JP2020172868A - Wind turbine blade and wind power generation device - Google Patents

Abstract

To suppress lightning strike damage of a blade body by mitigating an electric field which is concentrated in an end of an anchor, without impairing safety.SOLUTION: The present invention relates to a wind turbine blade comprising: a blade constituting a rotor which is rotated by receiving winds; a receptor of a lightning protector attached to a tip end of the blade; and a down conductor which is electrically connected with the receptor, installed inside of the blade and conducts a lightning current to a grounding electrode in the case of lightning in the receptor. In the wind mill blade, the receptor includes an anchor which is positioned inside of the blade and fixes the receptor to the tip end of the blade, and the anchor is constituted by applying rounding to its front edge side and rear edge side end portions.SELECTED DRAWING: Figure 5

Description

The present invention relates to a blade for a wind turbine and a wind power generation device, and more particularly to a blade for a wind turbine and a wind power generation device suitable for those in which a receptor is installed at or near the tip of the blade as a countermeasure against lightning strikes on the blade.

With the increase in size of wind power generation equipment in recent years, lightning damage to wind power generation equipment has frequently occurred. In particular, many lightning strikes on blades that pass the highest point have been reported, and countermeasures are required. As a technique related to lightning strike countermeasures for blades, for example, the techniques described in Patent Documents 1, 2 and 3 have been proposed.

Patent Document 1 describes a technique capable of effectively preventing lightning damage to a blade by installing a receptor at or near the tip of the blade and wiring a down conductor connected to the receptor inside the blade. It is disclosed.

Further, in Patent Document 2, by coating at least the surface side of the blade with a conductive material only around the boundary between the receptor and the surface of the blade body, the boundary between the receptor and the surface of the blade and the receptor anchor can be obtained. Techniques that can suppress lightning strikes are described.

Further, in Patent Document 3, by arranging a ceramic member between the lightning receiving portion and the blade, electric field concentration is likely to occur at the interface between the ceramic member and the lightning receiving portion, and lightning damage to the blade body is effective. The technology that can be prevented is disclosed.

Japanese Unexamined Patent Publication No. 2005-113735 Japanese Unexamined Patent Publication No. 2012-246812 Japanese Unexamined Patent Publication No. 2011-163132

However, in the technique described in Patent Document 1, although the receptor is expected to effectively capture the lightning strike, the electric field is concentrated at the end of the receptor anchor, which causes the contact to a portion other than the receptor. I was inviting thunder.

Further, according to the technique described in Patent Document 2, the effect of relaxing the electric field concentrated on the end of the anchor is expected, but even so, lightning strikes on the blade body are occurring one after another.

Further, in the technique described in Patent Document 3, the ceramic member may be damaged by a lightning strike and the ceramic member may fall off.

The present invention has been made in view of the above points, and an object of the present invention is to reduce the electric field concentrated on the end of the receptor anchor without impairing the safety, and to suppress the lightning damage of the blade. To provide blades and wind power generators.

In order to achieve the above object, the blade for a wind turbine of the present invention includes a blade constituting a rotor that rotates in response to wind, a receptor for a lightning protection device attached to the tip of the blade, and the receptor and electrical. A blade for a wind turbine provided with a down conductor that is connected to the blade and is installed inside the blade to guide a lightning current when a lightning strikes the receptor to a ground electrode. The receptor is inside the blade. It is characterized in that it has an anchor for fixing the receptor to the tip of the blade, and the anchor is configured by rounding the front edge side end portion and the trailing edge side end portion thereof. ..

Further, in order to achieve the above object, the wind power generator of the present invention has a tower, a nacelle installed at the top of the tower so as to be rotationally driven in a horizontal plane, and a blade for a wind turbine connected to the nacelle. A wind turbine power generation device including a rotor composed of a hub and a hub, wherein the wind turbine blade is the wind turbine blade according to any one of claims 1 to 13.

According to the present invention, the electric field concentrated on the end of the anchor can be relaxed without impairing the safety, and the lightning damage of the blade can be suppressed.

It is an overall block diagram which shows the outline of Example 1 of the wind power generation apparatus of this invention. It is an overall block diagram which shows the outline of Example 1 of the blade for a wind turbine of this invention. It is sectional drawing along the longitudinal direction of the blade tip part which looked at the negative pressure surface side from the pressure surface side of the wind turbine blade of a comparative example. It is a figure which shows the electric field analysis result of the relationship between the periphery of a receptor and the relative electric field strength in the wind turbine blade of a comparative example. It is a figure which shows the electric field analysis result of the relationship between the circumference of a receptor anchor and the relative electric field strength in the wind turbine blade of a comparative example. It is sectional drawing of Example 1 of the blade for a wind turbine of this invention along the longitudinal direction of the blade tip part which looked at the negative pressure surface side from the pressure surface side. It is a figure which shows the electric field analysis result of the relationship between the periphery of a receptor and the relative electric field strength in Example 1 of the wind turbine blade of this invention. It is a figure which shows the electric field analysis result of the relationship between the circumference of a receptor anchor and the relative electric field strength in Example 1 of the blade for a wind turbine of this invention. It is a figure which shows the structure of a part of the blade tip part of Example 2 of the blade for a wind turbine of this invention. It is a figure which shows the structure of a part of the blade tip part of Example 3 of the blade for a wind turbine of this invention. It is a figure which shows the structure of a part of the blade tip part of Example 4 of the blade for a wind turbine of this invention.

Hereinafter, the blade for a wind turbine and the wind power generation device of the present invention will be described based on the illustrated examples. In each embodiment, the same reference numerals are used for the same components, and the description of overlapping parts will be omitted.

FIG. 1 shows an overall schematic configuration of a first embodiment of the wind power generator of the present invention.

As shown in FIG. 1, the wind power generator 50 of the present embodiment has a foundation 5 installed on the ground or offshore, a tower 4 installed on the foundation 5, and a top of the tower 4 in a horizontal plane. A nacelle 3 attached so as to be rotationally driven, a hub 2 attached to a main shaft (not shown) inside the nacelle 3, and a plurality of (three in this embodiment) blades 1a attached to the hub 2. It is roughly composed of a rotatable rotor composed of 1b and 1c.

In the wind power generator 50 configured in this way, a generator (not shown) is usually connected to the spindle via a speed increaser (not shown), and the rotational force (rotation) of the rotor is generated. Is configured to be transmitted to the generator via the speed increaser. Further, the rotor is rotated by receiving the wind on the blades 1a, 1b, and 1c, and the generator is rotated by the rotational force of the rotor to generate electric power. The blades 1a, 1b, and 1c are provided with a fiber reinforced plastic (FRP) outer skin (hereinafter, may be referred to as an outer surface) and a main girder (not shown) arranged inside the outer skin. It is configured.

Although not shown, a wind direction and wind speed sensor for measuring the wind direction and speed is installed on the nacelle 3, and the rotation speed sensor for detecting the rotation speed and the active power output by the generator are stored in the generator. A power sensor for measuring is also installed.

Further, the wind power generation device 50 includes a pitch angle adjusting device (not shown) that adjusts the angle (pitch angle) of the blades 1a, 1b, 1c with respect to the wind for each of the blades 1a, 1b, and 1c. The pitch angle adjusting device is configured to adjust the wind force (air volume) received by the blades 1a, 1b, 1c by changing the pitch angle of the blades 1a, 1b, 1c, and change the rotational energy of the rotor with respect to the wind. There is.

This makes it possible to control the rotation speed and the generated power in a wide wind speed range.

Further, the orientation of the nacelle 3 is referred to as a yaw angle, and the wind power generator 50 includes a yaw angle adjusting device (not shown) that controls the orientation of the nacelle 3, that is, the orientation of the rotating surface of the rotor.

FIG. 2 shows an overall schematic configuration of one blade 1a constituting the blades 1a, 1b, and 1c shown in FIG.

As shown in FIG. 2, a receptor 6 is installed at the tip of the blade 1a as a lightning protection device. The receptor 6 is electrically connected to the foundation 5 which is the ground electrode by the down conductor 7.

An intermediate receptor (not shown) may be provided depending on the size of the blade 1a. In this case, the intermediate receptor is also electrically connected to the foundation 5 which is the ground electrode by the down conductor 7.

When lightning strikes the receptor 6, the lightning current is guided to the foundation 5 which is the ground electrode via the down conductor 7. As shown in FIG. 1, the nacelle 3 and the tower 4 exist in the energization path from the down conductor 7 to the foundation 5 which is the ground electrode, but the lightning current may energize the nacelle 3 and the tower 4. The lightning protection wire (not shown) installed in the nacelle 3 and the lightning protection wire (not shown) installed in the tower 4 may be energized.

One end of the lightning protection wire installed in the nacelle 3 is electrically connected to the down conductor 7, and the other end of the lightning protection wire installed in the nacelle 3 is electrically connected to the lightning protection wire installed in the tower 4. It is connected to the. Further, one end of the lightning protection wire installed in the tower 4 is electrically connected to the lightning protection wire in the nacelle 3, and the other end of the lightning protection wire installed in the tower 4 is electrically connected to the foundation 5 serving as a grounding electrode. Is connected.

If the nacelle 3 and the tower 4 have sufficient processing capacity as a conductor of lightning current, the lightning protection wire installed in the nacelle 3 and / or the lightning protection wire installed in the tower 4 Installation may be omitted.

Next, the difference between the configuration of the wind turbine blade of the first embodiment of the present invention and the configuration of the wind turbine blade of the comparative example will be described.

First, a wind turbine blade of a comparative example will be described with reference to FIGS. 3 (a) and 4 (b).

FIG. 3 shows a cross section of the wind turbine blade of the comparative example along the longitudinal direction of the tip portion of the blade 1a when viewed from the pressure surface side to the negative pressure surface side.

As shown in FIG. 3, the receptor 6 attached to the tip of the blade 1a in the blade for the wind turbine of the comparative example has an adhesive and the receptor anchor 9 formed in a wedge shape narrowing toward the tip of the blade 1a of the comparative example. 11 is fixed to the tip of the blade 1a.

In addition, the receptor 6 and the receptor anchor 9 of the comparative example may be collectively referred to as a receptor. Hereinafter, the receptor 6 for receiving lightning and the receptor anchor 9 of the comparative example for holding the receptor 6 will be described separately.

Further, the down conductor 7 is fixed to the receptor anchor 9 of the comparative example by the fastening portion 10, and the adhesive 11 is filled in the gap between the receptor anchor 9 of the comparative example and the blade 1a.

By adopting the structure of the wind turbine blade of the comparative example as described above, it is possible to prevent the receptor 6 from falling off from the blade 1a due to the centrifugal force generated by the rotation of the blade 1a. Further, the wind turbine blade of the comparative example has a structure capable of withstanding centrifugal force by forming the shape of the receptor anchor 9 into a wedge shape narrowing toward the tip of the blade 1a in addition to the adhesive force of the adhesive 11. ing.

However, the front edge side end portion 9a and the rear edge side end portion 9b of the receptor anchor 9 of the comparative example are formed in a wedge shape narrowing toward the tip of the blade 1a, so that the angle formed by the bottom surface and the side surface of the receptor anchor 9 is formed. Since the angle is acute and the radius of curvature is small, the electric field strength around the front edge side end portion 9a and the rear edge side end portion 9b of the receptor anchor 9 becomes high when a thundercloud approaches.

4 (a) and 4 (b) are the results of electric field analysis by the finite element method simulating the situation where a thunderstorm approaches in the blade for a wind turbine of a comparative example. The horizontal axis of FIG. 4A is the relative position from the front edge side to the rear edge side around the receptacle 6, and the vertical axis is based on the apex of the receptacle 6 of the wind turbine blade of the comparative example, that is, the comparative example. This is the relative electric field strength, where 1 is the electric field strength at the apex of the receptor 6 of the wind turbine blade.

FIG. 4A shows the relative electric field strength around the receptor 6 in the wind turbine blade of the comparative example.

As can be seen from FIG. 4A, the wind turbine blade of the comparative example has the maximum relative electric field strength at the trailing edge side end portion 6b of the receptor 6, and the rear edge side end portion 6b to the front edge side end portion 6a of the receptor 6 The electric field strength tends to decrease toward the end.

FIG. 4B shows the relative electric field strength around the receptor anchor 9 in the wind turbine blade of the comparative example.

As can be seen from FIG. 4B, the receptor anchor 9 in the wind turbine blade of the comparative example has a high electric field strength at both the front edge side end portion 9a and the trailing edge side end portion 9b of the receptor anchor 9, and the relative electric field strength thereof is high. It can be seen that the values are about 1.2 and about 1.5, respectively, which are higher than the apex of the receptor 6.

From this, when a thunderstorm approaches, the insulation around the front edge side end 9a and / or the rear edge side end 9b of the receptor anchor 9 in the wind turbine blade of the comparative example is destroyed, and the leader (lightning pioneer discharge) is released. It can occur. Further, when the leader grows inside the blade 1a, it induces a lightning strike on the blade body formed of the FRP forming most of the blade 1a, not on the receptor 6.

As described above, the shape of the receptor anchor 9 in the wind turbine blade of the comparative example may damage the blade 1a.

Next, the blade for a wind turbine according to the first embodiment of the present invention will be described with reference to FIGS. 5 (a) and 6 (b).

FIG. 5 shows a cross section of the wind turbine blade Example 1 of the present invention along the longitudinal direction of the tip of the blade 1a when viewed from the pressure surface side to the negative pressure surface side.

As shown in FIG. 5, the receptor anchor 12 in the wind turbine blade of the present embodiment is rounded and has a large radius of curvature on the front edge side end portion 12a and the rear edge side as compared with the receptor anchor 9 in the wind turbine blade of the comparative example. It has an end 12b.

That is, the receptor anchor 12 in the wind turbine blade of the present embodiment is formed in a wedge shape narrowing toward the tip of the blade 1a, and is formed on the front edge side end portion 12a and the trailing edge side end portion 12b of the receptacle anchor 12 as a mold. It is constructed by being rounded by molding or cutting.

Moreover, the receptor anchor 12 in the blade for the wind turbine of this embodiment has an insulating member 13 that is in close contact with the surface of the receptor anchor 12 around the receptor anchor 12, and the insulating member 13 is the front edge side end portion 12a and the rear of the receptor anchor 12. It covers the entire receptor anchor 12 including the veranda end 12b.

Further, in the insulating member 13 of the present embodiment, the wall thickness of the portion covering the front edge side end portion 12a of the receptor anchor 12 and the wall thickness (L2) of the portion covering the trailing edge side end portion 12b of the receptor anchor 12 are insulated. It is formed thicker than the wall thickness (L2) of other parts of the member 13.

The effects of the wind turbine blades having the configuration of this embodiment will be described with reference to FIGS. 6 (a) and 6 (b).

6 (a) and 6 (b) are the results of electric field analysis by the finite element method simulating the situation where a thunderstorm approaches in the blade for a wind turbine of this embodiment. The horizontal axis of FIG. 6A is the relative position from the front edge side to the trailing edge side around the receptacle 6, and the vertical axis is based on the apex of the receptacle 6 of the wind turbine blade of the comparative example, that is, the comparative example. This is the relative electric field strength, where 1 is the electric field strength at the apex of the receptor 6 of the wind turbine blade.

FIG. 6A shows the relative electric field strength around the receptor 6 in the wind turbine blade of this embodiment.

As can be seen from FIG. 6A, the wind turbine blade of the present embodiment has a maximum relative electric field strength at the trailing edge side end portion 6b of the receptor 6, and the wind turbine blade of the receptacle 6 has a maximum relative electric field strength, similarly to the wind turbine blade of the comparative example. The electric field strength tends to decrease from the trailing edge side end portion 6b to the front edge side end portion 6a.

FIG. 6B shows the relative electric field strength around the receptor anchor 12 in the wind turbine blade of this embodiment.

As can be seen from FIG. 6B, the wind turbine blades of the present embodiment have lower electric field strengths at the front edge side end portion 12a and the rear edge side end portion 12b of the receptor anchor 12 than the wind turbine blades of the comparative example. , The relative electric field strength is about 0.5 in both cases.

Like the wind turbine blade of the present embodiment described above, the front edge side end portion 12a and the rear edge side end portion 12b of the receptor anchor 12 are rounded to increase the radius of curvature thereof, thereby front of the receptor anchor 12. It is understood that the electric field strength around the veranda end 12a and the trailing edge 12b is relaxed.

Further, as in the receptor anchor 12 of this embodiment, at least the front edge side end portion 12a and the trailing edge side end portion 12b are covered with the insulating member 13, so that the dielectric breakdown strength can be increased. Further, since the insulating member 13 is installed inside the blade 1a, even if the insulating member 13 is damaged, the safety is not immediately impaired.

The receptor 6 and the receptor anchor 12 may be configured as separate parts, or the receptor 6 and the receptor anchor 12 may be integrally molded by molding, cutting, or using a 3D printer or the like. Depending on the manufacturer's equipment, it may be cheaper to integrate them, and vice versa.

Further, in the wind turbine blade of this embodiment, the receptor anchor 12 and the down conductor 7 are electrically and mechanically connected at the fastening portion 10. As a method of fastening the fastening portion 10, for example, a crimp terminal or a compression terminal is used, but the present invention is not limited to this. When fastening with a crimp terminal, the fastening portion 10 can be inexpensive. When fastening with a compression terminal, the entire terminal is compressed and connected, so that the mechanical load acting on the wire of the down conductor 7 can be reduced.

As a result, the possibility that the wire of the down conductor 7 is cut can be reduced, and the reliability of the blade 1a from the viewpoint of lightning protection can be improved.

Further, in the wind turbine blade of this embodiment, the gap between the blade 1a and the receptor anchor 12 is filled with the adhesive 11. It is desirable that the adhesive 11 is filled so as to completely cover the entire surface of the receptor anchor 12 and the insulating member 13.

By doing so, even if the insulating member 13 is dielectrically broken down, the growth of the leader can be suppressed by the insulating property of the adhesive 11.

It is desirable that the adhesive 11 described above is filled so that there are no minute gaps (air gaps). If there is an air gap in the adhesive 11, when the surrounding electric field strength increases, a partial discharge occurs in the air gap, which deteriorates the insulating property of the adhesive 11 and causes the adhesive 11 to break down. There is a possibility of reaching. As the material of the adhesive 11, for example, a resin such as epoxy is selected, but this is not the case.

Further, the receptor anchor 12 may be provided with a bolt seat 8 (see FIG. 8), and the receptor anchor 12 may be fastened with a bolt from the outer surface of the blade 1a via the bolt seat 8.

By using the fixing with the adhesive 11 and the fixing with the bolts in combination, it is possible to more reliably prevent the receptor 6 from falling off from the blade 1a.

As the material of the insulating member 13, for example, a resin such as epoxy is selected, but this is not the case. Further, it is desirable that the insulating member 13 is molded by vacuum pressure impregnation. By molding by vacuum pressure impregnation, the possibility that the insulating member 13 contains an air gap can be reduced, and the insulation reliability of the blade 1a can be improved.

Further, it is desirable that the insulating member 13 is formed in close contact with the receptor anchor 12. If an air gap is included between the receptor anchor 12 and the insulating member 13, partial discharge may occur in this air gap. By forming the insulating member 13 in close contact with the receptor anchor 12, the possibility of including such an air gap can be reduced and the insulation reliability of the blade 1a can be improved.

According to the present embodiment described above, since the electric field concentrated on the end of the receptor anchor 12 can be relaxed without impairing the safety, a wind turbine blade capable of suppressing lightning strike damage of the blade 1a and the wind turbine blade can be used. A wind power generator equipped can be obtained.

FIG. 7 shows a partial configuration of a blade tip portion of the second embodiment of the blade for a wind turbine of the present invention. Although a part of the configuration is omitted in FIG. 7, the configuration is substantially the same as that of the blade tip portion of the first embodiment of FIG. 5, and the differences from the blade tip portion of the first embodiment will be described below. To do.

In the present embodiment shown in FIG. 7, the insulating member is composed of a first insulating member 14 and a second insulating member 15, and the first insulating member 14 has a front edge side end portion 12a of the receptor anchor 12 as a second insulating member. The insulating member 15 covers the trailing edge side end portion 12b of the receptor anchor 12, and the joint surface 20 between the first insulating member 12a and the second insulating member 12b is the pressure surface side and the negative pressure surface side of the receptor anchor 12. It is located in the middle.

More preferably, the joint surface 20 faces on a perpendicular bisector of the front edge side end portion 12a and the rear edge side end portion 12b of the receptor anchor 12.

Further, the joint surface 20 of the first insulating member 14 and the second insulating member 15 often contains an air gap due to non-uniformity of the adhesive or the like, and the insulating property is often deteriorated. On the other hand, the receptacle anchor Compared to the front edge side and the rear edge side of 12, the pressure surface side and the negative pressure surface side of the receptacle anchor 12 have a large curvature and have a shape closer to a flat surface. That is, the electric field strength around the pressure surface side and the negative pressure surface side of the receptor anchor 12 is smaller than that around the front edge side and the rear edge side of the receptor anchor 12.

Therefore, if the first insulating member 14 and the second insulating member 15 are joined on the middle side of the pressure surface side and the negative pressure surface side of the receptor anchor 12, the joint surface 20 is not exposed to a relatively high electric field strength. Since there is no such material, the insulating property of the joint surface 20 can be maintained.

Further, by forming the insulating member covering the receptor anchor 12 with the first insulating member 14 and the second insulating member 15, the mounting on the receptor anchor 12 becomes easy.

Although the example in which the insulating member is divided into two is shown in this embodiment, the third and fourth insulating members may be applied.

Even with such a configuration of this embodiment, the same effect as that of the first embodiment can be obtained.

FIG. 8 shows a partial configuration of a blade tip portion of the third embodiment of the blade for a wind turbine of the present invention. Although a part of the configuration is omitted in FIG. 8, the configuration is substantially the same as that of the blade tip portion of the first embodiment of FIG. 5, and the differences from the blade tip portion of the first embodiment will be described below. To do.

In the present embodiment shown in FIG. 8, the insulating member 13 covers the entire surface including the fastening portion 10 of the receptor anchor 12 with the down conductor 7, and also covers a part of the down conductor 7 on the receptacle anchor 12 side. ..

Further, the receptor anchor 12 is provided with a bolt seat 8, and the receptor anchor 12 is fastened with a bolt from the outer surface of the blade 1a via the bolt seat 8.

With such a configuration, it is possible to suppress the generation of a reader from the down conductor 7.

Further, the front edge side end portion 13a and the trailing edge side end portion 13b of the insulating member 13 have a radius of curvature smaller than that of the front edge side end portion 12a and the trailing edge side end portion 12b of the receptor anchor 12, respectively.

With such a configuration, the insulating member 13 has a shape closer to a wedge shape as compared with the receptor anchor 12, and has a structure capable of withstanding centrifugal force. In other words, the wedge shape of the insulating member 13 can compensate for the force that can withstand the centrifugal force lost by rounding the end portion of the receptor anchor 12.

Even with such a configuration of this embodiment, the same effect as that of the first embodiment can be obtained.

FIG. 9 shows a partial configuration of the blade tip portion of the fourth embodiment of the blade for a wind turbine of the present invention. Although a part of the configuration is omitted in FIG. 0, the configuration is substantially the same as that of the blade tip portion of the first embodiment of FIG. 5, and the differences from the blade tip portion of the first embodiment will be described below. To do.

As shown in FIG. 9, the receptor anchor 12 of this embodiment is narrowed from the front edge side end portion 12a and the trailing edge side end portion 12b toward the root of the blade 1a, and from the front edge side end portion 12a and the trailing edge side end portion 12b. It has a shape that narrows even toward the tip of the blade 1a. Further, the insulating member 13 is configured to cover the entire receptor anchor 12.

With such a configuration, the electric field strength around the front edge side end portion 12a and the trailing edge side end portion 12b of the receptor anchor 12 can be further reduced, so that the wall thickness of the insulating member 13 can be designed to be thin.

Even with such a configuration of this embodiment, the same effect as that of the first embodiment can be obtained.

The present invention is not limited to the above-mentioned examples, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to those having all the described configurations. It is possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment.

1a, 1b, 1c ... Blade, 2 ... Hub, 3 ... Nacelle, 4 ... Tower, 5 ... Foundation, 6 ... Receptor, 6a ... Front porch of the receptor, 6b ... Rear porch of the receptor, 7 ... Down conductor , 8 ... Bolt seat, 9 ... Receptor anchor of Comparative Example, 9a ... Front edge side end of Receptor anchor of Comparative Example, 9b ... Rear edge side end of Receptor anchor of Comparative Example, 10 ... Fastening part, 11 ... Adhesive, 12 ... Receptor anchor of the present invention, 12a ... Front edge side end of the receptor anchor of the present invention, 12b ... Rear edge side end of the receptor anchor of the present invention, 13 ... Insulating member, 13a ... Front edge side end of the insulating member, 13b ... trailing edge side end of the insulating member, 14 ... first insulating member, 15 ... second insulating member, 20 ... joint surface, 50 ... wind power generator.

Claims (14)

A blade that constitutes a rotor that rotates in response to wind, a receptor for a lightning protection device attached to the tip of the blade, and a receptor that is electrically connected to the receptor and is installed inside the blade and is installed inside the blade. It is a blade for a wind turbine equipped with a down conductor that guides the lightning current when a lightning strikes to the ground electrode.
The receptor is located inside the blade and has an anchor that secures the receptor to the tip of the blade.
The anchor is a blade for a wind turbine, characterized in that the front edge side end portion and the trailing edge side end portion are rounded. The blade for a wind turbine according to claim 1.
The anchor is a blade for a wind turbine, which is formed in a wedge shape narrowing toward the tip of the blade. The blade for a wind turbine according to claim 2.
The anchor has an insulating member that is in close contact with the surface of the anchor around the anchor, and the insulating member covers at least the front edge side end portion and the trailing edge side end portion of the anchor for a wind turbine. blade. The blade for a wind turbine according to claim 3.
The insulating member is a blade for a wind turbine, which covers the entire anchor. The blade for a wind turbine according to claim 4.
The wall thickness of the portion of the insulating member that covers the front edge side end of the anchor and the wall thickness of the portion of the insulating member that covers the trailing edge side of the anchor are the same as the wall thickness of the other portion of the insulating member. A blade for wind turbines that is characterized by being thicker than the other. The blade for a wind turbine according to claim 4.
A blade for a wind turbine, characterized in that a space between the blade and the insulating member is filled with an adhesive, and the adhesive is filled so as to cover the entire surface of the insulating member and the anchor. The blade for a wind turbine according to claim 6.
A blade for a wind turbine, wherein a bolt seat is provided on the anchor, and the anchor is fastened with a bolt from the outer surface of the blade via the bolt seat. The blade for a wind turbine according to claim 4.
The insulating member is composed of a first insulating member and a second insulating member, the first insulating member has a front edge side end portion of the anchor, and the second insulating member has a trailing edge side end portion of the anchor. A blade for a wind turbine, each of which is covered and the joint surface between the first insulating member and the second insulating member is provided on the middle side of the pressure surface side and the negative pressure surface side of the anchor. The blade for a wind turbine according to claim 8.
A blade for a wind turbine, wherein the joint surface is located on a perpendicular bisector of a front edge side end portion and a rear edge side end portion of the anchor. The blade for a wind turbine according to claim 4.
A blade for a wind turbine, wherein the insulating member further covers a part of the down conductor on the anchor side. The blade for a wind turbine according to claim 4.
The anchor has a shape that narrows from the front edge side end portion and the trailing edge side end portion of the anchor toward the root of the blade, and narrows from the front edge side end portion and the rear edge side end portion of the anchor toward the tip end portion of the blade. A blade for a windmill that is characterized by being there. The blade for a wind turbine according to any one of claims 3 to 11.
The insulating member is a blade for a wind turbine, which is formed by vacuum pressurization impregnation. The blade for a wind turbine according to any one of claims 3 to 12.
A blade for a wind turbine, wherein the insulating member is an epoxy resin. A wind turbine equipped with a tower, a nacelle installed at the top of the tower so that it can be rotationally driven in a horizontal plane, and a rotor connected to the nacelle and composed of a wind turbine blade and a hub.
The wind turbine blade is the wind turbine blade according to any one of claims 1 to 13.

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