Vortex-induced-prevention and idle load reduction device for blades of wind generating set

Abstract

The utility model discloses a wind generating set blade vortex-induced and idling load reduction device which comprises an air bag assembly, a guide wheel set and a transfer cable, an air bag recovery bin is arranged at the blade root of a blade, the air bag assembly is stored in the air bag recovery bin, and the air bag assembly is connected with the guide wheel set. The guide wheel set and the transfer cable are both installed on the outer surface of the blade, the transfer cable penetrates through the guide wheel set, and the air bag assembly is driven by the guide wheel set to be conveyed to the designated area, close to the blade tip section, of the blade to be installed or recycled to the air bag recycling bin. When a unit is in an idling state, the air bag assembly can be released and transported to a designated area, formation of vortexes on the rear edge of the blade is damaged, vortex-induced vibration is prevented, the blade load during idling wind speed is reduced, when power generation is needed, the air bag assembly can be taken back in time, the overall aerodynamic shape of the blade is kept unchanged, and the power generation efficiency is improved. Good power generation efficiency of the blades is kept, and the safety of a unit is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of wind power generation, especially to a wind turbine blade vortex shedding and idling load reduction device. BACKGROUND

[0002] The blade is an important component of the wind turbine and is the power source of the wind turbine. With the continuous development of the large-scale wind turbine, the size of the blade is getting larger and larger, and the structure of the blade is getting more and more flexible. When the wind flows through the blade, vortex will be generated behind the blade. When the frequency of the vortex shedding from the blade is close to the frequency of the blade, the vortex-induced vibration of the blade will be caused, and large amplitude swing will occur at the position of the blade tip. Long-term vortex-induced vibration will damage the blade and have a great impact on the safety of the blade structure. In severe cases, the blade will be damaged, and even the blade will be broken and the tower will be tilted.

[0003] Currently, only the vortex-induced vibration problem of the blade during hoisting is considered, and a vibration prevention flow net is laid on the surface of the blade. However, it will have a negative effect on power generation when the wind turbine is running. SUMMARY

[0004] The utility model aims at overcoming the shortcomings and deficiencies of the prior art and providing a wind turbine blade vortex shedding and idling load reduction device. The air bag assembly is transported to the specified area under the idling state of the wind turbine to prevent the formation of vortex at the trailing edge of the blade and reduce the occurrence of vortex-induced vibration and the load of the blade at the idling wind speed. The air bag assembly can be retrieved in time when power generation is needed, the overall aerodynamic shape of the blade remains unchanged, the power generation efficiency of the blade is maintained, and the safety of the wind turbine is improved.

[0005] To achieve the above-mentioned purpose, the utility model provides a technical scheme of a wind turbine blade vortex shedding and idling load reduction device. The device comprises an air bag assembly, a guide wheel set and a transfer cable. The blade root of the blade is provided with an air bag recovery bin, the air bag assembly is stored in the air bag recovery bin, the guide wheel set and the transfer cable are installed on the outer surface of the blade, the transfer cable passes through the guide wheel set, and the guide wheel set drives the air bag assembly to be transported to the specified area near the blade tip segment of the blade for installation or retrieves the air bag assembly to the air bag recovery bin.

[0006] Preferably, an air pump is installed in the air bag recovery bin to inflate the air bag assembly for installation and deflate the air bag assembly for storage.

[0007] Preferably, the transfer cable is installed on the leading edge and trailing edge of the blade or the web area of the upper and lower surfaces of the blade.

[0008] Preferably, after installation, the airbag assembly wraps the entire designated area close to the blade tip section or wraps the trailing edge of the designated area.

[0009] Preferably, after installation, the airbag assembly is attached to the blade surface at the leading edge of a designated area close to the blade tip section, and swings with the wind at the trailing edge of the designated area under the action of the airflow.

[0010] Preferably, the airbag assembly is a single piece or a plurality of pieces spliced ​​together to cover a designated area along the length of the blade.

[0011] Preferably, the airbag assembly is made of multiple layers.

[0012] Preferably, the airbag recovery chamber is a cylindrical structure.

[0013] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0014] 1. By applying an airbag assembly to a designated area near the tip of the blade, the formation of vortices at the trailing edge of the blade can be destroyed, vortex-induced vibration of the blade can be prevented, the aerodynamic force acting on the blade can be reduced, and the safety of the blade and the unit can be improved.

[0015] 2. Through the airbag assembly, the aerodynamic shape of the blade tip area is optimized, the aerodynamic force acting on the blade is improved, and the wind load effect in the idling state at high wind speeds is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of the wind turbine blade vortex-prevention and idling load reduction device provided in this embodiment.

[0017] Figure 2 for Figure 1 AA cross-sectional view.

[0018] Figure 3 A schematic diagram of the partial structure of the airbag assembly. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below with reference to the embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0020] like Figures 1 to 3As shown, this embodiment discloses a wind turbine blade anti-vortex excitation and idling load reduction device, including an airbag assembly 1, a guide wheel assembly 2 and a transfer cable 3, wherein an airbag recovery bin 4 is provided at the root of the blade, and the airbag assembly 1 is stored in the airbag recovery bin 4, and the guide wheel assembly 2 and the transfer cable 3 are both installed on the outer surface of the blade 5, and the transfer cable 3 passes through the guide wheel assembly 2, and drives the airbag assembly 1 through the guide wheel assembly 2 to be transported to a designated area near the tip section of the blade 5 for installation or to recover the airbag assembly 1 to the airbag recovery bin 4.

[0021] Specifically, the airbag recovery bin 4 is a cylindrical structure with an air pump installed inside, which can inflate and deflate the airbag assembly 1. The airbag assembly 1 is inflated after being transported out of the airbag recovery bin 4. After the inflation is completed, it is transported to the designated area through the transfer line 3; when the airbag assembly 1 is recovered, it is transported to the vicinity of the blade root through the transfer line 3 for deflation, and then transported back to the airbag recovery bin 4 for storage.

[0022] Specifically, the transport cable 3 can be installed at the leading edge and the trailing edge of the blade 5 , or at the webs 6 on the upper and lower surfaces of the blade 5 .

[0023] Specifically, after installation, the airbag assembly 1 can wrap the entire designated area near the tip section of the blade 5 or wrap the trailing edge of the designated area, or it can be attached to the surface of the blade 5 at the leading edge of the designated area near the tip section of the blade 5, and swing with the wind at the trailing edge of the designated area under the action of the airflow.

[0024] Specifically, the airbag assembly 1 can be a single piece, or can be made up of multiple pieces, or can be made up of multiple layers, covering a designated area along the length of the blade.

[0025] To sum up, the above-mentioned device in this embodiment can destroy the formation of vortices at the trailing edge of the blade by installing an airbag assembly, prevent the occurrence of vortex-induced vibration and reduce the blade load at idling wind speed. When power generation is required, the airbag assembly can be retracted in time to keep the overall aerodynamic shape of the blade unchanged, maintain good power generation efficiency of the blade, optimize the aerodynamic shape of the tip area, improve the aerodynamic force acting on the blade, thereby reducing the wind load in the idling state at high wind speed, and improving the safety of the blade and the unit. It has practical application value and is worthy of promotion.

[0026] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A wind turbine blade vortex prevention and idling load reduction device, characterized in that: The invention comprises an airbag assembly (1), a guide wheel assembly (2) and a transfer cable (3), wherein an airbag recovery bin (4) is provided at the root of the blade, the airbag assembly (1) is stored in the airbag recovery bin (4), the guide wheel assembly (2) and the transfer cable (3) are both installed on the outer surface of the blade (5), and the transfer cable (3) passes through the guide wheel assembly (2) and drives the airbag assembly (1) to be transported to a designated area near the tip section of the blade (5) for installation or to be recovered to the airbag recovery bin (4).

2. The wind turbine blade vortex-prevention and idling load reduction device according to claim 1, characterized in that: An air pump is installed in the airbag recovery bin (4) for inflating and installing the airbag assembly (1) and defusing and storing the airbag assembly (1).

3. The wind turbine blade vortex prevention and idling load reduction device according to claim 1, characterized in that: The transport cable (3) is installed on the leading edge and the trailing edge of the blade (5), or the web (6) region on the upper and lower surfaces of the blade (5).

4. The wind turbine blade vortex-prevention and idling load reduction device according to claim 1, characterized in that: After installation, the airbag assembly (1) wraps the entire designated area close to the blade tip section on the blade (5) or wraps the trailing edge of the designated area.

5. The wind turbine blade vortex-inducing prevention and idling load reduction device according to claim 1, characterized in that: After installation, the airbag assembly (1) is attached to the surface of the blade (5) at the leading edge of a designated area close to the blade tip section, and swings with the wind at the trailing edge of the designated area under the action of the airflow.

6. The wind turbine blade vortex prevention and idling load reduction device according to claim 1, characterized in that: The airbag assembly (1) is a single piece or a plurality of pieces spliced ​​together, covering a designated area along the length of the blade.

7. The wind turbine blade vortex-inducing prevention and idling load reduction device according to claim 1, characterized in that: The airbag assembly (1) is composed of multiple layers.

8. The wind turbine blade vortex-prevention and idling load reduction device according to claim 1, characterized in that: The airbag recovery chamber (4) is a cylindrical structure.

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