Marine floating type fan motion suppression structure based on liquid damping effect

Abstract

The invention discloses an offshore floating type draught fan motion restraining structure based on the liquid damping effect. The offshore floating type draught fan motion restraining structure comprises a damping disc and a vertical liquid storage barrel which are arranged on a draught fan tower barrel. The damping disc is fixedly arranged between two sections of fan tower barrels which are adjacent up and down, a crossed partition plate is arranged in the damping disc to divide the interior of the damping disc into four fan-shaped spaces with the same volume, and a damping hole is formed in the partition plate between every two adjacent fan-shaped spaces; the number of the vertical liquid storage cylinders is four, and the bottom of each vertical liquid storage cylinder communicates with one fan-shaped space in the damping disc through a communicating channel in a one-to-one correspondence mode. The damping disc and the vertical liquid storage cylinders are filled with liquid, and the liquid in the damping disc and the vertical liquid storage cylinders can flow through the damping holes, so that a liquid damping system is formed. When the floating fan shakes, the liquid damping system can play a good role in damping force.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and in particular to an offshore floating wind turbine motion suppression structure based on liquid damping. Background Art

[0002] As the development and utilization of offshore wind power resources are approaching saturation, deep sea is becoming a new direction for global offshore wind power layout. Due to the large water depth in the open sea, floating offshore wind turbines have more cost advantages than fixed wind turbines and are more feasible. They are the core technology supporting the development of deep sea wind resources. Floating wind turbines will produce large swings in 6 degrees of freedom under the influence of environmental loads such as wind, waves, and currents. First, this swing will affect the power generation efficiency of the wind turbine. Secondly, the increase in the movement of the overall structure of the floating wind turbine will significantly increase the motion load of the structure itself, affecting the safety of the overall structure of the floating wind turbine; finally, the repeated loads borne by the floating wind turbine structure and excessive movement amplitude will significantly reduce the fatigue life of the structure. Therefore, the motion suppression of floating wind turbines is an important issue related to the benefits and safety of deep sea wind power generation. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide an offshore floating wind turbine motion suppression structure based on liquid damping.

[0004] The present invention is achieved through the following technical solutions:

[0005] An offshore floating wind turbine motion suppression structure based on liquid damping, comprising a damping disc and a vertical liquid storage cylinder arranged on a wind turbine tower;

[0006] The wind turbine tower is installed in sections, and the damping disc is fixedly arranged between two adjacent sections of the wind turbine tower. The interior of the damping disc is a hollow space, and a cross partition is arranged inside the damping disc to divide the interior of the damping disc into four fan-shaped spaces of equal volume. Damping holes are arranged on the partition between two adjacent fan-shaped spaces; the number of the vertical liquid storage cylinders is four, and the bottom of each vertical liquid storage cylinder is connected to a fan-shaped space in the damping disc through a connecting channel in a one-to-one correspondence; liquid is filled in the damping disc and the vertical liquid storage cylinders, and the liquid in the damping disc and each vertical liquid storage cylinder can flow through the damping holes, thereby forming a liquid damping system.

[0007] In the above technical solution, the damping disc is in the shape of a circular disc.

[0008] In the above technical solution, the outer diameter of the damping disk is equal to the outer diameter of the wind turbine tower.

[0009] In the above technical solution, the four vertical liquid storage cylinders are evenly distributed on the outer wall of the wind turbine tower in a circular shape.

[0010] In the above technical solution, the four vertical liquid storage cylinders are evenly distributed on the inner wall of the wind turbine tower in a circular shape.

[0011] In the above technical solution, the damping holes can be in different forms such as square, circular, grid, etc.

[0012] In the above technical solution, when the damping disc is in a completely horizontal state, the height of the liquid level in the vertical liquid storage cylinder is 1 / 3 to 2 / 3 of the total height of the vertical liquid storage cylinder.

[0013] In the above technical solution, a liquid injection port is provided at the top of the vertical liquid storage cylinder, through which liquid is added to or sucked out of the damping disk and the vertical liquid storage cylinder to adjust the height of the liquid column in the vertical liquid storage cylinder.

[0014] In the above technical solution, a liquid pressure sensor is provided at the bottom of the vertical liquid storage cylinder or inside the damping disk to characterize the height of the liquid column inside the vertical liquid storage cylinder.

[0015] In the above technical solution, the frequency of the liquid damping system itself is adjusted by adjusting the height of the liquid column of the vertical liquid storage cylinder, so that the natural frequency of the liquid damping system is as close as possible to the natural frequency of the floating fan.

[0016] In the above technical solution, the parts in contact with the liquid inside the damping disc and the vertical liquid storage cylinder are subjected to anti-corrosion treatment.

[0017] The advantages and beneficial effects of the present invention are:

[0018] The offshore floating wind turbine motion suppression structure based on liquid damping of the present invention has a damping disc arranged between two adjacent wind turbine tower sections, a cross partition is arranged inside the damping disc to divide the inside of the damping disc into four fan-shaped spaces of equal volume, and a damping hole is arranged on the partition between two adjacent fan-shaped spaces; each fan-shaped space is connected to a vertical liquid storage cylinder; liquid is filled inside the damping disc and the vertical liquid storage cylinder, and the liquid inside the damping disc and each vertical liquid storage cylinder can flow through the damping hole, thereby forming a liquid damping system. When the floating wind turbine shakes, the liquid damping system of the present invention can play a good damping role. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view structural schematic diagram of an offshore floating wind turbine motion suppression structure based on liquid damping according to the first embodiment of the present invention.

[0020] Figure 2 It is a schematic diagram of the top view of the offshore floating wind turbine motion suppression structure based on liquid damping according to the first embodiment of the present invention.

[0021] Figure 3It is a front view structural schematic diagram of an offshore floating wind turbine motion suppression structure based on liquid damping according to the second embodiment of the present invention.

[0022] Figure 4 Schematic diagram of the top view of the offshore floating wind turbine motion suppression structure based on liquid damping according to the second embodiment of the present invention (i.e. Figure 3 A-direction cross-sectional view).

[0023] Figure 5 It is a schematic diagram of the mechanism of action of working condition 1 of the present invention.

[0024] Figure 6 It is a schematic diagram of the mechanism of action of working condition 2 of the present invention.

[0025] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is further described below in conjunction with specific embodiments.

[0027] Embodiment 1

[0028] See attached Figure 1 -Attached Figure 2 A liquid damping-based offshore floating wind turbine motion suppression structure comprises a damping disc 1 and a vertical liquid storage cylinder 2 arranged on a wind turbine tower.

[0029] The wind turbine tower is installed in sections, and the damping disc 1 is fixedly arranged between two upper and lower adjacent sections of the wind turbine tower 10. The damping disc 1 is in the shape of a disc, and preferably, its outer diameter is equal to the outer diameter of the wind turbine tower; the interior of the damping disc 1 is a hollow space, and a cross partition 11 is arranged inside it to divide the interior of the damping disc 4 into four fan-shaped spaces of equal volume, and a damping hole 12 is arranged on the partition 11 between two adjacent fan-shaped spaces (the damping hole 12 is a through hole, which can enable the liquid in each fan-shaped space to have a certain mutual flowability, and at the same time, because the through hole is smaller than the area of ​​the partition, it will form resistance to the water flow, that is, it plays a damping role).

[0030] There are four vertical liquid storage cylinders 2, which are evenly distributed on the outer wall of the wind turbine tower in a circular shape, and each vertical liquid storage cylinder 2 is arranged vertically; the bottom of each vertical liquid storage cylinder 2 is connected to a fan-shaped space in the damping disk 1 through a connecting channel 3 (that is, four mounting through holes are evenly distributed on the outer wall of the damping disk 4, and each mounting through hole is connected to a fan-shaped space inside the damping disk 4; and each vertical liquid storage cylinder 2 is provided with a mounting hole at the bottom, and the mounting hole of the vertical liquid storage cylinder 2 is connected to the mounting through hole on the damping disk 4, thereby forming a connecting channel 3, so that the bottom of each vertical liquid storage cylinder 2 is connected to a fan-shaped space in the damping disk 1 through the connecting channel 3). Further, the damping hole 12 can be in different forms such as square, circular, and grid-like.

[0031] Liquid is filled inside the damping disc 1 and the vertical liquid storage tube 2. The vertical liquid storage tube 2 is not full of liquid, and sufficient non-liquid space is reserved at the top, so that during the floating vibration of the wind turbine at sea, the liquid inside the damping disc 1 and each vertical liquid storage tube 2 can flow through the damping holes 12, thereby forming a liquid damping system. Preferably, when the damping disc 1 of the present invention is in a completely horizontal state, the height of the liquid level 4 of the liquid in the vertical liquid storage tube 2 is 1 / 3 to 2 / 3 of the total height of the vertical liquid storage tube 2.

[0032] Furthermore, a liquid filling port (not shown in the figure) is provided at the top of the vertical liquid storage cylinder 2, through which liquid can be added to or sucked out of the damping disk 1 and the vertical liquid storage cylinder 2, thereby adjusting the height of the liquid column in the vertical liquid storage cylinder 2.

[0033] Furthermore, preferably, when the natural frequency of the liquid damping system is the same as the natural frequency of the floating fan, the damping effect is best. The main parameters of the liquid damping system include the size of the damping disk, the height of the liquid column of the vertical liquid storage cylinder, and the size of the damping hole. Preferably, the frequency of the liquid damping system itself is adjusted by adjusting the height of the liquid column of the vertical liquid storage cylinder: a liquid pressure sensor is provided at the bottom of the vertical liquid storage cylinder or inside the damping disk to characterize the height of the liquid column, so that the height of the liquid column can be adjusted according to actual needs (the liquid column height can be adjusted by adding liquid or sucking out liquid through the liquid injection port at the top of the vertical liquid storage cylinder 2), so that the natural frequency of the liquid damping system is as close as possible to the natural frequency of the floating fan.

[0034] Furthermore, the surfaces of the components related to the liquid damping system, such as the damping disc 1, the vertical liquid storage cylinder 2, the liquid pressure sensor, the partition, the liquid injection port, etc., should be coated with an anti-corrosion layer.

[0035] Embodiment 2

[0036] See attached Figure 3 -Attached Figure 4A liquid damping-based offshore floating wind turbine motion suppression structure comprises a damping disc 1 and a vertical liquid storage cylinder 2 arranged on a wind turbine tower.

[0037] The difference between this embodiment and the first embodiment is that the four vertical liquid storage cylinders 2 are evenly distributed on the inner wall of the wind turbine tower in a circular shape, and the bottom of each vertical liquid storage cylinder 2 is connected to a fan-shaped space in the damping disk 1 through a connecting channel 3 in a one-to-one correspondence (that is, four mounting through holes are evenly distributed on the top surface of the damping disk 4, and each mounting through hole corresponds to a fan-shaped space inside the damping disk 4; and the bottom of each vertical liquid storage cylinder 2 is respectively provided with a mounting hole, and the mounting hole of the vertical liquid storage cylinder 2 is connected to the mounting through hole on the damping disk 4, thereby forming a connecting channel 3, so that the bottom of each vertical liquid storage cylinder 2 is connected to a fan-shaped space in the damping disk 1 through the connecting channel 3 in a one-to-one correspondence).

[0038] The working mechanism of the offshore floating wind turbine motion suppression structure based on liquid damping of the present invention is as follows:

[0039] 1. Mechanism of suppressing the shaking and swaying of floating wind turbines

[0040] The floating wind turbine will produce large shaking (rolling, pitching) and swaying (swaying, swaying) in the plane where the main wind direction is located. When the main wind direction and the minimum angle α (0<=α<=45) between the partition of the offshore floating wind turbine motion suppression structure of the present invention are different, the flow direction of the liquid in the damping disk is different.

[0041] Working condition 1: Working condition 1 is a special case. Figure 5 When the main wind direction and the minimum angle between the partition are small (such as 0 <= α < 10°), the damping holes k2 and k3 mainly play a damping role. During the shaking or swaying of the floating fan, most of the liquid consumes energy through the damping holes k2 and k3 to play a damping effect.

[0042] Working condition 2: Working condition 2 is a general condition. Figure 6 When the main wind direction and the minimum angle between the partition are large (10°<α<=45°), all four damping holes can have strong adaptability to shaking and swaying in different directions, and have good suppression effect. At this time, the liquid mainly flows back and forth between the liquid column C1 and the liquid column C3, and needs to pass through the damping holes k1 and k2, as well as the damping holes k3 and k4, which can increase the damping force and thus improve the motion suppression effect.

[0043] 2. Mechanism of suppressing bow swing of floating wind turbines

[0044] The significant feature of the offshore floating wind turbine motion suppression structure of the present invention is that it can effectively suppress the bowing motion of the floating wind turbine. Since the wind force distribution is uneven, the floating wind turbine is likely to produce bowing motion; when the floating wind turbine produces bowing motion, the liquid inside the present invention will generate a circulation in the opposite direction of the floating wind turbine rotation, and generate a damping force in the process of passing through the damping hole, thereby suppressing the bowing motion of the floating wind turbine.

[0045] The present invention is described above by way of example. It should be noted that, without departing from the core of the present invention, any simple deformation, modification or other equivalent replacement that can be made by those skilled in the art without inventive effort falls within the protection scope of the present invention.

Claims

1. An offshore floating wind turbine motion suppression structure based on liquid damping, characterized in that: It includes a damping disc and a vertical liquid storage cylinder arranged on the wind turbine tower; The wind turbine tower is installed in sections, and the damping disc is fixedly arranged between two adjacent sections of the wind turbine tower. The interior of the damping disc is a hollow space, and a cross partition is arranged inside the damping disc to divide the interior of the damping disc into four fan-shaped spaces of equal volume. Damping holes are arranged on the partition between two adjacent fan-shaped spaces; the number of the vertical liquid storage cylinders is four, and the bottom of each vertical liquid storage cylinder is connected to a fan-shaped space in the damping disc through a connecting channel in a one-to-one correspondence; liquid is filled in the damping disc and the vertical liquid storage cylinders, and the liquid in the damping disc and each vertical liquid storage cylinder can flow through the damping holes, thereby forming a liquid damping system.

2. The offshore floating wind turbine motion suppression structure based on liquid damping according to claim 1 is characterized in that: The damping disc is in the shape of a disc.

3. The offshore floating wind turbine motion suppression structure based on liquid damping according to claim 1 is characterized in that: The outer diameter of the damping disc is equal to the outer diameter of the wind turbine tower.

4. The offshore floating wind turbine motion suppression structure based on liquid damping according to claim 1 is characterized in that: The four vertical liquid storage cylinders are evenly distributed on the outer wall of the fan tower in a circular shape.

5. The offshore floating wind turbine motion suppression structure based on liquid damping according to claim 1 is characterized in that: The four vertical liquid storage cylinders are evenly distributed on the inner wall of the fan tower in a circular shape.

6. The offshore floating wind turbine motion suppression structure based on liquid damping according to claim 1 is characterized in that: The damping holes are in different forms such as square, circular or grid.

7. The offshore floating wind turbine motion suppression structure based on liquid damping according to claim 1 is characterized in that: When the damping disc is in a completely horizontal state, the height of the liquid level in the vertical liquid storage cylinder is 1 / 3 to 2 / 3 of the total height of the vertical liquid storage cylinder.

8. The offshore floating wind turbine motion suppression structure based on liquid damping according to claim 1 is characterized in that: A liquid injection port is arranged at the top of the vertical liquid storage cylinder, through which liquid is added to or sucked out of the damping disc and the vertical liquid storage cylinder to adjust the height of the liquid column in the vertical liquid storage cylinder.

9. The offshore floating wind turbine motion suppression structure based on liquid damping according to claim 8 is characterized in that: A liquid pressure sensor is provided at the bottom of the vertical liquid storage cylinder or inside the damping disk to characterize the height of the liquid column inside the vertical liquid storage cylinder.

10. The offshore floating wind turbine motion suppression structure based on liquid damping according to claim 9 is characterized in that: The frequency of the liquid damping system itself is adjusted by adjusting the height of the liquid column of the vertical liquid storage cylinder, so that the natural frequency of the liquid damping system is the same as the natural frequency of the floating fan.

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