Wind power adaptive windmill damping system

Abstract

This invention belongs to the field of wind power generation technology, specifically disclosing a wind-adaptive windmill vibration damping system. It includes a damping block with a through-groove in the middle, housing a windmill bearing and a windmill shaft. Multiple hydraulic cylinders are fixedly mounted on the outer surface of the damping block, with hydraulic pistons slidably sealed within each cylinder. An outer pressure-bearing structure surrounds the damping block, its inner surface slidingly contacting the ends of the hydraulic pistons. A rear pressure-bearing structure is located behind the damping block, also housing cooperating hydraulic cylinders and pistons. An air chamber is also included, with all hydraulic cylinders and the air chamber interconnected. Each hydraulic cylinder is filled with liquid, and the air chamber contains both gas and liquid. A thrust bearing is located at the rear end of the windmill shaft, its rear end abutting against the end of a hydraulic piston on the rear pressure-bearing structure. The stiffness of the hydraulic damping system can be automatically adjusted according to wind speed, improving the stability and reliability of the windmill.

Description

Technical Field

[0001] This invention belongs to the field of wind power generation technology, and specifically relates to a wind-adaptive windmill vibration reduction system. Background Technology

[0002] Existing windmill vibration damping technology has some limitations in adjusting damping stiffness to adapt to different wind speeds. Traditional windmill vibration damping systems typically use fixed or preset damping stiffness, which cannot be adjusted according to the actual wind speed. This leads to the following problems:

[0003] When the wind is weak, the system is too rigid and cannot effectively reduce the vibration and shock of the windmill, which may lead to structural damage and noise generation. When the wind is strong, the system may be too weak to provide sufficient support and stability.

[0004] When wind conditions change abruptly, the system may fail to adapt and adjust its damping stiffness in time, leading to unstable operation of the wind turbine. This could affect the safety and reliability of the wind turbine and pose a potential risk to the entire wind energy system.

[0005] Therefore, existing wind turbine vibration reduction technology has limitations in that it cannot adjust the stiffness of the vibration reduction according to the wind force, which has a negative impact on the stability and reliability of the wind turbine. Summary of the Invention

[0006] To address the aforementioned shortcomings, the present invention aims to provide a wind-adaptive windmill vibration damping system. The stiffness of this hydraulic damping system automatically adjusts according to wind speed. When the wind is weak, the system's stiffness is low, effectively reducing windmill vibration. Conversely, when the wind is strong, the system's stiffness is high, providing sufficient support and stability. Even in the event of sudden wind changes or unexpected situations, the hydraulic damping system can rapidly adjust its stiffness via hydraulic transmission, improving the windmill's stability and reliability.

[0007] To achieve the above objectives, this invention provides a wind-adaptive windmill vibration damping system, including a damping block. A mounting groove is formed through the middle of the damping block, and a windmill bearing and a windmill shaft are installed within the mounting groove. Multiple hydraulic cylinders are fixedly mounted on the outer surface of the damping block. A hydraulic piston is slidably mounted within each hydraulic cylinder. An outer pressure-bearing structure is fitted around the damping block, and the inner surface of the outer pressure-bearing structure slides in contact with the ends of each hydraulic piston. A rear pressure-bearing structure is located behind the damping block, and similarly, hydraulic cylinders and hydraulic pistons are mounted on the rear pressure-bearing structure. An air chamber is also included, and the hydraulic cylinders and the air chamber are interconnected. Each hydraulic cylinder is filled with liquid, and the air chamber contains both gas and liquid. A thrust bearing is located at the rear end of the windmill shaft, and the rear end of the thrust bearing abuts against the end of a hydraulic piston on the rear pressure-bearing structure.

[0008] Furthermore, the damping block, along with the hydraulic cylinders, hydraulic pistons, external pressure-bearing structure distributed around it, and the windmill bearing installed inside the damping block, together constitute the damping unit. There are two damping units, coaxially arranged front and rear, with the windmill shaft rotating within the two damping units. The hydraulic cylinders and air chambers of the two damping units are interconnected.

[0009] Furthermore, the wind turbine's power generation rotor is mounted on the wind turbine shaft between the two vibration damping units.

[0010] Furthermore, the wind turbine's power generation rotor is connected to the wind turbine's shaft via a transmission.

[0011] Furthermore, the air chamber is located inside the rear pressure-bearing structure.

[0012] Furthermore, an air supply / venting port is provided on the air chamber.

[0013] Furthermore, the cross-section of the damping block perpendicular to the windmill's axis is polygonal.

[0014] Furthermore, by adjusting the number and size of the hydraulic cylinders and hydraulic pistons on the rear pressure-bearing structure, the maximum thrust that the hydraulic damping system on the rear pressure-bearing structure can withstand can be adjusted, thereby adjusting the upper limit of the hardness adjustment of the hydraulic damping system.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects:

[0016] 1. The stiffness of the hydraulic damping system of this invention can be automatically adjusted according to the wind force. When the wind force is low, the hydraulic damping system has low stiffness, effectively reducing the vibration and shock of the windmill. When the wind force is high, the hydraulic damping system has high stiffness, thereby providing sufficient support and stability. Even in the event of sudden changes in wind force or unexpected situations, the hydraulic damping system can quickly adjust the stiffness through hydraulic transmission, improving the stability and reliability of the windmill.

[0017] 2. The air chamber of the present invention is provided with an air supply port for connecting to an external air supply device. By supplying or releasing air, the hardness of the hydraulic damping system can be manually controlled. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the wind-adaptive windmill vibration reduction system according to Embodiment 1 of the present invention;

[0019] Figure 2 This is a three-dimensional disassembled view of the wind-adaptive windmill vibration reduction system according to Embodiment 1 of the present invention;

[0020] Figure 3 This is an internal structural diagram of the pressure-bearing structure of the present invention;

[0021] Figure 4This is a three-dimensional structural diagram of the wind-adaptive windmill vibration reduction system according to Embodiment 2 of the present invention.

[0022] In the diagram: 1-Shock damper, 2-Mounting groove, 3-Windmill shaft, 4-Hydraulic cylinder, 5-Hydraulic piston, 6-External pressure-bearing structure, 7-Rear pressure-bearing structure, 8-Air chamber, 9-Thrust bearing, 10-Generator rotor, 11-Air supply / release port, 12-Channel. Detailed Implementation

[0023] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0024] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms “set up”, “connected”, and “linked” should be interpreted broadly.

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0026] Example 1

[0027] Reference Figures 1 to 3 This embodiment discloses a wind-adaptive windmill vibration damping system, including a damping block 1. A mounting groove 2 is provided through the middle of the damping block 1, and a windmill bearing and a windmill shaft 3 are installed within the mounting groove 2. Multiple hydraulic cylinders 4 are fixedly mounted on the outer side of the damping block 1. A hydraulic piston 5 is slidably mounted within each hydraulic cylinder 4. An outer pressure-bearing structure 6 is sleeved around the damping block 1, and the inner surface of the outer pressure-bearing structure 6 slides in contact with the ends of each hydraulic piston 5. A rear pressure-bearing structure 7 is provided behind the damping block 1, and the rear pressure-bearing structure 7 also has mutually cooperating hydraulic cylinders 4 and hydraulic pistons 5. An air chamber 8 is also included, and the hydraulic cylinders 4 and the air chamber 8 are interconnected. Each hydraulic cylinder 4 is filled with liquid, and the air chamber 8 contains both gas and liquid. A thrust bearing 9 is provided at the rear end of the windmill shaft 3, and the rear end of the thrust bearing 9 abuts against the end of the hydraulic piston 5 on the rear pressure-bearing structure 7. To ensure that each hydraulic cylinder 4 is connected to the air chamber 8 below the liquid level, the connection point should be located at the bottom of the air chamber 8.

[0028] The principle and usage method of this embodiment are as follows:

[0029] Each hydraulic cylinder 4 and hydraulic piston 5, together with the air chamber 8 and the connecting channel 12, constitutes a hydraulic damping system. The extension and retraction of each hydraulic piston 5 in the hydraulic damping system are transmitted hydraulically to the gas in the air chamber 8. The ease with which the gas is compressed determines the stiffness of the hydraulic damping system. During normal operation, the stronger the wind, the greater the thrust received by the windmill's thrust bearing 9. The thrust bearing 9 compresses the hydraulic piston 5, which in turn forces more liquid into the air chamber 8, compressing the gas within. This increases both air and hydraulic pressure, which, through hydraulic transmission, synchronously increases the hydraulic pressure in each hydraulic cylinder 4, thus increasing the damping stiffness of the hydraulic damping system and allowing it to absorb greater vibration energy. Similarly, the weaker the wind, the lower the stiffness of the hydraulic damping system. This technical solution allows the stiffness of the hydraulic damping system to automatically adjust according to wind speed. When the wind is weak, the system's stiffness is low, effectively reducing the windmill's vibration; when the wind is strong, the system's stiffness is high, providing sufficient support and stability. Even when wind conditions change suddenly or unexpected situations occur, the hydraulic damping system can quickly adjust the stiffness through hydraulic transmission, improving the stability and reliability of the windmill.

[0030] As a further embodiment, the air chamber 8 can be integrated inside the rear pressure-bearing structure 7, which provides reliable protection for the air chamber 8.

[0031] As a further embodiment, the maximum thrust that the hydraulic damping system on the rear pressure-bearing structure 7 can withstand can be adjusted by adjusting the number and size of the hydraulic cylinders 4 and hydraulic pistons 5 on the rear pressure-bearing structure 7, thereby adjusting the upper limit of the hardness adjustment of the hydraulic damping system.

[0032] As a further embodiment, the air chamber 8 is provided with an air supply port 11 for connecting to an external air supply device. By supplying and releasing air, the function of manually controlling the hardness of the hydraulic damping system can be realized.

[0033] As a further embodiment, the cross-section of the damping block 1 perpendicular to the windmill shaft 3 is polygonal, preferably square. This design prevents the damping block 1 from rotating, avoiding unnecessary friction between the hydraulic piston 5 and the external pressure-bearing structure 6.

[0034] Example 2

[0035] In the structural design of large wind turbines, there are usually two wind turbine bearings, one at the front and one at the back, and the wind turbine's generator rotor 10 is located between the two wind turbine bearings. Based on this design, this embodiment is a further improvement on the first embodiment.

[0036] The damping block 1, along with the hydraulic cylinders 4, hydraulic pistons 5, and external pressure-bearing structure 6 distributed around it, and the windmill bearing installed inside the damping block 1, together constitute the damping unit. (Refer to...) Figure 4 In this embodiment, two coaxially arranged damping units are included, and the wind turbine shaft 3 rotates within the two damping units. The hydraulic cylinders 4 and air chambers 8 of the two damping units are interconnected. The wind turbine's generator rotor 10 is mounted on the wind turbine shaft 3 between the two damping units. This embodiment provides a more robust solution suitable for large wind turbines.

[0037] As a further solution in this embodiment: In order to avoid the vibration of the wind turbine shaft 3 affecting the stability of the power generation rotor 10, the power generation rotor 10 can be connected to the wind turbine shaft 3 through a transmission method such as belt or toothed chain instead of being directly mounted on the wind turbine shaft 3.

[0038] The above description only details the preferred embodiments of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wind-adaptive windmill vibration reduction system, characterized in that, The device includes a shock absorber (1), with a mounting groove (2) extending through the middle of the shock absorber (1) from front to back. A windmill bearing and a windmill shaft (3) are installed in the mounting groove (2). Multiple hydraulic cylinders (4) are fixedly mounted on the outer side of the shock absorber (1). A hydraulic piston (5) is slidably and sealed inside the hydraulic cylinder (4). An external pressure-bearing structure (6) is sleeved around the shock absorber (1), and the inner surface of the external pressure-bearing structure (6) slides in contact with the ends of each hydraulic piston (5). A device is located at the rear of the shock absorber (1). The device has a rear pressure-bearing structure (7), on which the hydraulic cylinder (4) and the hydraulic piston (5) are also provided to cooperate with each other; it also includes an air chamber (8), in which each hydraulic cylinder (4) and the air chamber (8) are interconnected; each hydraulic cylinder (4) is filled with liquid, and the air chamber (8) contains gas and liquid; a thrust bearing (9) is provided at the rear end of the windmill shaft (3), and the rear end of the thrust bearing (9) abuts against the end of the hydraulic piston (5) on the rear pressure-bearing structure (7).

2. The wind-adaptive windmill vibration reduction system according to claim 1, characterized in that, The damping block (1), the hydraulic cylinder (4), the hydraulic piston (5), the external pressure-bearing structure (6) distributed around the damping block (1), and the windmill bearing installed inside the damping block (1) together form a damping unit; there are two damping units, which are arranged coaxially front and back, and the windmill shaft (3) rotates in the two damping units; the hydraulic cylinder (4) and the air chamber (8) of the two damping units are interconnected.

3. The wind-adaptive windmill vibration reduction system according to claim 2, characterized in that, The wind turbine includes a power generation rotor (10) mounted on the wind turbine shaft (3) between the two damping units.

4. The wind-adaptive windmill vibration reduction system according to claim 3, characterized in that, The power generation rotor (10) of the wind turbine is connected to the wind turbine shaft (3) via a transmission.

5. The wind-adaptive windmill vibration reduction system according to claim 1, characterized in that, The air chamber (8) is located inside the rear pressure-bearing structure (7).

6. The wind-adaptive windmill vibration reduction system according to claim 1, characterized in that, An air supply port (11) is provided on the air chamber (8).

7. The wind-adaptive windmill vibration reduction system according to claim 1, characterized in that, The cross section of the shock absorber (1) perpendicular to the windmill shaft (3) is polygonal.

8. The method of using the wind-adaptive windmill vibration reduction system according to claim 1, characterized in that, By adjusting the number and size of the hydraulic cylinders (4) and hydraulic pistons (5) on the rear pressure-bearing structure (7), the maximum thrust that the hydraulic damping system on the rear pressure-bearing structure (7) can withstand is adjusted, thereby adjusting the upper limit of the hardness adjustment of the hydraulic damping system.

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