Dual damping device and damping method for wind driven generator

Abstract

The double-damping device comprises a first fixing sleeve matched with the surface of a tower drum, the surface of the first fixing sleeve is connected with the top of a spring damping device through a fixing block, the bottom of the spring damping device is connected with the top of a bearing platform, and the bottom of the bearing platform is connected with a rubber support through a pile; vibration transmitted to the draught fan supporting structure and the foundation is effectively reduced, the stress of the structure can be reduced, the service life of the draught fan and the supporting structure is prolonged, meanwhile, impact force and vibration generated when the draught fan operates can be absorbed, and therefore the stability of the draught fan is improved, and it can be guaranteed that the draught fan stably operates under different working conditions.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine vibration reduction, in particular to a double vibration reduction device and a vibration reduction method for a wind turbine. Background Art

[0002] Wind power generation is an environmentally friendly and sustainable form of energy. Wind power generation technology is relatively mature and has been widely used in many countries. With the continuous advancement of technology, the cost continues to decrease. Wind turbines are generally installed on the ground, and the bottom is subjected to huge torque. Natural disasters such as earthquakes have a huge impact on wind turbines, so shock-absorbing devices are needed to protect wind turbines.

[0003] During operation, wind turbines will vibrate due to the action of wind, and vibration will have an adverse effect on the stability and life of the equipment. Therefore, the design of the shock-absorbing device needs to consider the effect of wind on the structure, as well as the deformation and response of the structure under the action of external forces. When designing a wind turbine shock-absorbing device, it is necessary to consider the natural vibration frequency of the wind turbine itself and the excitation caused by external wind force, so as to select appropriate shock-absorbing measures. In addition, the design of the shock-absorbing device requires the selection of appropriate materials to ensure that it has good durability, elasticity and energy absorption performance. Commonly used materials include metals, rubbers, polymers, etc. The characteristics of these materials have an important influence on the shock-absorbing effect. Summary of the invention

[0004] The object of the present invention is to overcome the above-mentioned shortcomings and provide a double shock absorbing device and a shock absorbing method for a wind turbine, which can ensure the stable operation of the wind turbine under different working conditions.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a double shock-absorbing device for a wind turbine, comprising a first fixed sleeve that cooperates with the surface of the tower, the surface of the first fixed sleeve is connected to the top of the spring shock-absorbing device through a fixed block, the bottom of the spring shock-absorbing device is connected to the top of the pedestal, and the bottom of the pedestal is connected to the rubber bearing through a pile.

[0006] Preferably, the spring damping device comprises a guide rod fixedly connected to the fixed block, the bottom of the guide rod extends into the guide cylinder and cooperates with the spring in the guide cylinder.

[0007] Preferably, the guide rod is fixedly connected to the fixing block by bolts, the bottom of the guide cylinder is fixedly connected to the fixing ring, and the fixing ring is connected to the top of the base by bolts.

[0008] Preferably, the base at the bottom of the tower is fixedly connected to the inside of the second fixed sleeve, and the outside of the second fixed sleeve is fixedly connected to the top of the base through a support block.

[0009] Preferably, the surface of the first fixed sleeve is connected to corresponding three groups of spring damping devices through three fixed blocks.

[0010] Preferably, the three fixing blocks are evenly distributed at equal intervals along the outer circumference of the first fixing sleeve.

[0011] Preferably, the bottom of the cap is connected to the rubber bearing through three piles.

[0012] Preferably, the three piles are evenly distributed in a circular array at the bottom of the cap.

[0013] In addition, the present invention discloses a shock absorbing method for the above-mentioned double shock absorbing device for a wind turbine, which comprises the following steps: S1. When the wind turbine is subjected to external wind force or other vibration sources, the vibration will be transmitted to the spring shock absorbing device through the first fixing sleeve and the fixing block; S2. The spring inside the spring shock absorber is compressed or stretched, absorbing energy, and releasing energy after the vibration stops, so that the system returns to a balanced state, reducing the vibration of the fan and improving the stability of the fan operation; S3. When an earthquake occurs, the rubber bearing at the bottom will absorb the energy generated by the earthquake and convert it into strain energy inside the rubber, thereby slowing down the propagation speed of vibration or impact; the elastic properties of the rubber material allow the absorbed energy to be evenly dispersed to the surrounding structures or equipment, thereby reducing the impact of vibration or impact on other components; when the external vibration or impact disappears, the rubber material will gradually return to its original shape, and the rubber bearing will be ready to absorb the next vibration or impact again.

[0014] Beneficial effects of the present invention: 1. The present invention effectively reduces the vibration transmitted to the fan support structure and foundation, helps to reduce the stress on the structure, and prolongs the service life of the fan and the support structure. At the same time, it can absorb the impact force and vibration generated when the fan is running, thereby improving the stability of the fan and ensuring the stable operation of the fan under different working conditions.

[0015] 2. The rubber bearing in the present invention can effectively reduce the vibration transmitted to the fan support structure and foundation, help to reduce the stress on the structure, extend the service life of the fan and the support structure, and absorb the impact and vibration generated when the fan is running, thereby improving the stability of the fan; this is crucial to ensure the normal operation of the fan under severe weather conditions; while reducing shock, it also reduces the noise generated by the vibration transmitted to the surrounding structure and the ground. This helps to reduce the operating noise of the fan and reduce the impact on the surrounding environment and residents.

[0016] 3. The fixed sleeve in the present invention is easy to install, has a simple structural design, and has low construction difficulty, which helps to ensure the stability and safety of the fan, improve the operating performance of the fan, and extend the service life of the fan.

[0017] 4. The device of the present invention adopts a shock-absorbing mechanism of the synergistic effect of springs and rubber bearings. When the wind speed is high, the load effect is transmitted from top to bottom by the blades and first reaches the spring shock-absorbing device. At this time, the main shock-absorbing device is the spring at the bottom; when an earthquake occurs, the load is transmitted from bottom to top, and the seismic effect transmitted from the ground first reaches the rubber bearing, which absorbs most of the energy. At this time, the main shock-absorbing device is the rubber bearing; the two shock-absorbing methods adopted by this device effectively ensure the stable operation of the fan under low working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a vertical cross-sectional structural schematic diagram of a double shock absorbing device for a wind turbine; Figure 2 It is a schematic diagram of the three-dimensional structure of the area where the spring shock absorbing device is located in the present invention; Figure 3 It is a schematic diagram of the internal structure of the spring shock absorbing device of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the area where the rubber bearing is located. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0020] Example 1: Figure 1-4 As shown, a double shock absorbing device for a wind turbine includes a first fixed sleeve 2 matched with the surface of a tower 1, the surface of the first fixed sleeve 2 is connected to the top of a spring shock absorbing device through a fixed block 3, the bottom of the spring shock absorbing device is connected to the top of a pedestal 8, and the bottom of the pedestal 8 is connected to a rubber bearing 10 through a pile 9.

[0021] Preferably, the spring shock absorbing device includes a guide rod 11 fixedly connected to the fixed block 3, the bottom of the guide rod 11 extends into the guide cylinder 5 and cooperates with the spring 13 in the guide cylinder 5. The guide rod 11 and the guide cylinder 5 can be slidably matched, and combined with the elastic force of the spring 13, a shock absorbing effect can be achieved.

[0022] Preferably, the guide rod 11 is fixedly connected to the fixing block 3 via bolts 4 , the bottom of the guide cylinder 5 is fixedly connected to the fixing ring 12 , and the fixing ring 12 is connected to the top of the base 8 via bolts 4 .

[0023] Preferably, the base at the bottom of the tower 1 is fixedly connected to the inside of the second fixed sleeve 6, and the outside of the second fixed sleeve 6 is fixedly connected to the top of the support platform 8 through the support block 7. In this embodiment, after the wind turbine base is embedded in the second fixed sleeve 6, it is closely fitted with the wind turbine tower, the support platform 8 is located on the ground, and the device below it is shallowly buried in the ground.

[0024] Preferably, the surface of the first fixed sleeve 2 is connected to the corresponding three sets of spring damping devices through three fixed blocks 3. More preferably, the surface of the first fixed sleeve 2 is fixedly connected to the fixed blocks 3 through bolts. Preferably, the three fixing blocks 3 are evenly distributed at equal intervals along the outer circumference of the first fixing sleeve 2. Through this even distribution, the first fixing sleeve 2 can be made more stable and firm.

[0025] Preferably, the bottom of the cap 8 is connected to the rubber bearing 10 via three piles 9 .

[0026] Preferably, the three piles 9 are evenly distributed in a circular array at the bottom of the cap 8. Through this even distribution, the cap 8 can be more evenly stressed and the shock absorption process can be performed more stably.

[0027] The working principle of this embodiment is as follows: When the wind turbine is in operation, it will be affected by the wind and generate vibrations, which will be transmitted to the tower and foundation, thus affecting the stability and life of the structure. The vibrations generated by the wind turbine are transmitted to the spring shock absorber at the bottom of the wind turbine. The built-in spring will be compressed or stretched to absorb energy, and release energy after the vibration stops, so that the system returns to a balanced state, effectively reducing the vibration of the wind turbine and improving the stability of the wind turbine operation.

[0028] When an earthquake occurs, the rubber bearings at the bottom absorb the energy generated by the earthquake and convert it into strain energy inside the rubber, thereby slowing down the propagation speed of vibration or impact. The elastic properties of the rubber material allow the absorbed energy to be evenly dispersed to the surrounding structures or equipment, thereby reducing the impact of vibration or impact on other components. When the external vibration or impact disappears, the rubber material will gradually return to its original shape, and the shock absorber will be ready to absorb the next vibration or impact again. At the same time, wind turbines will generate noise during operation, and this noise will not only affect the surrounding environment and wildlife, but may also affect nearby residents. Rubber bearings can help reduce the noise generated by the transmission of vibration to the structure, thereby reducing the operating noise of wind turbines.

[0029] The second fixed sleeve is used to fix the base of the fan, which is also equipped with three support blocks 7. When the wind speed is too high, the wind load on the fan blades will increase, which will cause the blades to generate greater torsional and bending forces. These forces will be transmitted to the bottom of the fan through the fan shaft. The fan blades and mechanical parts may generate greater vibrations, and these vibration forces will also be transmitted to the bottom of the fan. Secondly, the fan blades will generate inertial forces when rotating at high speeds, especially when the wind speed or wind direction changes. These inertial forces will also be transmitted to the bottom of the fan, and the ground effect will also be enhanced, resulting in an increase in the wind force on the bottom. Increasing the burden on the bottom of the fan, this fixed sleeve will share the load borne by the bottom of the fan, reduce the loss at the bottom of the fan, improve the operating performance of the fan, and extend the service life of the fan.

[0030] Embodiment 2: A vibration reduction method for a double vibration reduction device of a wind turbine generator, comprising the following steps: S1. When the wind turbine is subjected to external wind force or other vibration sources, the vibration will be transmitted to the spring shock absorbing device through the first fixing sleeve 2 and the fixing block 3; S2. The spring 13 inside the spring shock absorber is compressed or stretched, absorbing energy, and releasing energy after the vibration stops, so that the system returns to a balanced state, reducing the vibration of the fan and improving the stability of the fan operation; S3. When an earthquake occurs, the rubber bearing 10 at the bottom absorbs the energy generated by the earthquake and converts it into strain energy inside the rubber, thereby slowing down the propagation speed of vibration or impact; the elastic properties of the rubber material enable the absorbed energy to be evenly dispersed to the surrounding structures or equipment, thereby reducing the impact of vibration or impact on other components; when the external vibration or impact disappears, the rubber material will gradually return to its original shape, and the rubber bearing 10 will be ready to absorb the next vibration or impact again.

[0031] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A dual shock absorbing device for a wind turbine, comprising a first fixing sleeve (2) matched with the surface of a tower (1), characterized in that: The surface of the first fixed sleeve (2) is connected to the top of the spring shock absorbing device via a fixed block (3), the bottom of the spring shock absorbing device is connected to the top of the support platform (8), and the bottom of the support platform (8) is connected to the rubber support (10) via a pile (9).

2. A double shock absorbing device for a wind turbine according to claim 1, characterized in that: The spring damping device comprises a guide rod (11) fixedly connected to the fixed block (3); the bottom of the guide rod (11) extends into the guide cylinder (5) and cooperates with the spring (13) in the guide cylinder (5).

3. A double shock absorbing device for a wind turbine according to claim 2, characterized in that: The guide rod (11) is fixedly connected to the fixed block (3) via bolts (4), the bottom of the guide cylinder (5) is fixedly connected to the fixed ring (12), and the fixed ring (12) is connected to the top of the support platform (8) via bolts (4).

4. A double shock absorbing device for a wind turbine according to claim 1, characterized in that: The base at the bottom of the tower (1) is fixedly connected to the inside of the second fixed sleeve (6), and the outside of the second fixed sleeve (6) is fixedly connected to the top of the support platform (8) via a support block (7).

5. A double shock absorbing device for a wind turbine according to claim 1, characterized in that: The surface of the first fixed sleeve (2) is respectively connected to the corresponding three groups of spring shock absorbing devices via three fixed blocks (3).

6. A double shock absorbing device for a wind turbine according to claim 5, characterized in that: The three fixing blocks (3) are evenly distributed at equal intervals along the outer circumference of the first fixing sleeve (2).

7. A dual shock absorbing device for a wind turbine according to claim 1, characterized in that: The bottom of the cap (8) is connected to the rubber support (10) via three piles (9).

8. A dual shock absorbing device for a wind turbine according to claim 1, characterized in that: The three piles (9) are evenly distributed in a circular array at the bottom of the cap (8).

9. A vibration reduction method for a double vibration reduction device for a wind turbine generator according to any one of claims 1 to 8, characterized in that: It includes the following steps: S1. When the wind turbine generator is subjected to external wind force or other vibration sources, the vibration is transmitted to the spring damping device through the first fixing sleeve (2) and the fixing block (3); S2. The spring (13) inside the spring damping device is compressed or stretched, absorbing energy, and releasing the energy after the vibration stops, so that the system returns to a balanced state, reducing the vibration of the fan and improving the stability of the fan operation; S3. When an earthquake occurs, the rubber bearing (10) at the bottom absorbs the energy generated by the earthquake and converts it into strain energy inside the rubber, thereby slowing down the propagation speed of the vibration or impact. The elastic properties of the rubber material allow the absorbed energy to be evenly dispersed into the surrounding structure or equipment, thereby reducing the impact of the vibration or impact on other components. When the external vibration or impact disappears, the rubber material gradually returns to its original shape, and the rubber bearing (10) is ready to absorb the next vibration or impact again.

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