JP2010156305A - Windmill for wind power generation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a windmill for wind power generation of high power generation efficiency, capable of starting up a blade even in a very weak wind, to obtain an angular moment, by attaching wind collecting support member inside a streamline-shape profile blade, capable of rotating the windmill with satisfactory power generation efficiency in a wide wind velocity area, and having a high strength against a strong wind. <P>SOLUTION: This windmill has a rotary shaft provided in an axially upper side of a rotary bearing device, support rods projected radially, the blades of a rotary vane attached to oppose the rotary shaft to a reverse face, and a wing collecting support member, the blade is constituted to cut out the reverse face opposed to the rotary shaft while remaining a rotation-advance-wise tip, and the wing collecting support member has a pair of wind collecting walls projected from a surface reverse face toward the rotary shaft, on the reverse face of a surface opposed to the cut-out reverse face. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a vertical axis wind turbine for wind power generation in a wind turbine generator.

In general, a wind turbine for wind power generation used in a wind turbine generator includes a horizontal axis type wind turbine in which a rotation axis represented by a propeller type wind turbine is horizontal to the wind, and a rotation axis perpendicular to the wind. A vertical axis type windmill is known.
Of these, the latter vertical axis type wind turbines are also equipped with a “drag type” that rotates the wind turbine with the drag generated by the blades, such as the paddle type and Savonius type, and the blades such as the Darius type and gyromill type It is known as a “lift type” that rotates a windmill with the generated lift.
The former uses the drag generated in the blade to rotate the windmill, whereas the latter rotates the windmill by the lift generated in the blade (see Patent Document 1).

Here, in the case of the “drag type” in the vertical axis type wind turbine, when the peripheral speed ratio (blade blade tip speed / wind speed) becomes 1, no moment is generated to turn the wind turbine further, and the wind speed increases. However, the number of rotations beyond that cannot be obtained, and there is a problem that power generation efficiency is poor.
In the case of the latter “lift type”, even if the peripheral speed ratio (blade blade tip speed / wind speed) is 1 or more, the wind turbine can be efficiently rotated and the power generation efficiency is improved. On the other hand, when the peripheral speed ratio (blade blade tip speed / wind speed) is 1 or less, there is a problem that the moment of rotating the windmill is small and it is difficult to start the windmill from a stopped state.
For this reason, a wind turbine blade is disclosed in which a wind turbine blade is formed into a streamlined airfoil and a notch is provided in the rear edge of the lower surface to generate air resistance and lift, thereby generating a rotational moment (patent) Reference 1).

JP 2004-108330 A

However, the conventional wind power generator blades are difficult to start with a slight wind of about 0.4 m / s, for example, and a sufficient rotational moment cannot be obtained. There was a problem in the installation conditions that it could not be used in places with weak winds such as parts.
Thus, the present invention has been made by adding further thought and improvement to the above-described various proposals, and is an improvement of a lift type vertical axis wind turbine.
Specifically, in order to generate “drag” to the streamlined blade type blade, a wind collection support member is attached to the inside of the blade so that the blade can be activated even with a slight wind of about 0.4 m / s, and the rotational moment It is an object of the present invention to provide a wind turbine for wind power generation with high strength capable of rotating the wind turbine with high power generation efficiency in a wider range of wind speed than before, having high power generation efficiency and withstanding strong wind.

A wind turbine for wind power generation according to the present invention includes a rotation shaft portion provided in communication with the rotation receiving device above the rotation receiving device in the axial direction;
A plurality of support rods projecting radially from the rotating shaft;
A blade of a rotary blade attached to the tip of the plurality of support rods so that the rotary shaft portion and the back surface portion face each other;
A wind collecting support member attached to the back surface of the blade of the rotor;
Have
The blade of the rotor blade is cut away with the back surface facing the rotating shaft part leaving a tip in the direction of rotation,
The air collecting support member extends in a substantially C shape from the front end side to the rear end side in the rotation traveling direction on the back surface of the front surface portion facing the cut back surface portion,
It has a pair of air collecting walls projecting from the back surface of the front surface portion toward the rotating shaft portion,
It is characterized by
Or
A rotating shaft portion provided in communication with the rotation receiving device above the rotation receiving device in the axial direction;
A plurality of support rods projecting radially from the rotating shaft;
A blade of a rotary blade attached to the plurality of support rod tips so that the rotary shaft portion and the back surface portion face each other;
A wind collecting support member attached to the back surface of the blade of the rotor;
Have
The blade of the rotor blade has a back surface facing the rotating shaft portion cut out in a substantially C shape from the front end side to the rear end side in the rotation traveling direction,
The wind collecting support member is formed with a wind collecting wall that closes the cutout portion in the cutout portion that forms a C shape on the back surface of the cutout blade.
It is characterized by this.

In the wind turbine for wind power generation according to the present invention, the wind turbine is provided by a wind breeze in a low wind speed region that has been difficult to start by providing a wind collecting support member that generates “drag” inside the blade of the rotor blade. A wind turbine with high strength that can start up, obtain a rotational moment, can rotate more efficiently in a wider range of wind speed than before, can provide wind turbines with high power generation efficiency, and can withstand strong winds. There is an excellent effect that it can be provided.

It is a perspective view which shows the external appearance of the windmill for wind power generation which concerns on this invention. FIG. 2 is an explanatory diagram of an external appearance from the front direction of the wind turbine for wind power generation illustrated in FIG. 1. It is explanatory drawing the external appearance from the plane direction of the windmill for wind power generation shown in FIG. It is a figure which shows the attachment structure of the braid | blade and wind collection support member in this invention (the 1). It is a figure which shows the attachment structure of the braid | blade and wind collection support member in this invention (the 2). It is (a) side view, (b) front view, and (c) perspective view showing the structure of the air collecting support member in the present invention. FIG. 5 is a reference diagram for explaining lift force, drag force, and force drawn by a shaft during rotation of a blade in the present invention (for example, wind at an angle of attack α). It is a reference figure explaining the lift force at the time of rotation in the high wind speed region of a blade in the present invention, drag, and the force pulled by a shaft.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows the appearance of a wind turbine 1 for wind power generation according to the present invention.
The wind turbine 1 for wind power generation is a so-called vertical axis type wind turbine for generating power by using the rotation of a blade as a rotating blade and transmitting the rotational force to the generator 4.
First, in the wind turbine 1 for wind power generation according to the present invention, a rotating shaft portion 3 is provided above the rotation receiving device 2 so as to communicate with the rotation receiving device 2. Although the detailed shape of the rotating shaft 3 is not limited at all, it is usually provided so as to communicate with the upper extension of the rotation receiving device 2 and is configured in a columnar shape or a cylindrical shape. Yes.

As can be understood from FIG. 1 and FIG. 2, a generator 4 having a substantially cylindrical shape is connected to the rotation receiving device 2, and the rotational force of the rotating blades is rotated by wind power. It is assumed that power is generated by being transmitted to the generator 4 side via the rotating shaft portion 3.

Next, the code | symbol 5 shows a support rod. A plurality of the support rods 5 are provided so as to project radially from the rotating shaft portion 3. Here, the detailed shape, quantity and material of the support rod 5 are not limited at all. In the present embodiment, the rotary shaft 3 is configured to project radially from two locations at the upper and lower ends of the rotary shaft 3.

As can be understood from FIGS. 1 to 3, the support rod 5 extends from the substantially central portion of the support rod 5 in the width direction in the longitudinal direction of the support rod 5 on the front surface of the rotation shaft portion 3 in the rotational direction. Notched surfaces 6 and 6 are formed which are formed in an inclined surface toward the upper and lower ends. The cut surface 6 is provided to reduce the air resistance of the support rod 5 when the wind turbine 1 for wind power generation is rotating.

The support rod 5 is preferably formed of an aluminum alloy so as to maintain a light weight and a constant strength.

Reference numeral 7 denotes a blade of a rotor blade. The blade 7 is attached to the front end side of the support rod 5 such that the rotary shaft portion 3 and the back surface portion 8 of the blade 7 body face each other. The detailed shape, quantity, attachment method and material of the blade 7 are not limited at all. In the present embodiment, four blades 7, 7... Are arranged in parallel to the rotation shaft portion 3 along the same radial circumferential direction in a horizontal plane orthogonal to the rotation shaft portion 3.

In this embodiment, the outer skin of the blade 7 is made of a single-layer aluminum alloy or plastic (including polycarbonate and FRP) in order to maintain light weight and constant strength, as shown in FIGS. It is formed into a streamlined airfoil by bending a thin plate material made of such a material.

In the blade 7 shown in FIG. 4, there is shown a blade 7 of the type in which the back surface portion 8 facing the rotating shaft portion 3 is formed by cutting away the tip portion 17 in the rotation traveling direction.

In the blade 7 shown in FIG. 5, the connection portion of the back surface portion 8 facing the rotation shaft portion 3 with the front end of the support rod 5 is substantially C-shaped from the front end side to the rear end side in the rotation traveling direction. A blade 7 of the type in which a notch 9 (not shown) is formed is shown. In FIG. 5, wind collecting support members 10, which will be described later, are formed with air collecting walls 13 and 13 for closing the notched portion 9 in the notched portion 9 having a letter C shape in the notched back surface portion 8. Things are shown.

Here, as described above, in the blade 7 of a type formed by bending a thin plate material into a streamlined airfoil, the upper and lower surfaces of the blade 7 are covered with cap members 17, 17. It does not matter (see FIG. 5). This is because the durability of the blade is enhanced by closing the opened upper and lower surfaces. As described above, the detailed shape of the blade 7 is not limited at all.

Further, as shown in FIGS. 1 to 5, a support material 11 having a substantially U-shaped cross section is attached to the inner surface of the blade 7 in the height direction of the blade 7. The support material 11 is applied to prevent deformation and strength of the blade 7.

Further, as shown in FIGS. 1 to 5, the tip of the support rod 5 is connected to the support member 11 with a connecting bracket or the like, and the blade 7 is attached to the support rod 5. The detailed shape, quantity, attachment method and material of the support member 11 are not limited at all.

Next, reference numeral 10 shown in FIGS. 1 to 5 denotes a wind collecting support member. As shown in FIG. 6, the air collecting support member 10 has a pair of air collecting walls 13 and 13 and a mounting surface portion 14 that rise in a vertical direction from the rear end of the front surface portion 12 having a substantially trapezoidal shape. It is integrally formed. As can be understood from the figure, the rear surface of the front surface portion 12 having a substantially trapezoidal shape is formed with an end portion on the opposite side of the mounting surface portion 14 being opened.

Further, as understood from FIG. 6, the shape of the pair of air collecting walls 13 is such that the end of the surface portion 12 extending in the direction perpendicular to the mounting surface 14 extends from one end of the mounting surface 14. It is formed in an inclined shape over the part. That is, as shown in FIG. 6, the air collecting walls 13, 13 are formed in a substantially triangular shape.

The wind collecting support member 10 is attached to the outer skin of the back surface of the main body of the blade 7 that faces the rotating shaft 3. Specifically, as shown in FIGS. 1, 2, 4, and 5, the attachment surface portion 14 is provided between the support rod 5 and the support material 11 at the connection position of the support rod 5 on the outer skin of the back surface of the blade 7 body. The wind collecting support member 10 is attached via the via.

That is, the air collecting support member 10 is notched on the blade 7 of the type in which the back surface portion 8 facing the rotating shaft portion 3 shown in FIG. The back surface of the front surface portion 12 facing the back surface portion 8 spreads in a substantially C shape from the front end side to the rear end side in the rotation direction, and from the back surface of the front surface portion 12 toward the rotary shaft portion 3. It has a pair of air collecting walls 13 and 13 that project.

Alternatively, the connection portion of the back surface 8 facing the rotating shaft 3 shown in FIG. 5 with the tip of the support rod 5 is cut into a substantially C shape from the front end side to the rear end side in the direction of rotation. In the blade 7 of the notched type, the wind collecting support member 10 has a wind collecting shape so as to block the notched portion 9 in the notched portion 9 having a letter C shape on the back surface portion 8 of the notched blade 7. The walls 13 and 13 are formed.

In this embodiment, as shown in FIGS. 1, 2, 4 and 5, the air collecting support member 10 is provided with the air collecting support at two connection positions of the support rods 5 on the back surface of the blade 7 main body. The members 10, 10 ... are each attached.

As described above, the shape of the air collecting walls 13 and 13 of the air collecting support member 10 is such that the end portion in the extending direction of the surface portion 12 projecting from the attaching surface 14 in the vertical direction from the one end portion of the attaching surface portion 14. As shown in FIG. 6, the air collecting walls 13 and 13 are formed in a substantially triangular shape.
As shown in FIGS. 4 and 5, the air collecting walls 13 and 13 are formed in a substantially letter C shape from the front end side to the rear end side in the rotation traveling direction. It is comprised so that the wind 15 blowing from may be caught.
As a result, a “drag” is generated in the wind collecting support member 10, a rotational moment is obtained in the blade 7, and the wind turbine is easily started.

Further, in rainy weather, raindrops 16 hit the wind collecting walls 13 and 13, and “winding force” is generated in the wind collecting support member 10 in the same manner as described above. It is configured as follows.

In addition, also on the back surface of the front surface portion 12 of the wind collecting support member 10, as in the above, by catching the wind 15 or hitting raindrops 16 in the rain, a “drag” is generated in the wind collecting support member 10, The blade 7 is configured to obtain a rotational moment.

Here, the air collecting support member 10 is formed of a material such as plastic (including polycarbonate and FRP) in order to keep light weight and high strength, and is manufactured in advance by stamping at a factory. It is.

Next, an embodiment of the wind turbine 1 for wind power generation according to the present invention will be described with reference to the drawings.

First, as shown in FIG. 1, the wind collecting support members 10, 10,... Are obtained for the blades 7, 7. Shall be installed with each attached.
That is, the wind turbine 1 for wind power generation forms a so-called Savonius type “drag type” wind turbine in the vertical axis type wind turbine described above.

In FIG. 1, as an example, the back surface portion 8 shown in FIG. 4 is configured by using a blade 7 of a type formed by cutting away the front end portion 17 in the rotation traveling direction.

Therefore, when the wind turbine 1 for wind power generation is started from a stopped state, the wind turbine is activated by using the “drag” generated in the wind collecting support members 10, 10. Shall be allowed to.

Specifically, as shown in FIG. 4, when the wind collecting support members 10, 10... Receive the wind 15 from behind, a large air resistance is generated on the wind collecting walls 13, 13 or the surface portion 12. "Drag" is generated.
Therefore, a rotational moment can be obtained by the drag generated on the wind collecting walls 13 and 13 or the surface portion 12, and the wind turbine rotates in the counterclockwise direction (arrow A direction).

As described above, the blade 7 shown in FIG. 4 is formed such that the back surface portion 8 is cut out with the tip portion in the rotation direction being left, so that the blade 7 also receives the wind 15 from the rear. Causes resistance.
Therefore, since the windmill can be rotated also by the drag of the blade 7, the rotational moment by the stronger drag can be obtained in combination with the action of the drag of the wind collecting support member 10 described above.

Thus, at the time of start-up, even if the wind collecting support member 10 and the blade 7 receive the wind 15 from the rear even in a low wind speed range of about 0.4 m / s, for example, a large air resistance is generated, thereby causing Savonius. The effect of the type windmill, that is, the rotational moment due to the resistance can be obtained, and the windmill starts and rotates.

Furthermore, the blade 7 is formed into a streamlined airfoil by bending a thin plate material made of a single-layer aluminum alloy or plastic (including polycarbonate and FRP), so that it can be rotated by "lift". A moment is obtained (see FIGS. 7 and 8).
FIG. 7 shows, as an example, lift B, drag C generated on the blade 7 when the wind 15 is received from the angle of attack α, and force D drawn on the shaft during rotation.
FIG. 8 also shows, as a reference, lift B, drag C, and force D drawn on the shaft, which are generated when the blade 7 rotates in a high wind speed region.

That is, simultaneously with the generation of the rotational moment due to the above-mentioned “drag”, the rotational moment can be obtained not only by the drag but also by “lift”.

Next, as shown in FIG. 7, when the wind turbine 1 for wind power generation rotates in a high wind speed region having a circumferential speed ratio of 1 or more, the wind turbine 1 for wind power generation is in the above-described vertical axis type. A so-called gyromill type “lift type” wind turbine is formed in the wind turbine.
Therefore, the wind turbine maintains its rotation in the counterclockwise direction (arrow A direction) by the lift force of the blade 7.

Here, as shown in FIG. 4, the blade 7 is formed by notching the back surface portion 8 leaving the tip in the direction of rotation, so that a high wind speed region with a circumferential speed ratio of 1 or more, or during strong winds. Conventionally, there has been a concern about the durability of the blade 7, but the blade strength is increased by the attachment of the air collecting support members 10, 10,.

Therefore, the wind turbine 1 for wind power generation according to the present invention is activated by the wind collecting support member 10 and the blade 7 to obtain a rotational moment due to “drag” due to air resistance in a low wind speed range with a peripheral speed ratio of 1 or less, Since the rotational moment can be maintained by the “lift” of the blade 7 even in a high wind speed region with a peripheral speed ratio of 1 or more, it is possible to generate power efficiently and to have a high-strength rotor blade. is there.

The embodiment of the present invention shown in FIGS. 1 to 3 includes a blade 7 of the type in which the back surface portion 8 shown in FIG. 4 is formed by cutting away the tip portion in the direction of rotation. However, the connection portion of the blade 7 with the front end of the support rod 5 in the back surface portion 8 shown in FIG. 5 is cut out in a substantially C shape from the front end side to the rear end side in the rotation direction. You may comprise using the type of blade 7 in which the part 9 was formed.

DESCRIPTION OF SYMBOLS 1 Windmill 2 for wind power generation Rotation enjoyment apparatus 3 Rotating shaft part 4 Generator 5 Support rod 6 Notch surface 7 Blade 8 Back surface part 9 Notch part 10 Wind collecting support member 11 Support material 12 Surface part 13 Wind collecting wall
14 Mounting surface 15 Wind 16 Raindrop
17 Cap member
A Windmill rotation direction
B Blade lift
C Blade drag
Force drawn on the D axis
E Drag of the air collecting support member

Claims (2)

A rotating shaft portion provided in communication with the rotation receiving device above the rotation receiving device in the axial direction;
A plurality of support rods projecting radially from the rotating shaft;
A blade of a rotary blade attached to the tip of the plurality of support rods so that the rotary shaft portion and the back surface portion face each other;
A wind collecting support member attached to the back surface of the blade of the rotor;
Have
The blade of the rotor blade is cut away with the back surface facing the rotating shaft part leaving a tip in the direction of rotation,
The air collecting support member extends in a substantially C shape from the front end side to the rear end side in the rotation traveling direction on the back surface of the front surface portion facing the notched back surface portion, and extends from the back surface of the front surface portion to the rotation shaft. Configured with a pair of air collecting walls projecting toward the part,
A wind turbine for wind power generation characterized by this.
A rotating shaft portion provided in communication with the rotation receiving device above the rotation receiving device in the axial direction;
A plurality of support rods projecting radially from the rotating shaft;
A blade of a rotary blade attached to the plurality of support rod tips so that the rotary shaft portion and the back surface portion face each other;
A wind collecting support member attached to the back surface of the blade of the rotor;
Have
The blade of the rotor blade has a back surface facing the rotating shaft portion cut out in a substantially C shape from the front end side to the rear end side in the rotation traveling direction,
The wind collecting support member is formed with a wind collecting wall that closes the notched portion in the notched portion that forms a C shape on the back surface of the notched blade.
A wind turbine for wind power generation characterized by this.

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