JP2005226475A - Wind power generation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify assembly work by making a blade of a windmill easy to be attached and to increase power generation capacity by making the windmill efficiently rotate even with a gentle wind. <P>SOLUTION: This wind power generation device is provided with a windmill having a plurality of blades bent and attached to a rotary shaft, a generator connected to the rotary shaft of the windmill and generating electric power, and a cover covering the windmill in such a manner of forming a flow passage guiding wind toward the blade. A pair of fixtures fixed to the rotary shaft with a predetermined space for fixing the blade on the rotary shaft. One an end part of the blade is fixed on one of the pair of fixtures and another end part of the blade is fixed on another of the pair of fixtures. A twisted surface inclined at same angle as twist angle for fixing the blade at a predetermined twist angle and contacting one end part and another end part of the blade is formed on the pair of fixtures according to the number of blades. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wind turbine generator, and more particularly, to a wind turbine generator including a wind turbine using twisted blades.

In a general windmill used for a wind turbine generator, a plurality of blades called blades are provided with a size capable of generating the required power. Since the size is increased, the installation location is limited. Here, if twisted blades are used, wind power can be efficiently acted as rotational force, so that the size of the wind direction is smaller than that of a general wind turbine, but the same rotation as a general wind turbine. Wind turbines that can be expected are being developed. (For example, refer nonpatent literatures 1 and 2.).
Kojima, “Development of a twisted arc wing type horizontal axis wind turbine”, Solar Energy, Japan Solar Energy Society, May 1996, Vol. 22, No. 3, p. 25-31 Kojima, Kishimura, "Study on twisted arc wing horizontal axis wind turbine", Solar Energy, Japan Solar Energy Society, September 1997, Vol. 23, No. 5, p. 70-76

However, in the wind turbine using the above twisted blades, the twist angle of the blades must be set to a predetermined value in order to obtain a suitable rotational speed. However, the operator adjusts the twist angle one by one when assembling the wind turbine. However, it was necessary to attach a blade to the rotating shaft of the windmill, and it took a very long time to assemble.
Moreover, in order to efficiently rotate the windmill using the twisted blade, it is preferable that the wind direction is a wind along the rotation axis direction. It was difficult to obtain wind along the axial direction, and as a result, it was difficult for the windmill to rotate efficiently.

  An object of the present invention is to facilitate the assembly work by making it easy to attach the blade. Moreover, even if it is a weak wind, it is improving a power generation capability by rotating a windmill efficiently.

The invention described in claim 1
A windmill mounted such that a plurality of blades are curved with respect to the rotation axis;
A generator connected to the rotating shaft of the windmill to generate power by transmitting the power of the windmill;
A cover that covers the windmill along the axial direction of the rotating shaft so as to form a flow path for guiding the wind toward the blade;
The windmill is
In order to fix the blade to the rotary shaft, a pair of fixtures fixed to the rotary shaft at a predetermined interval,
One end of the blade is fixed to one fixing tool of the pair of fixing tools, and the other end of the blade is fixed to the other fixing tool,
The pair of fixtures has a twist surface that is inclined at the same angle as the twist angle so that the blade is fixed at a predetermined twist angle, and a twist surface that contacts one end and the other end of the blade is the number of the blades. It is characterized by being formed corresponding to.

According to the first aspect of the present invention, since the torsion surfaces inclined at the same angle as the torsion angle are formed on the pair of fixtures, when assembling the windmill, only the end of the blade is brought into close contact with the torsion surface. Thus, the blade can be twisted at a predetermined twist angle and attached to the rotating shaft. That is, by omitting the trouble of adjusting the twist angle, the blade can be easily attached, and the assembling work can be simplified.
In addition, the wind turbine having the above-described twisted blade can obtain the same rotational speed even if the wind turbine is smaller in size with respect to the wind direction than a general wind turbine, so that the wind power generator itself can be downsized. . Generally, the wind power increases in proportion to the elevation, but the invention according to claim 1 has the same level at a position lower than that in the case of generating power using a conventional general windmill. Power generation is possible. Therefore, the installation location can be lowered and the installation area can be reduced as compared with the conventional wind power generator using a general windmill, and as a result, the safety at the time of installation can be improved.
Moreover, since the windmill is covered with the cover, it is possible to prevent a person from being involved in the rotation. Moreover, since the wind is guided along the axial direction by the cover, the wind turbine can be efficiently rotated to increase the power generation capacity.

The invention described in claim 2 is the wind turbine generator according to claim 1,
The rotating shaft is arranged along the vertical direction.

  Here, in a windmill having a twisted blade, the rotation axis is longer than the outer shape of the blade. For this reason, the area projected on the horizontal plane is smaller in the windmill arranged along the vertical direction than the windmill arranged along the horizontal direction, and the installation area can be easily reduced. Therefore, if the rotation axis is arranged along the vertical direction as in the invention described in claim 2, the installation area can be reduced.

The wind turbine generator according to claim 3 is the wind turbine generator according to claim 1,
A support portion is provided that supports the cover and the windmill rotatably so that the rotation shaft is along a horizontal direction.

  According to the third aspect of the invention, since the support portion rotatably supports the cover and the windmill, even if the wind direction changes, the direction of the windmill and the cover can be changed accordingly.

The invention according to claim 4 is the wind turbine generator according to claim 1,
The drive shaft of the generator is provided with a speed increasing device for increasing the rotation of the windmill.

  According to the fourth aspect of the present invention, since the speed increasing device for increasing the rotation of the windmill is provided on the drive shaft of the power generator, efficient power generation is possible.

The invention according to claim 5 is the wind turbine generator according to claim 1,
A rotary joint for connecting the rotary shaft of the windmill and the drive shaft of the generator;
The rotary joint is
A hollow elastic part that expands and contracts in the axial direction;
A base portion that is provided on one end surface of the extendable portion and rotatably supports the drive shaft so that a distal end portion of the drive shaft is located inside the extendable portion;
Provided on the other end surface of the expansion / contraction part, while rotating in conjunction with the rotation of the rotation shaft, the rotation is transmitted to the expansion / contraction part, and is attached to and detached from the tip of the drive shaft supported by the base part With a flexible connecting part,
When the telescopic part rotates in conjunction with the rotation transmitted from the rotating shaft through the interlocking part, it contracts by the centrifugal force due to the rotation,
The connecting portion moves relative to the base portion in conjunction with the deformation of the expansion / contraction portion, and is connected to the tip end portion of the drive shaft when the contraction amount of the expansion / contraction portion is a predetermined amount or more. If the amount of contraction of the extendable portion is less than a predetermined amount, the drive shaft is not connected to the tip end portion.

  According to the fifth aspect of the present invention, when the amount of contraction of the extendable portion is equal to or greater than a predetermined amount, the connecting portion is connected to the tip end portion of the drive shaft, and when the amount is less than the predetermined amount, the connecting portion is Since the tip end of the drive shaft is not connected, the rotating shaft of the windmill and the drive shaft of the generator can be connected or disconnected. That is, when in the disconnected state, the load at the start of rotation is reduced, and the windmill can be rotated even with a weak wind. And if the number of rotations of the rotating shaft increases and the expansion / contraction part is contracted by a predetermined amount or more, the connecting part and the driving shaft are connected and a load is applied, but at this time, an inertial force due to the rotation acts. In addition, the drive shaft can be smoothly rotated. Therefore, power generation is possible even with weak wind power.

The invention described in claim 6 is the wind turbine generator according to claim 5,
A guide member that guides wind toward the blade is rotatably provided above or below the blade on the rotation shaft.
In the portion of the cover facing the guide member, a plurality of openings for allowing wind to enter the cover are formed along the circumferential direction of the rotating shaft.

  According to the sixth aspect of the present invention, since the plurality of openings are formed in the cover along the circumferential direction of the rotating shaft, even if the cover and the windmill are arranged so that the rotating shaft is along the vertical direction. Any wind direction can enter the cover. Since the guide member is rotatable, the direction is changed by the wind that has entered the inside of the cover, so that the wind can always be directed toward the blade.

According to the present invention, at the time of assembling the wind turbine, the blade can be attached to the rotating shaft by twisting the blade at a predetermined twist angle simply by bringing the end of the blade into close contact with the torsion surface. That is, by omitting the trouble of adjusting the twist angle, the blade can be easily attached, and the assembling work can be simplified. Thus, if the assembly work of a windmill is simplified, the assembly work of the wind power generator in which this windmill is installed can also be simplified, and it becomes simple and inexpensive.
Further, by guiding the wind along the axial direction of the rotating shaft and rotating the windmill even in a weak wind, the windmill can be efficiently rotated and the power generation capacity can be increased.

  The wind power generator of this embodiment is demonstrated with reference to FIGS. FIG. 1 is a front view showing the wind power generator 2.

  The wind power generator 2 includes a cylindrical base 21. Inside the base 21, a generator 22, a storage battery 23 for storing the power generated by the generator 22, and the power stored in the storage battery 23 are supplied to each drive unit to control the operation of each drive unit. The control device 24 is stored. A wind turbine 5 is disposed above the base 21, and a drive shaft 221 of the generator 22 projects upward from the center of the upper surface of the base 21. A rotary joint 223 for transmitting the power of the wind turbine 5 to the generator 22 is connected to the drive shaft 221 via a speed increaser 222. Thus, since the speed-up gear 222 which speeds up rotation of the windmill 5 is provided, efficiency improvement of electric power generation can be achieved.

  2A and 2B are explanatory views showing a schematic configuration of the wind turbine 5, FIG. 2A is a side view, and FIG. 2B is a top view. As shown in FIG. 2, the wind turbine 5 includes a rotating shaft 51 connected to the rotary joint 223, a pair of fixing tools 52 a and 52 b fixed to the rotating shaft 51 at a predetermined interval, and a pair of fixing tools. 52a and 52b, one end is fixed to one fixing tool 52a and the other end is fixed to the other fixing tool 52b, and is attached to the rotating shaft 51 so as to be curved. A blade 53 is provided.

3A and 3B are explanatory views showing a schematic configuration of the fixtures 52a and 52b. FIG. 3A is a top view and FIG. 2B is a side view. As shown in FIG. 3, a through-hole 521 is formed in the center of the fixtures 52a and 52b, through which the rotary shaft 51 is passed and fixed. A plurality of torsion surfaces 522 inclined at a predetermined angle α with respect to the axial direction of the through-hole 521 are formed around the through-hole 521 of the fixtures 52 a and 52 b corresponding to the number of blades 53. . When the end of the blade 53 is brought into contact with the twisted surface 522, the blade 53 is twisted at a suitable twist angle as shown in FIG. If the screw hole 523 provided in the torsion surface 522 and the hole provided at the end of the blade 53 are screwed together, the blade 53 is fixed to the fixtures 52a and 52b with a suitable twist angle. It can be done.
The optimum value of the twist angle of the blade 53 varies depending on the distance between the pair of fixing tools 52a and 52b and the number, shape, size, etc. of the blade 53. It is necessary to find the optimal twist angle. Then, the angle α of the torsion surface 522 must be set so as to correspond to the derived optimum twist angle.

  The rotary joint 223 releases the connection between the drive shaft 221 and the rotary shaft 51 of the generator 22 when the rotational speed of the rotary shaft 51 of the wind turbine 5 is less than a predetermined value, and the rotational speed of the rotary shaft 51 is equal to or higher than the predetermined value. In this case, the drive shaft 221 and the rotary shaft 51 are connected. 4A and 4B are a cross-sectional view (a) and a vertical cross-sectional view (b) showing the rotary joint 223. As shown in FIG. 4, the rotary joint 223 is provided with a hollow stretchable portion 93 that stretches in the axial direction. The expansion / contraction part 93 contracts when a predetermined load is applied, and expands and returns to the initial state when the load is removed. Four weights 94 are fixed to the outer periphery of the stretchable part 93. A base 92 having a built-in bearing 91 is provided on the lower end surface (one end surface) of the expandable portion 93. The bearing 91 of the base portion 92 is configured to rotatably support the drive shaft 221 such that the distal end portion of the drive shaft 221 of the generator 22 is positioned inside the telescopic portion 93. On the other hand, while rotating in conjunction with the rotation of the rotating shaft 51 of the wind turbine 5, the rotation is transmitted to the expansion / contraction unit 93 and the drive supported by the base unit 92 on the upper end surface (the other end surface) of the expansion / contraction unit 93. A detachable connecting portion 95 is provided at the tip of the shaft 221.

The connecting portion 95 is provided with a through portion 951 that is in contact with the upper surface of the telescopic portion 93 and through which the rotary shaft 51 is rotatably passed. An attachment / detachment portion 952 whose attachment / detachment state with respect to the drive shaft 221 changes depending on the extension / contraction state of the extension / contraction portion 93 is fixed to the lower surface of the penetrating portion 951. When the telescopic portion 93 is extended, the detachable portion 952 is separated from the drive shaft 221 because it is relatively separated from the base portion 92. On the other hand, when the telescopic part 93 is contracted, the detachable part 952 is close to the base part and is connected to the drive shaft 221. Here, if the contraction amount of the expansion / contraction part 93 is less than a predetermined amount, the attachment / detachment part 952 and the drive shaft 221 are not connected, and if the contraction amount is equal to or greater than the predetermined amount, the attachment / detachment part 952 and the drive shaft 221 Is connected.
Further, a groove 954 extending in the axial direction is formed in the attaching / detaching portion 952. Inside the detachable portion 952, there is provided a rotation fixed shaft 953 that is fixed to the rotation shaft 51 that penetrates the through portion 951. A pin 955 extending laterally is fixed to the rotation fixed shaft 953, and this pin 955 protrudes from the groove 954 of the attaching / detaching portion 952 and is engaged with the expansion / contraction portion 93. That is, when the rotation fixed shaft 953 rotates with the rotation of the rotation shaft 51, the rotational force is transmitted to the expansion / contraction part 93 via the pin 955, and the expansion / contraction part 93 and the weight 94 also rotate in conjunction with each other. Yes. The centrifugal force based on the rotation of the extension / contraction part 93 and the weight 94 acts to contract in the axial direction while acting as a force for deforming the extension / contraction part 93 outward. Here, in order to connect the attaching / detaching portion 952 and the drive shaft 221, the contraction amount of the expansion / contraction portion 93 must be equal to or greater than a predetermined amount. Therefore, at least the centrifugal force that causes the contraction amount to be a predetermined amount must be applied to the expansion / contraction portion 93. I must. The centrifugal force varies depending on the number of rotations of the rotation shaft 51, the weight of the expansion / contraction part 93, the weight of the weight 94, etc., but at least when the rotation number of the rotation shaft 51 becomes about 100 rpm or more, It is preferable to set the weight of the stretchable part 93 and the weight 94 so that the amount of shrinkage becomes a predetermined amount. Further, since the rotational speed of the rotating shaft 51 depends on the wind speed, the number and size of the blades 53 are set so that the rotational speed exceeds about 100 rpm when the wind speed is about 1.6 m / s or more. It is preferable to set the shape and the like.
Through these series of operations, the drive shaft 221 and the rotary shaft 51 can be connected and disconnected.

As shown in FIG. 1, a guide member 54 that guides wind toward the blade 53 is rotatably provided below the blade 53 of the rotating shaft 51. FIG. 5 is a cross-sectional view showing the AA cross section in FIG. 1. As shown in FIG. 5, the guide member 54 includes a disk-shaped bottom plate 541 that is rotatably fixed to the rotary shaft 51, and a bottom plate. A guide plate 542 extending upward from the semi-periphery of 541 and a wind direction plate 543 extending downward from the lower surface of the guide plate 542 are provided. Since the wind direction plate 543 is arranged on a straight line connecting the center of the guide plate 542 and the rotation shaft 51, when the wind strikes the wind direction plate 543, the bottom plate 541 is rotated by the wind pressure, and the inner periphery of the guide plate 542 The face faces the wind. That is, the guide member 54 rotates in accordance with the wind direction regardless of the wind direction, and guides the wind toward the blade 53 while keeping the wind along the upper surface of the bottom plate 541 and the inner peripheral surface of the guide plate 542. It is like that.
Above the blade 53, a bearing (not shown) that rotatably supports the upper end of the rotating shaft 51 is provided.

  As shown in FIG. 1, a cover 6 that covers the windmill 5 is disposed on the periphery of the upper surface of the base 21 along the axial direction of the rotation shaft 51 so as to have a cylindrical shape. In the portion of the cover 6 facing the guide member 54, a plurality of openings 61 for allowing the wind to enter the cover 6 are formed along the circumferential direction of the rotating shaft 51. 6 can enter the inside. In this way, a wind flow path is formed inside the cover 6 so that the wind is guided from the opening 61 and then guided toward the blade 53 and then discharged from above.

Above the wind power generator 2, an electric light display 3 is installed. The indicator 3 is fixed to the upper end portion of the cover 6, and a cavity 31 is provided along the vertical direction so that the wind passing through the cover 6 escapes upward. On the outer peripheral surface of the display 3, a plurality of light-emitting panels 32 that perform various displays are provided. The lightning panel 32 is electrically connected to the control device 24, and the display content is controlled by the control device 24.
A plurality of solar panels 33 that generate power by sunlight are arranged on the upper peripheral surface of the display 3. The solar panel 33 is connected to the storage battery 23, and the electric power generated by the solar panel 33 is stored in the storage battery 23. That is, since it is possible to generate power using the wind power generator 2 and the solar panel 33 in combination, stable power generation is possible over a long period of time.

Next, the operation of this embodiment will be described.
First, the assembly procedure of the wind turbine 5 will be described with reference to FIG. 2 and FIG. 3. The operator passes the rotating shaft 51 through the through holes 521 of the pair of fixing tools 52a and 52b, and the pair of fixing tools 52a and 52b. After the interval is set to a predetermined interval, the pair of fixtures 52 a and 52 b are attached to the rotating shaft 51. When the fixtures 52a and 52b are fixed to the rotary shaft 51, the operator attaches the one end of the blade 53 to the torsion surface 522 of the one fixture 52a and screws the other end of the blade 53. The fixing tool 52b is screwed in close contact with the torsion surface 522. If the above steps are repeated for all the blades 53, the blade 53 is fixed to the rotating shaft 51 with the predetermined twist angle as shown in FIG.

  Next, the operation of the wind power generator 2 will be described with reference to FIG. 1. When the wind enters from the opening 61, the guide member 54 rotates according to the wind direction and guides the wind toward the blade 53. When wind strikes the blade 53, the blade 53 and the rotating shaft 51 rotate. Here, if the rotational speed of the rotating shaft 51 is less than about 100 rpm, the amount of contraction of the expansion / contraction portion 93 is less than a predetermined amount, so that the rotary joint 223 releases the connection between the rotating shaft 51 and the drive shaft 221. Therefore, the load at the start of rotation can be reduced, and the windmill 5 can be rotated with weak wind power. And when the rotation speed of the rotating shaft 51 exceeds about 100 rpm, the shrinkage amount of the expansion-contraction part 93 will become more than predetermined amount, and the rotating shaft 51 and the drive shaft 221 will be connected. Although a load is applied at the time of this connection, the drive shaft 221 can be smoothly rotated because of the inertial force due to the rotation.

When the drive shaft 221 rotates, the generator 22 is activated and power generation is started. The electric power obtained by this power generation is supplied to the storage battery 23 and stored. Moreover, if the solar panel 33 is irradiated with sunlight, the electric power generated by the solar panel 33 is supplied to the storage battery 23 and stored.
The display device 3 displays various display contents on the lightning panel 32 when the power and the control signal stored in the storage battery 23 are supplied from the control device 24.

As described above, according to the wind turbine generator 2 of the present embodiment, since the windmill 5 having the above-described twisted blade 53 is used as a windmill, the size with respect to the wind direction is smaller than that of a general windmill. Can also obtain the same number of rotations, and the wind power generator 2 itself can be downsized. In general, the wind power increases in proportion to the elevation, but the wind power generator 2 of the present embodiment is the same at a lower position than when generating power using a conventional wind turbine. It is possible to generate electricity to the extent. Therefore, the installation location can be lowered and the installation area can be reduced as compared with the conventional wind power generator using a general windmill, and as a result, the safety at the time of installation can be improved.
Furthermore, since the windmill 5 is covered with the cover 6, it can prevent that a person is caught in rotation. Further, since the wind passage is formed in the cover 6, it is possible to prevent the wind from being blocked by the cover 6.
The blade 53 itself is covered with the cover 6, and furthermore, since both ends of the blade 53 are fixed to the pair of fixtures 52a and 52b, the blade 53 can be used even under a strong wind such as a typhoon. Prevents damage.
Further, since the fixing members 52a and 52b of the windmill 5 are formed with a twisted surface 522 inclined at the same angle as the twist angle, the end of the blade 53 is brought into close contact with the twisted surface 522 when the windmill 5 is assembled. It is possible to attach the blade 53 to the rotary shaft 51 by simply twisting the blade 53 at a predetermined twist angle. That is, by omitting the trouble of adjusting the twist angle, the blade 53 can be easily attached, and the assembling work can be simplified. Thus, if the windmill 5 can be easily assembled, it is possible to simplify the assembling work of the wind power generator 2 itself, and further, it is inexpensive because it is simple.
Further, as described above, by guiding the wind along the axial direction of the rotating shaft 51 and rotating the windmill even in a weak wind, the windmill 5 can be efficiently rotated and the power generation capacity can be increased. it can.
In the wind turbine 5 having the twisted blade 53, the rotation shaft 51 is longer than the outer shape of the blade 53. For this reason, the area projected on the horizontal plane is smaller in the windmill 5 arranged along the vertical direction than the windmill 5 arranged along the horizontal direction, thereby reducing the installation area. It's easy to do. Therefore, if the rotating shaft 51 is arranged along the vertical direction as in the wind power generator 2 of the present embodiment, the installation area can be reduced.

Of course, the present invention is not limited to the above-described embodiment and can be modified as appropriate.
For example, in the present embodiment, the case where the rotating shaft 51 is along the vertical direction has been described as an example, but the inclination of the rotating shaft 51 may be arbitrary, and may be configured along the horizontal direction, for example. Below, the case where the rotating shaft 51 is made to follow a horizontal direction is demonstrated with reference to FIG. In addition, in the following description, the same code | symbol is attached | subjected in the part same as the wind power generator 2 in the said embodiment, and the description is abbreviate | omitted.

As shown in FIG. 6, the wind turbine 5, the rotary joint 223, the speed increaser 222, and the generator 22 are arranged in the wind power generator 2 </ b> A so that the rotation shaft 51 and the drive shaft 221 are along the horizontal direction. The wind power generator 2 </ b> A is provided with a cylindrical cover 6 </ b> A that covers the wind turbine 5, the rotary joint 223, the speed increaser 222, and the power generator 22 along the axial direction of the rotary shaft 51.
A frame (not shown) that supports the wind turbine 5, the rotary joint 223, the speed increaser 222, and the generator 22 is provided inside the cover 6 </ b> A. A plurality of wind direction blades 65 are provided at one end of the outer surface of the cover 6A.

  In addition, the wind power generator 2A is provided with a support portion 8 that is fixed to a building or the like and supports the cover 6A in a rotatable manner. The wind turbine 5, the rotary joint 223, the speed increaser 222, the generator 22 and the cover 6A rotate according to the wind direction, and the rotation shaft 51 follows the wind direction. Thus, the wind always passes through the cover 6A to rotate the blade 53 regardless of the wind direction.

It is a front view showing the wind power generator of this embodiment. It is explanatory drawing showing the windmill with which the wind power generator of FIG. 1 is equipped. It is explanatory drawing showing the fixing tool with which the windmill of FIG. 2 is equipped. It is a front view showing the rotary joint with which the wind power generator of FIG. 1 is equipped. It is sectional drawing showing the AA cross section in FIG. It is a front view showing the modification of the wind power generator of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Wind power generator 3 Indicator 5 Windmill 6 Cover 22 Generator 51 Rotating shaft 52a, 52b Fixing tool 53 Blade 54 Guide member 61 Opening 92 Base part 93 Expansion / contraction part 95 Connection part 221 Drive shaft 222 Speed increaser 223 Rotating joint 522 Twist surface

Claims (6)

A windmill mounted such that a plurality of blades are curved with respect to the rotation axis;
A generator connected to the rotating shaft of the windmill to generate power by transmitting the power of the windmill;
A cover that covers the windmill along the axial direction of the rotating shaft so as to form a flow path for guiding the wind toward the blade;
The windmill is
In order to fix the blade to the rotary shaft, a pair of fixtures fixed to the rotary shaft at a predetermined interval,
One end of the blade is fixed to one fixing tool of the pair of fixing tools, and the other end of the blade is fixed to the other fixing tool,
The pair of fixtures has a twist surface that is inclined at the same angle as the twist angle so that the blade is fixed at a predetermined twist angle, and a twist surface that contacts one end and the other end of the blade is the number of the blades. The wind power generator characterized by being formed corresponding to. The wind turbine generator according to claim 1,
A wind turbine generator, wherein the rotating shaft is arranged along a vertical direction. The wind turbine generator according to claim 1,
A wind power generator comprising: a support portion that rotatably supports the cover and the windmill so that the rotation shaft is in a horizontal direction. The wind turbine generator according to claim 1,
A wind turbine generator having a speed increasing device for increasing the rotation speed of the wind turbine is provided on a drive shaft of the power generator. The wind turbine generator according to claim 1,
A rotary joint for connecting the rotary shaft of the windmill and the drive shaft of the generator;
The rotary joint is
A hollow elastic part that expands and contracts in the axial direction;
A base portion that is provided on one end surface of the extendable portion and rotatably supports the drive shaft so that a distal end portion of the drive shaft is located inside the extendable portion;
Provided on the other end surface of the expansion / contraction part, while rotating in conjunction with the rotation of the rotation shaft, the rotation is transmitted to the expansion / contraction part, and is attached to and detached from the tip of the drive shaft supported by the base part With a flexible connecting part,
When the telescopic part rotates in conjunction with the rotation transmitted from the rotating shaft through the interlocking part, it contracts by the centrifugal force due to the rotation,
The connecting portion moves relative to the base portion in conjunction with the deformation of the expansion / contraction portion, and is connected to the tip end portion of the drive shaft when the contraction amount of the expansion / contraction portion is a predetermined amount or more. The wind power generator is characterized in that when the amount of contraction of the extendable portion is less than a predetermined amount, the wind power generator is not connected to the tip end portion of the drive shaft. The wind turbine generator according to claim 5,
A guide member that guides wind toward the blade is rotatably provided above or below the blade on the rotation shaft.
The wind power generator according to claim 1, wherein a plurality of openings for allowing wind to enter the cover are formed along a circumferential direction of the rotating shaft at a portion of the cover facing the guide member.

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