above-mentioned technical scheme, the rubber pad is contradicted at the both ends of quality piece along length direction to can prevent quality piece lateral shifting and bump with the chamber wall of cushion chamber, reduce the quality piece and bump with the chamber wall of cushion chamber and make the cavity blade produce secondary vibration's possibility, and guarantee two-way damping device's steady operation.

The utility model discloses further set up to: two slides, two have all been seted up along length direction's both ends to the main part pipe the slide is all with cushion chamber intercommunication, two the connecting plate slides respectively and connects in two slides, the cushion chamber seals through the shutoff board with the intercommunication department of slide, the clearance has between shutoff board and the connecting plate.

Through above-mentioned technical scheme, the connecting plate has a longer displacement distance in the slide to the connecting plate reduces the stress between connecting plate and the main joist at slide displacement when the cavity blade vibrates, thereby guarantees cavity blade's structural stability.

The utility model discloses further set up to: the plugging plate is made of an elastic material.

Through the technical scheme, when the connecting plate moves too far and collides with the plugging plate, the plugging plate is made of the elastic material, so that the energy generated when the connecting plate collides can be greatly absorbed, and the probability of fluttering of the hollow blade is reduced.

The utility model discloses further set up to: the main tube is made of foamed aluminum material.

Through the technical scheme, the foamed aluminum is formed by adding the additive into pure aluminum or aluminum alloy and then through a foaming process, has metal and bubble characteristics, and has damping performance 5-10 times that of metal aluminum, so that the main body pipe and the connecting plate can form a viscoelastic damper, partial energy generated when the hollow blade vibrates can be effectively dissipated, and the probability of flutter is reduced.

The utility model discloses further set up to: the main body pipe is coated with a hard shell layer.

Through the technical scheme, the hard shell layer can protect the main body pipe and limit the external shape of the main body pipe, so that the connecting plate is limited in the hard shell layer, the main body pipe can be in closer contact with the connecting plate, and the energy generated when the connecting plate vibrates can be absorbed conveniently; in addition, the connecting plate can be prevented from causing internal vibration or structural damage to the bidirectional damping device due to overlarge vibration amplitude.

The utility model discloses further set up to: the connecting plate is detachably connected to the main keel through bolts.

Through above-mentioned technical scheme, through bolted connection between main joist and the connecting plate, can be convenient for the operator install two-way damping device between two main joists to even the cavity blade damages, also can pull down two-way damping device and use in order to be ready for subsequent new blade.

The utility model discloses further set up to: gaps are arranged between the two sides of the mass block in the width and length directions and the wall of the buffer cavity.

Through the technical scheme, the mass block has larger moving space in the buffer cavity and can move along all directions, so that the mass block can play a role in dissipating energy and reducing vibration of the hollow blade along all directions.

The utility model discloses further set up to: the hard shell layer is only coated on the peripheral walls of the two sides of the main body pipe along the length direction, the two side faces of the main body pipe along the length direction are not provided with other structures or are only provided with elastic resistance plates connected with the hard shell layer, and gaps are formed between the elastic resistance plates and the connecting plates.

Through the technical scheme, the crust layer is weaker to the spacing ability of main part pipe along main part pipe length direction's both ends, make the main part pipe can produce appropriate amount deformation at these both ends, thereby be convenient for the main part pipe carry out the energy-absorbing to the connecting plate, the elasticity hinders and has the clearance between the connecting plate, on the one hand can be appropriate amount carry on spacingly to the main part pipe, improve the energy-absorbing ability of main part pipe tip, on the other hand can not contact with the connecting plate and influence the ability conduction of connecting plate between to the main part pipe, thereby maximize the main part pipe is to the energy-absorbing effect of connecting plate, reduce hollow.

To sum up, the utility model discloses following beneficial effect has:

1. the bidirectional damping device can reduce transverse wind direction vibration of the hollow blade and downwind direction vibration of the hollow blade, thereby effectively reducing wind-induced vibration of the hollow blade and fatigue damage of a main keel of the blade and prolonging the service life;

2. the bidirectional damping device can replace the original hollow blade inner transverse support without increasing the total weight of the hollow blade basically.

Drawings

FIG. 1 is a schematic view of a prior art wind turbine blade.

Fig. 2 is a schematic structural diagram for embodying the mass block in embodiment 1.

Fig. 3 is a schematic structural diagram for embodying a cushion jacket layer in example 1.

Fig. 4 is an enlarged view of a portion a in fig. 3.

Fig. 5 is a schematic structural view of embodiment 2 for embodying the elastic resistance plate.

Reference numerals: 1. a hollow blade; 2. a main keel; 3. a main body tube; 31. a slideway; 32. a hard shell layer; 33. an elastic resistance plate; 4. a buffer chamber; 5. a mass block; 6. a connecting plate; 61. a bolt; 7. a buffer jacket layer; 8. a rubber pad; 9. a plugging plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Example 1: a bidirectional damping device for a wind driven generator blade is disclosed, as shown in figures 2 and 3, and comprises two fan blade main keels 2 arranged in a hollow blade 1, more main keels 2 can be arranged according to the size of the hollow blade 1, a main body pipe 3 made of foamed aluminum material is arranged between every two adjacent main keels 2, two slide ways 31 are arranged in the main body pipe 3 along the length direction, one side, opposite to each other, of each of the two main keels 2 is detachably connected with a connecting plate 6 through bolts 61, and each connecting plate 6 is made of steel to ensure the structural strength. One end of the connecting plate 6, which is far away from the main keel 2, is connected in the slide way 31 in a sliding manner, and is in close contact with the inside of the slide way 31, the middle part of the main body pipe 3 is provided with a buffer cavity 4, the buffer cavity 4 is communicated with the two slide ways 31, a metal mass block 5 with large density is arranged in the buffer cavity 4, and the mass block 5 is made of copper.

As shown in fig. 3 and 4, four outer circumferential surfaces of the mass block 5 along the length direction are coated with buffer jacket layers 7, the buffer jacket layers 7 are made of viscoelastic materials, in this embodiment, the viscoelastic materials are silicon rubber, the outer circumference of the buffer jacket layers 7 is fixedly connected to the cavity wall of the buffer cavity 4, and gaps are formed between each surface of the mass block 5 and the cavity wall of the buffer cavity 4. The connection part of the buffer cavity 4 and the slide way 31 is provided with a plugging plate 9, the plugging plate 9 is made of elastic material, the plugging plate 9 is fixedly connected in the buffer cavity 4 and seals the slide way 31, a rubber pad 8 is arranged between the plugging plate 9 and the mass block 5, two ends of the rubber pad 8 respectively and tightly abut against the mass block 5 and the plugging plate 9, and at the moment, the mass block 5 is positioned in the buffer cavity 4 and is not contacted with the peripheral wall of the buffer cavity 4. A gap is reserved between one end, far away from the main keel 2, of the connecting plate 6 and the blocking plate 9, so that the connecting plate 6 can slide in the slide rail 31, and even if the connecting plate 6 is too large in moving amplitude and impacts on the blocking plate 9, due to the fact that the blocking plate 9 has elasticity, the energy of impact of the connecting plate 6 can be absorbed to a large extent, and vibration of the hollow blade 1 is reduced.

As shown in fig. 3 and 4, the main body tube 3 is externally coated with a hard shell layer 32, and the hard shell layer 32 is made of hard aluminum, so that the weight of the hollow blade 1 is reduced. The hard shell layer 32 can protect the main body pipe 3 and limit the external shape of the main body pipe 3, so that the connecting plate 6 is limited in the inner part, the main body pipe 3 can be in closer contact with the connecting plate 6, and the energy generated when the connecting plate 6 vibrates can be absorbed; in addition, the internal vibration or the structural damage to the bidirectional damping device caused by the excessive vibration amplitude of the connecting plate 6 can be prevented. The hard shell layer 32 only covers the peripheral walls of the two sides of the main body pipe 3 in the length direction, and the two side faces of the main body pipe 3 in the length direction are not provided with other structures, so that the two ends of the hard shell layer 32 in the length direction of the main body pipe 3 have no limiting capacity, the main body pipe 3 can deform properly at the two ends, the main body pipe 3 can absorb energy to the connecting plate 6 conveniently, the energy absorption effect of the main body pipe 3 to the connecting plate 6 is maximized, and the vibration of the hollow blade 1 is reduced.

The working principle is as follows: when the hollow blade 1 vibrates in the transverse direction, the mass block 5 moves in the buffer cavity 4 in the direction opposite to the vibration direction due to the inertia effect, so that the gravity center of the hollow blade 1 is changed, and the vibration frequency of the hollow blade 1 is reduced; and the substructure formed by the mass 5 and the buffer jacket layer 7 is similar to a frequency-modulated mass damper, so that when the hollow blade 1 vibrates, the energy of the hollow blade 1 can be consumed.

When the hollow blade 1 vibrates in the downwind direction, the connecting plate 6 slides in the main body tube 3, and the main body tube 3 and the connecting plate 6 in the foamed aluminum structure can form a viscoelastic damper, so that part of energy generated when the hollow blade 1 vibrates can be effectively dissipated, the flutter occurrence probability is reduced, and the downwind direction vibration of the blade is reduced; and the bidirectional damping device can replace the original transverse support in the hollow blade 1, can effectively reduce the wind-induced vibration of the hollow blade 1 and the fatigue damage of the main keel 2 of the blade under the condition of basically not increasing the total weight of the hollow blade 1, and prolongs the service life.

Example 2: a bidirectional damping device for a wind turbine blade is different from embodiment 1 in that, as shown in FIG. 5, elastic resistance plates 33 connected with a hard shell 32 are arranged on both sides of a main body tube 3 in the length direction, and a gap is formed between each elastic resistance plate 33 and a connecting plate 6. At this time, a gap is formed between the elastic baffle plate 33 and the connecting plate 6, so that the main body pipe 3 can be limited in a proper amount on one hand, the energy absorption capacity of the end part of the main body pipe 3 is improved, and on the other hand, the elastic baffle plate does not contact with the connecting plate 6 to influence the capacity transmission of the connecting plate 6 to the main body pipe 3, so that the energy absorption effect of the main body pipe 3 to the connecting plate 6 is maximized, and the vibration of the hollow blade 1 is reduced.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. A two-way damping device for aerogenerator blade which characterized in that: including setting up fan blade main joist (2) two and above in cavity blade (1), adjacent two be equipped with main part pipe (3) between main joist (2), be equipped with cushion chamber (4) in main part pipe (3), be equipped with quality piece (5) in cushion chamber (4), have the clearance between the both sides of vertical direction and cushion chamber (4) chamber wall is followed in quality piece (5), adjacent two all be equipped with connecting plate (6) of connection in main part pipe (3) that slide on main joist (2).

2. The bi-directional damping device for a wind turbine blade according to claim 1, characterized in that: the damping device is characterized in that a damping sleeve layer (7) is arranged in the damping cavity (4), the damping sleeve layer (7) is made of viscoelastic materials and covers the mass block (5), and the outer wall of the damping sleeve layer (7) is connected with the cavity wall of the damping cavity (4).

3. The bi-directional damping device for a wind turbine blade according to claim 2, characterized in that: the mass block (5) is provided with rubber pads (8) towards two sides of the two main keels (2), and two ends of each rubber pad (8) respectively abut against the wall of the mass block (5) and the wall of the buffer cavity (4).

4. The bi-directional damping device for wind turbine blades according to claim 1 or 3, characterized in that: two slides (31), two have been seted up along length direction's both ends to main part pipe (3) slide (31) all communicate with cushion chamber (4), two connection board (6) slide respectively and connect in two slides (31), cushion chamber (4) are closed through closure plate (9) with the intercommunication department of slide (31), the clearance has between closure plate (9) and connection board (6).

5. The bi-directional damping device for a wind turbine blade according to claim 4, characterized in that: the blocking plate (9) is made of an elastic material.

6. The bi-directional damping device for a wind turbine blade according to claim 1, characterized in that: the main tube (3) is made of foamed aluminum material.

7. The bi-directional damping device for a wind turbine blade according to claim 6, wherein: the main body pipe (3) is coated with a hard shell layer (32).

8. The bi-directional damping device for a wind turbine blade according to claim 1, characterized in that: the connecting plate (6) is detachably connected to the main keel (2) through bolts (61).

9. The bi-directional damping device for a wind turbine blade according to claim 4, characterized in that: gaps are arranged between the two sides of the mass block (5) in the width and length directions and the wall of the buffer cavity (4).

10. The bi-directional damping device for a wind turbine blade according to claim 7, wherein: the hard shell layer (32) is only coated on the peripheral walls of the two sides of the main body pipe (3) along the length direction, the two side surfaces of the main body pipe (3) along the length direction are not provided with other structures or are only provided with an elastic resistance plate (33) connected with the hard shell layer (32), and a gap is formed between the elastic resistance plate (33) and the connecting plate (6).