A damper spring shock absorber for a fan

Abstract

The utility model discloses a damper spring shock absorber for fan, including base, the top center of base is installed with spring subassembly, the top of spring subassembly is installed with top seat, and the protection bushing is installed between base and top seat, and the protection bushing includes the fixed bushing of installation on base, and the movable bushing is slidably installed in fixed bushing, and the movable bushing is installed at the bottom of top seat, and the fixed bushing and movable bushing form the damping liquid cavity between, and the damping liquid is filled in the damping liquid cavity, and spring subassembly sets up in the damping liquid cavity, and spring subassembly includes the spring fixed seat of installation on base and installation at the bottom of top seat, and the first spring, second spring and third spring are installed between pad and spring fixed seat, and the first spring, second spring and third spring are concentrically nested from inside to outside.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine vibration reduction technology, specifically relating to a damping spring vibration damper for wind turbines. Background Technology

[0002] With the continuous growth of global demand for clean energy, the wind power industry has developed rapidly, especially in my country, which possesses abundant offshore wind energy resources and has enormous potential for offshore wind power development. However, wind turbine towers face numerous challenges during operation. The operating environment of offshore wind turbine towers is complex, and the combined effects of wind loads and ocean waves exacerbate vibration problems. Simultaneously, with the trend towards larger wind turbines, tower heights are constantly increasing, while tower diameters are less limited due to processing, manufacturing, and transportation factors, resulting in relatively lower natural frequencies and greater sensitivity to wind loads. High-tower wind turbines are prone to significant vibrations when encountering complex environments such as strong winds and turbulence. Therefore, the application of damper systems will provide strong support for the long-term stable operation of offshore wind power projects. The damper system will effectively reduce the vibration of wind turbine towers, improve the operational stability and safety of the units, and promote cost reduction and efficiency improvement in wind power projects. At the same time, this technology will also provide reliable vibration protection for tall structures such as offshore wind turbines, further expanding its application areas. However, the existing damper systems only use springs for vibration reduction. Spring vibration reduction is unstable and easily tilts due to uneven force, resulting in poor vibration reduction effect and failing to achieve the ideal state. Therefore, there is an urgent need for a damping spring vibration isolator for wind turbines to solve the above problems. Utility Model Content

[0003] In view of the problems mentioned above in the background technology, the purpose of this utility model is to provide a damping spring shock absorber for wind turbines.

[0004] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0005] A damping spring shock absorber for a wind turbine includes a base, a spring assembly mounted at the top center of the base, a top seat mounted on the top of the spring assembly, a protective sleeve installed between the base and the top seat, the protective sleeve including a fixed sleeve mounted on the base, a movable sleeve slidably mounted inside the fixed sleeve, the movable sleeve being mounted at the bottom of the top seat, a damping fluid cavity formed between the fixed sleeve and the movable sleeve, the damping fluid cavity being filled with damping fluid, and the spring assembly disposed within the damping fluid cavity;

[0006] The spring assembly includes a pad mounted on the base and a spring fixing seat mounted on the bottom of the top seat. A first spring, a second spring, and a third spring are installed between the pad and the spring fixing seat, and the first spring, the second spring, and the third spring are concentrically nested from the inside to the outside.

[0007] Further specified, the first, second, and third springs have different elastic coefficients: the first spring has the smallest elastic coefficient, the second spring has a moderate elastic coefficient, and the third spring has the largest elastic coefficient. Several SMA shape memory alloy wires are installed between the pad and the spring fixing seat. This structural design allows the springs with different elastic coefficients to provide elastic buffering force in stages according to changes in vibration amplitude and frequency when the wind turbine tower is subjected to vibration, thereby improving the shock absorption effect.

[0008] Furthermore, the inner side of the fixed sleeve is provided with a limiting groove, and a sealing limiting ring is slidably installed within the limiting groove. The sealing limiting ring is installed on the outer bottom of the movable sleeve. This structural design not only guides the sliding motion but also prevents leakage of the internal damping fluid.

[0009] Further specifying, the damping fluid chamber is equipped with a baffle plate, which is installed on the lower inner side of the movable sleeve. The baffle plate divides the damping fluid chamber into an upper damping fluid chamber and a lower damping fluid chamber. A through hole is provided in the center of the baffle plate, and the spring assembly is disposed within the through hole. Several damping holes are provided around the outer perimeter of the baffle plate. This structural design allows the spring assembly to drive the damping fluid to flow between the upper and lower damping fluid chambers through the through hole and damping holes during extension and retraction, utilizing the viscous resistance of the damping fluid to dissipate vibration energy.

[0010] Furthermore, the base and top seat are provided with mounting holes on their outer sides, and rubber pads are installed on the bottom of the base and the top of the top seat. This structural design facilitates the positioning and installation of the base and top seat.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. This utility model, by setting up a spring assembly, adopts a first spring, a second spring and a third spring that are concentrically nested from the inside to the outside. The multiple springs work together to effectively distribute the vibration load and avoid the tilting problem caused by uneven force on a single spring. At the same time, the protective sleeve structure between the base and the top seat forms a guiding constraint to ensure that the top seat slides stably along the axial direction during vibration, further ensuring the stability of the shock absorption process. This solves the core pain point of instability in traditional spring shock absorption. Furthermore, the combination of springs with different elastic coefficients can play a role in stages according to the vibration amplitude and frequency, achieving precise buffering of vibrations of different intensities.

[0013] 2. This utility model places the spring assembly inside the damping fluid cavity, forming a composite damping system that combines spring elastic buffering with damping fluid viscous energy dissipation. When the wind turbine vibrates, the spring assembly provides graded elastic buffering force through a multi-spring nested structure. At the same time, the spring extension and contraction drive the damping fluid to flow within the damping fluid cavity. The viscous resistance of the damping fluid is used to quickly dissipate vibration energy. Compared with single-spring damping, this method can more efficiently reduce vibration amplitude and significantly improve damping effect. Moreover, the damping fluid cavity is divided into upper and lower parts by a partition. When the spring extends and contracts, the damping fluid must flow through the through hole and damping hole. The fluid viscous resistance is used to convert the secondary vibration energy generated by the spring rebound into heat energy for dissipation, avoiding repeated vibration transmission. This synergistic mechanism of spring buffering and damping dissipation can simultaneously achieve energy buffering and vibration dissipation, forming a more stable damping system and effectively improving the seismic performance and operational safety of the wind turbine tower. Attached Figure Description

[0014] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0015] Figure 1 This is a schematic diagram of the axonal structure of a damping spring shock absorber for a fan, according to an embodiment of the present invention.

[0016] Figure 2 This is a cross-sectional structural schematic diagram of a damping spring shock absorber for a fan, according to an embodiment of the present invention.

[0017] Figure 3 This is an enlarged structural diagram of point A of a damping spring shock absorber for a wind turbine according to an embodiment of this utility model;

[0018] The symbols for the main components are explained below:

[0019] 1. Base, 2. Spring assembly, 3. Top seat, 4. Protective sleeve, 5. Fixed sleeve, 6. Movable sleeve, 7. Damping fluid chamber, 8. Pad, 9. Spring fixing seat, 10. First spring, 11. Second spring, 12. Third spring, 13. SMA shape memory alloy wire, 14. Limiting groove, 15. Sealing limiting ring, 16. Partition plate, 17. Upper damping fluid chamber, 18. Lower damping fluid chamber, 19. Through hole, 20. Damping hole, 21. Mounting hole, 22. Rubber pad. Detailed Implementation

[0020] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] Example 1, as Figure 1 and Figure 2As shown, a damping spring shock absorber for a wind turbine has a spring assembly 2 installed at the top center of a base 1, a top seat 3 installed on the top of the spring assembly 2, a protective sleeve 4 installed between the base 1 and the top seat 3, the protective sleeve 4 including a fixed sleeve 5 installed on the base 1, a movable sleeve 6 slidably installed inside the fixed sleeve 5, the movable sleeve 6 being installed at the bottom of the top seat 3, a damping liquid cavity 7 being formed between the fixed sleeve 5 and the movable sleeve 6, the damping liquid cavity 7 being filled with damping liquid, and the spring assembly 2 being disposed inside the damping liquid cavity 7;

[0022] The spring assembly 2 includes a pad 8 mounted on the base 1 and a spring fixing seat 9 mounted on the bottom of the top seat 3. A first spring 10, a second spring 11 and a third spring 12 are installed between the pad 8 and the spring fixing seat 9. The first spring 10, the second spring 11 and the third spring 12 are concentrically nested from the inside to the outside.

[0023] In this embodiment, during use, when the wind turbine tower is subjected to vibration, the top seat 3 pushes the movable sleeve 6 to slide along the fixed sleeve 5, and at the same time pushes the spring assembly 2 to play its role. The first spring 10, the second spring 11 and the third spring 12 provide elastic buffering force. Meanwhile, the extension and retraction of the spring assembly 2 drives the damping fluid to flow in the damping fluid cavity 7. The viscous resistance of the damping fluid is used to consume vibration energy, ensuring that the shock absorber can work continuously and stably, effectively reducing the vibration of the wind turbine tower, and improving the seismic performance and operational stability of the wind turbine tower.

[0024] Example 2, as Figure 2 As shown, this embodiment adds the following structure based on embodiment 1: the elastic coefficients of the first spring 10, the second spring 11 and the third spring 12 are different. The elastic coefficient of the first spring 10 is the smallest, the elastic coefficient of the second spring 11 is moderate, and the elastic coefficient of the third spring 12 is the largest. Several SMA memory alloy wires 13 are installed between the pad 8 and the spring fixing seat 9.

[0025] In this embodiment, when the wind turbine tower is subjected to vibration, the spring assembly 2 first plays its role. The first spring 10, the second spring 11 and the third spring 12 with different elastic coefficients are compressed or stretched in stages according to the vibration amplitude and frequency to provide elastic buffering force. The phased provision of elastic buffering force improves the shock absorption effect. When encountering strong vibration, the SMA memory alloy wire 13 deforms and absorbs a large amount of vibration energy. In the subsequent temperature recovery process, it uses its memory effect to restore the initial state and achieve self-reset.

[0026] Example 3, as Figure 2 and Figure 3 As shown, this embodiment adds the following structure based on embodiment 1: a limiting groove 14 is provided on the inner side of the fixed sleeve 5, and a sealing limiting ring 15 is slidably installed in the limiting groove 14. The sealing limiting ring 15 is installed on the bottom outer side of the movable sleeve 6.

[0027] In this embodiment, when the wind turbine tower is subjected to vibration, the top seat 3 pushes the movable sleeve 6 to slide along the fixed sleeve 5. The movable sleeve 6 drives the sealing limit ring 15 to slide in the limit groove 14 in the fixed sleeve 5, ensuring that while guiding the sliding, it can also prevent the internal damping fluid from leaking.

[0028] Example 4, as Figure 2 and Figure 3 As shown, this embodiment adds the following structure based on embodiment 1: a partition 16 is provided inside the damping fluid chamber 7. The partition 16 is installed on the lower side inside the movable sleeve 6. The partition 16 divides the damping fluid chamber 7 into two parts to form an upper damping fluid chamber 17 and a lower damping fluid chamber 18. A through hole 19 is provided in the center of the partition 16. The spring assembly 2 is disposed in the through hole 19. Several damping holes 20 are provided around the outer periphery of the partition 16.

[0029] In this embodiment, when the spring assembly 2 extends or retracts, it drives the damping fluid to flow between the upper damping fluid chamber 17 and the lower damping fluid chamber 18 of the damping fluid chamber 7 through the through hole 19 and the damping hole 20. The vibration energy is consumed by the viscous resistance of the damping fluid, and the impact energy is absorbed by the elastic deformation of the spring. However, secondary vibration will occur due to the rebound. The two damping fluids convert the kinetic energy stored in the spring into heat energy through the fluid viscous resistance, suppressing the rebound oscillation. The combination of the two can simultaneously achieve energy buffering and vibration dissipation, forming a more stable vibration reduction system.

[0030] Example 5, as Figure 1 and Figure 2 As shown, this embodiment adds the following structure based on embodiment 1: mounting holes 21 are provided on the outer side of the base 1 and the top seat 3, and rubber pads 22 are installed on the bottom of the base 1 and the top of the top seat 3.

[0031] In this embodiment, during installation, the shock absorber is fixed to the preset installation position at the bottom of the wind turbine tower by the mounting base 1 and the top seat 3. Bolts and other connecting parts are installed in the mounting hole 21 to ensure a firm connection, and rubber pads 22 are used to increase the stability after installation.

[0032] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A damping spring shock absorber for a fan, characterized in that: The device includes a base (1), a spring assembly (2) installed at the top center of the base (1), a top seat (3) installed at the top of the spring assembly (2), a protective sleeve (4) installed between the base (1) and the top seat (3), the protective sleeve (4) including a fixed sleeve (5) installed on the base (1), a movable sleeve (6) slidably installed inside the fixed sleeve (5), the movable sleeve (6) installed at the bottom of the top seat (3), a damping fluid cavity (7) is formed between the fixed sleeve (5) and the movable sleeve (6), the damping fluid cavity (7) is filled with damping fluid, and the spring assembly (2) is disposed inside the damping fluid cavity (7). The spring assembly (2) includes a pad (8) mounted on the base (1) and a spring fixing seat (9) mounted on the bottom of the top seat (3). A first spring (10), a second spring (11) and a third spring (12) are installed between the pad (8) and the spring fixing seat (9). The first spring (10), the second spring (11) and the third spring (12) are concentrically nested from the inside to the outside.

2. The damping spring shock absorber for a wind turbine according to claim 1, characterized in that: The first spring (10), the second spring (11) and the third spring (12) have different elastic coefficients. The first spring (10) has the smallest elastic coefficient, the second spring (11) has a moderate elastic coefficient, and the third spring (12) has the largest elastic coefficient. Several SMA memory alloy wires (13) are installed between the pad (8) and the spring fixing seat (9).

3. A damping spring shock absorber for a wind turbine according to claim 2, characterized in that: The inner side of the fixed sleeve (5) is provided with a limiting groove (14), and a sealing limiting ring (15) is slidably installed in the limiting groove (14). The sealing limiting ring (15) is installed on the bottom outer side of the movable sleeve (6).

4. A damping spring shock absorber for a wind turbine according to claim 3, characterized in that: The damping fluid chamber (7) is provided with a partition (16), which is installed on the lower side of the inside of the movable sleeve (6). The partition (16) divides the damping fluid chamber (7) into two parts, forming an upper damping fluid chamber (17) and a lower damping fluid chamber (18). The partition (16) has a through hole (19) in the center, and the spring assembly (2) is located in the through hole (19). The outer periphery of the partition (16) is provided with several damping holes (20).

5. A damping spring shock absorber for a wind turbine according to claim 4, characterized in that: The base (1) and the top seat (3) are provided with mounting holes (21) on their outer sides, and rubber pads (22) are installed on the bottom of the base (1) and the top of the top seat (3).

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