JP2003049761A - Support shaft and wind power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support shaft that can suppress a flow separation and suppress a vibration resulting from a flow separation by disposing a regulating member in a separation range correspondingly to change in a flow direction of fluid. SOLUTION: An outer tube 22 is mounted outside a column 13 circumferentially turnable by radial bearings 23. The outer tube 22 is provided with a pair of regulating members 24. The regulating members 24 having a plate form are extended in an axial direction of the outer tube 22 and mounted on the outer tube 22 so as to align a width direction with a radial direction of the outer tube 22. The width of the regulating members 24 is a fifth of the diameter of the outer tube 22, and an angle made by both regulating members 24 is 80 deg.. Neat a lower outer portion of the outer tube 22, a motor 27 is disposed to drive the outer tube 22 circumferentially according to a signal from an anemoscope positioned at a given distance from the column 13. On an outer circumferential surface of the outer tube 22, a gear 28 capable of meshing with a driving gear 27a mounted on an output shaft of the motor 27 is mounted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support shaft and a wind turbine generator, and more particularly to a support shaft suitable for suppressing vibration of the support shaft due to a flow separation phenomenon, and a wind turbine generator equipped with the support shaft. It relates to the device.

[0002]

2. Description of the Related Art In the flow separation phenomenon on a surface of an object in a fluid, for example, a disturbance generated in a separation region of a flow constituted by a separation flow separated from the surface of the object propagates upstream and influences the object. May be given. For example, as shown in FIG. 9A, in the fluid flow around the cylinder 91, when the flow velocity reaches a predetermined velocity, a Karman vortex 92a may occur in the separation region 92 on the rear side of the cylinder 91 of the flow. . In the figure, the flow direction of the fluid is indicated by arrow 93, and in the smooth flow field outside the separation region 92 (steady flow region 94), the flow direction is the direction indicated by arrow 93. When the Karman vortex 92a is generated, there is a problem that the cylinder 91 vibrates due to the influence of the Karman vortex 92a, which causes structural fatigue of the cylinder 91 and eventually the cylinder 91 is broken.

Therefore, the applicants of the present invention have shown in FIG.
The structure shown in is proposed. 8 in the column 91
A pair of restriction members 95 are attached at 0 ° intervals.
The restriction member 95 is located in the separation area 92 and does not reach the steady flow area 94 with respect to the flow from the direction in which the angle (θ) formed by each restriction member 95 and the fluid flow direction is 140 °. It is provided in. In this state, the regulating member 95
Suppresses flow separation, and the turbulent vortex 9 generated in the separation region 92
Suppressing the upstream propagation of the disturbance excited by 6,
The vibration of the cylinder 91 due to the influence of the Karman vortex 92a can be suppressed.

[0004]

However, the regulating member 9
Since No. 5 is fixed immovably with respect to the column 91, the regulating member 95 cannot be arranged in the flow separation region when the flow direction of the fluid changes, and vibration caused by the flow separation is effective. There is a problem that it cannot be controlled.

The present invention has been made in view of the above circumstances, and an object thereof is to arrange a regulating member in the separation region in response to a change in the flow direction of a fluid to suppress flow separation.
An object of the present invention is to provide a support shaft capable of suppressing vibration caused by flow separation and a wind turbine generator including the support shaft.

[0006]

In order to achieve the above object, the invention according to claim 1 is arranged in a separation region between a steady flow region and an object surface, and the object surface is separated from the separation region. The gist of the present invention is to provide a restricting member that is capable of suppressing flow separation in a state in which the flow expands and does not reach the steady flow region, and that includes a driving unit that can drive in the circumferential direction in response to changes in the flow direction of the fluid.

According to the present invention, when the flow direction of the fluid changes, the regulating member is driven in the circumferential direction by the drive means so as to correspond to the change in the flow direction, and is arranged in the flow separation region. The flow separating is suppressed by the regulating member arranged in this way, and the vibration of the support shaft due to the flow separating is suppressed. In addition, noise due to vibration is also suppressed.

According to a second aspect of the present invention, in the first aspect of the invention, at least two regulating members are provided. According to the present invention, the regulating member can be arranged so as to suppress the separation of the flow on both sides of the support shaft in the fluid flow direction, and the vibration and noise of the support shaft can be effectively suppressed. In addition, an even number of restriction members,
By mounting symmetrically with respect to the plane including the center line of the support shaft, vibration and noise of the support shaft can be suppressed more effectively.

According to a third aspect of the present invention, in the invention according to the first or second aspect, the restriction member is attached to a tubular member that is rotatably attached to the support shaft. That is the summary.

According to the present invention, when the tubular member is rotated by the driving means, the regulating member is rotated together with the tubular member. Therefore, the structure in which the restricting means is supported rotatably in the circumferential direction of the support shaft can be formed relatively easily by the tubular member.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the drive means can drive the regulating member by receiving the force of the fluid. The point is that it is a fin.

According to the present invention, when the flow direction of the fluid changes, the fins are pushed by the force of the fluid to rotate the regulating member to a position where the flow separation can be suppressed. Therefore, the regulating member can be autonomously driven only by the fluid flow, and a driving unit that does not require a power source can be formed with a simple structure.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the regulating member itself also serves as the driving means and is rotated by receiving the force of the fluid. The main point is to be able to move.

According to the present invention, the regulating member is rotated by receiving the force of the fluid by itself and is moved to the position where the flow separation can be suppressed. Can be reduced.

According to a sixth aspect of the present invention, in the invention according to any one of the first to fifth aspects, the restricting members are dispersed at a plurality of positions in the axial direction of the support shaft and are mutually separated. The gist is that it is independently rotatable in the circumferential direction.

According to the present invention, the regulating members dispersed at a plurality of locations are driven in the direction corresponding to the flow direction of the fluid received by each of the regulating members. Therefore, even when the fluid flow direction changes in the axial direction of the support shaft, vibration and noise of the support shaft can be effectively suppressed.

A seventh aspect of the present invention is based on the fact that the support shaft according to any one of the first to sixth aspects is used as a support for a wind turbine. According to this invention,
The operation and effect of the invention according to any one of claims 1 to 6 can be similarly obtained in the column of the wind turbine generator that receives the wind that rotates the wind turbine.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment in which the present invention is embodied in a wind turbine generator will be described below with reference to FIGS.

FIG. 2 shows a schematic perspective view of the wind turbine generator.
As shown in FIG. 2, in the wind turbine generator 11, a support 13 as a support shaft made of a metal pipe is erected vertically upward from a fixed portion 12 fixed to the ground. A support case 14 that is rotatable with respect to the support column 13 is arranged at the upper end of the support column 13, and a generator 15 is mounted on the support case 14. A rotor shaft 16 is horizontally extended in the generator 15,
A disk-shaped hub 17 is attached to its tip.
The hub 17 has three blades 18a, 18b, 18c.
Are mounted on a circle concentric with the rotor shaft 16 at angular intervals of 120 degrees. Rotor shaft 16, hub 17, blade 1
The wind turbine 19 is composed of 8a to 18c. Also,
On the side of the support case 14 opposite to the blades 18a to 18c, the direction in which the wind blows by receiving wind (upward direction)
Fins 20 that can drive the windmill 19 to face
Has been extended.

FIG. 1 (a) is a schematic partial perspective view of the support shaft, and FIG. 1 (b) is a schematic partial vertical sectional view thereof.
(C) shows a schematic cross-sectional view. As shown in FIG. 1B, an outer cylinder 22 as a cylinder member is attached to the outside of the column 13 by a radial bearing 23 so as to be rotatable in the circumferential direction.

As shown in FIGS. 1A and 1C, on the outer peripheral surface 22a of the outer cylinder 22 as the object surface, a pair of restricting members 24 are symmetrical with respect to the plane including the center line of the column 13. Is attached to. Each regulation member 24 is plate-shaped, extends in the axial direction of the outer cylinder 22, and is attached so that the width direction thereof is the radial direction of the outer cylinder 22. Regulation member 24
Is 1/5 of the diameter of the outer cylinder 22 in this embodiment. In addition, the angle formed by both regulating members 24 is 80 °.

The upper portion of the column 13 projects upward from the outer cylinder 22, and an anemoscope 26 is attached to the upper portion of the column 13 via a bracket 25 as shown in FIG. The wind vane 26 is arranged at a position apart from the support column 13 or the wind turbine 19 by a predetermined distance so that the wind not affected by the support column 13 or the wind turbine 19 can be measured.

As shown in FIG. 1B, a motor 27 is arranged near the outside of the lower portion of the outer cylinder 22. Outer cylinder 22
A gear 28 capable of meshing with the drive gear 27a attached to the output shaft of the motor 27 is attached to the outer peripheral surface 22a of the motor 27. The motor 27 rotates the outer cylinder 22 via the drive gear 27a and the gear 28. It can be driven in any direction. The wind vane 26, the motor 27, the drive gear 27a, and the gear 28 constitute drive means.

Next, the operation of the wind turbine generator constructed as described above will be described. When the wind blows, the wind hits the tail fins 20 and the wind force rotates the support case 14. Then, the support case 14 stops at the position where the tail fin 20 has the least wind resistance. At this time,
The tail fin 20 is located at a position that projects in the leeward direction, and the windmill 19 faces in the upwind direction. In this way, the tail fin 20 causes the wind turbine 19 to always face the windward direction.

Further, as shown in FIG. 3 (a), from the opposite side of both the regulating members 24, the direction of the wind in the figure is indicated by the one-dot chain line arrow 2
When the wind schematically illustrated by 9 blows on the column 13, the angle formed by the direction in which the wind blows and each regulation member 24 is 140 °.
In this case, the motor 27 is not driven, and the wind flows along the outer peripheral surface 22a of the outer cylinder 22, and flow separation occurs at a predetermined position around the restriction member 24, as shown by a separation flow 30 indicated by a chain line. The restriction member 24 is arranged in a separation region 32 between the steady flow region 31 flowing a predetermined distance from the outer peripheral surface 22a of the outer cylinder 22 and the outer peripheral surface 22a of the outer cylinder 22, and is separated from the outer peripheral surface 22a. 32, and has not reached the steady flow region 31. The upstream propagation of the disturbance excited by the turbulent vortex 33 generated in the separation region 32 is
The restriction member 24 suppresses the vibration of the support column 13 due to the flow separation.

Further, when the wind direction changes from the direction shown by the alternate long and short dash line (arrow 29) to the direction shown by the solid line (arrow 35), the motor 27 is operated based on the signal from the wind vane 26, and FIG. As shown in b), the outer cylinder 22 is rotated by a predetermined amount in accordance with the wind direction so that the angle formed by the direction in which the wind blows and each regulation member 24 is 140 °. For this reason, both the regulation members 24 are arranged in the flow separation region 36 corresponding to the wind direction indicated by the arrow 35. The upstream propagation of the disturbance excited by the turbulent vortex 37 generated in the separation region 36 is suppressed by the both restricting members 24 arranged in the separation region 36, and the vibration of the column 13 caused by the flow separation is suppressed. It As described above, even if the wind direction changes, the restricting member 24 is arranged in the flow separation region 36 correspondingly to suppress the flow separation, and the column 13 caused by the flow separation is suppressed.
Vibration is suppressed. In addition, noise due to vibration is also suppressed.

According to this embodiment, the following effects are obtained. (1) The regulating member 24 is attached to the outer cylinder 22 rotatably supported by the support column 13 by the radial bearing 23, and is rotated by a motor 27 that drives the outer cylinder 22 based on a signal from the anemometer 26. Corresponding to the change, it is arranged at a position where flow separation can be suppressed. Therefore, even if the wind direction changes, the flow separation can be effectively suppressed and the vibration and noise of the column 13 can be suppressed by the relatively simple configuration.

(2) The wind vane 26, the motor 27, the drive gear 27a, and the gear 28 can surely arrange the regulating member 24 that suppresses flow separation in an appropriate position in response to changes in the wind direction.

(3) By suppressing the vibration of the support column 13 with respect to the wind blown from an arbitrary direction, it is possible to suppress the decrease in the life of the support column 13 and ensure the durability. (4) Since the vibration of the support column 13 can be suppressed in accordance with the change in the blowing direction of the wind, the cost for improving the strength of the support column 13 to withstand the vibration can be reduced. For example, the strut 13 can be made lighter in weight and the diameter can be reduced.

(5) An even number (two) of regulating members 24 are attached to the outer cylinder 22 symmetrically with respect to a plane including the center line of the column 13. Therefore, the vibration and noise of the column 13 can be suppressed more effectively.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. In this embodiment,
The difference from the above embodiment is that the outer cylinder and the regulating member are divided into a plurality of parts. The same parts as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 4, the outer cylinder and the regulating member of this embodiment are cut by a surface perpendicular to the axial direction,
It has a shape divided into a plurality of parts in the axial direction. Each of the outer cylinder divided portions 42 is attached to the column 13 by a radial bearing so as to be rotatable in the circumferential direction. Outer peripheral surface 42 of each outer cylinder dividing portion 42 as the object surface
In a, a fin 44 as a driving unit is attached to the center of the portion sandwiched by the restriction member dividing portions 43. The fins 44 are plate-shaped, and in response to a change in the blowing direction of the wind, the fins 44 are exposed to the wind so that the restricting member dividing portions 43 are arranged in positions where the flow separation is suppressed in the flow separation region. The length and width are set so that the cylinder dividing portion 42 can be driven in the circumferential direction. The outer cylinder dividing portion 42 is rotatable independently of each other, and the regulating member dividing portion 43 adjacent in the axial direction is provided.
The fins 44 do not abut each other.
In this embodiment, the bracket 25 and the wind vane 2
6, the motor 27, and the gear 28 are not attached.

As shown in FIG. 5A, each outer cylinder dividing portion 4
When the wind blows from a direction different from the direction of 140 ° from both the restriction member dividing portions 43 of 2, the wind hits the fins 44,
The wind force causes the outer cylinder dividing portion 42 to rotate. And FIG.
As shown in (b), the outer cylinder dividing portion 42 stops at the position where the fins 44 have the smallest wind resistance. At this time, the fins 44 are located in the leeward direction, and the direction in which the wind blows is 140 ° from both the restriction member dividing portions 43. In this manner, the fins 44 position the restriction member dividing portions 43 in positions where flow separation is suppressed in the flow separation region 36.

According to this embodiment, in addition to the effects (1) and (3) to (5) of the first embodiment, the following effects are obtained. (6) Each of the outer cylinder dividing parts 42 receives the wind and receives the outer cylinder dividing parts 4
Fin 44 that can be driven to rotate 2 to a predetermined position
Is attached. Therefore, it is possible to form a driving means that can autonomously drive the outer cylinder dividing portion 42 by only the wind without using any other power source with a simple structure.

(7) The restricting member and the outer cylinder are cut along a plane orthogonal to the support shaft and divided into a plurality of parts in the axial direction of the support column 13 so that they can be rotated in the circumferential direction independently of each other. There is. For this reason, each outer cylinder division part 42 is rotated in accordance with the direction in which the wind is received, and each restriction member division part 43 is arranged in a position where flow separation is suppressed in the flow separation region. Therefore, even when the wind blowing direction changes in the axial direction of the column 13, vibration and noise of the column 13 can be effectively suppressed.

(8) Since the restricting member and the outer cylinder are divided, they can be easily attached when the outer cylinder dividing portions 42 are inserted through the support columns 13 and attached. The embodiment is not limited to the above-described embodiments, and may be modified as follows, for example.

Outer cylinder dividing portion 42 and regulating member dividing portion 43
Is not limited to being provided over the entire length of the support column 13, and for example, as shown in FIG. 6A, the length is such that flow separation can be suppressed, and the outer cylinder dividing portion 42 is dispersed along the axial direction.
The regulating member dividing portion 43 may be arranged. in this case,
It is preferable to dispose a large number of restricting member dividing portions 43 on the upper side of the column 13 that is relatively apt to vibrate away from the fixed section 12 rather than the lower side of the column 13 near the fixed section 12.

In the first embodiment, the regulating member 24
Is not limited to being provided over the entire length of the outer cylinder 22, and may be dispersed and arranged over the axial direction, as in the case of FIG. 6A, for example.

The outer cylinder 22 is not limited to being rotatably supported by the support column 13 by the radial bearings 23, and for example, as shown in FIG. 6B, a pair of upper and lower outer cylinders 22 are attached. It may be supported by the thrust bearing 61. In this case, when the outer cylinder 22 is relatively long and the load is relatively large, the load can be effectively supported by the lower thrust bearing 61.

The outer cylinder dividing portion 42 may also be rotatably supported on the column 13 by the thrust bearing 61, as in the above. The outer cylinder 22 (outer cylinder divided portion 42) is not limited to be formed in a circular cross section, and may be formed, for example, in a substantially elliptical cross section as shown in FIG.

Regulation member 24 (division member dividing portion 43)
Is not limited to being attached to the cylindrical outer cylinder 22 (outer cylinder dividing portion 42). For example, as shown in FIG. 7B, an arc-shaped cross-section member 71 having a shape in which a portion of the outer cylinder 22 (outer cylinder division portion 42) sandwiched by the regulation members 24 (regulation member division portion 43) is cut out, The restricting member 24 (restricting member dividing portion 43) is attached. And the member 71 having an arcuate cross section
May be rotatably attached to the column 13 by a bearing or the like.

Regulation member 24 (regulation member dividing portion 43)
Is not limited to being fixed to the outer cylinder 22 (outer cylinder dividing portion 42), and, for example, as shown in FIG. It may be attached to the outer cylinder 22 so as to be movable to a tilted position along the outer peripheral surface 22a. In this case, when the support shaft is transported, the regulating member 24 is tilted to reduce the amount of protrusion of the regulating member 24 from the outer cylinder 22, and to prevent the regulating member 24 from being damaged by hitting another member or the like. It's easy to do.

In the above case, as shown in FIG.
You may form the recessed part 82 which can accommodate the regulation member 24 in the predetermined position of the outer peripheral surface 22a. In this case, the protrusion amount of the regulating member 24 from the outer cylinder 22 can be further reduced. Further, the outer surface of the regulation member 24 may be set to be flush with the outer peripheral surface 22a of the outer cylinder 22.

The pair of regulating members (divided portion of the regulating member) is not limited to being mounted at a predetermined position of the support shaft, but may be mounted more. In this case, it is preferable that an even number of regulating members (regulating member divided portions) be attached symmetrically with respect to a plane including the center line of the column 13. For example, FIG. 8 (c)
In addition to the pair of regulating members 24, a pair of regulating members 83 may be attached to the outer cylinder 22 (outer cylinder dividing portion 42) as shown in FIG. In this case, the restriction member 83 is arranged at a position where the angle formed by both the restriction members 83 is 120 °, and the width is the outer cylinder 22.
It is preferable that the diameter of the (outer cylinder divided portion 42) is one tenth. In order to reduce the cost, it is desirable that the restriction member (restriction member dividing portion) is attached in a pair (two pieces) or two pairs (four pieces) at a predetermined position of the support shaft.

The number of the regulating members (dividing portions of the regulating members) is not limited to being evenly attached at a predetermined position of the support shaft, and may be an odd number. Of course, the odd number includes one.

.Regulating member 24 or dividing member 43 for regulating member
Is not limited to being rotated by the wind vane 26, the motor 27, or the fins 44, and may be configured to be rotated to a predetermined position by the restriction member 24 or the restriction member dividing portion 43 itself receiving wind. In this case, the regulating member 24 or the regulating member dividing portion 43 is rotated by receiving wind by itself, and is moved to a position where flow separation can be suppressed,
The number of parts can be reduced as compared with the case where a drive means is separately provided. It should be noted that the outer cylinder 22 or the outer cylinder divided portion 42 is formed so as to reduce the resistance at the time of rotation so that the outer cylinder 22 or the outer cylinder divided portion 42 can be rotated without trouble by the force of the wind received by the regulating member 24 or the regulating member divided portion 43. Is preferred.

Regulation member 24 (division member dividing portion 43)
Through the outer cylinder 22 (outer cylinder dividing portion 42) and the like.
It is not limited to being attached so as to be rotatable in the circumferential direction of
For example, the radial bearing 23 attached to the column 13
The regulating member 24 (the regulating member dividing portion 43) may be directly attached to the.

In the first embodiment, the outer cylinder 22 is
The fins are not limited to being rotated by the wind vane 26 and the motor 27. For example, a fin similar to the fin 44 is attached to the outer cylinder 22, and the fins rotate the outer cylinder 22 so as to dispose the regulating member 24 at a predetermined position. You may move.

Regulation member 24 (regulation member dividing portion 43)
Are not limited to being attached at intervals of 80 °, but may be attached with some deviation. The restriction member (restriction member split portion) is not limited to being attached to the outer cylinder 22 such that the width direction thereof is the radial direction of the outer cylinder 22, and may be attached to the outer cylinder 22 in a tilted state.

The width of the restricting member 24 (restricting member dividing portion 43) is not limited to be set to one fifth of the diameter of the outer cylinder 22, and may be longer or shorter than this. The wind turbine 19 is not limited to being directed to the windward direction by the tail fins 20. For example, the wind direction is detected by an anemoscope, and the wind turbine 19 is driven in the windward direction by a driving force of a motor controlled by a computer based on the result. You may turn to.

The outer cylinder 22 may be driven by the driving force of the tail fin 20 that directs the wind turbine 19 in the windward direction. The support shaft of the present invention is not limited to being implemented as a support for a wind turbine generator, and may be, for example, a chimney, a lightning rod support, a heat exchanger pipe, a bridge wire or support, an oil drilling support support, or an antenna. It may be applied to a pillar, a mast of a yacht, a submarine electric wire, or the like.

The technical ideas that can be understood from the above-described embodiments will be added below. (1) In the invention according to any one of claims 1 to 3, the drive means is a motor capable of driving the restriction member based on a signal from a sensor that detects a flow direction of the fluid. I have it.

(2) In the invention described in claim 2,
The number of the regulating members is an even number, and they are attached symmetrically with respect to a plane including the center line of the support shaft. (3) In the invention according to claim 1 or 2,
The restriction member is attached to a bearing attached to the support shaft.

[0054]

As described above in detail, according to the inventions of claims 1 to 7, the flow control is performed by disposing the regulating member in the separation region in response to the change in the flow direction of the fluid. It is possible to suppress and suppress vibration due to flow separation.

[Brief description of drawings]

1A is a schematic partial perspective view of a support shaft, FIG. 1B is a schematic partial vertical sectional view of the same, and FIG. 1C is a schematic horizontal sectional view.

FIG. 2 is a schematic perspective view of a wind turbine generator.

3A is a schematic cross-sectional view showing a state in which the wind direction is changed, and FIG. 3B is a schematic cross-sectional view showing the action.

FIG. 4 is a schematic perspective view of a support shaft according to a second embodiment.

5A is a schematic cross-sectional view showing a state in which the wind direction is changed, and FIG. 5B is a schematic cross-sectional view showing the action.

FIG. 6A is a schematic partial perspective view of a spindle according to another example, and FIG.
Is a schematic partial vertical cross-sectional view of a column of another example.

FIG. 7A is a schematic cross-sectional view of a column of another example,
FIG. 6B is a schematic cross-sectional view of a column of another example.

FIG. 8A is a schematic cross-sectional view of a column of another example,
(B) is a schematic cross section of the pillar of another example, (c) is a schematic cross section of the pillar of another example.

FIG. 9A is a schematic view of a vortex array generated around a cylinder arranged in a fluid, and FIG. 9B is a schematic cross-sectional view of a cylinder including a conventional regulation member.

[Explanation of symbols]

11 ... Wind power generator, 13 ... Support post as a spindle, 19 ...
Wind turbine, 22 ... Outer cylinder as cylinder member, 22a, 42a ... Outer peripheral surface as object surface, 24, 83 ... Restricting member, 26 ...
Wind vane, which constitutes the driving means, 27 ... Similarly, motor, 27
a ... Similarly drive gear, 28 ... Similarly gear, 42 ... Outer cylinder divided portion, 43 ... Regulating member divided portion, 44 ... Fins as driving means.

Claims (7)

[Claims] 1. A regulation which is arranged in a separation region between a steady flow region and a surface of an object, extends from the surface of the object to the separation region, and can suppress flow separation without reaching the steady flow region. A support shaft comprising a drive means capable of driving a member in a circumferential direction in response to a change in the flow direction of a fluid. 2. The support shaft according to claim 1, wherein at least two regulating members are provided. 3. The support shaft according to claim 1, wherein the regulating member is attached to a tubular member that is rotatably attached to the support shaft. 4. The spindle according to claim 1, wherein the drive means is a fin capable of driving the regulation member by receiving the force of the fluid. . 5. The support according to any one of claims 1 to 4, wherein the regulating member itself also serves as the driving means and is rotatable by receiving the force of the fluid. axis. 6. The regulating member is distributed at a plurality of locations in the axial direction of the support shaft, and is provided so as to be rotatable in the circumferential direction independently of each other.
~ The support shaft according to claim 5. 7. A pillar for supporting a wind turbine according to claim 1.
A wind turbine generator using the support shaft according to claim 6.