JP2003239847A - Wind mill blade for power generation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wind mill blade for power generation of a new structure in which lightweight and high strength is secured, and power is efficiently generated by greatly reducing air resistance. <P>SOLUTION: An inner circumference side vertical blade component member 32 is suspended on a respective tip end of a plurality of horizontal blades 4 of a Darrieus type wind mill. An outer circumference side vertical blade part 31 is attached and is integrated so as to straddle an entire outer side of the inner circumference side vertical blade component members 32a, 32b of the horizontal blades 4, 4 adjacent on a same plane in upper and lower directions. A vertical blade part 3 of a predetermined length in a predetermined thickness is integrally formed on an end part of each of the horizontal blades 4. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

SUMMARY OF THE INVENTION The present invention relates to a wind turbine blade capable of taking out naturally occurring wind power as a useful energy source and using it as power as it is, or for generating power, and in particular, it is lightweight. The present invention intends to provide a wind turbine blade for power generation, which has a new structure that can secure high strength, yet significantly reduces air resistance and enables efficient power generation.

[0002]

2. Description of the Related Art Due to the large consumption of fossil energy in industrialized countries, the carbon dioxide concentration in the earth's atmosphere has reached a level that can no longer be ignored, and abnormal weather thought to be caused by this frequently occurs in various places. Many people's lives and homes were lost due to natural disasters, and agricultural crops suffered a great deal of damage, and the prevention of global warming by reducing carbon dioxide emissions was seriously discussed, and Kyoto was held and adopted in Japan. Under the Protocol, efforts are being made by countries all over the world to actively try to restore the natural environment, such as committing to concretely set a target value for carbon dioxide reduction and putting it into action.

With respect to electric power resources that are indispensable in modern society, nuclear power generation is widely used as a power generation technology that does not generate carbon dioxide from this viewpoint.
There are problems such as leaving radioactive waste to the next generation, and increasing the potential sense of crisis for nuclear power, triggered by the accident at the Chernobyl nuclear power plant and the radiation exposure accident near the Onagawa nuclear power plant. There is a global tendency to review or stop the supply of electricity that depends on power generation, and when developing countries assume that they will reach the same level of electricity demand as developed countries in the near future. , It is almost impossible to cover the electricity resources on the earth with fossil energy and nuclear energy, which have the above-mentioned problems, and instead of them, a power generation technology using natural energy without pollution becomes indispensable. In the field, technological development of wind power generation, solar energy power generation, biomass gasification power generation, etc. has begun to proceed vigorously.

In wind power generation, propeller type, Dutch type, multi-blade type, cell wing type, paddle type, savonius type, cross flow type is selected by selecting a place where the wind blows well in consideration of natural conditions such as topography and seasonal winds. , Gyro mill type, Darrieus type, etc., various types of rotor blades are selected and installed as appropriate according to the power generation scale that is determined by the conditions of the local wind conditions, installation area, investment amount, etc. Is desirable, for example 0.5K in a relatively narrow space of about 1.5m square
One suitable as a relatively small wind turbine for generating electric power of about w is the Darrieus-type wind turbine blade 1 shown in the front view of the Darrieus-type wind turbine in FIG.

The Darrieus-type wind turbine blade for power generation 1 shown in this figure generally forms a pair of upper and lower parts of a vertical shaft portion 2 which is rotatably erected, and which is separated by a predetermined dimension in the upper and lower midway portions. A plurality of horizontal blades 4, 4, ... Are projected in a centrifugal manner, and a single plate-shaped vertical blade 3 is attached so as to be bridged between the tips of the pair of upper and lower horizontal blades 4,4. It is usual to use a tightening structure of bolts / nuts 51, 51, ... Using L-shaped connecting fittings 7, 7 at the joint between the horizontal blade 4 and the vertical blade 3. Manufactured to ensure durability against collisions such as gusts and dust, it is not necessary to change the direction of the wind turbine according to the wind direction like a horizontal axis wind turbine, and the generator can be installed on the ground side, so it is small. The feature is that it is easy to reduce the weight.

However, since this Darrieus-type wind turbine power generation does not have self-starting property and requires an auxiliary starting device, in order to obtain efficient operation, a plurality of vertical blades 3 and 3 and the vertical blades 3 and 3 are installed vertically. It is essential to manufacture the horizontal blades 4, 4, 4, ... Connected to the shaft portion 2 and the respective airfoil cross-sectional shapes as accurately as possible. ，
The projections of 51, ... impede the rectification of the wind flowing on the blade surface and increase the air resistance, so that it cannot be activated unless it reaches a fairly strong wind range, and as a result, the amount of power generation throughout the year is greatly reduced. Moreover, when the wind is strong, the high-speed rotation of the wind turbine blades 1 cuts off the wind and makes a loud roaring noise, which may lead to noise pollution. It had challenges and had the advantage that other types of wind turbines did not have, but narrowed the range of utilization.

In view of the above circumstances, the present invention is a Darrieus-type wind turbine that is light in weight, yet secures sufficient strength, can be easily started even in a light wind, and can be quietly rotated even at high speed rotation. After deciding that it would be impossible to realize a wind turbine blade in Japan, we rapidly began to develop and research it, and after repeated trial and error over a long period of time and many trials and experiments, this time, finally, a new structure of power generation The present invention has succeeded in realizing a wind turbine blade, and the configuration thereof will be described in detail below along with an embodiment representative of the present invention shown in the drawings.

[0008]

As clearly understood from the embodiments of the present invention shown in the drawings, the wind turbine blade for power generation of the present invention basically has the following structure. That is, a plurality of horizontal blades in the Darrieus-type wind turbine, the inner peripheral side vertical blade constituent members at the respective tips are extended or formed integrally by a predetermined length in either the vertical direction or the vertical direction in which they are orthogonal,
The outer peripheral vertical blades are attached and integrated so as to extend over the entire outside or a plurality of the inner peripheral vertical blade constituent members that are vertically adjacent to each other in the same plane arrangement, and predetermined at the end of each horizontal blade. Is a wind turbine blade for power generation, which has a structure in which vertical blade portions having a predetermined thickness and a predetermined thickness are integrally formed.

The power generation wind turbine blade having this basic structure is shown as a more specific structure. The power generation wind turbine blades are arranged at equal intervals on the same circumference with a predetermined radius from the vertical shaft portion. A plurality of vertical blades, extending substantially horizontally from above and below the vertical shaft portion in a substantially horizontal direction, and having their tips reach the inner peripheral side vertical blade portions that are on the inner side in the blade thickness direction of each vertical blade and are substantially vertical. Each horizontal blade in a Darrieus-type wind turbine consisting of a plurality of horizontal blades for connecting the blades to the vertical shaft portion is an inner-peripheral-side vertical blade portion that is inside in the blade thickness direction of the vertical blades that correspond in advance to the respective tips. Is formed in a substantially L-shape or a T-shape in which the inner-circumferential-side vertical blade constituent member corresponding to a part of the above is stretched and integrated in a vertical direction in the vertical direction or in the vertical direction by a predetermined length. One set for each of these horizontal wings,
They are arranged vertically adjacent to each other in the same plane arrangement on the outer periphery of the vertical shaft portion, and are arranged such that the inner peripheral side vertical blade constituent members are arranged in contact with each other in the vertical direction. A single plate-shaped outer-peripheral-side vertical wing portion, which is the outer side in the blade thickness direction of the vertical blade, is attached so as to extend over the entire outside of the inner-peripheral-side vertical blade constituent member, and is integrated into a vertical body of a predetermined thickness and a predetermined length The blade portion serves as a wind turbine blade for power generation, which is integrally formed at the tip of each horizontal blade.

Further, as a more specific configuration, a plurality of vertical blades arranged at equal intervals from each other on the same circumference having a predetermined radius from the vertical shaft portion, and the vertical shaft. So as to extend substantially horizontally from the upper and lower appropriate parts of the section and reach the tip of the inner peripheral side vertical blade portion which is the inner side in the blade thickness direction of each vertical blade so that each vertical blade is substantially connected to the vertical shaft portion. Each horizontal blade in a Darrieus-type wind turbine composed of a plurality of horizontal blades is divided into an upper surface side horizontal blade member and a lower surface side horizontal blade member, and the vertical blade thickness direction corresponding to each tip in advance. An inner peripheral side vertical blade constituent member corresponding to a part of the inner peripheral side vertical blade portion is extended and integrated in a perpendicular vertical direction by a predetermined length and is integrated to form a substantially L-shaped upper surface side horizontal blade member and a substantially L-shaped upper surface side horizontal blade member. Falling L-shaped lower surface side horizontal wing members, and those upper surface side horizontal wing members A plurality of horizontal blades each having a pair of lower surface side horizontal blade members are set as a set, and they are vertically adjacent to each other in the same plane arrangement on the outer periphery of the vertical shaft portion, and each inner peripheral side vertical blade component member. The upper and lower parts are arranged in contact with each other in the vertical direction, and the outer periphery of a single plate is formed on the outer side in the blade thickness direction of the vertical blade so as to extend over the entire outer side of the inner peripheral side vertical blade constituent members of the contact shape. It can be said that a wind turbine blade for power generation is formed by additionally forming the side vertical blades and integrally forming the vertical blades having a predetermined thickness and a predetermined length at the tips of the horizontal blades.

More specifically, a plurality of vertical blades arranged at equal intervals from each other on the same circumference having a predetermined radius from the vertical shaft portion, and the vertical blade portions substantially above and below the vertical blade portion. A plurality of horizontal blades that extend in the horizontal direction and reach the inner vertical blades on the inner side in the blade thickness direction of each vertical blade to substantially connect each vertical blade to the vertical shaft portion. Each of the horizontal blades in the Darrieus-type wind turbine consisting of and is divided into an upper surface side horizontal blade member and a lower surface side horizontal blade member, and the inner ends of the respective horizontal blades in advance in the blade thickness direction inside of the corresponding vertical blades. The inner peripheral side vertical blade constituent member corresponding to a part of the peripheral side vertical blade portion is extended in a vertical direction in a perpendicular direction by a predetermined length,
They are integrally formed into a substantially L-shaped upper surface side horizontal blade member and a substantially inverted L-shaped lower surface side horizontal blade member which are FRP hollow blade structures, and the upper surface side horizontal blade member and the lower surface side horizontal blade member are formed. A set of a plurality of horizontal blades, each of which has a predetermined thickness and is integrally formed by a pair of adhesives and / or bolts and nuts, is set as a set, and they are arranged vertically adjacent to each other in the same plane arrangement on the outer circumference of the vertical shaft portion. , The inner peripheral side vertical blade constituent members are arranged to be in contact with each other in the vertical direction, and the inner peripheral side vertical blade constituent members are in contact with each other.
A single plate-shaped FRP hollow blade structure, which is on the outer side in the thickness direction of the vertical blade, is attached to the outer peripheral vertical blade portion using an adhesive and / or bolts / nuts, and integrated to have a predetermined wall thickness. A vertical blade portion having a length serves as a wind turbine blade for power generation, which is integrally formed at the tip of each horizontal blade.

If the wind turbine blade for power generation of the present invention having the above-mentioned configuration as a gist is shown as a more desirable configuration, it is equally spaced from each other on the same circumference having a predetermined radius from the vertical shaft portion. A plurality of vertical blades to be arranged, and extending substantially horizontally from the upper and lower proper positions of the vertical shaft portion, and the tip thereof reaches the inner peripheral side vertical blade portion that is on the inner side in the blade thickness direction of each vertical blade. Each horizontal blade in the Darrieus-type wind turbine consisting of a plurality of horizontal blades for connecting each vertical blade to the vertical shaft portion, is divided into an upper surface side horizontal blade member and a lower surface side horizontal blade member, and An inner peripheral side vertical blade constituent member corresponding to a part of the inner peripheral side vertical blade portion, which is on the inner side in the blade thickness direction of the corresponding vertical blade, is stretched in advance in a perpendicular direction by a predetermined length in either of the orthogonal vertical directions. , L-shaped upper surface integrated with FRP hollow blade structure The horizontal wing member and the substantially inverted L-shaped lower surface side horizontal wing member are joined to each other with the upper surface side horizontal wing member and the lower surface side horizontal wing member as a pair, and the wing length of the thickest part Bolts and nuts are installed and tightened in the counterbore holes of both the upper and lower horizontal blades that are perforated at predetermined intervals in the direction. After tightening, FRP resin is filled, smoothed, reinforced and integrated. A set of horizontal blades with a predetermined thickness is set as one set, and they are arranged vertically adjacent to each other in the same plane arrangement on the outer periphery of the vertical shaft portion, and the inner peripheral side vertical blade constituent members abut on each other vertically. FRP hollow wing structure with a single plate shape that is the outer side in the blade thickness direction of the vertical blade so as to extend over the entire outside of the inner peripheral side vertical blade constituent members in contact with each other. Peripheral side vertical wings are attached,
An inner peripheral vertical blade configuration in which the blades are joined with an adhesive to form vertical blades that are continuous with the tips of the horizontal blades, and the thickest portions of the vertical blades are perforated at predetermined intervals in the blade length direction. Bolts and nuts are attached to the counterbore holes of both the member and the outer peripheral side vertical wing, tightened, filled with FRP resin, smoothed and reinforced, integrated, and the vertical wing with a predetermined wall thickness and a predetermined length is The wind turbine blade for power generation has a configuration in which it is integrally formed at the tip of each horizontal blade.

Further, as another desirable configuration,
A plurality of vertical blades arranged at equal intervals from each other on the same circumference with a predetermined radius from the vertical shaft portion, and extending substantially horizontally from the upper and lower appropriate places of the vertical shaft portion, and the tip ends of each vertical blade. Each horizontal blade in a Darrieus-type wind turbine is composed of a plurality of horizontal blades that reach the inner peripheral side vertical blades that are inside in the blade thickness direction and substantially connect each vertical blade to the vertical shaft. , Is divided into an upper surface side horizontal blade member having a fan-shaped flange for attaching a vertical shaft portion on the blade base end side and a lower surface side horizontal blade member having a similar fan-shaped flange, and corresponds to each tip in advance. The inner peripheral side vertical blade constituent member corresponding to a part of the inner peripheral side vertical blade portion on the inner side in the blade thickness direction of the vertical blade is stretched and integrated by a predetermined length in any of the orthogonal vertical directions, and both are FR.
A substantially L-shaped upper surface side horizontal wing member and a substantially L-shaped lower surface side horizontal wing member having a hollow wing structure made of P. The upper surface side horizontal wing member and the lower surface side horizontal wing member are paired and / or A set of a plurality of horizontal blades that are integrated by bolts and nuts and have a predetermined thickness is set as a set, and they are arranged vertically adjacent to each other in the same plane arrangement on the outer circumference of the vertical shaft portion. , Each of which is connected to the vertical shaft portion by a pair of upper and lower fan-shaped flanges, and the inner peripheral side vertical blade constituent members are vertically arranged in contact with each other at the blade tip side. An outer peripheral vertical blade portion having a single-plate FRP hollow blade structure that is on the outer side in the blade thickness direction of the vertical blade so as to straddle the entire outer side of each abutting inner peripheral side vertical blade component is an adhesive and / Alternatively, it is attached by using bolts and nuts and integrated to have a predetermined wall thickness and a predetermined length. Vertical wings, the power generating wind turbine blades is the inclusion of structure which is to be integrally formed at the tip of each horizontal blade.

The vertical shaft portion rotatably supports a wind turbine blade composed of a plurality of vertical blades and horizontal blades supporting the vertical blades, and transmits the rotational motion of the wind turbine blades to a generator. It functions and is formed into a cylindrical body that is rotatably mounted on a fixed shaft that is vertically and fixedly erected, and integrally supports and supports the bases of a plurality of horizontal blades at appropriate positions on the outer periphery thereof. To rotate around the fixed axis, or to form a vertical rod-shaped body in which the lower end side is rotatably mounted on a vertically fixed cylindrical bearing part, A structure in which a plurality of horizontal blade bases are connected and supported at appropriate places on the outer circumference of the body to rotatably support the wind turbine blades, or a vertical rod-shaped body is fixedly erected and the bearing inner ring is fixed to the vertical rod-shaped body. And then attach the base of the horizontal wing to the outer ring of the coaxial receiver to rotatably support it. If the bearing is exposed to the outside, it is desirable to provide a waterproof cover or seal structure to prevent the ingress of rainwater and dust, and either the upper end or the lower end. An output gear for power generation, a pulley for an output belt, a sprocket for an output chain, or the like may be provided in a proper place to have a structure capable of outputting the rotational force generated by the wind turbine blade to the outside.

Each of the vertical blades is on the same circumference and has a predetermined wing-shaped horizontal cross section which is fixed at a predetermined angle by the horizontal blades. It has the function of converting into rotational thrust in a predetermined direction around the vertical shaft part according to the strength of the wind force, and the orientation of all wing-shaped horizontal sections is constant at the same location around the vertical shaft part. The blades have a vertical plate shape with a blade-shaped cross-section of the blade thickness section that is symmetrical or asymmetrical from the center of the wall thickness, and has almost the same blade from the upper end to the lower end. A cross-sectional shape is desirable, and NACA (National Advis
ory Committee for Aeronaut
ics) or NREL (National Rene)
Appropriately selecting and adopting an already developed airfoil, such as an airfoil with a wavy energy laboratory) or an airfoil developed by the Institute of Wind Energy, Delft University of Technology in the Netherlands, or an airfoil imitating an aircraft or helicopter blade. Is possible.

The vertical blades are machined from wood such as spools, ezomatsu, ho, and cypress, and are coated with resin to ensure waterproofness, aluminum alloy,
A metal such as stainless steel or titanium alloy having excellent corrosion resistance can be manufactured by cold forging, die casting, or rolling, as it is, or by appropriately welding, or acrylic, polycarbonate, or GFR.
P (glass fiber reinforced resin), CFRP (carbon fiber reinforced resin), AFRP (aramid fiber reinforced resin), GRTS (glass fiber reinforced thermosetting resin), F
RTS (other fiber reinforced thermosetting resin), GRTP
(Glass fiber reinforced thermoplastic resin), FRTP (other fiber reinforced thermoplastic resin), etc. FRP (Fibergla)
ss Reinforced Plastics alone or FRP (Fiber-Reinf)
orced Composite), TFT (Trav)
Although it can be appropriately manufactured by combining resin materials with excellent durability such as erse filament tape), the horizontal blades described below, especially the horizontal blades on the upper surface and the horizontal surfaces on the lower surface that must be integrally formed in advance with the horizontal blades. From the viewpoint of convenience and durability in forming the wing member, at least the outer skin and outer shell are made of metal such as aluminum alloy or titanium alloy, which has excellent durability and corrosion resistance, or various FRP, or equivalent. The core of the honeycomb structure made of foamed resin or light metal may be provided inside, or the outer skin portion or outer shell itself may have a thin and hollow structure.

The inner peripheral side vertical blade portion is a side surface portion on the vertical shaft side of the vertical blade, and is divided into inner peripheral side vertical blade constituent members to be integrally formed with a horizontal blade to be described later, In addition to the formed horizontal blades, at the stage of assembling and integrating the horizontal blades, which will be described later, a part of the inner peripheral side vertical blades is integrated in a substantially orthogonal shape at the tip of the horizontal blades. It has a function of avoiding inconvenience due to a structure in which the inside of a separate vertical blade is attached to the blade tip and is integrated, and the inner peripheral side vertical blade constituent member formed integrally with the horizontal blade is formed. It is formed by vertically adjoining the tips so as to be in contact with each other, and continuously by an appropriate means to form a single plate, and in relation to the horizontal blade described later, for example, an aluminum alloy. , Stainless steel, titanium alloy, etc. The horizontal blade is integrally formed with the horizontal blade by cold forging or die casting, or is integrally formed with the horizontal blade end by welding. In addition to being integrally molded, it can also be integrated using an adhesive, and either of them is molded so that the connecting portion with the horizontal wing is continuous with a curved surface, or a reinforcing plate or FRP around the corner part.
It is desirable to have a structure in which the stress can be dispersed from the corners by, for example, attaching or laminating a material, or embedding a reinforcing rib material inside.

The inner peripheral vertical blade constituent members also have a function of determining the airfoil shape of the connecting portion of the horizontal blades and the vertical blades, thus forming an unnecessary protruding shape that increases air resistance. The horizontal blades and the vertical blades should be continuous so that sufficient strength can be obtained, and the horizontal blades described below or the upper horizontal blades and / or the lower horizontal blades forming a part of the horizontal blades. Provided integrally at the tip of the member, share a part of the inner peripheral side vertical blade of the vertical blade to be formed, so that sufficient strength can be obtained when assembled to form the inner peripheral side vertical blade. It should be made of the same material as the below-mentioned horizontal blades integrally formed, or the upper-side horizontal blade members and / or the lower-side horizontal blade members forming a part thereof, and both should be simultaneously molded by injection molding or the like. , Built-in reinforcing rib material and core material as needed Outside can be made with, it is possible to reduce the weight of a hollow structure.

The outer peripheral side vertical blade portion forms a side surface portion on the outer peripheral side of the vertical blade, and completes the airfoil shape of the vertical blade together with the inner peripheral side vertical blade portion. It has the function of strengthening the integrated structure with the horizontal blades that are connected to multiple points between the upper and lower ends, and it is desirable that it is formed as a single plate across the upper and lower ends. It is also possible to divide it into one piece, and a blade that supplements the inner peripheral side vertical blade portion in the gap between the outer and upper and lower inner peripheral side vertical blade portions and the outer portion of the upper and lower ends of the inner peripheral side vertical blade portion. It is also possible to integrally attach the shaped portion to adjust the airfoil shape.

In the horizontal blade, the above-mentioned vertical blades are arranged such that all the blade-shaped horizontal cross sections are aligned in a fixed direction around the vertical shaft portion on the same circumference at a predetermined height position separated from the vertical shaft portion by a predetermined distance. Support as a vertical wind turbine, and the rotational thrust generated by the wind force around the vertical axis of the vertical blade in a predetermined direction is safe.
The blade has a function of reliably transmitting it to the vertical shaft section described above, and the cross-sectional shape of the blade is adjusted so that the vertical thrust of the vertical blade is not reduced by the air resistance caused by its own rotation. The profile should be a horizontal plate shape that is symmetrical or asymmetrical from the center of the wall thickness, and it should be the NACA, NREL, or the profile of the Delft University of Technology Wind Energy Research Institute in the Netherlands, or an aircraft. It is possible to appropriately select and adopt an airfoil or the like that replicates a helicopter blade.

The horizontal blades are light and hard like the above-mentioned vertical blades and are made of wood or light metal or FRP.
Although it can be manufactured by using a composite material such as, the at least the outer skin portion or outer shell body in consideration of integral moldability with the inner peripheral side vertical blade constituent member of the vertical blade, durability, corrosion resistance, etc. Should be made of aluminum alloy, titanium alloy, or other metal with excellent durability and corrosion resistance, various FRP materials, or materials equivalent to them, with polyurethane, polystyrene, polyethylene inside. A foam made of polypropylene, PVC, silicon, or the like, a core made of a honeycomb material such as an aluminum honeycomb, an aramid honeycomb, or the like can be provided, or the outer skin portion or the outer shell itself can have a thin wall and a hollow structure.

The upper surface side horizontal wing member is a portion that constitutes the upper skin portion or outer shell of the horizontal blade, and functions to complete the entire airfoil of the horizontal blade by being integrated with the lower surface side horizontal blade member. In addition to supporting the weight of the vertical blades described above, it must be capable of maintaining its own horizontal attitude and ensuring sufficient tensile strength to maintain the vertical attitude of the vertical blades. In order to reduce the weight, it is desirable to have a hollow structure, and the joint surface with the lower surface side horizontal wing member should secure the entire surface as an adhesive surface to enable a strong bond, and The lower surface side horizontal wing member is a portion that constitutes the outer skin portion or outer shell of the lower side of the horizontal blade, and serves to complete the horizontal blade by combining with the upper surface side horizontal blade member. Supports the weight of the vertical wing, It is necessary to secure sufficient compressive strength so that it can support the horizontal postures of the above and the vertical postures of the vertical blades, and it is possible to select a material different from the upper horizontal blade member that requires strong tensile strength. Therefore, it is desirable to secure as wide a joint surface as possible with the upper surface side horizontal wing member so as to enable strong coupling.

The fan-shaped flange has a function of firmly mounting each base end portion of a plurality of horizontal blades at an accurate mounting position of the vertical shaft portion, and mounts 360 ° on the horizontal plane around the vertical shaft portion. It should be formed in a fan shape with an opening angle equally divided by the number of vertical blades, and it is attached and fixed to the vertical shaft side by a plurality of bolts penetrating in the vertical direction. It is desirable that the base be formed separately from the horizontal blades if necessary, and that the base of the horizontal blades be integrated by bolts, welding, or an adhesive when the wind turbine is assembled and installed.

The counterbore hole is used for connecting the inner peripheral side vertical blade portion (inner peripheral side vertical blade constituent member) and the outer peripheral side vertical blade portion, and for connecting the upper surface side horizontal blade member and the lower surface side horizontal blade member. When doing so, the rivets used for connection and the heads of bolts, nuts, etc. can be installed so as to be buried in the wing-shaped cross section,
It has the function of preventing unnecessary protrusions on the completed wind turbine, and must have a diameter and depth that allow the heads of the rivets, bolts, nuts, etc. to be used to be completely buried. However, in order to use bolts and nuts with a large nominal diameter, it is desirable to perforate and form them in the thickest part of the airfoil, and those that are formed at regular intervals along the blade length direction. After tightening with rivets, bolts and nuts, seal with a special cap, fill with premix, or fill with a polyester or epoxy adhesive etc. to finish the airfoil shape. It can be smooth.

When the respective parts of the vertical blades and the horizontal blades are manufactured by using FRP, particularly thermoplastic resin (FRTP), it is possible to form the respective parts by a single injection molding, which results in efficient production. Needless to say, other parts obtained by injection molding or vacuum forming can be combined and bonded together to form an airfoil closed cross-section structure by adhesive or heat welding, as well as gas injection. It is also possible to form an airfoil having a hollow structure inside by molding or blow molding. When a thermosetting resin (FRTS) is used as the FRP, the manual loading method, the bag method, the soft plunger method, the matched die method, the filament winding method, the premix method, the spray-up method, the vacuum injection method,
It can be manufactured by various known manufacturing methods such as a continuous drawing method and a continuous laminating method. Hereinafter, the structure of the wind turbine blade for power generation included in the present invention will be more clearly understood along with the structure of the present invention shown in the drawings as well as the structure thereof.

[0026]

1 is a front view of a generator having a Darrieus-type wind turbine blade of FIG. 1, a plan view of the Darrieus-type wind turbine blade of FIG. 2, a perspective view of a power generation wind turbine blade in an exploded state of FIG. 3, and a vertical view of FIG. The example shown in the horizontal cross-sectional view of the blades is that three vertical blades are arranged at equal intervals on the same circumference with a predetermined radius centered on the vertical shaft part, and each vertical blade has a plurality of horizontal blades. A typical embodiment of a wind turbine blade for power generation having the basic configuration of the present invention, which is connected to the vertical shaft portion by a blade so that the entire wind turbine blade is rotatable around the vertical shaft portion. It is shown.

The wind turbine blade 1 for power generation has a fixed shaft portion 6 extending upward from an upper end of a pillar body 6 erected on the ground.
Three pieces each for two sets of mounting fan-shaped flange portions 21 and 21 formed at the upper end portion and the lower end side intermediate portion of the cylindrical vertical shaft portion 2 rotatably attached to 2, the horizontal blades 4, 4, ... Are projectingly provided so as to extend toward the outer peripheral side of the vertical shaft portion 2 with an opening angle of 120 ° as shown in FIG. , 4, ... are mounted at positions facing each other, and vertical blades 3 are integrally connected between the ends of the horizontal blades 4, 4 which are vertically arranged to form a pair, and the Darrieus-type wind turbine blades are integrally connected. Is to form the entire shape of.

As shown in FIG. 3, the horizontal blade 4 is composed of an upper surface side horizontal blade member 41 and a lower surface side horizontal blade member 42 obtained by vertically dividing the blade cross section from the base end portion to the tip end portion into two parts. Is an FRP injection molded product and is formed into a hollow inner part by gas injection or by bonding the outer shape parts to each other with an adhesive, etc. The fan-shaped flanges 43, 43 set at an angle of 120 ° are integrally formed on the base end portions of the blades 41, 42, respectively, and the tip end portions of the fan-shaped flanges 43, 43 are formed on the inner peripheral side of the vertical blade 3. The inner peripheral side vertical blade constituent members 32a and 32b that form the above are integrally connected, and the side surface shape of one upper surface side horizontal blade member 41 is substantially L-shaped, and the other lower surface side horizontal blade member 42 is formed. Lateral shape is approximately rollover L
In addition to being formed in a letter shape, the corresponding lower surface and upper surface are joined and integrated by an adhesive to form a horizontal blade 4 from the base end side to the tip side that is substantially the same as the already known NACA0012 airfoil. The fan-shaped flange 43,
43 is also integrated, and by connecting the mounting fan-shaped flange portions 21 and 21 of the vertical shaft portion 2 with bolts and nuts, three horizontal blades 4 are provided at the same height position in each of the upper and lower sides. , 4, 4 are attached and fixed.

Further, the inner peripheral side vertical blade constituent members 32a, 32b are provided at the tip of the horizontal blade 4 formed by laminating the upper surface side horizontal blade member 41 and the lower surface side horizontal blade member 42 in a superposed state. Is formed by being vertically stretched, and the overall side shape including the horizontal blades 4 forms a rollover T shape, and a total of 4 horizontal blades 4 and 4 that form a pair on the vertical line. Inner peripheral vertical blade component 32
a, 32b, ... are arranged such that their respective tips are adjacent to each other in abutting contact with each other, and the inner peripheral side vertical blade constituent members 32a, 32b ,. Peripheral side vertical wing part 3 in a plate shape so as to straddle
A well-known NACA002 has a substantially uniform horizontal cross section between the upper and lower ends by abutting and adhering 1 to integrate them.
The vertical wings 3 have a four-wing shape.

Further, the upper surface side horizontal blade member 41 and the lower surface side horizontal blade member 42 constituting the horizontal blade 4, and the inner peripheral side vertical blade constituent member 32 and the outer peripheral side vertical blade portion 31 constituting the vertical blade 3.
In addition, as shown in the horizontal cross-sectional view of the vertical blade 3 shown in FIG. 4, a plurality of counterbore holes are formed in the thickest portions of the blade at predetermined intervals in the blade length direction. 5, 5, ... Are perforated and bolts and nuts 51,
The vertical wing 3 and the horizontal wing 4 are firmly reinforced and coupled by 51, ..., And the FRP is installed in each of the counterbore holes 5,5 ,. Is put into a putty and filled, and the wing shape is finished smoothly.

The outer peripheral vertical blade portion 31 of the vertical blade 3 is
In addition to the above-described embodiment, it is also possible to divide into a plurality of upper and lower parts as in the case shown in the perspective view of the power generation wind turbine blade in the disassembled state of FIG. All of the side vertical wing portions 31, 31, 31 come into contact with each other in the vertical direction, and are joined in a structure straddling the connecting portions of the continuous inner peripheral side vertical wing constituent members 32a, 32b, so that a substantially single plate shape is obtained. The outer peripheral side vertical wing portion 31 may also be used, which is naturally also the outer peripheral side vertical wing portion 3 of the present invention.
It is included in 1.

Further, the inner peripheral side vertical blade constituent members 32a, 32
Since the opposing ends of b are spaced apart from each other, when the outer peripheral side vertical blade portion 31 becomes insufficient in total length, or the total length of the inner peripheral side vertical blade constituent members 32a and 32b is equal to the outer peripheral side vertical blade portion 31. Since the length is short with respect to each other, when the facing tips are arranged apart from each other, the inner peripheral side vertical blade portion 32 side formed by the inner peripheral side vertical blade constituent members 32a, 32b ,. Of the inner peripheral side vertical vane 32 and / or the outer peripheral side of the vertical vane 3 where the outer peripheral side vertical vane part 31 is insufficient, or the inner peripheral side vertical vane part 32 is lacking. For example, when it is possible to assume that a supplementary portion (not shown) having a horizontal cross-sectional shape, which is necessary to form the vertical wing portion 31, is formed separately and is integrated with the side where it is sufficient, or that the supplementary portion is insufficient in advance. Bulges on the opposite side of the foot Of By assembling the like shall interpolator integrally form, it can be obtained by forming to a substantially vertical airfoil shape without the overall shape defect of the blade 3.

[0033]

In the power generation wind turbine blade 1 of the present invention having the above-described configuration, the upper surface side horizontal blade member 41 and the lower surface side horizontal blade member 42 are brought into contact with each other and integrated to form the horizontal blade 4 having a hollow structure. Along with the formation of the horizontal blade 4, the outer peripheral vertical blade 31 is brought into contact with the inner peripheral vertical blade portion 32 formed by the inner peripheral vertical blade constituent members 32a, 32b, ... Also, since the vertical wing 3 having the same hollow structure is formed, the horizontal wing 4 and the vertical wing 3 are continuously integrated into one body while being lightweight, and the rigidity is greatly increased. It will bring about the effect that it can be enhanced.

Moreover, as a result, it is possible to prevent the stress from being concentrated on the connecting portion between the vertical blade 3 and the horizontal blade 4, and to omit the component for connecting the horizontal blade 4 and the vertical blade 3. , It is possible to eliminate unnecessary protrusions due to those parts, and it is expected that it will not cause air friction resistance that hinders rotation efficiency as much as possible. If the horizontal blades 4 and the vertical blades 3 having a shape and structure suitable for efficiency are determined, it becomes easy to standardize the shape and structure according to them, and the performance is almost the same regardless of the assembly work. This also brings about the effect that the wind turbine blade 1 for power generation can be realized.

Further, the outer peripheral vertical blade portion 31 of the vertical blade 3 is
The upper and lower horizontal blades 4, 4 are vertically projected from the tips of the horizontal blades 4, 4 and abut on the same vertical line, and are integrated so as to straddle continuous inner peripheral side vertical blade constituent members 32a, 32b. Due to the structure, the strength of the vertical blades 3 formed is surely a one-plate structure, and the Darrieus-shaped shape of the wind turbine blade 1 can be firmly maintained so that the rotational thrust can be reliably obtained. However, this action also installs bolts and nuts 51, 51, ... so as to be buried in counterbore holes 5, 5, ... provided at various places to reinforce the integration and further adjust the airfoil shape. As described above, the counterbore holes 5, 5, ... Are filled with FRP and finished to have a smooth surface so that the protrusions of the bolts and nuts that deteriorate the air resistance are eliminated and the wind turbine blade 1
It will be guaranteed as an even more reliable one after increasing the overall structural strength.

As shown in the embodiment, the fan-shaped flange 43 formed at the base end of the horizontal blade 4 has a mounting angle range of, for example, 120 ° in advance, or the circumference is equally divided. If the blades are set to the divided angles and are attached as three blades or the number of horizontal blades 4 according to an equal fraction, the required number of horizontal blades 4, 4, automatically and accurately.
... and the vertical wings 3, 3, ... are attached and fixed positions are determined, and the orientations of all the vertical wings 3, 3, ... are automatically and accurately determined. It will lead to the action of making it possible.

[0037]

As described above, in the wind turbine blade for power generation according to the present invention, the inner peripheral side vertical blade constituent member that shares a part of the inner peripheral side vertical blade portion of the vertical blade is previously integrally formed on the tip side. A substantially L-shaped or a substantially T-shaped upper surface side horizontal wing member and a lower surface side horizontal wing member, and the upper surface side horizontal wing member and the lower surface side horizontal wing member are contacted and integrated to form a horizontal wing. When
By assembling the standardized existing members of the inner peripheral side vertical blade constituent members and the outer peripheral side vertical blade part of a single plate shape, which are projecting in the same vertical line orthogonal to the horizontal blade, in a predetermined combination, Since it was possible to realize a Darrieus-type wind turbine blade with a robust and accurate structure, it was possible to secure sufficient coupling strength between the vertical blades and the horizontal blades, and to provide air resistance to the connecting portion between the vertical blades and the horizontal blades. It eliminates the need for various types of connecting metal fittings and increases the vertical and horizontal blades to achieve an optimized airfoil shape that can significantly reduce the air resistance and lower the starting wind speed. Not only does it increase significantly, it becomes a delicate and high-strength Darrieus-type wind turbine blade regardless of assembly work, and it is possible to reliably and economically realize a power generator for small power generation that uses wind power as natural energy. Road heating and snow melting roof,
The excellent feature is that it can be widely used as lighting for various illuminations and as electric power for various other uses in a residential area.

In particular, the wind turbine blade 1 for power generation described in the embodiment.
In addition to the features described above, the inner peripheral side vertical blade constituent members 32a and 32b of the horizontal blades 4 and 4 which are vertically adjacent to each other are arranged in a vertically abutting manner so that the inner peripheral side vertical blade structure is formed. A single plate-shaped outer peripheral side vertical blade portion 31 is provided so as to straddle the members 32a and 32b, and the vertical blades 3 are finished to have a predetermined blade shape by integrating them. 32a,
It is possible to sufficiently secure the strength of the connection portion between the 32b and to disperse the stress, and to integrate the horizontal blades 4 with the upper surface side horizontal blade member 41 and the lower surface side horizontal blade member 42 each having a hollow structure. Since the vertical blades 3 are formed by integrating the inner peripheral side vertical blade constituent member 32 and the outer peripheral side vertical blade portion 31 each having a hollow structure, the strength of the entire wind turbine blade 1 is improved. The advantage is that it can be remarkably improved as compared with the conventional structure.

Further, the components of the vertical wing 3 and the horizontal wing 4 are joined together by bonding, and the upper side horizontal wing member and the lower side which are perforated at predetermined intervals in the wing length direction at the thickest portion. The bolts and nuts 51 are attached to the counterbore holes 5 on both the horizontal blade members, and after tightening, they are filled with FRP resin, smoothed and reinforced, and integrated to eliminate the protrusion of the bolts and nuts 51 to the outside. It is made of high-strength material and enables the optimum blade shape to be completed. In addition, a fan-shaped flange 43 set at an angle of 120 ° is formed at the base end of the horizontal blade 4, and fixed and assembled by a general mounting means. If so, the installation of the three horizontal blades 4 will be accurately determined without any special measurement or adjustment for each position, and the man-hours for installation work will be significantly reduced.
It is extremely practical because it enables sophisticated and quick assembly and installation, which makes it extremely economical, and can reliably avoid troublesome troubles such as unnecessary vibration and noise after installation. The effect is obtained.

As described above, the wind turbine blade for power generation of the present invention is
The new structure allows the intended purpose to be achieved uniformly, and it is easy to manufacture and can be provided to the market at a comparatively low price. It has high strength and light weight, and it is a Darrieus type from the past. It is much more economical than a wind turbine blade, and even if it is installed in a residential area, it does not take up much space, and the efficiency of assembly and installation work on site can be greatly improved, reducing costs and shortening the construction period. Since it can be reliably achieved, it can be used for a wide range of applications as an extremely safe power generation device, not only from the electric power industry that is increasingly required to use natural energy that does not cause environmental pollution, but also from the private sector or It is expected that it will be widely used and spread, as it will be highly evaluated by the managers of various public facilities and will contribute greatly to the life of the general public. It is.

[Brief description of drawings]

The drawings show some typical examples embodying the technical idea of the wind turbine blade for power generation of the present invention.

FIG. 1 is a front view showing a generator using a Darrieus-type wind turbine blade.

FIG. 2 is a plan view showing a structure of a wind turbine blade for power generation.

FIG. 3 is an exploded perspective view showing a structure of a wind turbine blade for power generation.

FIG. 4 is a horizontal sectional view showing a sectional structure of a vertical blade.

FIG. 5 is an exploded perspective view showing a wind turbine blade for power generation with a modified vertical blade structure.

FIG. 6 is a front view showing a conventional wind turbine blade for power generation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Wind turbine blade 2 for power generation Vertical shaft part 21 The same fan-shaped flange part 3 for mounting 3 Vertical blade 31 Same outer peripheral side vertical blade part 32 Same inner peripheral side vertical blade part 32a Same L-shaped upper surface side It is integrally formed with the horizontal blade member. Inner peripheral side vertical blade constituent member 32b Inner peripheral side vertical blade constituent member 4 Horizontal blade 41 Same upper surface side horizontal blade member 42 Same lower surface side horizontal blade member 43 Same fan-shaped flange 5 Counterbore 51 Same bolts and nuts 6 Post body 61 Same fixed shaft section 7 Connecting metal fittings

Claims (6)

[Claims] 1. A plurality of horizontal blades in a Darrieus-type wind turbine, each of which has an inner peripheral side vertical blade constituent member extending at a predetermined length in an up-down direction or an up-down direction which is orthogonal to each other,
They are integrally formed, and the outer peripheral side vertical wing portions are attached and integrated so as to extend over the entire outside or a plurality of the inner peripheral side vertical blade constituent members that are vertically adjacent to each other in the same plane arrangement. A wind turbine blade for power generation, characterized in that a vertical blade portion having a predetermined thickness and a predetermined length is integrally formed at an end portion. 2. A plurality of vertical blades arranged at equal intervals from each other on the same circumference with a predetermined radius from the vertical shaft portion, and extending in a substantially horizontal direction from a proper position above and below the vertical shaft portion,
Darrieus-type wind turbine consisting of a plurality of horizontal blades whose tip reaches the inner-peripheral-side vertical blade portion, which is the inner side in the blade thickness direction of each vertical blade, to substantially connect each vertical blade to the vertical shaft portion. Each of the horizontal blades in each of the vertical blades has, at its tip, an inner peripheral side vertical blade component corresponding to a part of the inner peripheral side vertical blade portion, which is the inner side in the blade thickness direction of the corresponding vertical blade, in the vertical direction or the vertical direction. Approximately L formed by stretching and integrating a predetermined length in either direction
Each of the horizontal blades is formed into a letter-shaped or rollover T-shaped shape, and a plurality of horizontal blades are set as a set, and they are arranged vertically adjacent to each other in the same plane arrangement on the outer circumference of the vertical shaft portion. The side vertical blade constituent members are arranged vertically in an abutting arrangement, and are arranged outside the vertical blade in the blade thickness direction so as to extend over the entire outer side of each abutting inner peripheral side vertical blade constituent member. For power generation, a single plate-shaped outer peripheral vertical blade is attached and integrated to form a vertical blade having a predetermined thickness and a predetermined length integrally at the tip of each horizontal blade. Windmill wings. 3. A plurality of vertical blades arranged at equal intervals from each other on the same circumference with a predetermined radius from the vertical shaft portion, and extending in a substantially horizontal direction from a proper position above and below the vertical shaft portion,
Darrieus-type wind turbine consisting of a plurality of horizontal blades whose tip reaches the inner-peripheral-side vertical blade portion, which is the inner side in the blade thickness direction of each vertical blade, to substantially connect each vertical blade to the vertical shaft portion. Each horizontal wing in, is divided and formed into an upper surface side horizontal wing member and a lower surface side horizontal wing member, and at the tip of each, in advance,
An inner peripheral side vertical blade constituent member corresponding to a part of the inner peripheral side vertical blade portion, which is on the inner side in the blade thickness direction of the corresponding vertical blade, is extended in a perpendicular direction in a vertical direction by a predetermined length and integrated to form a substantially L-shape. Each of the plurality of horizontal blades formed on the upper surface side horizontal blade member and the substantially inverted L-shaped lower surface side horizontal blade member, and the upper surface side horizontal blade member and the lower surface side horizontal blade member as a pair are vertically integrated. One set of them is arranged vertically adjacent to each other in the same plane arrangement on the outer circumference of the vertical shaft portion, and the inner peripheral side vertical blade constituent members are arranged vertically in contact with each other. A single plate-shaped outer peripheral vertical blade that is on the outer side in the blade thickness direction of the vertical blade is attached so as to extend over the entire outside of each inner peripheral side vertical blade constituent member. A wind turbine blade for power generation, characterized in that a vertical blade portion having a length is integrally formed at the tip of each horizontal blade. 4. A plurality of vertical blades arranged at equal intervals from each other on the same circumference with a predetermined radius from the vertical shaft portion, and extending in a substantially horizontal direction from a proper position above and below the vertical shaft portion,
Darrieus-type wind turbine consisting of a plurality of horizontal blades whose tip reaches the inner-peripheral-side vertical blade portion, which is the inner side in the blade thickness direction of each vertical blade, to substantially connect each vertical blade to the vertical shaft portion. Each horizontal wing in, is divided and formed into an upper surface side horizontal wing member and a lower surface side horizontal wing member, and at the tip of each, in advance,
The inner peripheral side vertical blade constituent member corresponding to a part of the inner peripheral side vertical blade portion, which is the inner side in the blade thickness direction of the corresponding vertical blade, is stretched and integrated for a predetermined length in any of the orthogonal vertical directions, and both are FRP. An approximately L-shaped upper surface side horizontal wing member and a substantially inverted L-shaped lower surface side horizontal wing member having a hollow wing structure made of a hollow wing structure, and an adhesive and / Alternatively, a plurality of horizontal blades, which are integrated with bolts and nuts and have a predetermined thickness, are set as a set, and they are arranged vertically adjacent to each other on the same plane arrangement on the outer circumference of the vertical shaft portion, and each inner circumference is vertical. The blades are arranged vertically in abutting contact with each other, and the outer blades of the vertical blades are arranged on the outer side in the thickness direction so as to extend over the entire outer side of the abutting vertical blade constituent members. -Like FRP hollow wing structure with outer peripheral side vertical wing is adhesive and / The other is by using the bolts and nuts additionally provided,
A wind turbine blade for power generation, characterized in that a vertical blade portion having a predetermined wall thickness and a predetermined length is integrally formed at the tip of each horizontal blade. 5. A plurality of vertical blades arranged at equal intervals from each other on the same circumference having a predetermined radius from the vertical shaft portion, and extending in a substantially horizontal direction from a proper position above and below the vertical shaft portion,
Darrieus-type wind turbine consisting of a plurality of horizontal blades whose tip reaches the inner-peripheral-side vertical blade portion, which is the inner side in the blade thickness direction of each vertical blade, to substantially connect each vertical blade to the vertical shaft portion. Each horizontal wing in, is divided and formed into an upper surface side horizontal wing member and a lower surface side horizontal wing member, and at the tip of each, in advance,
The inner peripheral side vertical blade constituent member corresponding to a part of the inner peripheral side vertical blade portion, which is the inner side in the blade thickness direction of the corresponding vertical blade, is stretched and integrated for a predetermined length in any of the orthogonal vertical directions, and both are FRP. It is formed on a substantially L-shaped upper surface side horizontal blade member and a substantially L-shaped lower surface side horizontal blade member having a hollow wing structure, and the upper surface side horizontal blade member and the lower surface side horizontal blade member are paired by an adhesive agent. In addition, attach bolts and nuts to the counterbore holes on both the upper and lower horizontal blade members, which are drilled at predetermined intervals in the blade length direction in the thickest part, and tighten the FRP resin after tightening. A plurality of horizontal blades with a predetermined wall thickness, which are filled, smoothed, reinforced, and integrated, are set as a set, and they are arranged vertically adjacent to each other in the same plane arrangement on the outer circumference of the vertical shaft portion. Make sure that the peripheral vertical blade components are in contact with each other vertically. In addition, the outer peripheral vertical blades having a single-plate FRP hollow blade structure, which are on the outer side in the blade thickness direction of the vertical blades, are added so as to extend over the entire outer side of the inner peripheral side vertical blade constituent members in contact with each other. Installation and bonding with an adhesive to make a vertical blade continuous to the tip of each horizontal blade as described above, and the innermost vertical side where the thickest portions of the vertical blades are perforated at predetermined intervals in the blade length direction Bolts and nuts are installed in the counterbore holes of both the blade constituent members and the vertical blades on the outer peripheral side, and after tightening, they are filled with FRP resin, smoothed and reinforced to integrate them, and the vertical blades have a specified thickness and a specified length. However, the wind turbine blade for power generation is characterized in that it is integrally formed at the tip of each horizontal blade. 6. A plurality of vertical blades arranged at equal intervals from each other on the same circumference having a predetermined radius from the vertical shaft portion, and extending in a substantially horizontal direction from an appropriate place above and below the vertical shaft portion,
Darrieus-type wind turbine consisting of a plurality of horizontal blades whose tip reaches the inner-peripheral-side vertical blade portion, which is the inner side in the blade thickness direction of each vertical blade, to substantially connect each vertical blade to the vertical shaft portion. Each horizontal blade in, is divided into an upper surface side horizontal blade member having a fan-shaped flange for attaching the vertical shaft portion on the blade base end side, and a lower surface side horizontal blade member having a similar fan-shaped flange, and respectively. The inner peripheral side vertical blade constituent member corresponding to a part of the inner peripheral side vertical blade portion, which is the inner side in the blade thickness direction of the vertical blade corresponding to the tip of, is stretched and integrated by a predetermined length in any of the orthogonal vertical directions. All of which are formed into a substantially L-shaped upper surface side horizontal blade member and a substantially inverted L-shaped lower surface side horizontal blade member having a hollow blade structure made of FRP, and the upper surface side horizontal blade member and the lower surface side horizontal blade member as a pair. And / or bolts and nuts are integrated to achieve a specified wall thickness. Each of the horizontal blades consists of a set of fan blades, and they are arranged vertically adjacent to each other in the same plane arrangement on the outer circumference of the vertical shaft portion. Each of the inner peripheral side vertical blades is connected to the vertical shaft portion so that the inner peripheral side vertical blade constituent members are vertically arranged in contact with each other. An outer peripheral side vertical blade portion having a FRP hollow blade structure made of a single plate, which is the outer side in the blade thickness direction of the vertical blade so as to extend over the entire outside of the constituent member, is attached using an adhesive and / or a bolt / nut, A wind turbine blade for power generation, characterized in that a vertical blade portion having a predetermined wall thickness and a predetermined length is integrally formed at the tip of each horizontal blade.