A new type of yaw structure of wind turbine generator system

Abstract

The utility model discloses a novel wind generating set yaw structure relates to wind power generation technical field, this novel wind generating set yaw structure, including cabin base and tower tube, the cabin base and tower tube are connected through novel yaw bearing between, be provided with the axle shape transmission part on the novel yaw bearing, be provided with the yaw drive on the cabin base, the yaw drive is connected with the transmission part transmission of novel yaw bearing, to make the cabin base and tower tube relatively rotate through yaw bearing, and the transmission part includes stress part and screw portion, has solved the inconvenient maintenance and replacement problem of current wind generating set yaw system.

Description

Technical Field

[0001] This utility model relates to the field of wind power generation technology, specifically a novel yaw structure for wind turbine generator sets. Background Technology

[0002] Currently, yaw systems are basically composed of a geared yaw bearing and a yaw drive. Due to errors in load calculation, wind instability, and deficiencies in assembly processes, yaw gear damage often occurs on-site. When the gear of the yaw bearing is damaged, there are two main repair methods: replace the entire yaw bearing or repair the damaged gear on-site at the tower.

[0003] However, replacing the entire yaw bearing requires using a crane to remove the unit's nacelle, replace the yaw bearing, and then hoist it back up, which is extremely costly. Up-to-tower maintenance requires bringing welding machines, heating equipment, and grinding equipment to the top of the tower for welding and hot work. In addition to the high cost and the risk of fire, there is also the risk that the bearing will deform too much after welding and become unusable, making maintenance and replacement inconvenient. Utility Model Content

[0004] This invention provides a novel yaw structure for wind turbine generator sets to solve the problem of inconvenient maintenance and replacement of existing yaw systems for wind turbine generator sets.

[0005] This utility model provides the following technical solution: a novel yaw structure for a wind turbine generator set, comprising a nacelle base and a tower, wherein the nacelle base and the tower are connected by a novel yaw bearing, and a shaft-shaped transmission component is provided on the novel yaw bearing; a yaw drive is provided on the nacelle base, and the yaw drive is connected to the shaft-shaped transmission component for transmission, so that the nacelle base and the tower rotate relative to each other through the novel yaw bearing.

[0006] As a preferred technical solution of this utility model, the novel yaw bearing includes an inner ring and an outer ring, the inner ring and the outer ring are connected by spherical rollers, the inner ring is fixedly connected to the nacelle base by bolts, and the outer ring is fixedly connected to the tower by bolts; there are multiple shaft-shaped transmission components, which are arranged in a ring array on the outer ring.

[0007] As a preferred embodiment of this utility model, the outer ring is fixedly connected to a first extension ring and a second extension ring, the first extension ring and the second extension ring being flush with the upper and lower surfaces of the outer ring, respectively; the shaft-shaped transmission component movably passes through the first extension ring and is connected to the second extension ring.

[0008] As a preferred technical solution of this utility model, the shaft-shaped transmission component includes a force-bearing part and a threaded part, the threaded part and the force-bearing part are integrally formed, and the threaded part is threadedly connected to the second extension ring; a hexagonal mounting hole is provided at the end of the force-bearing part away from the threaded part.

[0009] As a preferred technical solution of this utility model, the surface of the nacelle base is provided with an extended reinforcing convex plate, and each extended reinforcing convex plate is provided with a yaw drive. The yaw drive includes a yaw drive motor, a yaw reducer and a drive gear. The yaw drive motor and the yaw reducer are fixed on the extended reinforcing convex plate. The output shaft of the yaw reducer passes through the extended convex plate and is fixedly connected to the drive gear. The drive gear meshes with a shaft-shaped transmission component.

[0010] Compared with the prior art, this utility model provides a novel yaw structure for wind turbine generator sets, which has the following beneficial effects:

[0011] This new type of wind turbine yaw structure, with its detachable shaft transmission component, facilitates maintenance and replacement. Compared to the existing method that uses large and small gear transmissions, it can save on maintenance costs and time. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the inner ring structure of this utility model.

[0014] Figure 3 This is a schematic diagram of the shaft-shaped transmission component of this utility model.

[0015] In the diagram: 1. Nacelle base; 2. Tower; 3. Shaft-shaped transmission component; 301. Force-bearing part; 302. Threaded part; 303. Hexagonal mounting hole; 4. Inner ring; 5. Outer ring; 6. First extension ring; 7. Second extension ring; 8. Yaw drive motor; 9. Drive gear; 10. Extension reinforcing convex plate; 11. Yaw reducer. Detailed Implementation

[0016] 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 protection scope of the present utility model.

[0017] Please see Figures 1-3This utility model discloses a novel yaw structure for a wind turbine generator set, including a nacelle base 1 and a tower 2. The nacelle base 1 and the tower 2 are connected by a novel yaw bearing, and a shaft-shaped transmission component 3 is provided on the novel yaw bearing. A yaw drive is provided on the nacelle base 1, and the yaw drive is connected to the shaft-shaped transmission component 3 to drive the nacelle base 1 and the tower 2 to rotate relative to each other through the novel yaw bearing.

[0018] Specifically, the new yaw bearing includes an inner ring 4 and an outer ring 5. The inner ring 4 and the outer ring 5 are connected by spherical rollers. The inner ring 4 is fixedly connected to the nacelle base 1 by bolts, and the outer ring 5 is fixedly connected to the tower 2 by bolts. There are multiple shaft-shaped transmission components 3, which are arranged in a ring array on the outer ring 5.

[0019] The outer ring 5 has a first extension ring 6 and a second extension ring 7 fixedly connected to its surface. The first extension ring 6 and the second extension ring 7 are flush with the upper and lower surfaces of the outer ring 5, respectively. The shaft-shaped transmission component 3 movably passes through the first extension ring 6 and is connected to the second extension ring 7.

[0020] The shaft-shaped transmission component 3 includes a force-receiving part 301 and a threaded part 302. The threaded part 302 is integrally formed with the force-receiving part 301 and is threadedly connected to the second extension ring 7. A hexagonal mounting hole 303 is provided at the end of the force-receiving part 301 away from the threaded part 302.

[0021] In this embodiment, the yaw drive applies pressure to the force-bearing part 301 of the shaft transmission component 3, which can drive the inner ring 4 to rotate, so that the wind turbine always faces the wind direction.

[0022] Specifically, the surface of the nacelle base 1 is provided with an extended reinforcing convex plate 10. Each extended reinforcing convex plate 10 is provided with three sets of yaw drives. The yaw drive includes a yaw drive motor 8, a yaw reducer (11) and a drive gear 9. The yaw drive motor 8 and the yaw reducer 11 are fixed together on the extended reinforcing convex plate 10. The output shaft of the yaw reducer 11 passes through the extended reinforcing convex plate 10 and is fixedly connected to the drive gear 9. The drive gear 9 meshes with the shaft-shaped transmission component 3.

[0023] like Figure 1 As shown in this embodiment, there are two extended reinforcing convex plates 10, and a total of six yaw drives. The specific number of yaw drive motors 8 can be calculated according to the load to ensure that the total yaw torque provided by all yaw drive motors 8 can achieve normal yaw. The working principle and usage process of this utility model are as follows: The wind direction sensor is pre-installed on the wind turbine or other meteorological monitoring technologies are used to determine the wind direction. By calculating the deviation angle between the current wind turbine orientation and the wind direction, the angle with the smallest deviation is selected to turn to the latest wind direction. If the new wind direction is to the right of the current wind direction, the yaw drive drives the nacelle to rotate forward; if the new wind direction is to the left of the current wind direction, the yaw drive drives the nacelle to rotate in reverse.

[0024] The rotation direction and angle of the output shaft of the yaw drive motor 8 are determined. A photoelectric proximity switch and a cable unwinding encoder are installed below the nacelle base 1. By aligning the photoelectric proximity switch sensor with the teeth or shaft of the new yaw bearing, the rotation angle of the nacelle can be monitored. The cable unwinding encoder can monitor the total rotation angle of the nacelle after it deviates from the 0 position. When the total rotation angle in the same direction (forward or reverse) exceeds 720 degrees after the nacelle yaws from the 0 position, the control system will control the unit to force the cable unwinding action, so that the nacelle can rotate back to the 0 position, preventing the cable from the nacelle to the tower from being twisted.

[0025] The yaw drive motor 8 drives the drive gear 9 to rotate. The drive gear 9 meshes with the force-receiving part 301 of the shaft transmission component 3. The outer ring 5 is fixed on the tower 2 and does not move. Therefore, under the action of the drive gear 9 and the force-receiving part 301, the inner ring 4 drives the nacelle base 1 to rotate, so that the wind turbine rotor of the wind turbine faces the opposite direction of the wind, which is more conducive to the rotation of the wind turbine.

[0026] When the yaw drive motor 8 starts running, but the direction of the nacelle does not change accordingly, the control system will alarm based on abnormal current and incorrect angle of the yaw drive motor 8, requiring personnel to go up the tower for inspection. If the shaft transmission component 3 is damaged, the damaged shaft transmission component 3 can be unscrewed through the hexagonal mounting hole 303 and replaced with a new one.

[0027] In summary, the new wind turbine yaw structure, by setting a detachable shaft transmission component 3, facilitates maintenance and replacement. Compared with the existing method of using large and small gear transmission, it can save maintenance costs and time.

[0028] It should be noted that, in this document, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A new yaw structure of wind turbine generator system, comprising a nacelle base (1) and a tower (2), characterized in that: The nacelle base (1) and the tower (2) are connected by a new type of yaw bearing, and the new type of yaw bearing is provided with a shaft-shaped transmission component (3). The nacelle base (1) is provided with a yaw drive, which is connected to the shaft transmission component (3) so that the nacelle base (1) and the tower (2) rotate relative to each other through the new type of yaw bearing.

2. The novel yaw structure of a wind turbine generator set according to claim 1, characterized in that: The new type of yaw bearing includes an inner ring (4) and an outer ring (5). The inner ring (4) and the outer ring (5) are connected by spherical rollers. The inner ring (4) is fixedly connected to the nacelle base (1) by bolts, and the outer ring (5) is fixedly connected to the tower (2) by bolts. The shaft-shaped transmission component (3) has multiple components arranged in a ring array on the outer ring (5).

3. The novel yaw structure of a wind turbine generator set according to claim 2, characterized in that: The outer ring (5) is fixedly connected to a first extension ring (6) and a second extension ring (7), which are flush with the upper and lower surfaces of the outer ring (5), respectively. The shaft-shaped transmission component (3) moves through the first extension ring (6) and is connected to the second extension ring (7).

4. The novel yaw structure of a wind turbine generator set according to claim 2, characterized in that: The shaft-shaped transmission component (3) includes a force-receiving part (301) and a threaded part (302). The threaded part (302) is integrally formed with the force-receiving part (301), and the threaded part (302) is threadedly connected to the second extension ring (7). The force-bearing part (301) is provided with a hexagonal mounting hole (303) at the end away from the threaded part (302).

5. The novel yaw structure of a wind turbine generator set according to claim 1, characterized in that: The surface of the nacelle base (1) is provided with an extended reinforcing convex plate (10). Each extended reinforcing convex plate (10) is provided with three sets of yaw drives. The yaw drive includes a yaw drive motor (8), a yaw reducer (11) and a drive gear (9). The yaw drive motor (8) and the yaw reducer (11) are fixed together on the extended reinforcing convex plate (10). The output shaft of the yaw reducer (11) passes through the extended reinforcing convex plate (10) and is fixedly connected to the drive gear (9). The drive gear (9) meshes with the shaft-shaped transmission component (3).

Images