CN114922786A

CN114922786A - Blade-free wind generating set based on vortex-induced vibration

Info

Publication number: CN114922786A
Application number: CN202210572510.0A
Authority: CN
Inventors: 王康世; 王坤鹏; 李勇芝
Original assignee: Shanghai Electric Wind Power Group Co Ltd
Current assignee: Shanghai Electric Wind Power Group Co Ltd
Priority date: 2022-05-24
Filing date: 2022-05-24
Publication date: 2022-08-19

Abstract

The application provides a bladeless wind generating set based on vortex-induced vibration. The generator set comprises a tower, a first tuning mass block, a generator, a swing rod and a second tuning mass block. The first tuning mass block is arranged in the tower and connected with the tower, and the height of the first tuning mass block in the tower is adjustable. The generator is arranged at the bottom of the tower barrel and comprises a stator and a rotor moving relative to the stator. The rotor is arranged in the tower, the swing rod is arranged in the tower in a swinging mode, one end of the swing rod is movably connected with the top of the tower, the other end of the swing rod is connected with the rotor, the second tuning mass block is connected with the swing rod, and the height of the second tuning mass block in the tower is adjustable. The scheme can realize the adjustment of the vibration frequency according to the wind speed, has large wind speed adaptation range and improves the utilization rate of wind energy.

Description

Blade-free wind generating set based on vortex-induced vibration

Technical Field

The application relates to the technical field of wind power generation, in particular to a bladeless wind generating set based on vortex-induced vibration.

Background

At present, a conventional horizontal axis wind generating set absorbs wind energy by means of rotation of blades, the wind is converted into mechanical energy, and the efficiency of absorbing the wind energy is determined by the blades. Particularly, the three-blade horizontal axis wind power generation has high efficiency and mature technology, and is widely applied.

In addition, a bladeless wind generating set for generating power by using a vortex-induced vibration principle exists, and the bladeless wind generating set has relatively low manufacturing cost and maintenance cost due to the fact that parts are less than those of a conventional horizontal-axis wind generating set, but the structure is not mature.

Disclosure of Invention

The application provides a no blade wind generating set based on vortex-induced vibration can realize frequency control according to the wind speed, and the adaptation wind speed scope is big, improves the utilization ratio of wind energy.

The application provides a no blade wind generating set based on vortex-induced vibration includes:

the tuning mass block is arranged in the tower and connected with the tower, and the height of the first tuning mass block in the tower is adjustable;

the generator is arranged at the bottom of the tower barrel and comprises a stator and a rotor moving relative to the stator; and

the rotor is arranged on the tower, the swing rod is arranged in the tower in a swinging mode, one end of the swing rod is movably connected with the top of the tower, the other end of the swing rod is connected with the rotor, the second tuning mass block is arranged on the swing rod, and the height of the second tuning mass block in the tower is adjustable.

Optionally, the wind generating set further includes a first lifting device disposed on the tower, and the first lifting device drives the first tuning mass block to lift along the height of the tower, so as to adjust the height of the first tuning mass block in the tower.

Optionally, the first lifting device includes a winch, the winch includes a rotatable drum and a cable, one end of the cable is connected to the drum, and the other end of the cable is connected to the first tuning mass.

Optionally, the first tuning mass is configured as a hollow structure, the pendulum rod passes through a cavity in the hollow of the first tuning mass, and the cavity in the hollow of the first tuning mass is configured to enable the second tuning mass to pass through.

Optionally, the second tuning mass is sleeved outside the swing link and is coaxially disposed with the swing link, the first tuning mass, and the tower.

Optionally, the wind generating set further includes a first locking device disposed on the tower, and the first tuning mass is locked at the adjusted height by the first locking device; and/or

The wind generating set further comprises a second locking device arranged on the swing rod, and the second tuning mass block is locked at the adjusted height through the second locking device.

Optionally, the inner wall of the tower barrel is further provided with a buffer structure, and the buffer structure isolates the tower barrel from the swing rod.

Optionally, the swing rod is movably connected with the top of the tower barrel through a universal joint.

Optionally, the generator may be movably mounted at the bottom of the tower, and moves relative to the tower along with the swing of the swing rod.

Optionally, the generator is rotatably mounted at the bottom of the tower drum, and a rotation axis of the generator is consistent with a height direction of the tower drum.

Optionally, the wind generating set further includes a second lifting device disposed on the swing rod, and the second lifting device drives the second tuning mass block to lift along the height of the tower, so as to adjust the height of the second tuning mass block in the tower.

The technical scheme provided by the application can at least achieve the following beneficial effects:

the application provides a no blade wind generating set based on vortex-induced vibration, wherein, connect in the height-adjustable of the first harmonious quality piece of a tower section of thick bamboo, connect in the height-adjustable of the second harmonious quality piece of pendulum rod, so can be according to the frequency of a wind speed regulation tower section of thick bamboo and pendulum rod, make a tower section of thick bamboo and pendulum rod can adapt to the wind speed of certain extent to produce vortex-induced resonance under corresponding wind speed, can effectively catch wind energy, improve the utilization ratio of wind energy.

Drawings

FIG. 1 is a schematic view of a bladeless wind turbine generator set according to an exemplary embodiment of the present application;

FIG. 2 is a cross-sectional view of the bladeless wind turbine shown in FIG. 1;

FIG. 3 is a cross-sectional view of a portion of the structure of the bladeless wind turbine shown in FIG. 2;

FIG. 4 is a cross-sectional view of a tower;

FIG. 5 is a longitudinal cross-sectional view of a first tuning mass;

FIG. 6 is a cross-sectional view of a pendulum and a second tuning mass shown in an exemplary embodiment of the present application;

FIG. 7 is a longitudinal cross-sectional view of a second tuning mass;

FIG. 8 is a top view of a second tuning mass;

fig. 9 is a view N-N in fig. 2.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with aspects of the present application.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. As used in this application, the terms "first," "second," and the like do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Similarly, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one, and if only "a" or "an" is denoted individually. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "back", "lower" and/or "upper", "top", "bottom", and the like are for convenience of description only and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed after "comprises" or "comprising" is inclusive of the element or item listed after "comprising" or "comprises", and the equivalent thereof, and does not exclude additional elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

Referring to fig. 1, fig. 1 is a schematic view of a bladeless wind turbine generator system 100 according to an exemplary embodiment of the present application.

The bladeless wind generating set 100 (hereinafter referred to as the generating set 100) provided by the embodiment of the application generates electricity based on the vortex-induced vibration principle, mechanical energy is captured through oscillation of a structure, and then vibration energy is converted into electric energy. The generator set 100 is not limited in application, and can be applied to both land wind farms and offshore wind farms.

The generator set 100 includes a foundation 10 and a tower 20 disposed on the foundation 10. The specific structure of the tower 20 is not limited in this application. For example, the tower 20 may be a conical tower, with the diameter of the tower 20 tapering from the bottom to the top. As another example, the tower 20 may be a cylindrical tower. In this embodiment, the tower 20 has a conical bottom and cylindrical middle and top. Foundation 10 includes, but is not limited to, a concrete foundation. The tower 20 includes, but is not limited to, a steel structural tower.

Referring to fig. 2, fig. 2 is a cross-sectional view of the generator set 100 shown in fig. 1.

The generator set 100 further comprises a pendulum 30, a first tuning mass 40, a second tuning mass 50 and a generator 60. The first tuning mass 40 is disposed in the tower 20, and is connected to the tower 20, and the height of the first tuning mass 40 in the tower 20 is adjustable. By adjusting the height of the first tuned mass 40 within the tower 20, the center of gravity of the tower 20, and thus the natural frequency of the tower 20, may be adjusted. In the embodiment shown in FIG. 2, the natural frequency of the tower 20 decreases by adjusting the first tuning mass 40 upward, and the natural frequency of the tower 20 increases by adjusting the first tuning mass 40 downward. Thus, the natural frequency of the tower 20 can be matched with the wind speed, and vortex-induced resonance is formed.

The generator 60 is disposed in the tower 20 and at the bottom of the tower 20, and the generator 60 includes a stator 61 and a rotor 62 (see fig. 9) movable relative to the stator 61. The swing rod 30 is swingably disposed in the tower 20, and the swing rod 30 can drive the mover 62 to move relative to the stator 61, so as to cut the magnetic field of the stator 61, and enable the generator 60 to generate power. Specifically, one end of the swing rod 30 is movably connected with the top of the tower 20, and the other end of the swing rod is connected with the rotor 62, so that when wind flows across the surface of the tower 20, vortex shedding is caused, and the tower 20 generates vortex-induced vibration, at this time, the swing rod 30 absorbs the vibration energy of the tower 20, and the swing rod 30 swings back and forth along with the vibration energy, so as to drive the rotor 62 of the generator 60 to move, and generate electricity. The generator 60 may be a rotary generator or a linear generator.

The second tuning mass 50 is disposed on the swing link 30, and the height of the second tuning mass 50 in the tower 20 is adjustable. The center of gravity of the pendulum rod 30 can be correspondingly adjusted by adjusting the height of the second tuning mass 50, so that the frequency of the pendulum rod 30 can be adjusted, and the frequency of the pendulum rod 30 can be adjusted within a certain range and is matched with the frequency of the tower 20. In the embodiment shown in fig. 2, the frequency of the pendulum 30 is increased by adjusting the second tuning mass 50 upwards, and the frequency of the pendulum 30 is decreased by adjusting the second tuning mass 50 downwards.

In a practical application scenario, when the generator set 100 is switched into power generation at a certain wind speed, the height of the first tuning mass block 40 needs to be adjusted to change the natural frequency of the tower 20, so that the natural frequency of the tower 20 is the same as the vortex-induced vibration frequency of the wind, thereby forming vortex-induced resonance. In addition, the height of the second tuning mass 50 needs to be adjusted to enable the swing link 30 and the tower tube 20 to form resonance, so that the swing link 30 can absorb more energy of the tower tube 20, and wind energy can be fully utilized.

According to the above description, by adjusting the height of the first tuning mass 40, the tower 20 can realize vortex-induced resonance with wind, and by adjusting the height of the second tuning mass 50, the pendulum rod 30 can also realize resonance with the tower 20, so that the effective transmission of vibration energy is realized, and the utilization rate of wind energy is improved. The generator set can realize frequency adjustment according to wind speed, and is large in applicable wind speed range.

In a practical application scenario, the first tuning mass 40 and the second tuning mass 50 may be adjusted to the same height, and at the same height, the tower 20 and the pendulum rod 30 resonate at the same frequency, which may be the same as the frequency of the vortex-induced vibration of the wind. Of course, in other practical application scenarios, the resonance of the tower 20 and the swing link 30 can also be achieved when the first tuning mass 40 and the second tuning mass 50 are not at the same height according to the difference in shape and structure between the first tuning mass 40 and the second tuning mass 50.

The present application is not limited to the specific embodiment for realizing the adjustability of the first tuning mass 40 in the height direction of the tower 20. In one embodiment, a plurality of mounting portions may be provided on the inner wall of the tower 20 at different heights, and the first tuning mass 40 may be selectively mounted to one of the mounting portions, thereby enabling adjustment of the height of the first tuning mass 40.

Referring to fig. 3, fig. 3 is a sectional view of a part of the structure of the generator set 100 shown in fig. 2.

In the embodiment shown in fig. 3, the generator set 100 further includes a first lifting device 70 disposed at the top of the tower 20, and the first lifting device 70 drives the first tuning mass 40 to lift along the height of the tower 20, so as to adjust the height of the first tuning mass 40 in the tower 20. The first lifting device 70 can realize automatic lifting of the first tuning mass 40 in the tower 20, and is simple and convenient to operate.

In one embodiment, the first lifting device 70 may comprise a winch including a rotatable drum 71 and a cable 72, one end of the cable 72 being connected to the drum 71 and the other end being connected to the first tuning mass 40. The winch occupies small space, and has simple structure and convenient operation. The winch can be provided in plurality, so that the first tuning mass 40 can be connected to a plurality of cables 72, ensuring the reliability of the connection. In this embodiment, two winches are provided. In one embodiment, the tower 20 may be configured with an equipment bay 21 at the top thereof, and a winch may be disposed within the equipment bay 21.

Referring to FIGS. 4 and 5, FIG. 4 is a schematic cross-sectional view of the tower 20. Figure 5 shows a schematic view of a longitudinal section of first tuning mass 40.

The first tuning mass block 40 may shake during the lifting process, so that the first tuning mass block 40 may be limited in order to avoid collision of the first tuning mass block 40 with the tower 20 due to the shake. In one embodiment, one of the tower 20 and the first tuning mass 40 is provided with a boss 22, and the other is provided with a groove 41, and the boss 22 and the groove 41 extend along the height direction of the tower 20 and are in sliding fit during the lifting and lowering of the first tuning mass 40. In this way, the bosses 22 and the recesses 41 can play a role in guiding and limiting the lifting of the first tuning mass 40, thereby reducing the damage to the tower 20 caused by the shaking of the first tuning mass 40.

In this embodiment the sleeve 20 is provided with a boss 22 on the inside and a recess 41 on the outside of the first tuning mass 40. In other embodiments, the inner wall of sleeve 20 may be provided with a recess 41 and the outer wall of first tuning mass 40 with a projection 22. In addition, the bosses 22 and the grooves 41 may be provided in a plurality of sets, for example, two or more sets. In this embodiment, two sets of the bosses 22 and the grooves 41 are provided, the two sets are spaced by 180 °, and the bosses 22 and the grooves 41 in each set are arranged in a one-to-one correspondence.

In one embodiment, the generator set 100 further includes a first locking device (not shown) provided at the tower 20, by which the first tuning mass 40 is locked at the adjusted height. The first locking means can ensure that the height of the first tuning mass 40 remains constant. The first locking means may comprise a plurality of retractable clamping jaws that extend and retract in a radial direction of the tower 20, and in an extended state, the plurality of clamping jaws jointly clamp the first tuning mass 40, so that the first tuning mass 40 remains fixed relative to the tower 20 at the adjusted height, and in a retracted state, the plurality of clamping jaws disengage from the first tuning mass 40. Of course, the first locking means is not limited to the above described embodiments. In other embodiments, the first locking device may further include an upper stop plate and a lower stop plate disposed along the height direction of the tower 20, the upper stop plate abutting against the upper end of the first tuning mass 40, and the lower stop plate abutting against the lower end of the first tuning mass 40, so as to clamp and fix the first tuning mass 40 at the adjusted height. The upper and lower baffles may be arranged as radially extending and retracting baffles along the tower 20 to avoid interference when adjusting the height of the first tuning mass 40.

Referring again to fig. 2, in one embodiment, the first tuning mass 40 is a hollow structure, the pendulum rod 30 passes through a hollow cavity 42 in the first tuning mass 40, and the hollow cavity 42 in the first tuning mass 40 is configured to allow the second tuning mass 50 to pass through. In this way, a clearance space is formed at the cavity 42 to avoid interference with the first tuning mass 40 when adjusting the height of the second tuning mass 50.

In one embodiment, the second tuning mass 50 is sleeved outside the swing link 30, and the second tuning mass 50 is coaxially disposed with the swing link 30, the first tuning mass 40, and the tower 20. So set up, can guarantee that the whole focus after the above-mentioned four equipment is located the central line of tower section of thick bamboo 20 direction of height, can not take place to squint in the transverse direction of perpendicular to tower section of thick bamboo 20 direction of height, can reduce tower section of thick bamboo 20's fatigue stress from this, extension tower section of thick bamboo 20's life.

Referring to fig. 6, fig. 6 is a cross-sectional view of the pendulum 30 and the second tuning mass 50 shown in fig. 2.

The present application is not limited to the specific embodiment for realizing the adjustability of the second tuning mass 50 in the height direction of the tower 20. In one embodiment, the generator set 100 further includes a second lifting device 80 disposed on the swing link 30, and the second lifting device 80 drives the second tuning mass 50 to lift along the height of the tower 20, so as to adjust the height of the second tuning mass 50 in the tower 20. The second lifting device 80 may be implemented in the same manner as the first lifting device 70, for example, the second lifting device 80 may also include a winch, which is not described in detail herein.

The top end of the swing link 30 is movably connected to the top of the tower 20 in a hinged manner. In this embodiment, the swing link 30 is connected to the top of the tower 20 through a universal joint, so that the swing link 30 can swing 360 ° relative to the tower 20, so that the swing link 30 can adapt to different wind directions.

Referring to fig. 7 and 8, fig. 7 is a schematic diagram showing a longitudinal section of the second tuning mass 50, and fig. 8 is a top view of the second tuning mass 50.

In order to avoid the second tuning mass 50 rotating relative to the swing link 30, the second tuning mass 50 may be limited along the circumference of the swing link 30. In the embodiment shown in fig. 7, the through hole 51 of the second tuning mass 50 for the swing link 30 to pass through may be configured as a non-circular hole, and the shape of the swing link 30 is the same as the shape of the through hole 51, so as to limit the rotation of the second tuning mass 50 relative to the swing link 30, and the structure is simple and easy to implement. In an alternative embodiment, the through hole 51 may be provided as a polygonal hole, an elliptical hole, etc., but is not limited thereto.

In one embodiment, the generator set 100 further comprises a second locking device (not shown) provided to the pendulum rod 30, by which the second tuning mass 50 is locked at the adjusted height. The second locking device may be configured with reference to the second locking device, and will not be described herein.

Referring to fig. 2 again, in an embodiment, a buffer structure 23 is further disposed on an inner wall of the tower 20, and the buffer structure 23 isolates the tower 20 from the swing link 30. That is to say, the buffer structure 23 can avoid the swing link 30 from colliding with the tower 20 when swinging, and avoid damaging the tower 20. The damping structure 23 may be a flexible rubber pad attached to the inner wall of the tower 20 or a spring of a deformable member. In the embodiment shown in FIG. 2, the buffer structure 23 is disposed at the junction of the cylindrical and conical sections of the tower 20.

Referring to fig. 9, fig. 9 is a sectional view of the generator 60.

In one embodiment, the generator 60 is movably mounted at the bottom of the tower 20, and moves relative to the tower 20 with the swing of the swing link 30. This prevents the generator 60 from obstructing the swinging of the swing link 30.

In a specific embodiment, the generator 60 is rotatably mounted at the bottom of the tower 20, and the rotation axis of the generator 60 is aligned with the height direction of the tower 20. Specifically, the base 10 is provided with a fixing portion 11 and a rotation support portion 12, the rotation support portion 12 is rotatably connected to the fixing portion 11, the generator 60 is mounted on the rotation support portion 12, and a rotation axis of the rotation support portion 12 is consistent with a height direction of the tower 20. When the wind direction changes, the swing link 30 moves to drive the guide member 63 and the stator 61 to rotate around the rotation axis of the rotation support portion 12 until the direction is consistent with the swing direction. The swing link 30 may be connected to the mover 62 through a shift sleeve 64. With such an arrangement, after the wind direction changes, the swing rod 30 swings in a direction which changes the direction of the guide 63 driving the stator, and the generator 60 mounted on the slewing bearing portion 12 can rotate in the direction of the guide 63 to adapt to different wind directions and swing directions. The axis of rotation of the slewing support 12 may be collinear with the centerline of the tower 20.

It should be noted that, when a shutdown is required, the tower 20 and the swing link 30 are far from resonance by adjusting the heights of the first tuning mass 40 and the second tuning mass 50, and then the swing link 30 gradually stops working, and the generator set 100 enters a shutdown state.

The generator set 100 provided by the present application may be equipped with a control system through which the generator set is automatically switched in or out to generate electricity, or shut down. For example, at a certain wind speed (when wind with different wind speeds flows over the surface of the tower 20, vortex shedding with different frequencies may occur), the control system controls the first lifting device 70 to operate according to the wind speed to adjust the height of the first tuned mass block 40, the first lifting device 70 drives the first tuned mass block 40 to move up, the frequency of the tower 20 becomes smaller, the first lifting device 70 drives the first tuned mass block 40 to move down, the frequency of the tower 20 becomes larger, and thus, the tower 20 resonates with the wind vortex. Then the control system controls the second lifting device 80 to work, the height of the second tuning mass block 50 is adjusted, the second lifting device 80 drives the second tuning mass block 50 to move upwards, the frequency of the swing rod 30 is increased, the second lifting device 80 drives the second tuning mass block 50 to move downwards, and the frequency of the swing rod 30 is decreased, so that the tower 20 and the swing rod 30 resonate, and at the moment, the swing rod 30 stably reciprocates to drive the generator 60 to continuously generate power. And adjusting the height of the second tuning mass block 50 when the system is stopped, so that the frequency of the oscillating rod 30 is far away from the vortex-induced vibration frequency until the system stops moving.

The generator set 100 provided by the embodiment of the application has the advantages that the height of the tower barrel 20 is not limited, and the generator set can be suitable for occasions with large megawatt power generation requirements.

The generator set 100 provided by the embodiment of the application adopts the linear generator 60 to be installed at the bottom of the tower tube 20, the linear generator 60 rotates at a low speed, the swing rod 30 drives the rotor 62 to move back and forth, the linear speed is high, and the generating efficiency is higher.

The generator set 100 provided by the embodiment of the application has the advantages that the structure, the material and the manufacturing process of the tower tube 20 do not need to be specially customized, the industry is mature, and the manufacturing requirements are completely met.

The generator set 100 provided by the embodiment of the application has the advantages that the number of parts is reduced, no blade or driving chain is arranged, and the equipment cost and the power generation cost are greatly reduced.

The above description is only a preferred embodiment of the present application and should not be taken as limiting the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A bladeless wind generating set based on vortex-induced vibration, comprising:

2. The bladeless wind generating set according to claim 1, further comprising a first lifting device disposed on the tower, wherein the first lifting device drives the first tuning mass to lift along a height of the tower to adjust the height of the first tuning mass within the tower.

3. The bladeless wind turbine of claim 2, wherein the first lifting device comprises a winch including a rotatable drum and a cable having one end connected to the drum and another end connected to the first tuning mass.

4. The bladeless wind turbine according to claim 1, wherein the first tuning mass is provided as a hollow structure, the pendulum rod passing through a cavity in the first tuning mass, the cavity in the first tuning mass being arranged to enable the second tuning mass to pass through.

5. The bladeless wind turbine of claim 4, wherein the second tuning mass is sleeved outside the pendulum bar and is coaxially arranged with the pendulum bar, the first tuning mass, and the tower.

6. The bladeless wind turbine generator system according to any one of claims 1-5, further comprising a first locking device provided at the tower, wherein the first tuning mass is locked at the adjusted height by the first locking device; and/or

7. The bladeless wind turbine generator system of claim 1, wherein the inner wall of the tower is further provided with a buffer structure, and the buffer structure isolates the tower from the swing rod; and/or

The swing rod is movably connected with the top of the tower barrel through a universal joint.

8. The bladeless wind turbine generator system of claim 1, wherein the generator is movably mounted to a bottom of the tower and is movable relative to the tower as the swing link swings.

9. The bladeless wind turbine generator system of claim 8, wherein the generator is rotatably mounted to a bottom of the tower, and an axis of rotation of the generator is aligned with a height of the tower.

10. The bladeless wind turbine according to any one of claims 1 to 5, further comprising a second lifting device disposed on the swing link, wherein the second lifting device drives the second tuning mass to lift along the height of the tower to adjust the height of the second tuning mass within the tower.