Damping device for a wind turbine and wind turbine
By installing damping and buffering mechanisms inside the wind turbine tower, and utilizing the rotation of the damping ring and the expansion and contraction of the buffer to absorb energy, the structural safety problem caused by tower vibration is solved, and the stress at the bottom of the tower is reduced and the service life is extended.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JINENG TONGYU GREEN ELECTRIC CO LTD
- Filing Date
- 2025-07-25
- Publication Date
- 2026-07-14
AI Technical Summary
The towers of existing wind turbine generators lack effective vibration damping protection, which causes mechanical vibration, rotor aerodynamic loads, and impact loads caused by sudden changes in wind direction to act directly on the bottom of the tower, affecting structural safety and shortening service life.
A damping mechanism and an external buffer mechanism are installed inside the tower. The damping mechanism consists of first and second damping rings, which are filled with damping fluids of different viscosities. Shear energy is dissipated by the relative rotation of the damping rings. The external buffer mechanism absorbs horizontal kinetic energy through a buffer sleeve and a buffer, and absorbs vertical kinetic energy in combination with a vertical buffer structure, forming a multi-stage energy dissipation mechanism.
It effectively reduces stress concentration at the bottom of the tower, improves structural safety and extends service life. Through the shear flow of the damping fluid and the expansion and contraction of the buffer, it significantly reduces vibration energy and prevents loosening and fatigue damage.
Smart Images
Figure CN224497250U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wind power generation technology, and in particular to a vibration damping device for a wind turbine generator set and a wind turbine generator set. Background Technology
[0002] Existing wind turbine towers are typically rigidly fixed to concrete foundations using flanges or anchor bolts, leaving the tower base without effective vibration damping. During long-term operation, mechanical vibrations, rotor aerodynamic loads, and impact loads caused by sudden changes in wind direction directly act on the tower base, leading to tower loosening. This affects the structural safety of the wind turbine and its service life. Utility Model Content
[0003] The main purpose of this utility model is to propose a vibration damping device and a wind turbine generator set, aiming to solve the technical problem that the structural safety and service life of wind turbine generator sets are easily affected by vibration or external loads.
[0004] To achieve the above objectives, this utility model proposes a vibration damping device for a wind turbine generator set. The vibration damping device is installed on the tower of the wind turbine generator set and includes:
[0005] A damping mechanism is disposed inside the tower. The damping mechanism includes a first damping ring and a second damping ring. The first damping ring is installed on the inner wall of the tower and coaxially sleeved on the outer periphery of the second damping ring. The second damping ring can rotate axially around the first damping ring. A first damping cavity is formed circumferentially inside the first damping ring and filled with a first damping fluid. A second damping cavity is formed circumferentially inside the second damping ring and filled with a second damping fluid. Both the first damping cavity and the second damping cavity are annular closed cavities.
[0006] A buffering mechanism is provided, comprising a horizontal buffering structure, which includes a buffer sleeve and a plurality of first buffers. The buffer sleeve is fitted around the outer periphery of the tower, and the plurality of first buffers are arranged around the buffer sleeve. One end of each first buffer is connected to the buffer sleeve, and the other end of each first buffer is fixed to the outside.
[0007] In one embodiment, the inner wall of the first damping ring is recessed outward to form a mounting groove, the mounting groove is arranged along the circumference of the first damping ring, the mounting groove is disposed to avoid the first damping cavity, the second damping ring is mounted in the mounting groove, and the second damping ring can rotate axially relative to the first damping ring.
[0008] In one embodiment, a rolling assembly is provided on the bottom wall of the mounting groove, and the bottom of the second damping ring is supported on the rolling assembly and rolls in cooperation with the rolling assembly.
[0009] In one embodiment, the rolling assembly includes a plurality of rollers, which are spaced apart circumferentially along the mounting groove. The bottom wall of the mounting groove is recessed downward to form a plurality of receiving grooves. The number of receiving grooves is the same as the number of rollers and they are arranged in a one-to-one correspondence. The opening of each receiving groove faces upward, and each roller is mounted in its corresponding receiving groove via a rotating shaft. A portion of each roller extends out of the opening and is supported on the bottom of the second damping ring, and rolls in cooperation with the second damping ring.
[0010] In one embodiment, the viscosity of the first damping fluid is greater than the viscosity of the second damping fluid.
[0011] In one embodiment, both the first damping fluid and the second damping fluid are dimethyl silicone oil.
[0012] In one embodiment, the first damping ring is provided with a first injection port communicating with the first damping cavity, and the first damping ring is covered with a removable first sealing cap at the position corresponding to the first injection port; the second damping ring is provided with a second injection port communicating with the second damping cavity, and the second damping ring is covered with a removable second sealing cap at the position corresponding to the second injection port.
[0013] In one embodiment, the buffer mechanism further includes a vertical buffer structure disposed inside the tower. The vertical buffer structure includes a buffer platform and a second buffer. The buffer platform is installed on top of the second buffer, and the bottom of the second buffer is fixedly connected to the outside. The inner wall of the tower protrudes inward to form a support ear, which is supported on the top of the buffer platform.
[0014] In one embodiment, the damping mechanism is disposed near the top of the tower, and both the horizontal buffer structure and the vertical buffer structure are disposed near the bottom of the tower.
[0015] This utility model also proposes a wind turbine generator set, which includes a tower and the aforementioned vibration damping device for the wind turbine generator set.
[0016] The technical solution of this utility model employs a damping mechanism installed inside the tower. This damping mechanism includes a first damping ring and a second damping ring. The first damping ring is installed on the inner wall of the tower, and the second damping ring is coaxially sleeved inside the first damping ring and can rotate relative to it axially. A first damping cavity extending circumferentially is formed in the first damping ring and filled with a first damping fluid, and a second damping cavity extending circumferentially is formed in the second damping ring and filled with a second damping fluid. Simultaneously, a buffer mechanism is installed outside the tower. This buffer mechanism includes a horizontal buffer structure, which consists of a buffer sleeve sleeved around the outer periphery of the tower and a surrounding buffer sleeve. The system consists of multiple first dampers, each connected at one end to a buffer sleeve and fixed to the outside at the other end, specifically on the foundation of the tower. Thus, when the tower is subjected to vibration or external load, the first damping fluid in the first damping cavity and the second damping fluid in the second damping cavity generate shear energy dissipation due to the rotation of the second damping ring relative to the first damping ring. The horizontal buffer structure further absorbs horizontal kinetic energy through the expansion and contraction of the first dampers, thereby effectively reducing stress concentration at the bottom of the tower, improving the structural safety of the wind turbine generator and extending its service life.
[0017] Furthermore, the second damping ring can rotate axially relative to the first damping ring, so that when the tower is subjected to torsional or bending vibrations, the first damping ring moves synchronously with the tower, while the second damping ring rotates with hysteresis due to inertia, forming a controllable relative angular displacement between the first and second damping rings. This relative rotation causes shear flow in the first damping fluid filled in the first damping ring and the second damping fluid filled in the second damping ring, converting the vibration energy into internal frictional heat of the first and second damping fluids and dissipating it rapidly. This significantly reduces the peak torsional and bending stress at the bottom of the tower, avoids the rigid transmission of vibration to the foundation, and further improves the structural safety and service life of the wind turbine generator. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0019] Figure 1 A schematic diagram of a structure of an embodiment of the vibration damping device for a wind turbine generator set provided by this utility model;
[0020] Figure 2 A perspective view of an embodiment of the vibration damping device for a wind turbine generator set provided by this utility model;
[0021] Figure 3A schematic diagram of the damping mechanism in one embodiment of the shock absorption device for a wind turbine generator set provided by this utility model;
[0022] Figure 4 A cross-sectional schematic diagram of the damping mechanism in one embodiment of the shock absorption device for the wind turbine generator set provided by this utility model;
[0023] Figure 5 A schematic diagram of the structure of the first damping ring in one embodiment of the vibration reduction device for the wind turbine generator set provided by this utility model;
[0024] Figure 6 A schematic diagram of the vertical buffer structure in one embodiment of the shock absorption device for the wind turbine generator set provided by this utility model.
[0025] Explanation of icon numbers:
[0026] 10. Damping mechanism; 11. First damping ring; 111. First damping cavity; 112. Mounting groove; 113. Receiving groove; 114. First injection port; 115. First sealing cap; 12. Second damping ring; 121. Second damping cavity; 122. Second injection port; 123. Second sealing cap; 13. Rolling assembly; 131. Roller; 20. Buffer mechanism; 21. Horizontal buffer structure; 211. Buffer sleeve; 212. First buffer; 22. Vertical buffer structure; 221. Buffer platform; 222. Second buffer; 30. Tower; 31. Support lug.
[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.
[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0031] This utility model proposes a vibration reduction device for wind turbine generator sets.
[0032] Please see Figures 1 to 5 In one embodiment of this utility model, the vibration damping device of the wind turbine generator set is installed on the tower of the wind turbine generator set. The vibration damping device includes a damping mechanism and a buffer mechanism. The damping mechanism is installed inside the tower and includes a first damping ring and a second damping ring. The first damping ring is installed on the inner wall of the tower and is coaxially sleeved on the outer periphery of the second damping ring. The second damping ring can rotate axially around the first damping ring. A first damping cavity is formed in the first damping ring along its circumference and is filled with a first damping fluid. A second damping cavity is formed in the second damping ring along its circumference and is filled with a second damping fluid. Both the first damping cavity and the second damping cavity are annular closed cavities. The buffer mechanism includes a horizontal buffer structure, which includes a buffer sleeve and a plurality of first buffers. The buffer sleeve is sleeved on the outer periphery of the tower and the plurality of first buffers are arranged around the outside of the buffer sleeve. One end of each first buffer is connected to the buffer sleeve, and the other end of each first buffer is fixed to the outside.
[0033] The technical solution of this utility model employs a damping mechanism installed inside the tower. This damping mechanism includes a first damping ring and a second damping ring. The first damping ring is installed on the inner wall of the tower, and the second damping ring is coaxially sleeved inside the first damping ring and can rotate relative to it axially. A first damping cavity extending circumferentially is formed in the first damping ring and filled with a first damping fluid, and a second damping cavity extending circumferentially is formed in the second damping ring and filled with a second damping fluid. Simultaneously, a buffer mechanism is installed outside the tower. This buffer mechanism includes a horizontal buffer structure, which consists of a buffer sleeve sleeved around the outer periphery of the tower and a surrounding buffer sleeve. The system consists of multiple first dampers, each connected at one end to a buffer sleeve and fixed to the outside at the other end, specifically on the foundation of the tower. Thus, when the tower is subjected to vibration or external load, the first damping fluid in the first damping cavity and the second damping fluid in the second damping cavity generate shear energy dissipation due to the rotation of the second damping ring relative to the first damping ring. The horizontal buffer structure further absorbs horizontal kinetic energy through the expansion and contraction of the first dampers, thereby effectively reducing stress concentration at the bottom of the tower, improving the structural safety of the wind turbine generator and extending its service life.
[0034] Furthermore, the second damping ring can rotate axially relative to the first damping ring, so that when the tower is subjected to torsional or bending vibrations, the first damping ring moves synchronously with the tower, while the second damping ring rotates with hysteresis due to inertia, forming a controllable relative angular displacement between the first and second damping rings. This relative rotation causes shear flow in the first damping fluid filled in the first damping ring and the second damping fluid filled in the second damping ring, converting the vibration energy into internal frictional heat of the first and second damping fluids and dissipating it rapidly. This significantly reduces the peak torsional and bending stress at the bottom of the tower, avoids the rigid transmission of vibration to the foundation, and further improves the structural safety and service life of the wind turbine generator.
[0035] In one embodiment of the present invention, the inner wall of the first damping ring is recessed outward to form a mounting groove, the mounting groove is arranged along the circumference of the first damping ring, the mounting groove is disposed in a way that avoids the first damping cavity, the second damping ring is mounted in the mounting groove, and the second damping ring can rotate axially around the first damping ring relative to it.
[0036] Specifically, such as Figures 3 to 5As shown, by setting a circumferentially recessed mounting groove on the inner wall of the first damping ring, the second damping ring is completely embedded in the mounting groove and radially constrained, retaining only the rotational degree of freedom around the axial direction. This ensures that the second damping ring can rotate smoothly within the groove while preventing radial movement or dislodgement. The second damping ring can be easily and rotatably installed on top of the first damping ring. When the tower experiences torsional or bending vibrations, the first damping ring moves synchronously with the tower. Due to inertia, the second damping ring rotates relative to the first damping ring within the mounting groove. The second damping fluid within the second damping ring rapidly dissipates energy during its rotation, converting vibrational energy into heat energy for dissipation. This significantly reduces torsional and bending stress at the bottom of the tower, preventing loosening or fatigue failure. Furthermore, the mounting groove structure is simple, positioning is reliable, and assembly and maintenance are convenient.
[0037] In one embodiment of the present invention, a rolling assembly is provided on the bottom wall of the mounting groove, and the bottom of the second damping ring is supported on the rolling assembly and rolls in cooperation with the rolling assembly.
[0038] Specifically, such as Figure 4 and Figure 5 As shown, by uniformly arranging several rolling components along the circumference of the bottom wall of the mounting groove, the bottom of the second damping ring is directly supported on the rolling components, changing the sliding contact between the second and first damping rings into a rolling fit. When the tower is subjected to torsional or bending vibrations, the first damping ring undergoes angular displacement with the tower, while the second damping ring lags behind due to inertia. The rolling components provide low-friction, low-wear rolling support between the two rings, enabling the second damping ring to rotate smoothly and continuously relative to the first damping ring. During the relative rotation, the second damping fluid generates stable high-gradient shear, allowing vibration energy to be efficiently dissipated. The rolling components significantly reduce inter-ring frictional resistance and wear, preventing damping performance degradation due to increased friction after long-term operation. This ensures that the vibration damping device maintains stable energy dissipation capacity throughout its entire life cycle, further extending the service life of the tower and wind turbine generator.
[0039] In one embodiment of the present invention, the rolling assembly includes multiple rollers, which are spaced apart circumferentially along the mounting groove. The bottom wall of the mounting groove is recessed downward to form multiple receiving grooves. The number of receiving grooves and rollers are the same and they are arranged in a one-to-one correspondence. The opening of each receiving groove faces upward, and each roller is mounted in its corresponding receiving groove through a rotating shaft. Part of each roller extends out of the groove and is supported on the bottom of the second damping ring, and rolls in cooperation with the second damping ring.
[0040] Furthermore, by employing a method of evenly distributing several receiving slots around the bottom wall of the mounting groove, with rollers installed in each receiving slot via a rotating shaft, the rollers extend out of the slot and form rolling support with the bottom of the second damping ring. When the tower is subjected to torsional or bending vibrations, the first damping ring rotates with the tower, while the second damping ring lags behind due to inertia. The rollers roll around the rotating shaft within the receiving slots, transforming the original sliding friction between the rings into rolling friction, significantly reducing the coefficient of friction and ensuring that the rotation of the second damping ring relative to the first damping ring is always smooth, low-resistance, and low-noise. At the same time, the rollers correspond one-to-one with the receiving slots, ensuring precise positioning, avoiding eccentric wear, extending the service life of the wind turbine generator, and featuring a simple structure that is convenient for assembly and maintenance.
[0041] In one embodiment of this utility model, the viscosity of the first damping fluid is greater than the viscosity of the second damping fluid.
[0042] Specifically, the viscosity of the first damping fluid is higher than that of the second damping fluid. This means that when the tower experiences torsional or bending vibrations, the first damping fluid in the first damping ring provides higher shear resistance due to its higher viscosity, rapidly dissipating high-frequency, small-amplitude torsional energy. Conversely, the second damping fluid in the second damping ring, with its lower viscosity, reduces the hysteretic rotational resistance of the second damping ring, allowing for a relatively large angular displacement, thus continuing to effectively dissipate energy during low-frequency, large-amplitude vibrations. The different viscosities of the first and second damping fluids create a gradient energy dissipation mechanism. The first damping fluid first suppresses high-frequency vibration peaks, while the second damping fluid absorbs the remaining energy. This results in a more stable and continuous overall vibration reduction effect, significantly reducing stress concentration at the bottom of the tower and further improving the structural safety and service life of the wind turbine generator.
[0043] In one embodiment of this utility model, both the first damping fluid and the second damping fluid are dimethyl silicone oil.
[0044] Specifically, by using dimethyl silicone oil as both the first and second damping fluid, its advantages of stable viscosity-temperature characteristics, strong chemical inertness, and resistance to volatility and oxidation are utilized. It can extend the service life of wind turbine generators by preventing precipitation and corrosion during long-term operation.
[0045] In one embodiment of the present invention, a first damping ring is provided with a first injection port communicating with a first damping cavity, and a removable first sealing cap is provided on the first damping ring at the position corresponding to the first injection port; a second damping ring is provided with a second injection port communicating with a second damping cavity, and a removable second sealing cap is provided on the second damping ring at the position corresponding to the second injection port.
[0046] Specifically, such as Figure 3As shown, a first injection port communicating with the first damping cavity is opened on the outer periphery of the first damping ring and sealed with a removable first sealing cap; simultaneously, a second injection port communicating with the second damping cavity is opened on the outer periphery of the second damping ring and sealed with a removable second sealing cap. During on-site installation or subsequent maintenance, either the first or second sealing cap can be opened individually to replenish or replace the corresponding first damping fluid in the first damping cavity or the second damping fluid in the second damping cavity, making the process simple and convenient.
[0047] Furthermore, the positions of the first sealing cap and the first damping ring corresponding to the first injection port, and the positions of the second sealing cap and the second damping ring corresponding to the second injection port, can be fitted with threads or snaps, allowing for quick disassembly and assembly and reliable sealing.
[0048] In one embodiment of the present invention, the buffer mechanism further includes a vertical buffer structure, which is disposed inside the tower. The vertical buffer mechanism includes a buffer platform and a second buffer. The buffer platform is installed on the top of the second buffer, and the bottom of the second buffer is connected and fixed to the outside. The inner wall of the tower protrudes inward to form a support ear, which is supported on the top of the buffer platform.
[0049] Specifically, such as Figure 6 As shown, a vertical buffer structure is added inside the tower. This vertical buffer structure consists of a buffer platform and a second buffer. The bottom of the second buffer is fixed to the outside, and its top supports the buffer platform. Support ears protruding inwards from the inner wall of the tower directly press against the top surface of the buffer platform, allowing the weight of the tower and vertical vibrations to be transmitted through the support ears to the buffer platform, and then from the buffer platform to the second buffer. When the tower is subjected to vertical impact or axial vibrations caused by the start-up and shutdown of the unit, the second buffer is compressed or rebounds, absorbing and dissipating vertical kinetic energy. The support ears and the buffer platform form a separable support, ensuring smooth transmission of vertical force while allowing the tower to sway slightly in the horizontal direction without affecting the vertical vibration reduction function. Thus, the horizontal and vertical buffer structures work together to achieve multi-stage energy dissipation of the tower, further improving structural safety and service life.
[0050] In one embodiment of this utility model, the damping mechanism is disposed near the top of the tower, and both the horizontal buffer structure and the vertical buffer structure are disposed near the bottom of the tower.
[0051] Specifically, the damping mechanism is installed at the top of the tower, while the horizontal and vertical buffer structures are arranged together at the bottom of the tower; these three components form a two-stage energy absorption layout along the longitudinal direction of the tower. When vibration is transmitted from the top to the bottom, the energy of the impact and vibration is first absorbed by the damping mechanism, and then the remaining energy is absorbed by the horizontal and vertical buffer structures at the bottom. The energy attenuates gradually along the tower, resulting in better absorption of impact and vibration energy. This can more effectively improve the structural safety of the wind turbine generator and extend its service life.
[0052] This utility model also proposes a wind turbine generator set, which includes a tower and a vibration damping device for the wind turbine generator set. The specific structure of the vibration damping device for the wind turbine generator set is as described in the above embodiments. Since this second subject adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0053] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the protection scope of the present utility model.
Claims
1. A vibration damping device for a wind turbine generator set, characterized in that, The vibration damping device is installed on the tower of the wind turbine generator set, and the vibration damping device includes: A damping mechanism is disposed inside the tower. The damping mechanism includes a first damping ring and a second damping ring. The first damping ring is installed on the inner wall of the tower and coaxially sleeved on the outer periphery of the second damping ring. The second damping ring can rotate axially around the first damping ring. A first damping cavity is formed circumferentially inside the first damping ring and filled with a first damping fluid. A second damping cavity is formed circumferentially inside the second damping ring and filled with a second damping fluid. Both the first damping cavity and the second damping cavity are annular closed cavities. A buffering mechanism is provided, comprising a horizontal buffering structure, which includes a buffer sleeve and a plurality of first buffers. The buffer sleeve is fitted around the outer periphery of the tower, and the plurality of first buffers are arranged around the buffer sleeve. One end of each first buffer is connected to the buffer sleeve, and the other end of each first buffer is fixed to the outside.
2. The vibration damping device for a wind turbine generator set as described in claim 1, characterized in that, The inner wall of the first damping ring is recessed outward to form a mounting groove, which is arranged along the circumference of the first damping ring and is disposed to avoid the first damping cavity. The second damping ring is mounted in the mounting groove and can rotate axially relative to the first damping ring.
3. The vibration damping device for a wind turbine generator set as described in claim 2, characterized in that, A rolling assembly is provided on the bottom wall of the mounting groove, and the bottom of the second damping ring is supported by the rolling assembly and rolls in cooperation with the rolling assembly.
4. The vibration damping device for a wind turbine generator set as described in claim 3, characterized in that, The rolling assembly includes multiple rollers, which are spaced apart circumferentially along the mounting groove. The bottom wall of the mounting groove is recessed downward to form multiple receiving grooves. The number of receiving grooves is the same as the number of rollers and they are arranged in a one-to-one correspondence. The opening of each receiving groove faces upward, and each roller is mounted in its corresponding receiving groove via a rotating shaft. A portion of each roller extends out of the groove and is supported on the bottom of the second damping ring, and rolls in cooperation with the second damping ring.
5. The vibration damping device for a wind turbine generator set as described in claim 1, characterized in that, The viscosity of the first damping fluid is greater than that of the second damping fluid.
6. The vibration damping device for a wind turbine generator set as described in claim 1, characterized in that, Both the first damping fluid and the second damping fluid are dimethyl silicone oil.
7. The vibration damping device for a wind turbine generator set as described in any one of claims 1 to 6, characterized in that, The first damping ring is provided with a first injection port communicating with the first damping cavity, and the first damping ring is covered with a detachable first sealing cap at the position corresponding to the first injection port; the second damping ring is provided with a second injection port communicating with the second damping cavity, and the second damping ring is covered with a detachable second sealing cap at the position corresponding to the second injection port.
8. The vibration damping device for a wind turbine generator set as described in any one of claims 1 to 6, characterized in that, The buffer mechanism further includes a vertical buffer structure, which is disposed inside the tower. The vertical buffer structure includes a buffer platform and a second buffer. The buffer platform is installed on top of the second buffer, and the bottom of the second buffer is fixedly connected to the outside. The inner wall of the tower protrudes inward to form a support ear, which is supported on the top of the buffer platform.
9. The vibration damping device for a wind turbine generator set as described in claim 8, characterized in that, The damping mechanism is located near the top of the tower, and both the horizontal buffer structure and the vertical buffer structure are located near the bottom of the tower.
10. A wind turbine generator set, characterized in that, The wind turbine generator set includes a tower and a vibration damping device for the wind turbine generator set as described in any one of claims 1 to 9.