Device and method for preventing blades from sweeping tower

Abstract

The present invention discloses a device and method for preventing blade tower sweep, comprising a radar sensor, a pitch adjustment mechanism, a hub, a ball hinge, and a blade root. The radar sensor is mounted on the side and top walls of the wind turbine nacelle, as well as the front and side walls of the wind turbine tower. The hub is mounted on the nacelle, the ball hinge is mounted on the hub, the blade root is connected to the ball hinge, the blade root is connected to the blade of the wind turbine, and the pitch adjustment mechanism is connected to the ball hinge. The present invention can adjust the blade pitch in real time based on rotor surface monitoring, effectively preventing blade tower sweep accidents caused by blade growth, and effectively increasing power generation.

Description

Technical Field

[0001] The present invention relates to the technical field of large-scale wind turbine generator sets, and in particular to a device and method for preventing blades from sweeping a tower. Background Art

[0002] As offshore wind turbines grow larger, their blades are becoming longer. Currently, the longest blade in the world has reached 126 meters. As blades grow longer, their flexibility increases, and their deformation in extreme conditions like wind shear also increases. Due to economic pressures, the blade's safety margin is shrinking, increasing the risk of blade sweeping the tower when wind shear or high wind speeds occur.

[0003] In order to reduce the occurrence of blade sweep accidents, traditional methods use technical means such as reducing blade load, increasing the main shaft inclination angle, and pre-bending the blades to reduce blade deformation or increase the distance from the blade tip to the tower. These methods will result in loss of power generation. At the same time, there is still the possibility of blade sweep in extreme positions.

[0004] Therefore, while ensuring power generation, preventing the anti-sweep tower from failing in extreme environments is a technical problem that needs to be solved at present. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a device and method for preventing blade sweeping that can change the blade inclination angle in real time according to the monitoring situation of the wind wheel surface, effectively avoid blade sweeping accidents caused by blade growth, and effectively increase power generation.

[0006] The present invention is achieved through the following technical solutions: a device for preventing blades from sweeping a tower, comprising a radar sensor, an inclination adjustment mechanism, a hub, a ball hinge, and a blade root. The side walls and top walls of a nacelle of a wind power device and the front walls and side walls of a tower of the wind power device are respectively installed with the radar sensor. The hub is arranged on the nacelle, the ball hinge is arranged on the hub, the blade root is connected to the ball hinge, the blade root is connected to a blade of the wind power device, and the inclination adjustment mechanism is connected to the ball hinge.

[0007] Furthermore: the ball hinge includes a hemispherical shell and a ball head, the hemispherical shell is connected to the wheel hub, the ball head is rotatably arranged in the hemispherical shell, the blade root is connected to the ball head, and the blade root extends from the through hole of the wheel hub and is connected to the blade.

[0008] Furthermore: the inclination adjustment mechanism includes a hydraulic rod, an adjustment plate, and a slide groove, the slide groove is opened on the hemispherical shell, a rotating rod is rotatably provided on the adjustment plate, the rotating rod is connected to the ball head, and the rotating rod is located in the slide groove, the hydraulic rod is arranged in the wheel hub, and the driving end of the hydraulic rod is connected to the adjustment plate.

[0009] Furthermore: the adjustment plate is provided with a motor, a driving gear, and a transmission gear. The motor is arranged on the adjustment plate, the output end of the motor is connected to the driving gear, the transmission gear is sleeved on the rotating rod, and the driving gear and the driven gear are meshed with each other.

[0010] Furthermore: a sealing ring is provided between the through hole and the rotating rod.

[0011] Furthermore: the chute is arc-shaped.

[0012] A method for preventing blades from sweeping the tower, based on the above-mentioned device for preventing blades from sweeping the tower, comprises the following steps:

[0013] Radar sensors are installed on the top wall, side wall, front wall and side wall of the wind turbine cabin.

[0014] The radar sensor installed on the top wall of the cabin is the main one, and the radar sensors installed on the side walls of the cabin, the front wall of the tower, and the side walls of the tower are auxiliary ones. They monitor whether the blades pass through the wind wheel surface during rotation. At the same time, they judge whether the subsequent rotation of the blades will hit the tower based on the wind measurement data. If not, the blades will maintain their original rotation. If so, the hydraulic rod is controlled to extend and retract to drive the adjustment plate and the rotating rod to move along the slide groove, and the rotating rod drives the ball head to drive the inclination angle of the blades to change.

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

[0016] 1. Radar sensors are installed on the side walls and top walls of the nacelle of the wind turbine equipment and the front walls and side walls of the tower of the wind turbine equipment, the hub is set on the nacelle, a ball hinge is set on the hub, the blade root is connected to the ball hinge, and the blade is connected to the blade root. The radar sensor is used to monitor whether the blade passes over the wind wheel surface during rotation. At the same time, it is judged according to the wind measurement data whether the subsequent rotation of the blade will hit the tower. If not, the blade keeps rotating in the original state. If so, the inclination adjustment mechanism is controlled to drive the ball hinge to drive the inclination angle of the blade to change, thereby realizing real-time change of the blade inclination angle according to the monitoring situation of the wind wheel surface. It can effectively reduce the large number of blade tower sweeping accidents that occur as the blade grows and the cost decreases, increase power generation, and reduce losses caused by accidents.

[0017] 2. By connecting the hemispherical shell and the wheel hub, the ball head is rotatably set in the hemispherical shell, the blade root is connected to the ball head, the blade root extends from the through hole of the wheel hub and is connected to the blade, a slide groove is opened on the hemispherical shell, and a rotating rod is rotatably set on the adjustment plate, the rotating rod is connected to the ball head, and the rotating rod is located in the slide groove. The driving end of the hydraulic rod is connected to the adjustment plate, and the adjustment plate is driven by the hydraulic rod to drive the rotating rod to move along the slide groove, thereby driving the ball head to drive the inclination angle of the blade to change, so that no pre-tilt angle is required when the blade is installed, and the installation is convenient and simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0019] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0020] Figure 3 The structure of the hub of the present invention is schematically shown Figure 1 ;

[0021] Figure 4 The structure of the hub of the present invention is schematically shown Figure 2 ;

[0022] Figure 5 It is a cross-sectional view of the wheel hub of the present invention.

[0023] Explanation of the reference numerals: 1-radar sensor, 2-tilt adjustment mechanism, 3-wheel hub, 4-ball hinge, 5-blade root, 6-hemispherical housing, 7-ball head, 8-through hole, 9-hydraulic rod, 10-adjustment plate, 11-slide, 12-rotating rod, 13-motor, 14-driving gear, 15-transmission gear, 16-sealing ring, 17-nacelle, 18-tower, 19-blade, 20-wind power equipment, 21-anemometer. DETAILED DESCRIPTION

[0024] Figures 1 to 5 This is a schematic structural diagram of an embodiment of a blade tower sweep prevention device provided by the present invention, which includes a radar sensor 1, a tilt adjustment mechanism 2, a hub 3, a ball hinge 4, and a blade root 5. The side walls and top walls of the nacelle 17 of the wind power equipment and the front wall and side walls of the tower 18 of the wind power equipment 20 are respectively installed with the radar sensor 1, the hub 3 is arranged on the nacelle 17, the ball hinge 4 is arranged on the hub 3, the blade root 5 is connected to the ball hinge 4, the blade root 5 is connected to the blade 19 of the wind power equipment 20, and the tilt adjustment mechanism 2 is connected to the ball hinge 4.

[0025] The ball hinge 4 includes a hemispherical shell 6 and a ball head 7. The hemispherical shell 6 is connected to the hub 3. The ball head 7 is rotatably arranged in the hemispherical shell 6. The blade root 5 is connected to the ball head 7, and the blade root 5 extends from the through hole 8 of the hub 3 and is connected to the blade 19.

[0026] The inclination adjustment mechanism 2 includes a hydraulic rod 9, an adjustment plate 10, and a slide groove 11. The slide groove 11 is opened on the hemispherical shell 6. A rotating rod 12 is rotatably provided on the adjustment plate 10. The rotating rod 12 is connected to the ball head 7 and is located in the slide groove 11. The hydraulic rod 9 is arranged in the wheel hub 3, and the driving end of the hydraulic rod 9 is connected to the adjustment plate 10.

[0027] When the blade 19 may sweep the tower, the hydraulic rod 9 telescopes to drive the adjustment plate 10 to move, the adjustment plate 10 drives the rotating rod 12 to move along the slide groove 11, and the rotating rod 12 drives the ball head 7 to drive the blade 19 to move, thereby adjusting the inclination angle of the blade 19 to prevent the blade 19 from sweeping the tower and colliding with the tower 18.

[0028] The adjusting plate 10 is provided with a motor 13, a driving gear 14, and a transmission gear 15. The motor 13 is provided on the adjusting plate 10, and the output end of the motor 13 is connected to the driving gear 14. The transmission gear 15 is sleeved on the rotating rod 12, and the driving gear 14 and the driven gear are engaged with each other.

[0029] When pitch change is required, the motor 13 drives the driving gear 14 to rotate, and the driving gear 14 drives the driven gear to drive the rotating rod 12 to rotate. The rotation of the rotating rod 12 drives the ball head 7 to rotate, and the ball head 7 drives the blades 19 to rotate, thereby achieving pitch change.

[0030] A sealing ring 16 is provided between the through hole 8 and the rotating rod 12 .

[0031] By providing a sealing ring 16 on the through hole 8 of the hub 3 , the sealing performance between the rotating rod 12 and the through hole 8 can be improved.

[0032] The chute 11 is arc-shaped.

[0033] A method for preventing blades from sweeping the tower, based on the above-mentioned device for preventing blades from sweeping the tower, comprises the following steps:

[0034] Radar sensors 1 are respectively installed on the top wall of the nacelle 17, the side wall of the nacelle 17, the front wall of the tower 18, and the side wall of the tower 18 of the wind turbine equipment;

[0035] The radar sensor 1 installed on the top wall of the cabin 17 is mainly used, and the radar sensors 1 installed on the side walls of the cabin 17, the front wall of the tower 18, and the side walls of the tower 18 are used as auxiliary. It monitors whether the blades 19 pass through the wind wheel surface during rotation. At the same time, it judges whether the subsequent rotation of the blades 19 will hit the tower 18 based on the wind measurement data. If not, the blades 19 maintain their original rotation. If so, the hydraulic rod 9 is controlled to extend and retract to drive the adjustment plate 10 and the rotating rod 12 to move along the slide groove 11, and the rotating rod 12 drives the ball head 7 to drive the inclination angle of the blades 19 to change.

[0036] The wind measurement data is the wind speed and direction monitored by the anemometer 21 of the wind power equipment 20 .

[0037] The above detailed description is a specific description of a feasible embodiment of the present invention. The embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification that does not depart from the present invention should be included in the patent scope of this case.

Claims

1. A device for preventing blades from sweeping the tower, characterized in that: The wind turbine comprises a radar sensor, a tilt adjustment mechanism, a hub, a ball hinge, and a blade root. The side walls and top wall of the nacelle of the wind turbine and the front wall and side walls of the tower of the wind turbine are respectively installed with the radar sensor. The hub is arranged on the nacelle, the ball hinge is arranged on the hub, the blade root is connected to the ball hinge, the blade root is connected to the blade of the wind turbine, and the tilt adjustment mechanism is connected to the ball hinge. The ball hinge includes a hemispherical shell and a ball head, wherein the hemispherical shell is connected to the wheel hub, the ball head is rotatably arranged in the hemispherical shell, the blade root is connected to the ball head, and the blade root extends from the through hole of the wheel hub and is connected to the blade; The inclination adjustment mechanism includes a hydraulic rod, an adjustment plate, and a slide groove. The slide groove is opened on the hemispherical shell. A rotating rod is rotatably provided on the adjustment plate. The rotating rod is connected to the ball head and is located in the slide groove. The hydraulic rod is arranged in the wheel hub, and the driving end of the hydraulic rod is connected to the adjustment plate.

2. The device for preventing blades from sweeping the tower according to claim 1, characterized in that: The regulating plate is provided with a motor, a driving gear and a transmission gear. The motor is provided on the regulating plate, the output end of the motor is connected to the driving gear, the transmission gear is sleeved on the rotating rod, and the driving gear and the transmission gear are meshed with each other.

3. The device for preventing blades from sweeping the tower according to claim 2, characterized in that: The sliding groove is arc-shaped.

4. A method for preventing blades from sweeping a tower, based on the device for preventing blades from sweeping a tower according to any one of claims 1 to 3, characterized in that: The following steps are included: Radar sensors are installed on the top wall, side wall, front wall and side wall of the wind turbine cabin. The radar sensor installed on the top wall of the cabin is the main one, and the radar sensors installed on the side walls of the cabin, the front wall of the tower, and the side walls of the tower are auxiliary ones. They monitor whether the blades pass through the wind wheel surface during rotation. At the same time, they judge whether the subsequent rotation of the blades will hit the tower based on the wind measurement data. If not, the blades will maintain their original rotation. If so, the hydraulic rod is controlled to extend and retract to drive the adjustment plate and the rotating rod to move along the slide groove, and the rotating rod drives the ball head to drive the inclination angle of the blades to change.

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