WO2003076802A1

WO2003076802A1 - Blade and auxiliary member of wind power generator, and wind power generator

Info

Publication number: WO2003076802A1
Application number: PCT/JP2002/004211
Authority: WO
Inventors: Kenzo Kanki; Hareyuki Nishida
Original assignee: Kenzo Kanki; Hareyuki Nishida
Priority date: 2002-03-13
Filing date: 2002-04-26
Publication date: 2003-09-18
Also published as: JP2003269320A; AU2002253611A1

Abstract

A blade used for the windmill of a wind power generator capable of increasing a power generating efficiency at a rather low wind velocity and preventing excessive rotation of the windmill while assuring the power generating efficiency at a rather high wind velocity, comprising a blade body (22) having a camber and rotatably fitted to the rotating shaft of the windmill and an auxiliary member (23) installed at the rear end of the blade body in the rotating direction of the blade body so as to be extended therefrom, wherein the auxiliary member is formed in a first shape capable of increasing the camber of the blade and the projected area of the blade on the rotating surface of the windmill and, when a wind force is increased, deforms from the first shape to a second shape capable of reducing the camber of the entire blade to the same level as the camber of the blade body and, when the wind force is decreased, returns to the first shape.

Description

Specification

Wind turbine generator blade, auxiliary member, and wind turbine generator

[Technical field]

The present invention relates to a blade used for a wind turbine of a wind power generator, an auxiliary member of the blade, and a wind power generator.

[Background technology]

Various blades of wind turbines have been studied, and so-called thick-wing blades of propeller type wind turbines are often used. The appropriate shape of the blade can be obtained by calculation according to the desired amount of power generation, stall wind speed, windmill size, and the like. When the wind speed increases beyond the stall wind speed, the stall phenomenon occurs due to the air characteristics provided by the blade shape. As a result, the rotation speed is reduced, and the overturn of the wind turbine is prevented.

The greater the camber in a certain area, the greater the lift, the higher the rotation speed and the higher the power generation efficiency. The larger the projected area of the blade on the rotating surface of the wind turbine, the more the wind turbine can start (cut in) at a lower wind speed. Here, the lift force is a force which is orthogonal to the direction of wind and the speed of the blade relative to the blade determined by the direction and speed of the wind and the direction of the wind. Is the force from the wind receiving side (front side) to the opposite side (back side). However, as the wind speed increases, the larger the blade camber, the more likely the windmill will over-rotate, rotating beyond the capacity of the generator and possibly damaging the blade. Therefore, there is one that actively controls (pitch control) the mounting angle (pitch angle) of the blade by a mechanical configuration.

However, mechanically changing the pitch angle of the blade has a problem in that the configuration is complicated.

Wind power generators with blades that can be changed by wind power

No. 3,071,880 discloses this. The wind power generator 100 in the publication is a Dutch windmill, as shown in FIG. A blade 93 is attached to a wind shaft 92 extending from a rotation shaft 91 of the wind turbine 90 of the power generator 100 in a direction orthogonal to the rotation shaft 91. The blade 93 is located near the boundary with the wind shaft 92. And an elastic deformation portion 93a formed of a superelastic alloy material. When the wind speed increases, the elastically deforming portion 93a is deformed by the increased wind force, thereby preventing the windmill 90 from over-rotating. The gazette also shows a blade 93 entirely formed of a superelastic alloy material.

However, since the elastic deformation portion 93a of the blade 93 is located near the boundary with the wind shaft 92, when the elastic deformation portion 93a deforms, the angle of the entire blade with respect to the wind changes. Therefore, when the wind speed is high, the power generation efficiency is significantly reduced. Also, since the elastically deformable portion 93a is formed integrally with the blade 93 and cannot be separated, the elastically deformable portion 93a cannot be applied to an existing blade, and the blade 93 must be newly formed. is there.

In the blade 93 formed entirely of a superelastic alloy material, when the wind speed is high, the entire blade is deformed, so that the power generation efficiency is significantly reduced. In addition, since the entire blade is formed of a superelastic alloy material, the cost is high and the blade is heavy and difficult to rotate.

[Disclosure of the Invention]

An object of the present invention is to improve the power generation efficiency at a relatively low wind speed, and at the same time, to secure the power generation efficiency at a relatively high wind speed while preventing the wind turbine from over-rotating, an auxiliary member, and An object of the present invention is to provide a wind power generator.

In order to achieve the above object, according to a first aspect of the present invention, there is provided a blade body having a camber and rotatably attached to a rotation shaft of a wind turbine, and a rear end of the blade body in a rotation direction of the blade body. The present invention provides a blade for use in a wind turbine of a wind power generator, including an auxiliary member provided to extend from a blade main body. The auxiliary member has a first shape that increases the camper of the blade and increases the projected area of the blade on the rotating surface of the windmill. The auxiliary member deforms from the first shape when the wind power increases, to a second shape that reduces the camper of the entire blade to the same degree as the camber of the blade body, and when the wind power decreases, the first shape Return to

The blade body has a shape determined according to the size of the windmill, the stall wind speed, and the amount of power generation, and the auxiliary member is preferably detachable from the blade body. The rear end of the blade body is preferably detachable from the blade body.

It is preferable that the rear end of the blade body and the auxiliary member are formed as a body. The back surface of the auxiliary member opposite to the front surface receiving the wind, and the back surface opposite to the front surface of the blade body receiving the wind. It is preferable that the auxiliary member is attached to the rear end of the blade body so that the operation is smoothly continued.

The auxiliary member preferably has a slope that is continuous with the back surface of the blade body. The rear end of the blade body has a step portion for attaching the auxiliary member, and the back surface of the auxiliary member is the blade body. It is preferable to be attached to the step so as to be flush with the back surface.

Preferably, the auxiliary member is attached over the entire length of the blade body.

It is preferable that the length of the auxiliary member is shorter than the length of the blade main body, and the auxiliary member is provided at least on a radially outer portion of the blade main body when the blade main body is attached to the wind turbine.

The capture member is preferably one of a plurality of auxiliary members attached in the longitudinal direction of the blade body. Adjacent trapping members are preferably arranged at predetermined intervals. Preferably, the predetermined interval has a distance such that a change in airflow due to deformation of the radially outer auxiliary member of the blade does not interfere with the radially inner auxiliary member of the blade.

The auxiliary member preferably includes a plurality of materials each having a different coefficient of thermal expansion, and it is preferable that at least one of the plurality of materials be electrically conductive.

The blade of the wind power generator, wherein an extension amount of the auxiliary member extending rearward from the blade main body is not more than 20% of a width of the blade main body.

According to a second aspect of the present invention, there is provided a blade body having a camber and rotatably attached to a rotating shaft of a wind turbine; An auxiliary member provided; PC Lan Hire 11

Provided is a blade for use in wind turbines of electrical equipment. The auxiliary member is detachable from the blade main body, and flexibly deforms in response to wind force.

According to a third aspect of the present invention, there is provided an auxiliary member which is used in a wind turbine of a wind turbine generator, is attached to a blade body having a camber, and forms a blade together with the blade body. The auxiliary member increases the camber of the whole blade in a state where the auxiliary member extends from the blade main body to the rear end portion of the blade main body in the rotation direction of the blade main body, and further increases the camber of the blade to the rotation surface of the windmill. It has a first shape that increases the projected area. The auxiliary member deforms from the first shape when the wind power increases, to a second shape that reduces the camper of the entire blade to the same degree as the camper on the blade body, and changes to the first shape when the wind power decreases Return.

According to a fourth aspect of the present invention, there is provided an auxiliary member which is attached to a blade main body used in a wind turbine of a wind turbine generator and forms a blade together with the blade main body. The auxiliary member is flexibly deformed in response to wind force when it is attached to the rear end of the blade body in the direction of rotation of the blade body so as to extend from the blade body.

According to a fifth aspect of the present invention, there is provided a wind power generator including: a generator having a rotor shaft; and a windmill having a blade attached to the rotor shaft and rotating the rotor shaft by wind pressure. The blade has a camber and is rotatably mounted on the rotor shaft. An auxiliary member is provided at the rear end of the blade body in the direction of rotation of the blade body, extending from the blade body. And The auxiliary member has a first shape that increases the camber of the blade and increases the projected area of the blade on the rotating surface of the windmill. The auxiliary member deforms from the first shape when the wind power increases to a second shape that reduces the camber of the entire blade to the same degree as the camber of the blade body, and changes to the first shape when the wind power decreases Return.

[Brief description of drawings]

For a better understanding of the present invention, together with the objects and features of the present invention, reference is made to the following description of exemplary embodiments in conjunction with the accompanying drawings.

FIG. 1 is a schematic perspective view of a conventional wind turbine generator. FIG. 2 is a schematic perspective view of a wind turbine generator according to one embodiment of the present invention. FIG. 3 is a schematic side view of a blade of the wind turbine generator of FIG.

FIG. 4 is a schematic explanatory diagram of the experimental apparatus.

Figure 5 is a graph showing the experimental results.

FIG. 6A is a schematic perspective view of another blade.

FIG. 6B is an exploded perspective view of the blade of FIG. 6A.

FIG. 7 is a schematic sectional view of another blade.

FIG. 8 is a schematic perspective view of another blade.

[Best Mode for Carrying Out the Invention]

FIG. 2 is a schematic perspective view of a wind power generator 11 according to one embodiment of the present invention, and the wind power generator 11 has a propeller-type wind turbine. FIG. 3 is a schematic side view of the blade 21.

As shown in FIG. 2, the wind turbine generator 11 includes a fixed part 12 fixed to the ground, and a pillar 13 erected on the fixed part 12, which is a metal pipe. At the upper end of the support 13, a support case 14 rotatable with respect to the support 13 is arranged. The generator 16 is attached to the upper part of the support case 14. The generator 16 has a rotor shaft 18 extending horizontally. A windmill 20 is attached to the rotor shaft 18, and the windmill 20 and the rotor shaft 18 rotate integrally. The support case 14 is provided with tail fins 14a that rotate the support case 14 by wind and always direct the windmill 20 to the windward direction.

Three blades 21 are attached to the windmill 20 at intervals of 120 °. In this embodiment, the wind turbine 20 is formed so as to rotate in the counterclockwise direction (rotation direction R) in FIG.

The front of the blade 21 is on the rotation direction R side of the windmill 20, and the rear of the blade 21 is on the side opposite to the rotation direction R of the windmill 20. The surface 2 2 b of the blade 21 receives wind. The blade 21 includes a blade body 22 which is a propeller blade and an auxiliary member 23. The auxiliary member 23 is attached to the rear end of the blade main body 22. The blade main body 22 is formed to have a constant cross section over its longitudinal direction. Blade body 22 is attached to the windmill 20 so that its camber is convex on the back side. The shape of the blade body 22 is suitably formed according to the size of the windmill, the stall wind speed, and the amount of power generation. The blade body 22 is formed of fiber-reinforced plastic in the present embodiment.

The catching member 23 has a flat plate shape, and is attached to the blade main body 22 so as to extend rearward of the blade main body 22 along the back surface 22 a of the blade main body 22. At this time, the auxiliary member 23 has the first shape. The auxiliary member 23 is attached to the blade body 22 by screwing the port 24 into a nut (not shown) arranged in a cavity in the blade body 22 (see FIG. 3). The catching member 23 has a slope 2 connected to the back surface 2 2 a of the blade body 22 at its front end so that its back surface 23 a follows the sliding force with the back surface 22 a of the blade body 22. Has 3b. The auxiliary member 23 has flexibility and is flexibly deformed according to wind pressure. In the present embodiment, the auxiliary member 23 is formed of fiber reinforced plastic. The fiber-reinforced plastic is, for example, a carbon fiber reinforced plastic or a Porone fiber reinforced plastic.

Next, the operation of the wind power generator 11 will be described.

In the state where the wind is blowing, the support case 14 is rotated by the tail fins 14a, and the windmill 20 is directed to the windward direction. The projected area of the blade 21 onto the rotation surface S (see FIG. 3) of the windmill 20 is increased by the auxiliary member 23 compared to the case where only the blade body 22 is used. Therefore, the windmill 20 is started at a lower wind speed than without the auxiliary member 23. The center of the rotation surface S of the windmill 20 is the rotor shaft 18.

As shown in FIG. 2, the portion r (the portion of the turning radius r) from the center of rotation of the rotor shaft 18 in the blade 21 is at a speed proportional to the turning radius r, and moves within the rotation plane S of the wind turbine 20. Rotate. In FIG. 3, the speed component in the section of the rotation speed of the blade 21 at the rotation radius r is indicated by the moving speed U r. Based on the wind speed W and the moving speed Ur, a wind having a relative wind speed Vr is apparently blowing at a portion of the turning radius r of the blade 21. Due to the relative wind speed V r, the portion of the turning radius r of the blade 21 is orthogonal to the relative wind speed V r, and the force (lift force) from the front surface 22 b of the blade 21 to the back surface 22 b Lr occurs. Blade 2 1 Overall lift is lift Lr It is a sum. The blade 21 moves and the windmill 20 rotates due to the rotational direction component of the lift.

The entire camber of the blade 2 1 is the blade body without the auxiliary member 23

2 Greater than just 2 Therefore, the lift of the blade 21 is increased as compared with the case of the blade body 22 alone. Due to the increase in lift, the rotation speed of the windmill 20 increases, and the power generation efficiency of the generator 16 is improved.

Due to an increase in the relative wind speed Vr with an increase in the wind speed, the auxiliary member 23 bends in the direction of the relative wind speed Vr as shown by the two-dot chain line in FIG. 3 (second shape). Even when the auxiliary member 23 is radiused, the projected area of the blade 21 on the rotation surface S of the windmill 20 hardly changes. By the force of the auxiliary member 23, the camber of the blade 21 is reduced to the same extent as that of the blade body 22 alone. Due to the reduced number of campers, the lift of the blade 21 is reduced to a level comparable to that of the blade body 22 alone. Therefore, over rotation of the windmill 20 is prevented. Since the blade body 22 does not deform, the power generation efficiency of the generator 16 is ensured, and a significant decrease in power generation efficiency is prevented. When the wind speed decreases, the radiused auxiliary member 23 returns to a state (first shape) extending along the rear surface 22 a again. Therefore, the campers of the blades 21 are regenerated and the lift is increased, and the power generation efficiency of the generator 16 is improved.

Next, experimental examples of the present embodiment will be described, but the present invention is not limited thereto.

As shown in FIG. 4, the wind tunnel device 31 is arranged in front of the wind power generation device 11. The wind tunnel device 31 includes a cylindrical wind tunnel 32, and a blower 33 is provided at an opening on the upstream side. The number of rotations per second of the blower 33 is synchronized with the frequency of the drive current. The power supply device 34 has an inverter, and the frequency of the drive current is changed by the inverter. The blower 33 generates, for example, a wind having a wind speed of 1.1 O m / s when the frequency of the drive current is 6 OH _Z , and a wind speed of 5.5 m / s when the frequency is 3 OH z. Have. At the downstream opening of the wind tunnel 32, a rectifier plate 35 is provided.

3 5 rectifies the air flow to be sent out. A voltmeter 36 for measuring the generated voltage is connected to the generator 16.

The blade body 2 2 has an airfoil of NA CA 2 4 1 2 and a length of 15 O mm It has a width (chord) of 42 mm and a maximum thickness of 5 mm.

A radially inner end 22d of the blade body 22 is mounted at a position of 18 to 20 mm from the rotor shaft 18. The auxiliary member 23 is made of brass, has a thickness of 0.01 mm, and has a length substantially equal to the length of the blade 21. The experiment was performed by changing the amount of the auxiliary member 23 extending rearward from the blade 21 as follows.

[Example 1] Omm; When there is no auxiliary member 23

[Example 2] 4 mm

[Example 3] 5 mm

[Example 4] 6 mm

[Example 5] 7mm

[Example 6] 8 mm

[Example 7] 10 mm

In each of Experimental Examples 1 to 7, the wind turbine 20 was started (cut in) by blowing air to the stopped wind turbine 20 by the wind tunnel device 31. Next, the wind speed was increased by increasing the frequency of the power supply unit 34 by 1 Hz, and the generated voltage (V) of the generator 16 for each wind speed was measured by the voltmeter 36. Table 1 shows the experimental results, and Fig. 5 shows the experimental results.

In the case of [Example 5] and [Example 6], the shape of the graph was similar, so only the case of [Example 5; extension = 7mm] is shown in the graph. Table 2 shows the improvement rate (%) of the power generation voltage when the auxiliary member 23 is attached to the case of [Example 1; no auxiliary member 23], corresponding to Table 1. At wind speeds of 3.85 mZs or less, the power generation voltage (V) of [Example 2] to [Example 7] is shown as it is because the wind turbine has not yet been started in [Example 1]. [Table 1] Wind speed auxiliary part 4itm 5mm 6mm 7mm 8 countries 10 discussions (m / s) No material

2.93 0 0 0 0 0 0 0

3.12 0 0 0 0 0 0 0

3.30 0 0 0 0 2.32 0 0

3.48 0 0 0 0 2.54 2.54 0

3.67 0 2.57 2.62 2.68 2.70 2.71 2.66

3.85 0 2.77 2.88 2.90 2.92 2.94 2.90

2.85 3.00 3.05 3.10 3.16 3.14 3.08

A 00 3.00 3.12 3.25 3.30 3.32 3.30 3.25

(A AC) 3.15 3.28 3.43 3.44 3.46 3.49 3.44

A 5ft 3.33 3.45 3.60 3.65 3.66 3.67 3.61

A 77 3 5 ^ 3.67 3.82 3.83 3.86 3.86 3.84

4 or; 3, 70 3.83 4.00 4.00 4.00 4.05 4.00

3 86 4.00 4.20 4.18 4.17 4.22 4.12

4 03 4 20 4.33 4.38 4.35 4.40 4.30

4 ・ 20 4.38 4.53 4.52 4.50 4.56 4.42

4.38 4.58 4.70 4.70 4.70 4.70 4.50 ς Q7 4.56 4.80 4.85 4.86 4.82 4.85 4.62

4.73 4.90 4.99 5.00 5.00 5.00 4.65 β 23 4.88 5.07 5.20 5.16 5.20 5.13 4.75

6-42 5.00 5.20 5.35 5.30 5.30 5.25 4.76

6.60 5.25 5.44 5.48 5.50 5.45 5.45 4.80

6.78 5.40 5.60 5.60 5.60 5.52 5.52

6.97 5.60 5.79 5.80 5.80 5.73 5.71

7.15 5.77 6.00 5.90 5.95 5.82 5 88

7.33 5.90 6.12 6.10 6.10 5.50 5.50

7.52 6.10 6.27 6.28 5.65 5.50 5.50

7.70 6.22 6.40 6.40 5.65

7.88 6.35 6.55 6.53

8.07 6.50 6.70 6.70

8.25 6.60 6.80 6.80

8.43 6.75 6.85 6.85

[Table 2]

As shown in Table 1, Table 2, and FIG. 5, by attaching the auxiliary member 23, the power generation voltage could be improved more than in the case of [Example 1]. In the case of [Example 2], the generated voltage could be improved, but the rate of increase of the generated voltage was smaller than in other cases where the extension was larger. In the case of [Example 7], the catching member 23 was bent at a wind speed lower by about 2 m / s than in the cases of [Example 4] to [Example 6]. The generation voltage improvement rate was the largest in [Example 5] and [Example 6].

The force-in wind speed (starting wind speed) was lower when the auxiliary member 23 was provided than in [Example 1], and it started at 3.30 mZs in [Example 5]. The following was confirmed by the experiment. By attaching the flexible auxiliary member 23 having an appropriate amount of extension, the power generation efficiency can be improved, and the auxiliary member 23 bends at a relatively high wind speed. Rotation can be prevented.

The wind turbine generator 11 of the present embodiment has the following advantages.

(1) By attaching the catching member 23 to the rear end of the blade body 22, the camber of the entire blade 21 increases at a relatively low wind speed, and the power generation efficiency improves. The auxiliary member 23 increases the projected area of the blade 21 onto the rotating surface S of the windmill 20. Therefore, the windmill 20 starts at a relatively lower level and wind speed than when only the blade body 22 is used (cut-in). it can. At a relatively high wind speed, the catching member 23 is bent by the wind force, so that the camper of the blade 21 is reduced to about the same level as when the blade body 22 alone is used. Although the auxiliary member 23 is bent, the blade body 22 is not deformed. Therefore, when the wind speed is relatively high, the windmill 20 is prevented from over-rotating while securing the desired power generation efficiency. That is, it is possible to improve the power generation performance at a wind speed lower than the stall wind speed while maintaining the stall wind speed as it is.

(2) The auxiliary member 23 can be separated from the blade body 22. Therefore, the auxiliary member 23 can be retrofitted to an existing blade whose shape is determined in advance according to the size of the windmill, stall wind speed, power generation amount, and the like. Using existing blades, the camber of the entire blades can be increased at relatively low wind speeds to improve lift and improve power generation efficiency. Therefore, for example, even if a blade designed to correspond to a place where relatively high-speed wind blows constantly in Europe is used in a place where relatively low-speed wind blows such as Japan, the catching member 23 is attached to the blade. By attaching it, sufficient lift can be obtained and the desired power generation efficiency can be secured.

(3) Since the auxiliary member 23 is attached to the blade body 22 by the port 24, it can be easily attached. If the auxiliary member 23 is deformed due to long-term use, it can be easily removed and replaced.

(4) The auxiliary member 23 has a slope 23b at the front end, and is attached to the blade body 22 such that the back surface 23a is continuous with the back surface 22a of the blade body 22. . Therefore, it is possible to smooth the air flow and prevent a decrease in lift. 02 04211

1 2

(5) The auxiliary member 23 is attached over the entire length of the blade body 22. Therefore, the number of campers can be increased over the entire length of the blade body 22.

This embodiment can be embodied with the following modifications.

-As shown in FIG. 6A, a step portion 41 may be formed at the rear end of the blade body 22. By accommodating the front end of the auxiliary member 23 in the step portion 41, the back surface 22a of the blade body 22 and the back surface 23a of the auxiliary member 23 may be flush.

When forming the step portion 41, as shown in FIG. 6B, an engaging protrusion 42 is formed on the side surface of the auxiliary member 23, and an engaging groove 43 corresponding to the blade body 22 is formed. You may. The engaging protrusion 42 may be engaged with the engaging groove 43, and the auxiliary member 23 may be fixed to the blade body 22 with a screw 44 or a port 24.

• As shown in FIG. 7, the rear end 52 of the blade body may be formed to be removable, and the rear end 52 and the auxiliary member 23 may be integrally molded. The integral molded part 54 is attached to the blade body with, for example, bolts. When replacing the auxiliary member 23 due to deformation or breakage due to long-term use, the auxiliary member can be replaced by replacing only the integrally molded part 54 without removing the entire blade 21 from the wind power generator 11. Since the 23 can be replaced, the auxiliary member 23 can be easily replaced. Since the auxiliary member 23 is integral with the rear end portion 52, the time required for replacing the auxiliary member 23 can be reduced.

• When the rear end portion 52 of the blade body is detachably formed, the rear end portion 52 and the auxiliary member 23 are formed separately without integral molding, and the auxiliary member 23 is bolted with bolts 24 or the like. It may be attached to the rear end 52. In this case, since the rear end portion 52 can be removed from the wind turbine generator 11 and the auxiliary member 23 can be replaced, the trapping member 23 can be easily replaced.

• A plurality of auxiliary members may be attached in the longitudinal direction of the blade body 22 as shown in, for example, an auxiliary member 55 shown in FIG. Since the radially outer end 2 2c of the blade body 22 attached to the windmill 20 has a larger turning radius than the radially inner end 2 2d of the blade body 22, the radially inner end 2 2c The moving speed is faster than 2d, and the relative wind speed Vr is faster. Therefore, the auxiliary member 55 at the radially outer end 22c bends before the auxiliary member 55 at the radially inner end 22d. In this case, corresponding to the difference in relative wind speed due to the difference in turning radius, the radial inner end 22 P leak 2/04211

1 3 Auxiliary member 55 Deformation of 5 can be delayed to improve power generation efficiency.

• The spacing between adjacent auxiliary members 55 in Fig. 8 is such that even if the radially outer auxiliary members 55 are deformed first, changes in air flow due to the deformation interfere with the radially inner auxiliary members 55. If an interval that does not occur is secured, it is preferable to make it as narrow as possible.

The auxiliary member 55 in FIG. 8 may be partially attached to the blade body 22 in the longitudinal direction. In this case, the auxiliary member 55 is preferably attached to at least the radially outer end 22 c of the blade body 22. The radially outer end 22c has the largest turning radius and the largest relative wind speed on the blade 21 and contributes most to the generation of lift. Therefore, the power generation efficiency can be effectively improved by attaching the auxiliary member 55 to at least the radially outer end 22c. The auxiliary member 55 may be attached to another part of the blade main body 22 without attaching the auxiliary member 55 to the radially outer end 22 c.

• The auxiliary member may be formed of a plurality of materials, each having a different coefficient of thermal expansion, and at least one of the plurality of materials may be formed to be conductive. For example, as shown in FIG. 8, a bimetal 56 may be attached to the auxiliary member 55 so as to be able to conduct electricity. An electric wire 57 that gives heat to the bimetal 56 is wired inside the blade body 22. In this case, the power generation efficiency can be adjusted by adjusting the extension direction of the auxiliary member 55 by thermally expanding the bimetal 56 by energization by the electric wire 57.

• The rear end of the catching member 23 may be bent to the windward side to make the camper of the entire blade 21 larger.

• The rear end of the auxiliary member 23 may be slightly bent to the leeward side within a range where the camper of the entire blade 21 is larger than that of the blade body 22 alone.

The front end of the auxiliary member 23 may not be formed in a slope, and there may be some steps at the connection between the back surface 2 2 a of the blade body 22 and the back surface 23 a of the auxiliary member 23. . Connections should be smooth so that airflow is smooth and unnecessary lift is prevented.

• The outer edge 22c of the blade body 22 in the radial direction may be formed to be narrower than the inner side in the radial direction, and the auxiliary member 23 may be formed so as to conform to the shape of the blade body 22. 02 04211

14

• The blade body 22 may be formed of metal, wood, or the like. In this case, it is desirable that the blade body 22 be made of fiber reinforced plastic which is lighter than metal and has the same strength as metal.

• The fiber of the fiber reinforced plastic forming the trapping member 23 and the blade body 22 is glass fiber / polyamide fiber, and the resin of the fiber reinforced plastic may be nylon or polyester. The auxiliary member 23 may be formed by processing rubber so that it is not deteriorated even by rain, or may be formed by a superelastic alloy ゃ morphous metal.

• The auxiliary member does not have to have flexibility. For example, a plate formed so as not to bend may be attached to the rear end of the blade 21 with an elastic member such as a spring. Even in this case, the lift increases due to the increase in the projected area and the camber, and the power generation efficiency is improved at a relatively low wind speed. At relatively high wind speeds, the elastic member radiuses and the entire plate extends in the direction of the relative wind speed, reducing the camber to about the same as the blade body 22. Therefore, it is possible to prevent the windmill from over-rotating while securing the desired power generation efficiency.

• The blade body 22 is not limited to a propeller blade, and may be, for example, a flat plate of a Dutch windmill. An auxiliary member may be attached to the rear end of the flat blade body.

'The auxiliary member 23 may be formed integrally with the blade body 22.

• The number of windmill blades is not limited to three. It will be apparent to one skilled in the art that the present invention may be embodied in other alternatives without departing from the spirit and scope of the invention.

Claims

The scope of the claims

1. The blade used for the wind turbine of the wind turbine is

A blade body (22) having a camber and rotatably mounted on a rotating shaft of a windmill;

An auxiliary member (23) provided at the rear end of the blade body in the rotation direction of the blade body so as to extend from the blade body.

The auxiliary member has a first shape that increases a camper of a blade and increases a projection area of the blade on a rotation surface of the windmill. The auxiliary member has a first shape when a wind power increases. From the shape described above, the camber of the entire blade is deformed to a second shape that reduces the camber to the same degree as the camper of the blade body, and when the wind power decreases, the wind returns to the first shape. Power generator blades.

2. The blade of the wind turbine generator according to claim 1,

The blade of the wind power generator, wherein the blade body has a shape determined according to a size of a windmill, a stall wind speed, and a power generation amount, and the auxiliary member is detachable from the blade body.

3. The blade of the wind turbine generator according to claim 1,

The blade of the wind power generator, wherein a rear end portion (52) of the blade main body is detachable from the blade main body.

4. In the blade of the wind turbine generator according to claim 3,

A blade of a wind power generator, wherein a rear end of the blade main body and the auxiliary member are molded.

5. The blade of the wind power generator according to any one of claims 1 to 4,

A back surface (23a) opposite to the front surface of the auxiliary member that receives the wind, and the blade The auxiliary member is attached to the rear end of the blade main body so that the back surface (22a) opposite to the front surface of the main body that receives the wind smoothly continues. .

6. The blade of the wind turbine generator according to claim 5,

The blade of the wind turbine generator, wherein the auxiliary member has a slope (23b) continuous with a back surface of the blade body.

7. In the blade of the wind turbine according to claim 5,

The rear end portion of the blade body has a step (41) for attaching the auxiliary member, and the auxiliary member has a stepped portion such that a back surface thereof is flush with a back surface of the blade body. A blade for a wind turbine generator, the blade being attached to a wind turbine generator.

8. The blade of the wind power generator according to any one of claims 1 to 7,

The blade of the wind power generator, wherein the auxiliary member is attached over the entire length of the blade main body.

9. The blade of the wind turbine generator according to any one of claims 1 to 7,

The length of the auxiliary member is shorter than the length of the blade main body, and the auxiliary member is provided at least at a radially outer end (22c) of the blade main body in a state where the blade main body is attached to a windmill. A blade of a wind turbine generator that is characterized by being installed.

10. The blade of the wind turbine generator according to any one of claims 1 to 7,

The blade of the wind turbine generator, wherein the auxiliary member (55) is one of a plurality of trapping members (55) attached in a longitudinal direction of the blade main body.

11. The blade of the wind power generator according to claim 10, wherein the adjacent auxiliary members are arranged at a predetermined interval.

12. The blade of the wind turbine generator according to claim 11, wherein the predetermined interval is such that a change in air flow due to deformation of the auxiliary member on the radially outer side of the blade is the auxiliary member on the radially inner side of the blade. A blade of a wind turbine generator having a distance that does not interfere with the wind turbine.

13. The wind power generator blade according to any one of claims 1 to 12,

The auxiliary member includes a plurality of materials, each having a different coefficient of thermal expansion, and at least one of the plurality of materials is electrically conductive.

14. The wind power generator blade according to any one of claims 1 to 13,

The blade of the wind turbine generator, wherein an extension amount of the auxiliary member extending rearward from the blade main body is 20% or less of a width of the blade main body.

1 5. The blades used in the wind turbine of the wind turbine

A catching member (23) extending from the blade body at the rear end of the blade body in the direction of rotation of the blade body;

The blade of the wind power generator, wherein the auxiliary member is detachable from the blade main body and is flexibly deformed in response to wind power.

16. The blade of the wind turbine generator according to claim 15, wherein an extension amount of the auxiliary member extending from the blade body is equal to or less than 20% of a width of the blade body. A blade of a wind turbine generator.

17. An auxiliary member which is used for a wind turbine of a wind power generator and is attached to a blade main body (2 2) having a camber and forms a blade (21) together with the blade main body,

In a state where the blade body is attached to the rear end of the blade body in the rotation direction of the blade body so as to extend from the blade body, the camber of the entire blade is increased, and the projected area of the blade on the rotating surface of the wind turbine The auxiliary member is configured to reduce the camber of the entire blade from the first shape to the same degree as the camper of the blade body when the wind power increases. An auxiliary member, wherein the auxiliary member returns to the first shape when the wind power decreases.

18. An auxiliary member that is attached to a blade body (2 2) used for a wind turbine of a wind power generator and forms a blade (2 1) together with the blade body, and the blade is arranged in the rotation direction of the blade body. A catching member, which is flexibly deformed in response to wind force when attached to a rear end of the main body so as to extend from the blade main body.

1 9. Wind power generator

A generator (6) having a rotor shaft (18);

A wind turbine (20) having a blade (21) attached to the rotor shaft and rotating the rotor shaft by wind pressure;

The blade is

A blade body (22) having a camber and rotatably attached to the rotor shaft;

The blade is attached to the rear end of the blade body in the rotation direction of the blade body. An auxiliary member (23) provided to extend from the blade main body, wherein the auxiliary member increases a camber of the blade and increases a projection area of the blade on a rotating surface of the windmill. The auxiliary member has a shape, and when the wind power increases, the auxiliary member deforms from the first shape to a second shape that reduces the camber of the entire blade to the same degree as the camber of the blade main body. Returns to the first shape when

A wind power generator, characterized in that:

20. The wind power generator

A generator (6) having a rotor shaft (18);

The blade is

A blade body (22) having a camber and rotatably attached to the rotor shaft;

The auxiliary member is detachable from the blade main body, and flexibly deforms according to wind force.

A wind power generator, characterized in that: