EP-4495422-B1 - RECEPTOR FOR BLADE OF WIND POWER GENERATION DEVICE

Inventors

• ISHIKAWA, KEITA
• MEGURO, Sae
• SUWA, AKIHIRO
• KAGETA, Soshi

Dates

Publication Date

20260506

Application Date

20230303

Claims (5)

1. A receptor (10) for a blade (7) of a wind power generation device (1), the wind power generation device (1) having the blades (7) that rotate by receiving wind and form a rotor (4), wherein the receptor (10) is fixed to a tip of each blade (7), and a hollow portion (21) is formed inside the receptor (10), the receptor (10) comprising: a receptor body (20) made of composite alloy; and the hollow portion (21) formed inside the receptor body (20), wherein the receptor body (20) is made of the composite alloy comprised of a Cu phase in which a heat-resistant element selected from Mo, W, Ta, Nb, V and Zr and a solid solution particle phase of Cr are uniformly dispersed, the composite alloy contains, in weight ratio relative to the composite alloy, 20 to 70% of Cu, and 1.5 to 64% of Cr, and the remainder is comprised of inevitable impurities, and the solid solution particles contained in the composite alloy have an average particle diameter of 20µm or less, and are uniformly dispersed in the Cu phase with a dispersion state index of 1.0 or less, and the receptor body (20) is fixed to a blade (7) side with a bolt (25), the receptor body (20) is provided with a cutout portion (29) formed as an entrance into the hollow portion (21), and the bolt (25) can be fastened to and unfastened from the blade (7) side from an inside of the hollow portion (21) .
2. The receptor (10) for the blade (7) of the wind power generation device (1) as claimed in claim 1, wherein the bolt (25) is made of the composite alloy.
3. The receptor (10) for the blade (7) of the wind power generation device (1) as claimed in claim 2, wherein a head portion (27) and a shaft portion body (28) of the bolt (25) are made of the composite alloy, and a thread (28b) of a shaft portion (28) of the bolt (25) is made of titanium alloy.
4. A side receptor conductive bolt (25) of a blade (7) of a wind power generation device (1), the side receptor conductive bolt (25) using composite alloy comprised of a Cu phase in which a heat-resistant element selected from Mo, W, Ta, Nb, V and Zr and a solid solution particle phase of Cr are uniformly dispersed, wherein the composite alloy contains, in weight ratio relative to the composite alloy, 20 to 70% of Cu, and 1.5 to 64% of Cr, and the remainder is comprised of inevitable impurities, and the solid solution particles contained in the composite alloy have an average particle diameter of 20µm or less, and are uniformly dispersed in the Cu phase with a dispersion state index of 1.0 or less.
5. The side receptor conductive bolt (25) of the blade (7) of the wind power generation device (1) as claimed in claim 4, wherein the composite alloy is used for a head portion (27) and a shaft portion body (28) of the side receptor conductive bolt (25), and titanium alloy is used for a thread (28b) of a shaft portion (28) of the side receptor conductive bolt (25) .

Description

TECHNICAL FIELD The present invention relates to a receptor for measures against lightning strike which is used at a blade of a wind power generation device (a wind power generator) . BACKGROUND ART According to increase in size of a wind power generation device in recent years, occurrences of damage by lightning strike to the wind power generation device have been reported, in particular, occurrences of damage by lightning strike to a blade, which passes through the highest point of the wind power generation device, have been reported more. For instance, there is a case where lightning strike is trapped while a lightning current is conducted from a receptor at a tip of the blade to a down conductor, and blade penetration damage occurs. In this case, if a contact resistance increases due to corrosion of a contact point of the down conductor, melting and erosion due to heat generation caused by the lightning current might occur inside the blade, and there is a risk that breakage of wire or a steam explosion may be induced. Therefore, in Patent Document 1, by using a tip unit in which a conductor from an inside of the blade tip to the down conductor is insulated, lightning damage is suppressed. Further, in Patent Document 2, by forming a lightning receiving protrusion at a lightning receptor at the blade tip, the function of trapping lightning is increased, thereby preventing lightning from being received at a boundary between the blade and the lightning receptor. Another background art lightning receptor is disclosed in US 2013/098651 A1. CITATION LIST PATENT DOCUMENT Patent Document 1: Japanese Patent No. 6467050Patent Document 2: Japanese Patent No. 5158730Patent Document 3: Japanese Patent No. 5880789Patent Document 4: WO2013/084634 A1 SUMMARY OF THE INVENTION When lightning strikes the wind power generation device, the lightning current generally flows from a lightning receiving component of the blade, i.e. the receptor, to the ground through the conductor along a route of a hub, a spindle and a tower. At this time, since the receptor fixed to the blade tip is affected by a centrifugal force, it is desirable to reduce weight of the receptor. However, although the tip unit of Patent Document 1 can be replaced, since a conductive bushing (see Fig. 7 in Patent Document 1) is necessary to connect an outer periphery and an inner periphery, a component count increases, and this may not be suitable for reduction in weight. Further, as for Patent Document 2 as well, since the lightning receiving structure of Patent Document 2 is required to provide the lightning receiving protrusion, a component count increases, and the weight may not be reduced. The present invention was made to solve such conventional problems, and an object of the present invention is to reduce the weight of the receptor used for measures against lightning strike on the blade of the wind power generation device. (1) A receptor for a blade of a wind power generation device of the present invention, the wind power generation device having the blades that rotate by receiving wind and form a rotor, wherein the receptor is fixed to a tip of each blade, and a hollow portion is formed inside the receptor.(2) As one aspect of the present invention, the receptor for the blade of the wind power generation device comprises: a receptor body made of composite alloy; and the hollow portion formed inside the receptor body, wherein the receptor body is made of the composite alloy comprised of a Cu phase in which a heat-resistant element selected from Mo, W, Ta, Nb, V and Zr and a solid solution particle phase of Cr are uniformly dispersed, the composite alloy contains, in weight ratio relative to the composite alloy, 20 to 70% of Cu, and 1.5 to 64% of Cr, and the remainder is comprised of inevitable impurities, and the solid solution particles contained in the composite alloy have an average particle diameter of 20um or less, and are uniformly dispersed in the Cu phase with a dispersion state index of 1.0 or less.(3) As another aspect of the present invention, the receptor body is fixed to a blade side with a bolt, the receptor body is provided with a cutout portion formed as an entrance into the hollow portion, and the bolt can be fastened to and unfastened from the blade side from an inside of the hollow portion.(4) As a further aspect of the present invention, the bolt is made of the composite alloy.(5) As a still further aspect of the present invention, a head portion and a shaft portion body of the bolt are made of the composite alloy, and a thread of a shaft portion of the bolt is made of titanium alloy. According to the present invention described above, it is possible to reduce the weight of the receptor that suppresses damage by lightning strike to the blade of the wind power generation device. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a receptor according to an embodiment 1.Fig. 2(a) is a perspective view showing a long