Wind power generation equipment

Abstract

To provide a wind power generator which rotates without exceeding an allowable rotation number even when receiving excessive wind force.SOLUTION: A wind power generator includes: a vertical rotary shaft 22 connected to a power generator; multiple vanes 10 fixed to the rotary shaft 22; multiple blades fixed to multiple shafts included in the vanes 10; and a control unit which rotates the multiple blades according to the rotation number of the rotary shaft 22 to change gaps between the blades.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a wind turbine generator. [Background technology]

[0002] The use of renewable energy is required to reduce greenhouse gas emissions. Wind power generation uses wind power as an energy source to generate electricity, and there are high hopes for its effective use, with various methods being proposed.

[0003] Wind turbines use wind power to rotate propellers and generate electricity from the resulting rotational force. They are classified into horizontal-axis and vertical-axis types depending on the direction of the rotation axis. Compared to horizontal-axis types, vertical-axis types have fewer problems with noise and the risk of falling, and offer greater freedom in terms of installation location. In addition, there is no need to align the rotation axis with the wind direction, as there is with horizontal-axis types, allowing for a simpler structure. Furthermore, because the generators and other components can be placed downwards, stability can be increased when the turbine is installed offshore.

[0004] An example of a vertical axis wind power generator is the wind power generator disclosed in Patent Document 1. This generator has a plurality of vertical blades attached to a vertically installed rotating shaft via support arms. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-210913 A Summary of the Invention [Problem to be solved by the invention]

[0006] The wind power generation device disclosed in Patent Document 1 has a mechanism that brakes the rotation when the vertical blades receive excessive wind force and exceed the allowable rotation speed. However, since the wind force acting on the vertical blades does not change, there is a risk that the vertical blades and their supports will be destroyed. Alternatively, it is necessary to increase the strength of the vertical blades and their supports so that they will not be destroyed even when they receive excessive wind force.

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a wind turbine generator that rotates without exceeding the allowable rotation speed even when subjected to excessive wind force. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a wind turbine generator including a vertical shaft connected to a generator, a plurality of blades fixed to the vertical shaft, held by a frame, extending vertically and arranged parallel to each other a plurality of blades fixed to a plurality of shafts; and a control unit that rotates the plurality of blades in accordance with the number of rotations of the vertical shaft to change the gap between the blades; a horizontal frame disposed at a position dividing the frame into two parts, upper and lower, and having an end protruding outward from the frame; and a horizontal support portion disposed on a horizontal surface and supporting the end from above and below by the repulsive force of magnets. Have do . Effect of the Invention

[0010] The wind turbine generator of the present invention can rotate and generate electricity without exceeding the allowable rotation speed even when subjected to excessive wind force by rotating the blades to change the gap between the blades and thereby changing the wind force received by the blades. [Brief description of the drawings]

[0011] [Figure 1] 1 is a perspective view of a wind power generator according to an embodiment in a state where the blades are closed; [Diagram 2] FIG. 1 is a perspective view of a wind power generator according to an embodiment with its blades open; [Diagram 3] FIG. 1 is a perspective cutaway view illustrating a blade opening / closing mechanism of a wind power generator according to an embodiment of the present invention. [Figure 4] FIG. 4 is a partially enlarged view (part A in FIG. 3) illustrating the blade opening / closing mechanism of the wind power generator according to the embodiment; [Diagram 5]FIG. 1 is a plan view of a wind power generator according to an embodiment with its blades closed; [Figure 6] FIG. 1 is a front view of a wind power generator according to an embodiment with its blades closed; [Figure 7] FIG. 1 is a plan view of a wind power generator according to an embodiment with its blades open; [Figure 8] FIG. 1 is a front view of a wind power generator according to an embodiment with its blades open; [Figure 9] 6 is a partially enlarged cross-sectional view of a peripheral holding portion of the wind power generator according to the embodiment (part B of FIG. 6). [Figure 10] FIG. 1 is a diagram showing a schematic configuration of a wind turbine generator according to an embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A wind turbine generator 300 according to an embodiment will be described below with reference to the drawings. As shown in the perspective view of Fig. 1, the wind power generator 1 of the wind power generation device 300 according to the embodiment has a base 30 and a rotating part 100 arranged on the upper surface of the base 30. The rotating part 100 has three blades 10, and each blade 10 has three blades 13, 15, 17, which will be described later, and each of the three blades 13, 15, 17 is rotatable. Fig. 1 shows the three blades 13, 15, 17 in a closed state, and Fig. 2 shows them in an open state.

[0013] (Structure of Rotating Part 100) The rotating section 100 is supported by the support columns 24 arranged at the four corners of the upper surface of the base 30 and extending upward. The upper ends of the support columns 24 are connected to the horizontal support section 23, which is circular in plan view. The vertical support section 21, which is bow-shaped in side view, is connected to the horizontal support section 23. The central parts of the vertical support sections 21 are arranged at 90 degree intervals on the horizontal support section 23 in plan view, and the upper and lower ends of each of the vertical support sections 21 are arranged so as to face the center of the ring of the horizontal support section 23. The first rotating support section 25 is connected to the upper ends of the four vertical support sections 21. The second rotating support section 26 is connected to the lower ends of the four vertical support sections 21. The rotating shaft 22, which is a vertical shaft, is supported by the first rotating support section 25 and the second rotating support section 26 so as to be rotatable in the vertical direction. Three wings 10 are fixed to the rotating shaft 22 at equal angular intervals in plan view. 3, the rotating shaft 22 extends inside the base 30, and a generator 31 is connected to the lower end of the rotating shaft 22. The generator 31 has a rotation speed detection mechanism (not shown).

[0014] (Wing 10 Structure) As shown in Figs. 3 and 4, the blade 10 has a crescent-shaped frame 11, a horizontal frame 27 arranged at a position dividing the frame 11 into two parts, an upper part and a lower part, blade rotation shafts 12, 14, and 16 rotatably held by the frame 11 and arranged parallel to each other in the vertical direction, and blades 13, 15, and 17 fixed to the blade rotation shafts 12, 14, and 16. The blades 13, 15, and 17 have flat plates arranged to fill the plane surrounded by the frame 11. The blades 13 and 15 have walls vertically erected on one side of the flat plate at a position far from the rotation shaft 22 of each flat plate and at an end close to the arched portion of the frame 11. The blade 17 has a wall vertically erected on one side of the flat plate at an end close to the arched portion of the frame 11.

[0015] (Rotating structure of blades 13, 15, and 17) The rotating structure of the blades 13, 15, 17 is arranged inside the horizontal frame 27 as shown in FIG. 4. The blades 13, 15, 17 are fixed to the blade rotation shafts 12, 14, 16, respectively, and a bevel gear 48 is fixed to each of the blade rotation shafts 12, 14, 16. The bevel gear 48 meshes with a gear 47, which is fixed to a drive shaft 49 that is held inside the horizontal frame 27 and is rotatable around the extension direction of the horizontal frame 27 as a rotation shaft. A spur gear 46 is fixed to the end of the drive shaft 49 on the side of the rotation shaft 22. A rack 45 that meshes with the spur gear 46 is arranged vertically. A rod 44 is arranged vertically at the lower end of the rack 45, and the lower end of the rod 44 is connected to a bracket 43 shown in FIG. 3. The bracket 43 has two disks arranged at a distance from each other, and is movable up and down along the rotation shaft 22. A plurality of cam followers 42 are disposed between the two disks of the bracket 43, and each of the cam followers 42 is connected to the shaft of a linear cylinder 41.

[0016] As a result, when the shaft of the linear cylinder 41 is moved in and out, the cam follower 42 connected to the shaft of the linear cylinder 41 moves up and down, the bracket 43 that sandwiches the cam follower 42 from above and below moves up and down, the rod 44 connected to the bracket 43 moves up and down, the rack 45 connected to the rod 44 moves up and down, and the spur gear 46 meshing with the rack 45 rotates, causing the drive shaft 49 to rotate, which in turn rotates the three gears 47 formed on the drive shaft 49, which in turn rotate the blade rotation shafts 12, 14, 16 meshing with the gears 47, which in turn rotate the blades 13, 15, 17 fixed to the blade rotation shafts 12, 14, 16.

[0017] (Perimeter support structure) The horizontal frame 27 of the wing 10 protrudes outward from the frame 11, and is disposed inside the horizontal support part 23, which has a U-shaped cross section, as shown in the cross section in FIG. 9. Magnets 51-54 are disposed inside the horizontal support part 23 and at the end of the horizontal frame 27. The arrows on the magnets 51-54 shown in FIG. 9 indicate the N pole and S pole of the magnet, with the tip of the arrow being the N pole and the base being the S pole. Magnets 52 and 53 are disposed at the end of the horizontal frame 27 inside the horizontal support part 23, with the upper part being the S pole and the lower part being the N pole. Magnets 51 and 54 are disposed at the top and bottom of the inside of the horizontal support part 23, facing the magnet 52, and facing the magnet 53. The lower part of the magnet 51 is the S pole, and the upper part of the magnet 54 is the N pole.

[0018] As a result, the repulsive forces between the magnets act on the outer end of the horizontal frame 27, which is held without contact inside the horizontal support part 23 and serves as a holding part. This outer periphery support mechanism keeps the rotating part 100 horizontal. Therefore, without this outer periphery support mechanism, it would be necessary to increase the strength of the rotating shaft 22 so that it would not bend due to the wind force acting laterally on the blades 10, but the presence of this outer periphery support mechanism makes it unnecessary to increase the strength of the rotating shaft 22.

[0019] (How it works) Next, a method of generating wind power using the wind power generating device 300 according to this embodiment will be described. As shown in Fig. 10, a control unit 200 and a battery 210 are connected to a wind power generator 1.

[0020] When the wind is weak, the position of the axis of the linear cylinder 41 is set so that the gap formed by the blades 13, 15, and 17 in the blade 10 is the smallest. The wind power generator 1 in this state is shown in FIG. 5 in a plan view and in FIG. 6 in a side view. The blades 13, 15, and 17 of the blade 10 have a wall on one side and no wall on the other side, so a difference occurs between the wind force received on one side of the blade 10 and the wind force received on the other side. The difference in wind force causes the wind power generator 1 to rotate. In this way, the wind power generator rotates due to the difference between the wind force received on one side of the blade 10 and the wind force received on the other side, so the wind direction relative to the wind power generator can be from any direction in a plan view. In addition, since the wind power generator 1 may not start rotating depending on the wind force, it is also possible to send electricity stored in the battery 210 to the generator 31, use the generator 31 as a drive motor to rotate the wind power generator, and use the inertial force generated by the rotation to rotate the wind power generator.

[0021] The rotating state of the wind power generator 1 is monitored by a signal sent from a rotation speed detection mechanism of the generator 31 to the control unit 200. When the rotation speed exceeds a predetermined rotation speed, the direct-acting cylinder 41 is operated by a signal sent from the control unit to move the shaft of the direct-acting cylinder 41 in and out. By moving the shaft of the direct-acting cylinder 41 in and out, the blades 13, 15, and 17 rotate, and a gap is created in the blade 10. This gap reduces the difference between the wind force received on one side of the blade 10 and the wind force received on the other side. Figure 7 shows a plan view of the blade 10 with the gap maximized, and Figure 8 shows a side view. As a result, the force that rotates the wind power generator 1 is weakened, and the rotation speed is suppressed. Also, when the rotation speed of the wind power generator 1 becomes smaller than the predetermined rotation speed, the direct-acting cylinder 41 is operated by a signal sent from the control unit 200 to rotate the blades 13, 15, and 17 to reduce the gap in the blade 10. This increases the wind force received by the blades 10, and the rotation speed of the wind power generator 1 increases.

[0022] As a result, even when the wind force is small, the wind power generator 1 rotates by receiving a sufficient amount of wind by reducing the gap between the blades 10, and even when the wind force becomes excessively large, the gap between the blades 10 is increased to allow the wind to escape, and the wind power generator 1 rotates without exceeding the allowable rotation speed. [Explanation of symbols]

[0023] 1. Wind turbine 10 wings 11 Frame 12, 14, 16 Blade rotation shaft 13, 15, 17 Feather 21 Vertical support 22 Rotation axis 23 Horizontal support 24 Posts 25 First rotating support part 26 Second rotating support 27 Horizontal Frame 30 Foundation 31 Generator 41 Linear cylinder 42 Cam follower 43 Bracket 44 Rod 45 racks 46 Spur Gear 47 Gears 48 Bevel Gear 100 Rotating Part 200 Control section 210 Battery 300 Wind Power Generation Equipment

Claims

[Claim 1] a vertical shaft connected to a generator; A plurality of wings fixed to the vertical shaft; A plurality of blades are fixed to a plurality of shafts that are held by a frame portion of the blade and extend vertically and are arranged parallel to each other; a control unit that rotates the plurality of blades in accordance with a rotation speed of the vertical shaft to change the gap between the blades; A horizontal frame is disposed at a position dividing the frame portion into two parts, upper and lower, and has an end portion protruding outward from the frame portion; a horizontal support part provided on a horizontal surface and supporting the end part from above and below by the repulsive force of magnets; A wind power generation device having the above structure.

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