Wind power generation blade adjusting device

Abstract

The utility model discloses a wind power generation blade adjusting device which comprises an impeller hub shell and blade pieces installed on the outer wall of the peripheral side of the impeller hub shell in an annular array mode. A motor used for driving the rotary air duct to rotate is arranged on the back of each rotary air duct and located in the corresponding blade piece, and when the rotating speed and the rotating direction of the rotary air duct are adjusted, the power difference between the two sides of the corresponding blade piece can be changed. And the use and adjustment of the wind generating set at different wind speeds can be met, so that the wind power generation efficiency is improved and the operation time is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind power generation, and in particular relates to a wind power generation blade regulating device. Background Art

[0002] The principle of wind power generation is to use wind power to drive the windmill blades to rotate, and then increase the speed of the blades through the gearbox to drive the generator set to generate electricity. According to the existing wind power generation technology, a breeze speed of about three meters per second (the degree of a breeze) can start generating electricity. Wind power generation is becoming a trend in the world because it does not require the use of fuel and does not produce radiation or air pollution.

[0003] At present, conventional wind turbines are restricted by the type and windward angle of the blades. When the wind speed is lower than 3m / s, the pressure difference on both sides of the blades is small, which is not enough to drive the wind turbine to rotate. When the wind speed is greater than 25m / s, the pressure difference on both sides of the blades is large, resulting in a high linear velocity at the top of the impeller. In order to avoid damage to the blades, a locking device is usually set to shut down the wind turbine, which restricts the commissioning time of the wind turbine. Wind turbines are restricted by the type and angle of the blades. When the wind speed is lower than a certain value, the wind turbine automatically shuts down. This wind speed is the cut-in wind speed. The cut-out wind speed refers to the maximum wind speed at which the wind turbine is connected to the grid. If this wind speed is exceeded, the wind turbine will be disconnected from the grid and wind power generation will be shut down. If the wind speed is reached but the wind turbine is not disconnected, there may be risks such as tower collapse and impeller runaway.

[0004] Wind turbines use the aerodynamic force from rotor blades to convert wind energy into kinetic energy of blade rotation, thereby driving the generator to rotate and generate electricity. The working method of rotor blades is similar to that of airplane wings or helicopter rotor blades. At the same time, the cut-in and cut-out customs of wind turbines are set according to the length of the blades during installation. The lift range of the blades cannot be adjusted according to changes in wind speed, which makes it impossible to make good use of wind speed resources in wind power generation, reducing the operating time of wind turbines. Utility Model Content

[0005] The purpose of the utility model is to provide a wind power generation blade adjustment device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a wind power blade adjustment device, comprising an impeller hub shell and blade members in an annular array installed on the outer wall of the circumference of the impeller hub shell, each of the blade members is embedded with a rotating wind cylinder that is rotatably connected thereto, and each of the rotating wind cylinders is provided with an electric motor behind and in the blade member for driving the rotating wind cylinder to rotate, and when the speed and rotation direction of the rotating wind cylinder are adjusted, the power difference on both sides of the blade member can be changed.

[0007] The technical effects and advantages of the utility model are as follows: 1. It can reduce the cut-in speed of the wind turbine generator set, increase the removal speed of the wind turbine generator set, and increase the operating time of the wind turbine generator set;

[0008] 2. The lift of the blades can be adjusted according to changes in wind speed to improve adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0010] Figure 2 This is a schematic diagram of the counterclockwise rotation of the rotary air cylinder of the utility model;

[0011] Figure 3 This is a schematic diagram of the clockwise rotation of the rotary air cylinder of the utility model.

[0012] In the figure: 1. impeller hub housing; 2. blade member; 3. support column; 4. rotating air cylinder. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0014] The utility model provides Figure 1-Figure 3 A wind turbine blade adjustment device is shown. When the wind speed is lower than a certain value, the wind turbine automatically shuts down. This wind speed is the cut-in wind speed. The cut-out wind speed refers to the maximum wind speed of the wind turbine when it is connected to the grid. If the wind speed exceeds this value, the turbine will be cut off from the grid and the wind power generation will shut down. If the wind turbine is not cut out after reaching the cut-out wind speed, there may be risks of tower collapse and impeller runaway. In order to increase the cut-in speed and cut-out speed of the wind turbine, further increase the operating time of the wind turbine and improve reliability, a rotating wind cylinder 4 is installed on the wind turbine blade member 2. The speed and rotation direction of the rotating wind cylinder 4 are adjusted by an electric motor, which can change the power difference on both sides of the wind turbine blade member 2 and further increase the operating time of the wind turbine.

[0015] The device comprises an impeller hub shell 1, a support column 3 installed on the bottom surface of the impeller hub shell 1, and blade members 2 installed in an annular array on the outer wall of the circumference of the impeller hub shell 1. When the wind speed in the air is greater than the cut-in speed of the wind turbine, the blade members 2 drive the generator set to rotate, thereby generating electrical energy.

[0016] The blade 2 is an important component that converts the kinetic energy of wind into mechanical energy. It is composed of several blades. The shape of the blade is similar to the wing of an airplane. When the wind blows towards the blade, due to the different air flow rates above and below the blade, according to the Bernoulli equation, a pressure difference is generated on both sides of the blade, and the blade drives the wind wheel to rotate; since the blade type of the fan is fixed, the cut-in speed and cut-out speed of the wind turbine generator set are basically the same, and cannot be adjusted according to the wind speed, which shortens the operating time;

[0017] Each of the blade members 2 is internally embedded with a rotating air cylinder 4 which is rotatably connected thereto. The axial end of each rotating air cylinder 4 and located in the blade member 2 is provided with an electric motor for driving the rotating air cylinder 4 to rotate. The electric motor can drive the rotating air cylinder 4 to rotate clockwise or counterclockwise. When the rotation speed and direction of the rotating air cylinder 4 are adjusted, the power difference on both sides of the blade member 2 can be changed. When the flow rate in the air is less than the cut-in speed, the rotating air cylinder 4 is rotated counterclockwise. At this time, the air flowing through the upper part of the blade member 2 is further accelerated after passing through the rotating air cylinder 4. The air flowing through the lower part of the blade member 2 is reduced in flow rate under the action of the rotating air cylinder 4. According to the Bernoulli equation, the flow rate at the upper part of the blade member 2 is fast and the pressure is small, while the flow rate at the lower part of the blade is slow and the pressure is large, thereby driving the impeller to start rotating. Figure 2 shown.

[0018] Working principle:

[0019] When the air velocity exceeds the fan cut-out speed, the rotating wind tube 4 is adjusted to rotate clockwise. At this time, the air flowing through the upper part of the blade member 2 is decelerated by the rotating wind tube 4, and the air velocity and pressure of the upper part of the blade member 2 are reduced; the air velocity of the lower part of the blade member 2 is accelerated by the rotating wind tube 4, and the air velocity and pressure of the lower part of the blade member 2 are increased; the fan unit can continue to run without exceeding the allowable speed and causing equipment damage, such as Figure 3 shown.

[0020] Similarly, the lift regulation system can also be applied to various equipment locations where lift is generated due to wind speed changes, such as aircraft wings.

[0021] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited to it. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the utility model according to the technical scheme and utility model concept of the utility model, which should be covered by the protection scope of the utility model.

Claims

1. A wind turbine blade adjustment device, comprising an impeller hub shell (1), a support column (3) mounted on the bottom surface of the impeller hub shell (1), and a blade member (2) mounted on the outer wall of the impeller hub shell (1), characterized in that: Each of the blade members (2) is internally embedded with a rotating wind tube (4) which is rotatably connected thereto. Each of the rotating wind tubes (4) located in the blade member (2) has a motor for driving the rotating wind tube (4) to rotate. The rotation speed and direction of the rotating wind tube (4) are adjusted to change the power difference between the two sides of the blade member (2). When the flow rate in the air is less than the cut-in speed, the rotating wind tube (4) rotates counterclockwise, and the air flowing through the upper part of the blade member (2) is accelerated after passing through the rotating wind tube (4), and the flow rate of the air flowing through the lower part of the blade member (2) is reduced after passing through the rotating wind tube (4). When the air flow rate exceeds the cut-out speed of the fan, the rotating wind tube (4) is adjusted to rotate clockwise. At this time, the air flowing through the upper part of the blade member (2) is decelerated after passing through the rotating wind tube (4), and the air flow rate of the upper part of the blade member (2) is reduced, and the pressure is reduced. The air flow rate of the lower part of the blade member (2) is accelerated after passing through the rotating wind tube (4), and the air flow rate of the lower part of the blade member (2) is increased.

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