WO2012150691A1

WO2012150691A1 - Blade for impeller wheel for wind turbine device, and impeller wheel for wind turbine device

Info

Publication number: WO2012150691A1
Application number: PCT/JP2012/061184
Authority: WO
Inventors: 一喜野元; 一臣野元; 学屋宜
Original assignee: 株式会社ビルメン鹿児島
Priority date: 2011-05-02
Filing date: 2012-04-26
Publication date: 2012-11-08
Also published as: JP5296141B2; JP2012233445A

Abstract

Two or more blades (30) are provided to an impeller wheel (3) for a wind turbine device (1) in such a manner that the blades (3) are disposed about the rotating shaft (2) so that the blades (3) rotate in a given rotation direction about the rotating shaft (2) when subjected to a wind force acting in the direction of the axis of the rotating shaft (2). Each of the blades (30) is provided with: a blade body (30T) extending outward radially relative to the rotating shaft (2); and a blade tip (30S) extending from the outer side of the blade body (30T) and shaped in such a manner that the blade tip (30S) is bent in the direction opposite the specific rotation direction. As a result of the configuration, the blades provided to the impeller wheel for a wind turbine device generate reduced noise during rotation, improve the rotational performance, and, in addition to such improvements in functions, are excellent in design.

Description

Wind turbine blade for wind power generator and wind turbine for wind power generator

The present invention relates to a wind turbine for a wind turbine generator and a wing used for the wind turbine.

In recent years, attention has been focused on wind power generation that does not emit greenhouse gases such as carbon dioxide as a power generation method using renewable energy in order to preserve the global environment (for example, Patent Document 1).

JP 2004-239113 A

However, there is still a demand for improvement in the function of wind turbines of wind power generators. For example, there is a problem that sound is generated during rotation. There is also a need for further improvement in rotational performance. On the other hand, there is a problem of lacking design features. Wind turbine blades of wind power generators vary in type depending on the type of wind turbine, but in the same type of wind turbine, the shape of the blade is basically similar, and there are designs with eye-catching designs. Absent.

An object of the present invention is to provide a wind turbine for a wind power generation apparatus that suppresses a sound generated at the time of rotation and improves the rotation performance, and has an improved design as well as an improved wing as well.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, a wind turbine blade for a wind turbine generator according to the present invention includes:
A wind turbine blade of a wind turbine generator provided with two or more around the rotation axis so as to receive wind force from the axial direction of the rotation axis and rotate around the rotation axis in a constant rotation direction,
A wing body part extending radially outward with respect to the rotation shaft, and a wing tip part extending from the outside of the wing body part to the opposite side to the constant rotation direction are provided.

The wind turbine blade for a wind turbine generator according to the present invention has a shape in which the outer front end portion is bent in the direction opposite to the constant rotation direction. Since the blade tip has a shape extending in the direction opposite to the rotation direction, it is possible to suppress the sound generated when the blade rotates. In addition, it has a unique shape that has a tail with respect to the rotation of the wing. Moreover, since the shape of having a tail with respect to the rotation of the wing is a shape indicating the rotation direction as a result, a visual effect that the rotation direction can be made conscious is also obtained.

Also, by providing a portion (blade tip) that extends in the direction opposite to the direction of rotation at the tip of the wing, the wind receiving area on the outer peripheral side increases, and rotational force can be obtained more effectively from the wind. Became possible. In addition, since the weight on the outer peripheral side is increased, the effect of preserving the rotational energy of the windmill is also improved, and the rotation of the windmill is difficult to stop, so that highly efficient wind power generation can be expected.

In the wind turbine blade for a wind turbine generator according to the present invention, when the wind-receiving surface side that receives wind to rotate in a constant rotation direction is the front side, the blade tip portion is linear in front view and rear view. It can be made into the shape which seems to curve and continue from the wing | blade main-body part. In the front view and the back view, the wing tip that looks like a hook that curves in an arcuate shape is formed from the wing body that appears to extend linearly. It becomes a wing of a simple shape. Also, in front view and back view, the wing tip is formed in a shape that smoothly curves and continues from the straight wing body, so that not only design is increased, but also wind can be passed efficiently. It becomes possible.

In the wind turbine blade for a wind turbine generator according to the present invention, when the wind receiving surface side is the front side, the tip of the blade is a straight tip opposite to the blade main body in front view and rear view. It can be formed in a visible shape. That is, it can be set as the shape where the front-end | tip was cut linearly. The wing often has a tapered shape in which the width of the wind receiving surface decreases toward the outer tip, and in this case, the tip may become too thin and weak in strength. It becomes a shape that cuts the part where the tip becomes too thin, and can be a wing that can withstand strong winds.

Further, the blade of the wind turbine for the wind turbine generator according to the present invention has a blade body that extends straight at the front end and the rear end of the tip of the blade tip when the wind receiving surface side is the front side. It may be formed in a shape that looks substantially parallel to the side edge in the constant rotation direction of the part, and may have a characteristic design.

In the present invention, when the above-mentioned constant rotational direction side is the upper surface side of the blade, the blade tip portion is viewed from the wind receiving surface side (receiver) with respect to the extending direction of the blade body portion in the top view and the bottom view. The shape may be bent in the direction opposite to the wind direction. By bending the blade tip in the direction opposite to the wind receiving direction, it is possible to effectively receive the wind at the bent portion, and to rotate efficiently by the received wind. In addition, because it has a three-dimensional characteristic wing shape, design is also improved.

In the present invention, the wind receiving surface of the blade main body can be shaped to warp in the wind receiving direction toward the outer peripheral side (wing tip side). According to this configuration, a part of the wind received by the wind receiving surface of the blade main body can be passed to the outer peripheral side. And, on the outer peripheral side of the blade body part, by providing the blade tip part bent in the direction opposite to the wind receiving direction (wind receiving surface side), the wind received by the wind receiving surface of the blade body part on the outer peripheral side is Since the wind receiving surface of the blade tip is received and converted into a rotational force, the blade can be rotated with high efficiency by wind power. Further, even if stress is collected on the tip side (outer peripheral side) of the blade, the stress can be released in such a manner that the blade tip side becomes elastic in the wind receiving direction. Furthermore, since the tip side has a shape bent in the rotation direction of the blade, the stress can be released even when the tip side is elastically twisted.

In addition, the wind receiving surface of the blade body portion has a shape that warps in the direction opposite to the wind receiving direction toward the outer peripheral side (blade tip side), and the wind receiving surface of the blade tip portion is reverse to the wind receiving direction. When the shape is bent to the (wind receiving surface side), the tip position of the blade tip is positioned so as to protrude in the direction opposite to the wind receiving direction (wind receiving surface side) from the wind receiving surface of the blade body. By doing so, the wind received by the wind receiving surface of the blade body portion on the outer peripheral side can be more reliably received by the wind receiving surface of the blade tip.

The blade of the present invention can have a shape in which the thickness increases toward the inner peripheral base end (root side). Thereby, the thickness increases toward the fixed side to the rotating shaft, and the strength and rigidity can be increased.

In the present invention, the blade tip can be formed in a form that continues smoothly and continuously from the outer peripheral side of the blade body. As a result, the design is increased and the wind can be efficiently passed.

The blade of the present invention can have a shape in which the surface width of the wind receiving surface decreases toward the tip on the outer peripheral side. Thereby, the thickness increases toward the fixed side to the rotating shaft, and the strength and rigidity can be increased.

In the present invention, the blade angle of the wind turbine for the wind turbine generator can be configured by providing a blade angle variable mechanism that rotates the angle formed by the surface width direction of the wind receiving surface with respect to the wind receiving direction. .

A wind turbine blade for a wind turbine generator according to the present invention has a ridge at the center in the width direction so that the back surface opposite to the wind receiving surface has a ridge line extending in the blade extending direction from the blade body portion to the blade tip portion. A convex part of the mold can be formed. The convex portion can be formed such that the ridge line is located at a position deviated toward the constant rotational direction in the width direction of the back surface.

The wind turbine of the wind power generator of the present invention can be provided with three blades of the present invention having equal intervals around the axis of the rotating shaft.

The perspective view which shows the wind power generator which is one Embodiment of this invention. The perspective view of the blade of the windmill of FIG. FIG. 3 is a rear view of the blade of FIG. 2. The front view of the braid | blade of FIG. FIG. 4 is a left side view of the blade of FIG. 3. FIG. 4 is a right side view of the blade of FIG. 3. FIG. 4 is a plan view of the blade of FIG. 3. FIG. 4 is a bottom view of the blade of FIG. 3. The side view of the windmill part of the wind power generator of FIG. Side surface sectional drawing (side perspective drawing) of FIG. It is the wind power generator of FIG. 1, Comprising: The figure which looked at the braid | blade and the hub from the wind receiving direction upstream. The elements on larger scale of FIG. FIG. 12B is a sectional view taken along line AA in FIG. 12A. FIG. 12B is a sectional view taken along line BB in FIG. 12A. It is a fragmentary sectional view of the wind power generator which has the windmill of FIG. 11, Comprising: The figure which shows the state in which the weight member was located inside radial direction. The elements on larger scale of FIG. It is a fragmentary sectional view of the wind power generator which has the windmill of FIG. 11, Comprising: The figure which shows the state which the weight member was located in the radial direction outer side. The elements on larger scale of FIG. The schematic diagram which showed the state of FIG. 14 simply. The schematic diagram which showed simply the state which planarly viewed FIG. The schematic diagram which showed the state of FIG. 16 simply. The schematic diagram which showed simply the state which planarly viewed FIG. The schematic diagram which illustrates simply the rotation operation | movement of the braid | blade in embodiment of FIG. The figure following FIG. 21A. The figure following FIG. 21B. The top view which shows the modification of the braid | blade of FIG. The bottom view of FIG. It is the wind power generator which is embodiment of this invention different from FIG. 1, Comprising: The figure which looked at the braid | blade and the hub from the wind receiving direction upstream. The elements on larger scale of FIG. FIG. 25B is a cross-sectional view taken along the line AA in FIG. 25A. FIG. 25B is a BB cross-sectional view of FIG. 25A. FIG. 25 is a partial cross-sectional view of the wind turbine generator having the windmill of FIG. 24, and schematically shows a state in which the weight member is located on the radially inner side. The schematic diagram which showed the state which planarly viewed FIG. FIG. 25 is a partial cross-sectional view of the wind turbine generator having the windmill of FIG. 24, and schematically shows a state in which the weight member is located on the radially outer side. The schematic diagram which showed simply the state which planarly viewed FIG. FIG. 25 is a schematic diagram for simply explaining the rotation operation of the blade in the embodiment shown in FIG. The figure following FIG. 30A. The figure following FIG. 30B. The figure following FIG. 30C. FIGS. 12A to 12C and FIGS. 25A to 25C are views for explaining an angle changing mechanism different from FIGS. FIGS. 12A to 12C and FIGS. 25A to 25C and 32 are views for explaining an angle changing mechanism different from FIGS.

Hereinafter, an embodiment of a wind turbine of a wind turbine generator according to the present invention, a blade (wing) of the wind turbine, and a wind turbine generator using the wind turbine will be described with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a wind turbine generator according to the present invention. The wind turbine 3 of the wind turbine generator 1 shown in FIG. 1 is configured to receive wind power from the axial direction 2x (see FIG. 11) of the rotary shaft 2 and rotate around the rotary shaft 2 in a constant rotational direction. 30 or more are provided around the rotating shaft 2. The blades 30 are arranged at predetermined intervals around the rotation axis 2x and are formed in the same shape.

As shown in FIG. 2, the blade 30 is formed in a shape in which the wind receiving surface 30w is twisted so that a difference in flow speed occurs between the rotating shaft 2 side and the tip 30s side. Specifically, the blade 30 is formed in such a shape that the pitch becomes shallower toward the tip 30s side.

Further, the blade 30 of the present invention includes a blade body 30T extending radially outward with respect to the rotating shaft 2, and a blade tip 30S extending from the outside of the blade body 30T to the opposite side to the constant rotation direction. And comprising. That is, the blade 30 has a shape in which the outer front end portion is bent in the direction opposite to the constant rotation direction, and has a shape that has a tail with respect to the rotation of the blade 30.

The blade tip 30S has a shape that appears to bend and continue from the blade main body 30T that extends linearly in front view (FIG. 4) and rear view (FIG. 3). The blade tip 30S here is formed so as to continue smoothly from the outer peripheral side of the blade body 30T and extends linearly in front view (FIG. 4) and rear view (FIG. 3). From the outer peripheral side of the visible blade main body 30T, it is formed to look like a hook that is curved in an arc shape.

In addition, the blade tip portion 30S has a shape in which the tip 30s positioned opposite to the blade body portion 30T can be seen in a straight line in the front view (FIG. 4) and the back view (FIG. 3). In other words, the blade 30 has a shape in which a curved tip is cut into a straight line. The cut surface is formed to face the direction opposite to the constant rotation direction. Here, the tip 30s of the blade tip 30S has the constant rotation direction of the blade body 30T extending linearly in the radial direction with respect to the rotary shaft 2 in the front view (FIG. 4) and the back view (FIG. 3). It is formed in a shape that appears to be substantially parallel to the side end face (end edge portion) 30a.

The back surface 30v of the blade 30 (the surface opposite to the wind receiving surface 30w) has a mountain shape at the center in the width direction so as to have a ridge line 30p along the blade extending direction from the blade main body 30T to the blade tip 30S. Convex part 30P is formed. In addition, in the width direction W of the back surface 30v, the convex portion 30P is provided at a position where the ridgeline 30p is biased toward the rotation support shaft 33Z (see FIGS. 12A to 12C) of the blade fixing portion 33 described later. That is, as shown in FIG. 3, the convex portion 30P here is formed so that the ridge line 30p is located at a position deviated toward the constant rotation direction side (upper side in FIG. 3) in the width direction W of the back surface 30v. The surface width of the surface 30p1 on the direction side (upper side in FIG. 3) is shorter than the surface width of the surface 30p2 on the opposite side (lower side in FIG. 3).

The blade tip portion 30S has a blade body with respect to the extending direction of the blade body portion 30T in a top view (FIG. 7) and a bottom view (FIG. 8) when the above-described constant rotation direction side of the blade 30 is the upper side. It is made into the shape bent to the wind-receiving surface side (direction opposite to a wind receiving direction) of the part 30. FIG. With this bent shape, the blade 30 can easily receive wind at the bent portion. For this reason, it can rotate efficiently by the received wind. Also, the stress applied to the tip side (outer peripheral side) of the blade 30 can be resisted in such a manner that the blade tip side is in the wind receiving direction, and has a high strength structure. In addition, as described above, the tip end side (outer peripheral side) of the blade 30 is bent in the direction opposite to the rotation direction, so that the blade tip side resists the wind force even when the blade tip side is elastically twisted. Therefore, the structure has higher strength.

Further, as shown in FIGS. 7 and 8, the wind receiving surface 30w of the blade main body 30T has a shape slightly warped in the wind receiving direction toward the outer peripheral side (blade tip side). On the side, a blade tip 30S that is bent in the direction opposite to the wind receiving direction (wind receiving surface side) is provided. Further, as shown in FIGS. 5 and 6, the outer peripheral edge position of the tip 30s of the blade tip 30S is higher than the wind receiving surface 30w of the blade body 30T when viewed from the outer periphery. It is located so as to protrude in the reverse direction (wind receiving surface side).

The blade 30 has a tapered overall shape in which the thickness increases toward the inner peripheral side (base side) end 30t and the surface width of the wind receiving surface 30w decreases toward the outer peripheral side (tip). On the further inner peripheral side of the end portion 30t, there is a fixing portion 30U fixed by the blade fixing portion 33.

As shown in FIGS. 1 and 9, a wind guide case (nacelle) 200 that also serves as a power generation unit case (housing) is provided on the windward side of the blade 30 (wind turbine 3). A power generation unit is stored inside the air guide case (nacelle) 200, and a wind direction fin (wind direction plate part) 202 is integrally formed outside the air guide case 200 (also the case main body 201). Can do. In the present embodiment, there is no cylindrical wind tunnel (duct) outside the wind turbine 3, and the wind turbine 3 is exposed (exposed) and receives wind. The case main body 201 of the air guide case 200 has a smooth outer peripheral surface in which a cross section perpendicular to the axial direction of the wind turbine 3 forms a vertically long oval shape or a circular shape, and the windward end of the case main body 201 is the front end side. It has an arcuate vertical cross section that becomes thinner smoothly and has a small curvature at the tip.

On the outer peripheral surface of the case main body 201, the above-described wind direction fins 202 protrude outward (for example, upward) from the outer peripheral surface of the case main body 201 (wind guide case 200) in the direction along the axial direction of the windmill 3. The wind direction fins 202 occupy a positional relationship perpendicular to the rotating surface of the windmill 3. The wind direction fin 202 includes a hypotenuse 203 having a length that is equal to or slightly shorter than the axial length of the case main body 201 and gradually increasing in height from the vicinity of the windward front end of the case main body 201 in an arc shape (or linear shape). And a rear end portion 204 that reaches the maximum height near the leeward end of the case body 201 and descends so as to bite (curve) from the top to the windward side (curved) (on the leeward side). The rear end bulges in an arc shape or the rear end hangs down linearly), but the lower end thereof is continuous with the upper surface of the case body 201. Further, the wind direction fin 202 has a slanted side 203 that is sharpened like a knife edge, and has a curved surface that is sharper toward the rear end from the intermediate portion toward the rear end portion 204. The middle part is the thickest and has a sharp triangular shape when viewed from the windward side.

On the opposite side (lower side) of the wind direction fin 202 across the axis of the case main body 201, a column connection part 208 is formed that connects to a column (pole) 110 that maintains the wind turbine 3 at a predetermined height. The column 110 is connected here. The column connection portion 208 protrudes downward from the lower surface of the case body 201 and smoothly tapers, and the lower end portion is formed in a cylindrical shape. The upper end portion of the circular cross section of the column 110 is formed in the cylindrical portion. As shown in FIG. 9, the wind guide case 200 and the wind turbine 3 are rotatably supported around the axis (vertical axis) of the support 110 via the bearings 210. As a result, the wind turbine 3 and the wind guide case 200 are kept free so that the wind direction fins 202 formed in the wind guide case 200 follow the wind direction, in other words, the rotating surface of the wind turbine 3 always faces the wind direction. Will be.

FIG. 10 is a side sectional view (perspective view) of a portion including the wind turbine 3 and the wind guide case 200, and the rotation shaft 2 of the wind turbine 3 is concentrically with the center line of the wind guide case 200 inside the wind guide case 200. The power generation case body 100 is concentrically assembled to the rotary shaft 2. Further, the angle adjusting mechanism 300 of the windmill 3 described with reference to FIGS. 12A to 12C and FIGS. 13 to 21A to 21C is also accommodated in the wind guide case 200.

As shown in FIGS. 9 and 15, the central portion of the wind turbine 3 (the base end portion of the blade 30) is occupied by a cylindrical section 212 having a circular cross section. A cone-shaped central portion 214 that protrudes in a cone shape to the opposite side (leeward side) from the air guide case 200 is formed, and the cone-shaped central portion 214 and the cylindrical portion 212 (the diameter is slightly tapered toward the leeward side). An annular recess 216 with a cone that is annular and narrows toward the bottom is formed between the substantially cylindrical portion), and the hub 22 and the blade fixing portion 33 are disposed therein. Even if the wind direction changes greatly and wind comes from the rear of the air guide case 200, the cone-shaped annular recess 216 receives a wind from the rear to generate a rotational moment. As a result, the wind in the free state The guide case 200 and the windmill 3 can change their postures (directions), for example, by nearly 180 degrees, and the postures can be changed so that the tips of the wind guide cases 200 face the windward (facing the wind).

Hereinafter, the structure in the air guide case (nacelle) 200 will be described.

FIG. 11 is a view of the blade and the hub viewed from the front side (upstream side in the wind receiving direction) in the wind power generator 1 of FIG. 1, and FIG. 12A is a partially enlarged view thereof. FIG. 13 is a partial cross-sectional view of the wind turbine generator of the present embodiment having the windmill 3 of FIG. 11, and FIG. 14 is a partial enlarged view thereof. In both cases, a weight member 35 described later is located inward. ing. FIG. 15 is a partial cross-sectional view of the wind turbine generator of the present embodiment having the windmill of FIG. 11, and FIG. 16 is a partial enlarged view thereof. In both cases, a weight member 35 described later is located outward. Yes.

A wind turbine 3 of the wind turbine generator 1 shown in FIG. 11 includes a rotating shaft 2, two or more blades (blades) 30 provided around the rotating shaft 2, and a blade receiving surface 30w (FIGS. 21A to 21D). 21C) and the blade fixing portion 33 fixed to the rotary shaft 2 in such a manner that the angle θ formed by the width direction W of the rotary shaft 2 and the direction of the rotation axis 2x of the rotary shaft 2 can be varied, and the angle θ of the blade 30 The first stage of facilitating accelerated rotation as a predetermined initial rotational angular position A that is closest to the wind parallel (wind parallel direction X: wind receiving direction 2w) when the wind power is below a predetermined light wind level ( A rotation start stage), a second stage (high rotation stage) that changes to near the wind orthogonal (wind orthogonal plane Y) when the wind exceeds a predetermined light wind level, and facilitates higher speed rotation, Overspeeds when the wind exceeds a certain high wind level The angle adjustment mechanism 300 has each stage corresponding to the wind force, which is a third stage (over-rotation prevention stage) that prevents the occurrence of wind noise, and adjusts so as to vary autonomously according to the wind force in each of these stages. (See FIGS. 13 to 20).

In the wind turbine 3 of this embodiment, the wind receiving direction 2w coincides with the direction of the rotation axis 2x of the rotation shaft 2 as shown in FIGS. The wind turbine 3 connects (connects) the plurality of blades 30 disposed so as to rotate in a certain direction by receiving wind force from the wind receiving direction 2w, and the plurality of blades 30 so as to be integrally rotatable with the rotary shaft 2. And a hub 22.

The blade 30 is arranged such that the wind receiving surface 30w (see FIGS. 21A to 21C) intersects the wind receiving direction 2w, and rotates by receiving wind force from the direction of the rotation axis 2x of the rotary shaft 2. Two or more blades 30 are provided around the rotation axis 2x at predetermined intervals (here, three at regular intervals), and each blade 30 extends radially outward with respect to the rotation shaft 2.

As shown in FIGS. 14 and 16, the hub 22 includes a shaft fixing portion (fixing member) 221 that is fixed so as to rotate integrally with the rotary shaft 2, and blade fixing that fixes each blade 30 to the shaft fixing portion 221. Part (wing fixing part) 33. Accordingly, each blade 30 is fixed to the shaft fixing portion 221 (see FIGS. 11 and 12A to 12C) by the corresponding blade fixing portion 33, and rotates integrally with the rotary shaft 2.

As shown in FIGS. 14 and 16, the shaft fixing portion 221 is a cylindrical front end portion 221 </ b> A having a disk shape and a center portion of the front end portion 221 </ b> A extending downstream in the wind receiving direction of the rotary shaft 2. And a rear end portion 221B. The shaft fixing portion 221 has the rotating shaft 2 inserted through from the upstream side in the wind receiving direction, and is fixed so that they are integrally rotated by a fastening member.

As shown in FIGS. 14 and 16, the blade fixing portion 33 is provided for each of a plurality of blades 30, and when the corresponding blade 30 receives wind force, the width direction W of the wind receiving surface 30 w is close to the wind parallel. A common shaft fixing portion (fixing member) that receives the pressing force FW (see FIGS. 21A to 21C) and has a variable angle θ between the width direction W and the direction of the rotation axis 2x. 221 is fixed. Thus, each blade fixing portion 33 is integrally fixed to the rotating shaft 2 via the common shaft fixing portion (fixing member) 221 fixed so as to be rotatable integrally with the rotating shaft 2.

The blade fixing portion 33 according to the present embodiment can change the angle formed between the rotation support shaft 33Z extending in the extending direction of the blade 30 and the axis 33z (see FIGS. 12A to 12C) of the rotation support shaft 33Z. This is a hinge member having two fixed

portions

33A and 33B forming a pair. One fixing portion 33 </ b> A is integrally fixed by a fastening member to a fixing portion 30 </ b> U that forms an inner peripheral side end portion of the blade 30 in a form through the blade attachment member 330. The other fixing portion 33B is also integrally fixed to the shaft fixing portion 221 on the rotating shaft 2 side by a fastening member, so that the entire blade fixing portion 33 can be integrally rotated with the shaft fixing portion 221.

As shown in FIGS. 12A to 12C, the blade mounting member 330 according to the present embodiment includes

parallel plate portions

330A and 330A that form a pair for sandwiching the blade 30, and an orthogonal coupling portion 330B that couples them in an orthogonal manner. The blade 30 (fixed portion 30U) sandwiched between the

parallel plate portions

330A and 330A is integrally fixed by a fastening member. 12A is an enlarged partial cross-sectional view of one plate fixing portion in FIG. 11, FIG. 12B is a schematic view showing a cross section AA in FIG. 12A, and FIG. 12C is a schematic view showing a BB cross section in FIG. It is. However, the angle θ formed by the width direction W of the blade 30 and the direction of the rotation axis 2x is different between the left side and the right side of FIGS. 12B and 12C. The left side of FIGS. FIG. 12B and FIG. 12C show the state where the blade 30 is close to the wind parallel. 12A to 12C, the fixing portion 33A of the blade fixing portion 33 is fastened and fixed to the orthogonal coupling portion 330B, and the blade 30 can rotate around the axis 33z of the rotation support shaft 33Z together with the

parallel plate portions

330A and 330A. ing. On the other hand, the fixing portion 33B of the blade fixing portion 33 is directly fixed to the shaft fixing portion 221 by a fastening member.

As shown in FIGS. 18 and 20, the rotation support shaft 33Z is configured so that the blade 30 rotates around the first end 30A side in the width direction W and the other second end 30B side rotates. It is provided at a position biased toward the first end 30A. In the present embodiment, the first side end 30A is on the inner circumferential side with respect to the axis 33z, and the second side end 30B is on the outer circumferential side, and the rotation support shaft 33Z here is the first side The axis 33z is located outside the edge position on the end 30A side.

As shown in FIGS. 21A to 21C, the angle adjusting mechanism 300 has a blade 30 that receives the wind force when the wind force falls below a predetermined level of light wind. Initial position holding means (extended portion 380 and abutment portion 390 described later here) for holding at a predetermined initial rotation angular position A, and a bias for biasing and holding the blade 30 at the initial rotation angular position A. The means 34 (see FIGS. 14 and 16) and the centrifugal force FA is applied to the blade 30 by the pressing force FW on the wind receiving surface 30w and the urging means 34 when the wind force exceeds the light wind level. By overcoming the urging force FB, the blade 30 is displaced toward the blade 30 via the link mechanism 37 (see FIGS. 14 and 16) so that the blade 30 can be displaced toward the wind orthogonal (wind orthogonal surface Y). Communicating A weight member 35 (see FIG. 14 and FIG. 16), and when the wind power reaches a predetermined strong wind level, the blade 30 has a predetermined angular position for high-speed rotation in which the width direction W is closest to the wind orthogonal direction. When the wind force reaches B and the wind force further exceeds the strong wind level, the pressing force FW by the wind force and the urging force FB of the urging means 34 overcome the centrifugal force FA and push the weight member 35 inward. Thus, the blade 30 is returned so that its width direction W is close to the wind parallel.

In the present invention, that the width direction W of the wind receiving surface 30w of the blade 30 is close to the wind parallel means that the width direction W of the wind receiving surface 30w of the blade 30 and the wind receiving direction 2w (that is, rotation of the rotary shaft 2). This means that the angle formed by the direction of the axis 2x, that is, the wind parallel direction X) is closer to the smaller side, and the width direction W of the wind receiving surface 30w of the blade 30 is closer to the wind orthogonal. This means that the angle formed by the width direction W of the surface 30w and the surface Y orthogonal to the wind receiving direction 2w (that is, the surface Y orthogonal to the direction of the rotation axis 2x of the rotating shaft 2) is closer to the smaller side.

Hereinafter, the configuration of the angle adjustment mechanism 300 of the present embodiment will be described with reference to FIGS. The angle adjustment mechanism 300 of the present invention is not limited to the configuration of the present embodiment described below.

The weight member 35 is provided for each of the plurality of blades 30 and is attached so as to be rotatable integrally with the rotary shaft 2 as shown in FIGS. 17 and 19. These weight members 35 themselves rotate with the rotation of the rotating shaft 2, and can be displaced inward and outward in the radial direction with respect to the rotating axis 2 x in accordance with the centrifugal force received by the link member 37 (see FIGS. 14 and 16). ) To be rotatable integrally or in conjunction with the rotary shaft 2. Here, it is connected and fixed to the shaft fixing portion 221 so as to be rotatable around a rotation axis 371y orthogonal to both the radial direction (the radial direction in which the corresponding weight member 35 is displaced) and the rotation axis 2x. On the other hand, it connects with the common connection member 36 via the link mechanism 37, and, thereby, the connection member 36 slides on the rotating shaft 2 according to the displacement to the inside and outside in the radial direction of the weight member 35. It is provided as follows.

The link mechanism 37 is moved by a centrifugal force FA that acts more greatly as the rotational speed of the rotary shaft 2 increases. The weight member 35 is located outward as the centrifugal force FA increases, and the weight member decreases as the centrifugal force decreases. The weight member 35 is displaced within a predetermined radial range so that 35 is positioned inward. In this embodiment, as shown in FIG.17 and FIG.19, it has the 1st link member 371 and the 2nd link member 372 which mutually link-link. In the first link member 371 formed in an L shape, the weight member 35 is integrally fixed to one end 371A by a fastening member, and one end 372A of the second link member 372 is fixed to the other end 371B. Are attached to each other in a form having a rotation axis 372y perpendicular to both the rotation axis 2x and its radial direction (radial direction in which the corresponding weight member 35 is displaced). The other end portion 372B of the second link member 372 is attached to the outer peripheral portion of the annular connection member 36 having a disk shape so as to have a rotation axis 373y parallel to the rotation axis 372y. In addition, the bent portion 371C positioned in the middle of the L-shaped first link member 371 is rotatably attached to the shaft fixing portion 221 so as to have a rotation axis 371y that is parallel to the rotation axis 372y. . The shaft fixing portion 221 is fixed integrally with the rotary shaft 2 and is not displaced with the movement of the weight member 35 in the radial direction. The shaft fixing portion 221 is used as a fixed link, and the first link. The member 371 and the second link member 372 are movable.

The urging means 34 is a spring member (a tension spring), and is provided for each blade 30. As shown in FIGS. 17 and 19, the urging means 34 has one end at the blade in the shaft fixing portion 221. While being fixed on the surface opposite to the fixing portion 33, the other end is fixed on the facing surface side of the connecting member 36 facing in the direction of the rotation axis 2x. In the present embodiment, a spring fixing portion 221c (see FIG. 12A) that fixes one end of the spring member 34 is provided on the upstream surface of the shaft fixing portion 221 in the wind receiving direction, and the connecting member 36 is downstream in the wind receiving direction. A spring fixing portion 36c (see FIGS. 14 and 16) for fixing the other end of the spring member 34 is provided on this surface. By providing a pair of

spring fixing portions

221c and 36c in advance at a plurality of locations (here, three locations), it is possible to adjust the urging force by increasing the number of spring members 34.

The connecting member 36 can be integrally rotated with respect to the rotary shaft 2 via the link mechanism 37 and the shaft fixing portion 221 and slides to the first side of the rotary axis 2x due to the radially inward displacement of the weight member 35. The bearing is moved at the center so that it moves (see FIGS. 17 and 18) and slides to the second side of the rotation axis 2x due to the radially outward displacement of the weight member 35 (see FIGS. 19 and 20). It connects with the rotating shaft 2 through the apparatus. Here, the first side is the downstream side in the wind receiving direction (the shaft fixing portion 221 side), and the second side is the upstream side in the wind receiving direction.

The connecting member 36 is directly or indirectly connected to the corresponding blade 30 so that the angle θ is closer to the wind parallel by the sliding movement of the rotation axis 2x toward the first side due to the radially inward displacement of the weight member 35. The pressing member 362 which is pressed against the blade 30 and pulled back directly or indirectly so that the angle θ approaches the wind orthogonal direction by the sliding movement of the rotation axis 2x to the second side due to the radially outward displacement of the weight member 35 is the blade 30 It is provided for each. Thus, the angle θ of each blade 30 is configured to be determined according to the position on the rotation axis of the connecting member 36 that slides as the weight member 35 moves inward and outward in the radial direction. As a result, the angles θ of the blades 30 change in such a manner that they are in synchronism with each other.

Each of the pressing members 362 in FIGS. 17 to 20 is shown as a configuration in which the corresponding blade 30 is directly pressed or pulled back, but in actuality, as shown in FIGS. 12A to 12C, the shaft is fixed. A fixed portion 33A (here, a wind receiving direction) that extends through a through hole 221h formed in the disk-shaped front end portion 221A of the portion 221 and whose extended tip portion is integrally fixed to the corresponding blade 30 It is fixed to a rotation fixing portion 330a) provided on the upstream parallel plate portion 330A so as to be rotatable around an axis parallel to the axis 33z of the rotation support shaft 33Z. Here, the pressing member 362 is fixed so as to be rotatable with respect to the second side far from the rotation support shaft 33Z of the fixing portion 33A.

Moreover, the movable range in the radial direction of the weight member 35 is defined in advance. The state of FIG. 19 is a state in which the weight member 35 is at the radially outermost position, and cannot be displaced further outward in the radial direction due to the configuration of the link mechanism 37. When the weight member 35 reaches the outermost position, the blade 30 reaches a predetermined high-speed rotation angular position B where the width direction W of the wind receiving surface 30w is closest to the wind orthogonal direction (FIG. 21A to FIG. 21). (See FIG. 21C). On the other hand, the state of FIG. 17 is a state in which the weight member 35 is in the radially innermost position and cannot be displaced further inward in the radial direction. However, this is not the innermost position defined by the configuration of the link mechanism 37. That is, the innermost position is the abutting member 38 provided at a position facing the moving direction with respect to the movable structure that operates in conjunction with the angle changing operation of the blade 30 including the blade 30 toward the wind parallel direction. Is defined as a contact position. In the state of FIG. 17 and FIG. 18 and FIG. 21A, the blade 30 is urged toward the wind parallel by the pressing force FW by the wind force and the urging force FB by the urging means 34, but by these forces FW and FB. The operation of changing the angle of the blade 30 toward the wind parallel direction stops when the contact member 38 contacts the movable structure that operates in conjunction with the angle changing operation of the blade 30 including the blade 30. The stop position is the innermost position in the radial direction of the weight member 35, and the position of the blade 30 at the same time is the initial rotation angular position A.

In the present embodiment, each blade fixing portion 33 is fixed to the rotating shaft 2 via a common fixing member fixed so as to be integrally rotatable with the rotating shaft 2, and the fixing member functions as the contact member 38. . Here, the shaft fixing portion 221 is the contact member 38. On the other hand, the connecting member 36 is connected to the link mechanism 37 so as to approach the fixed member as the width direction W of the blade 30 becomes closer to the wind parallel, and functions as the movable structure 39. An extension portion 380 that extends toward the other member is formed on one or both of the shaft fixing portion 221 that is the abutting member 38 and the connecting member 36 that is the movable structure 39. The leading end on the other member side of the protruding portion 380 contacts the contact portion 390 of the other member, so that the blade 30 is held at the angular position A for initial rotation. Here, the connecting member 36 is formed with a cylindrical portion or a protruding portion that extends from the center portion toward the shaft fixing portion 221 as an extending portion 380, and the tip of the connecting member 36 and the shaft fixing portion 221 are formed. The blade 30 is held at the initial rotation angular position A by the contact with the contact portion 390. At least one of the contact portion of the contact member 38 and the contact portion of the movable structure 39 is provided as an elastic member such as rubber. Here, the contact portion 390 of the shaft fixing portion 221 is provided as an elastic member.

By having such a configuration, the blade 30 operates in the form shown in FIGS. 21A to 21C.

That is, when the wind force falls below a predetermined light wind level, as shown in FIG. 21A, the pressing force FW of the wind force to the wind receiving surface 30w of the blade 30 and the urging force FB of the urging means 34 are centrifugal force FA. The weight 30 is pressed inward and the blade 30 is urged and held at the angular position A for initial rotation. More specifically, when the wind force falls below a predetermined light wind level, the movable structure 39 is pressed by the pressing force FW and the urging force FB so as to contact the contact member 38, and at the contact position. The blade 30 is held at a certain initial rotation angular position A. At this time, the width direction of the wind receiving surface of the blade 30 is closest to the wind parallel. This state is a state in which the windmill 3 is easy to obtain a high torque even with a small amount of wind power, and the windmill 3 is easy to rotate. However, it is difficult to obtain a high rotational speed.

When the wind power exceeds the above-mentioned light wind level, as shown in FIG. 21B, the centrifugal force FA starts to increase, and overcomes the pressing force FW on the wind receiving surface 30w and the urging force FB of the urging means 34, The weight member 35 is displaced outward to a position where the FA, FW, and FB are balanced, and the angle θ of the blade 30 also leaves the initial rotation angular position A and changes its position toward the direction perpendicular to the wind. This state is a state in the middle of a transition to a state suitable for higher speed rotation, although it becomes difficult to obtain a higher torque as the position becomes closer to the wind.

However, the outermost position of the weight member 35 is specified. When the wind force reaches a predetermined strong wind level that exceeds the above-described light wind level, the weight member 35 reaches its outermost position and cannot be displaced outward beyond that. At this time, the blade 30 reaches a predetermined high-speed rotation angular position B in which the width direction W is closest to the wind orthogonal direction. This state is a state in which the windmill 3 can rotate at the highest speed.

When the wind power further exceeds the strong wind level, as shown in FIG. 21C, the pressing force FW on the wind receiving surface 30w by the wind force and the urging force FB of the urging means 34 overcome the centrifugal force FA, This time, by pushing back the weight member 35 inward, the blade 30 is returned so that the width direction W is closer to the wind parallel. This state is a state in the middle of the transition of the wind turbine 3 to a state in which it is difficult to obtain a high rotational speed gradually. Here, the blade 30 can be returned to the initial rotation angular position A where the movable structure 39 contacts the contact member 38.

As described above, according to the present embodiment, by having the biasing means 34, the weight member 35, and the link mechanism 37, the first stage in which the angle θ of the blade 30 is close to the wind parallel so that the blade 30 can be easily rotated in a light wind. And the second stage in which the angle θ of the blade 30 is close to the wind orthogonal so that high rotation is likely to occur when the wind speed increases, and the blade 30 from the wind orthogonal to the wind parallel so that over-rotation is prevented in a strong wind. It is possible to vary the angle θ of the blade 30 in the three stages of being pushed back, and the wind turbine 3 is excellent in starting performance by autonomous rotation speed control by changing the angle of the blade 30 in the three stages. Moreover, the efficiency at the time of high rotation is high, and the excessive rotation at the time of strong wind can be suppressed.

Although one embodiment of the present invention has been described above, this is merely an example, and the present invention is not limited to this, and the knowledge of those skilled in the art can be used without departing from the spirit of the claims. Various modifications based on this are possible.

Further, the angle adjustment mechanism 300 in the above embodiment can be modified as follows.

That is, in the angle adjustment mechanism 300 in the above embodiment, as the urging means 34, the width direction W of the wind receiving surface 30w of the blade 30 is positioned between the initial rotation angular position A and the high speed rotation angular position B. The spring member 34 is used to urge the blade 30 toward the angle position A for initial rotation with a constant urging force so that the width direction W is closer to the wind parallel side. The biasing force that biases the width direction W of the wind surface 30w toward the initial rotation angular position A may be changed to increase as the distance from the initial rotation angular position A increases. Hereinafter, an angle adjustment mechanism 300 'and a windmill 3' different from those in the above embodiment will be described with reference to FIGS.

FIG. 24 shows a windmill 3 'different from the windmill 3 of the above embodiment. 25A is an enlarged partial sectional view of one plate fixing portion in FIG. 24, FIG. 25B is a sectional view taken on line AA in FIG. 25A, and FIG. 25C is a simplified sectional view taken on line BB in FIG. It is a schematic diagram. However, the angle θ formed by the width direction W of the blade 30 and the direction of the rotation axis 2x differs between the left side and the right side of FIGS. 25B and 25C. The left side of FIGS. 25B and 25C shows the blade 30. 25B and FIG. 25C show the state where the blade 30 is close to the wind parallel.

As shown in FIGS. 25A to 25C and FIGS. 26 to 29, the angle adjusting mechanism 300 ′ of the wind turbine 3 ′ shown in FIG. 24 is replaced with the spring member 34 used as the biasing means in the embodiment of FIG. The difference is that magnets (magnetic members) 340a and 340b such as neodymium magnets are used. The magnet 340b includes a blade (movable structure) 30 capable of varying an angle θ between the width direction W of the wind receiving surface 30w (see FIGS. 30A to 30C and FIG. 31) and the direction of the rotation axis 2x of the rotation shaft 2. It is attached upstream of the wind receiving direction. More specifically, of the

parallel plate portions

330A and 330A constituting the blade attachment member (movable structure) 330 for attaching the blade 30, it is directly fixed to the parallel plate portion 330A on the upstream side in the wind receiving direction by a fastening member. On the other hand, the magnet 340a is attached to a shaft fixing portion (fixed structure portion) 221 that approaches the parallel plate portion 330A (blade 30), to which the magnet 340b is attached, closer to the wind direction, so as to face the magnet 340b. . Specifically, the shaft fixing portion (fixed structure portion) 221 is directly fixed to the downstream side in the wind receiving direction by the fastening member. The opposing magnets (magnetic members) 340a and 340b have the same polarity, and generate a repulsive force FM (see FIGS. 30A to 30C and 31) that prevents the mutual approach when approaching. The repulsive force FM increases as the distance between the opposing magnets (magnetic members) 340a and 340b decreases.

By having such a configuration, the blade 30 operates in the form as shown in FIGS. 30A to 30C and FIG.

That is, when the wind force falls below a predetermined light wind level, as shown in FIG. 30A, the pressing force FW on the wind receiving surface 30w of the blade 30 by the wind force and the urging force FM of the urging means 340a and 340b are centrifuged. The blade 30 is biased and held at the initial rotation angular position A by overcoming the force FA and pressing the weight member 35 inward. More specifically, when the wind force falls below a predetermined light wind level, the movable structure 39 is pressed by the pressing force FW and the urging force FB so as to contact the contact member 38, and at the contact position. The blade 30 is held at a certain initial rotation angular position A. At this time, the width direction of the wind receiving surface of the blade 30 is closest to the wind parallel. This state is the same as FIG. 21A, but here the urging force FM is the repulsive force of the

magnets

340a and 340b, and here the distance between the opposing surfaces of the

magnets

340a and 340b is long, so the urging force FM is It is much smaller than the urging force FB at 21A and acts as an extremely small force.

When the wind force exceeds the above-described light wind level, as shown in FIG. 30B, the centrifugal force FA starts to increase, and the pressing force FW to the wind receiving surface 30w and the urging force FM of the urging means 340a and 340b are increased. The weight member 35 is overcome and displaced outward to a position where the FA, FW and FM are balanced, and the angle θ of the blade 30 also leaves the initial rotation angular position A and changes its position toward the wind orthogonal position. This state is the same as FIG. 21B, but the biasing force FM here is still much smaller than the biasing force FB.

When the wind power reaches a predetermined strong wind level that exceeds the above-described light wind level, the blade 30 has a width direction W closer to the wind orthogonal to the initial rotation angular position A as shown in FIG. 30C. It will be in the state which reached | attained the predetermined angular position B for high speed rotation. This state is a state in which the windmill 3 can rotate at the highest speed. At this stage, the distance between the facing magnets (magnetic members) 340a and 340b facing each other becomes smaller, so that the urging force FM gradually increases to have a function as the urging force.

When the wind power further exceeds a predetermined strong wind level, as shown in FIG. 31, the centrifugal force FA further increases, and the angle θ of the blade 30 exceeds the angular position B for high-speed rotation. This is the Y side position. In the range of the angle θ of the blade 30 beyond the angular position B for high-speed rotation (hereinafter referred to as “rotational deceleration angle range”) Q, the blade 30 that has been a positive pitch until now has a negative pitch, The reverse rotational force is generated. That is, the blade 30 is configured to rotate in a predetermined constant rotation direction that receives the wind force from the wind receiving direction 2w and rotates. However, the angular position B for high-speed rotation is set by changing the angle θ of the blade 30. If it exceeds, the reverse direction rotational force which tries to rotate in the direction opposite to the constant rotational direction is generated. The reverse direction rotational force increases as the distance from the high-speed rotation angular position B increases within the rotation deceleration angular range Q. For this reason, the blade 30 positioned in the rotation deceleration angle range Q is in a state in which the rotation in the constant rotation direction is braked, the rotation speed is reduced, and accordingly, the centrifugal force FA of the weight member 35 is also reduced. To do. On the other hand, the urging force FM of the urging means 340a, 340b increases as the blade 30 located in the rotation deceleration angular range Q moves away from the high-speed rotation angular position B. For this reason, the blade 30 positioned in the rotation deceleration angular range Q is again pushed back to the high-speed rotation angular position B, and the FA at that time, and the FW and FM are in a balanced position.

As described above, the angle adjusting mechanism 300 ′ includes the urging means 340a and 340b, the weight member 35, and the link mechanism 37, so that the angle θ of the blade 30 is made closer to the wind parallel so that it can be easily rotated in a light wind. One stage, a second stage in which the angle θ of the blade 30 is close to the direction perpendicular to the wind so that high rotation is likely to occur when the wind speed increases, and an angle θ of the blade 30 for rotational deceleration so that over-rotation is prevented during strong winds. It is possible to vary the angle θ of the blade 30 in the three stages of reaching the angle range. By the autonomous rotational speed control by changing the angle of the blade 30 in the three stages, the wind turbine 3 ′ It has excellent startability, high efficiency at high rotation, and suppression of excessive rotation during strong winds.

The angular position B for high-speed rotation of the blade 30 in FIGS. 21A to 21C already described is located before reaching the wind orthogonal plane Y, which is the maximum value of the centrifugal force FA or a constant urging force FB. The true angular position for high-speed rotation at which the wind turbine can rotate at the highest speed is located on the wind orthogonal plane Y side further than the movable limit position. Good. However, as shown in FIGS. 21A to 21C, the movable limit angle position of the blade 30 defined by the maximum value of the centrifugal force FA and the magnitude of the constant urging force FB is a position D that coincides with the wind orthogonal plane Y. It is most desirable in terms of rotational performance that the position D is an angular position for high-speed rotation. On the other hand, in the embodiment described with reference to FIGS. 30A to 30C and FIG. 31, even if the angular position of the blade 30 exceeds the position B as shown in FIG. Here, the movable limit angle position of the blade 30 exists at a position on the back side of the wind orthogonal plane Y in a form defined by the magnitude of the magnetic force (magnetic repulsive force) of the

magnets

340a and 340b. .

The blade 30 employed in this embodiment (magnet specification) may adopt the shape shown in FIGS. 2 to 8 in the above embodiment (spring specification). The shape is different from that of the shape. Specifically, the top view (plan view) and the bottom view (bottom view) of the blade 30 shown in FIGS. 7 and 8 are changed so as to be visually recognized as shown in FIGS. 22 and FIG. 23, when the blade 30 is viewed from the same viewpoint as in FIGS. 2 to 6, a difference in appearance appears, but the difference is only a subtle difference. Since it is visually recognized in the same manner as in FIGS. 2 to 6, the illustration is omitted.

The blade 30 employed in the wind turbine of the wind power generator according to the present invention receives a wind force from the wind receiving direction 2w and rotates in a constant rotation direction so that a difference in flow speed occurs between the rotating shaft 2 side and the tip side. Thus, the wind receiving surface 30w is formed in a form in which a twist is applied from the rotating shaft 2 side to the tip side. In the embodiment already described, as shown in FIGS. 2 to 8, the wind receiving surface 30w is configured such that the blade 30 is moved from the opposite side in the rotational direction with the width direction W of the blade 30 positioned on the wind orthogonal surface Y. When viewed (see FIG. 8), it can be seen while the surface width decreases from the rotating shaft 2 side to the tip side, and conversely, the width direction W of the blade 30 is positioned on the wind orthogonal surface Y. When the blade 30 is viewed from the rotational direction side in this state (see FIG. 7), the torsional shape is invisible. In this case, even if the angular position of the blade 30 changes between the position A and the position B, the wind receiving surface 30w can always be seen when the blade 30 is viewed from the opposite side of the rotation direction, and the blade 30 can be viewed from the rotation direction side. The wind receiving surface 30w cannot always be visually recognized (plus pitch). Therefore, when the blade 30 receives wind force from the wind receiving direction 2w, the wind force acts in such a manner as to press the wind receiving surface 30w viewed from the opposite side of the rotation direction, and always obtains rotational force in a constant rotation direction. Rotate.

On the other hand, when the blade 30 employed in this embodiment is viewed from the opposite side in the rotational direction with the width direction W located on the wind orthogonal surface Y (see FIG. 23), the wind receiving surface 30w is The shape is such that it is visible only to an intermediate position on the way from the rotary shaft 2 side to the tip side. From the intermediate position to the outside, this time, when the blade 30 is viewed from the rotational direction side in the same state (FIG. 22). Reference) The wind receiving surface 30w has a torsional shape so that the wind receiving surface 30w can be visually recognized on the tip side of the blade 30. In this case, the blade 30 has a wind receiving surface when the blade 30 is viewed from the opposite side in the rotational direction in a state where the width direction W is positioned at a position B slightly before the position A on the wind orthogonal surface Y. Although 30w is visually recognized and the wind receiving surface 30w is not visually recognized when viewed from the rotation direction side (plus pitch), when the position B is exceeded, the wind receiving surface 30w is visually recognized on the tip side when viewed from the rotation direction side. (Minus pitch). For this reason, in the state where the blade 30 is located at the position B, the wind turbine 3 ′ can rotate at the highest speed, but reaches the angle range (rotational deceleration angular range) Q beyond the position B. Then, when the wind force is received from the wind receiving direction 2w, the wind force acts in such a manner as to press the wind receiving surface 30w that is visually recognized when the blade 30 is viewed from the opposite side of the rotation direction, and in the constant rotation direction. In addition to rotating with the rotational force, the wind force acts on the wind receiving surface 30w that is visually recognized when the blade 30 is viewed from the rotation direction side, so that it is opposite to the constant rotation direction. The rotational force is also obtained. As a result, the blade 30 enters a decelerated rotation state in which the brake is acting. When the blade 30 exceeds the position B, the wind receiving surface 30w can be visually recognized from the front end side when viewed from the rotational direction side. The area increases in such a way that the wind receiving surface 30w can be visually recognized, and the reverse rotational force increases.

In addition, the

angle adjustment mechanisms

300 and 300 ′ in the above embodiment can be modified into shapes as shown in FIGS. 32 and 33.

32 is a modification of the angle adjustment mechanism 300 described with reference to FIGS. 11 to 20 and FIGS. 21A to 21C. In the angle adjustment mechanism 300 of FIG. 32, the biasing means 34 ′ forming a spring member has one end fixed to a movable structure (here, a blade mounting member) 330, and the other end similarly as described above. A compression spring fixed to a similar fixed structure (here, a shaft fixing portion) 221 and movable toward the fixed structure 221 as the blade 30 is displaced from the initial rotation angular position A in the direction perpendicular to the wind. It acts by pushing back the structure 36.

FIG. 33 is a modification of the angle adjustment mechanism 300 described with reference to FIGS. In the angle adjusting mechanism 300 of FIG. 33, one of the magnets 340b ′ of the biasing means 340a ′ and 340b ′ forming a magnet is fixed to the movable structure (here, a connecting member) 36 similar to the above, and the other The magnet 340b is fixed to a fixing structure (here, a shaft fixing portion) 221 similar to the above, and the

magnets

340a and 340b are arranged in such a manner that different poles face each other. As a result, a suction force is generated on the movable structure 330 that is separated from the fixed structure 221 as it is displaced from the initial rotation angular position A in the direction perpendicular to the wind, and acts to prevent the separation.

DESCRIPTION OF SYMBOLS 1 Wind power generator 2 Rotating shaft 2x Rotating axis 2w Wind receiving direction 3 Windmill 30 Blade (wing)
30w Wind receiving surface 30v Back of blade 30T Blade body (wing body)
30S Blade tip (wing tip)
300 Angle adjustment mechanism (blade angle adjustment mechanism)
33 Blade fixing part (wing fixing part)
33A, 33B Fixed portion 33Z Rotating support shaft 34 Biasing means 340a, 340b Biasing means 35 Weight member 36 Connecting member 362 Pressing member 37 Link mechanism 100 Power generation case body W Blade width direction θ Blade width direction and axis of rotation axis X direction parallel to wind direction Y wind orthogonal plane A angular position for initial rotation B angular position for high speed rotation FW Pushing force applied to blade by wind force FA Centrifugal force (centrifugal force by link mechanism 37 in rotation axis 2x Converted force)
FB Biasing force of urging means (spring member) FM Biasing force of urging means (magnetic member)

Claims

A wind turbine blade for a wind turbine generator that is provided at least two around the rotation axis so as to receive wind force from the axial direction of the rotation axis and rotate around the rotation axis in a constant rotation direction,
A wind power generator comprising: a blade main body extending radially outward with respect to the rotation shaft; and a blade tip extending from the outside of the blade main body to the opposite side to the constant rotation direction. Windmill wing for equipment.
When the wind receiving surface side is the front side, the blade tip portion is formed in a shape that appears to bend and continue from the outside of the straight blade body portion in front view and rear view. A wind turbine blade for the wind turbine generator according to claim 1.
When the constant rotation direction side is the upper side, the blade tip portion is bent toward the wind receiving surface side of the blade body portion with respect to the extending direction of the blade body portion in a top view and a bottom view. Item 3. A wind turbine blade for a wind turbine generator according to item 1 or 2.
The wind turbine blade for a wind turbine generator according to claim 3, wherein the wind receiving surface of the blade main body has a shape that warps toward the wind receiving direction as it extends outward in the extending direction of the blade main body.
The wind turbine blade for a wind turbine generator according to any one of claims 1 to 4, wherein the blade tip is formed in a form that continues smoothly and continuously from the outer periphery of the blade body.
The wind turbine blade for a wind turbine generator according to any one of claims 1 to 5, wherein the wind receiving surface has a shape in which the width of the wind receiving surface decreases toward the outer peripheral side tip.
A wind turbine for a wind turbine generator having three blades according to any one of claims 1 to 6 at regular intervals around the rotation axis.