JP2004011616A - Wind mill blade structure for wind power generator - Google Patents

Wind mill blade structure for wind power generator Download PDF

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Publication number
JP2004011616A
JP2004011616A JP2002170380A JP2002170380A JP2004011616A JP 2004011616 A JP2004011616 A JP 2004011616A JP 2002170380 A JP2002170380 A JP 2002170380A JP 2002170380 A JP2002170380 A JP 2002170380A JP 2004011616 A JP2004011616 A JP 2004011616A
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Prior art keywords
blade
wind turbine
members
turbine blade
wind
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Japanese (ja)
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Yukio Satonaka
里中　幸雄
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Shinmaywa Industries Ltd
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Shin Meiva Industry Ltd
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Priority to JP2002170380A priority Critical patent/JP2004011616A/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Abstract

<P>PROBLEM TO BE SOLVED: To secure enough strength when a wind mill blade 3 for a large-sized wind power generator is made into a structure wherein the blade is partitioned in the longitudinal direction without using a column unlike the conventional technique. <P>SOLUTION: The wind mill blade 3 is partitioned into three blade members 6-8 in the longitudinal direction and the blade members 6-8 are connected by cylindrical connecting members 9, 10 arranged in the wind mill blade 3 in each divided part 3b, 3c, respectively. In the first divided part 3b on a base end side, a lot of bolts 11a which penetrate peripheral walls of the blade members 6, 7 and the connecting member 9 from the outer circumferential side are arranged over almost the entire circumference and a nut 11b is screwed and fastened on the end side of each bolt 11a inside the connecting member 9. In the second divided part 3c on a tip side, a lot of bolts 13a are arranged so as to penetrate the wind mill blade 3 itself in a thickness direction and a nut 13b is screwed and fastened on the end side of each bolt 13a. Joint parts 14 are provided on the connecting members 9, 10, respectively. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、風力発電機の風車ブレードに関し、特に、大型の中空状ブレードを長手方向に複数の部材に分割したものの構造の技術分野に属する。
【０００２】
【従来の技術】
従来より、この種の風車ブレードとして、例えば特開２０００−６４９４１号公報に開示されるように、風車の回転軸から放射状に延びるように複数の支柱を立設し、この各支柱に対してその基端側から順番に複数の分割ブレードを重ねていって、最後に支柱の先端側においてナットにより固定するようにしたものが知られている。このものでは、長さが２０ｍ以上にもなる長尺の風車ブレードを複数の部材に分けて製造し、それを現場まで運搬して組み立てるようにしたことで、我が国の交通規制下でも運搬に支障を来すことがない。
【０００３】
【発明が解決しようとする課題】
ところで、近年、ＣＯ２を排出しないクリーンエネルギとして、風力発電が再び脚光を浴びており、我が国における風力発電機の能力も増大の一途を辿っている。すなわち、前記従来例のものでは、風力発電機の発電能力は概略４００〜５００キロワットくらいであり、風車の直径も４０〜５０ｍ程度に過ぎないが、現在、計画中の発電設備ではその発電能力が１メガワットを超えるものが多く、そのなかには５メガワットに迫るものもある。
【０００４】
そのように能力の高い発電設備では、風車の直径が１００ｍを超えるものとなり、１つの風車ブレードの長さは５０ｍくらいになる。そして、このように大きな風車ブレードの場合は、ブレード部材のみで所要の構造強度を確保することが好ましく、前記従来例のように支柱を用いることは単に部品点数の増加や重量の増大を招くのみとなる。
【０００５】
本発明は、斯かる点に鑑みてなされたものであり、その目的とするところは、大型の風力発電機に用いられる風車ブレードの構造に工夫を凝らし、該風車ブレードを長手方向に分割可能な構造とする場合に、従来までのように支柱を用いることなく、ブレード部材のみによって十分な強度を確保することにある。
【０００６】
【課題を解決するための手段】
前記目的を達成するために、本発明の第１の解決手段では、風車ブレードの分割部位において隣接するブレード部材同士に跨るように筒状の接続部材を内挿し、この接続部材とブレード部材とを風車ブレードの略全周に亘って締結部材により結合する構成とした。
【０００７】
すなわち、本願請求項１の発明は、風力発電機の風車の回転軸に対してそれぞれ径方向に延びるように取り付けられる複数枚の風車ブレードの構造を対象とする。そして、前記各風車ブレードをそれぞれ風車の径方向に長い中空状のものとし、且つその長手方向に２つ以上のブレード部材に分割して、その分割部位において隣接するブレード部材同士に跨るように筒状の接続部材を内挿するとともに、該接続部材とブレード部材とを風車ブレードの略全周に亘って複数の締結部材により結合してなる構成とする。
【０００８】
前記の構成により、中空状の風車ブレードをその長手方向に２つ以上のブレード部材に分割可能としたことで、長さが５０ｍくらいにもなる長尺状のブレードを２５ｍ以下の部材に分割することができ、これにより発電設備の建設現場への運搬が可能になる。また、隣接するブレード部材同士に跨るように筒状の接続部材を設けるとともに、この接続部材とブレード部材とを略全周に亘って多数の締結部材により結合したことで、風車の回転時に作用する遠心力や揚力等に対して十分な引っ張り、曲げ及び捻り強度が得られるので、従来例（特開２０００−６４９４１号公報）のような支柱を用いる必要がなく、部品点数を減らして運搬や現場での組立て作業を容易化できるとともに、風車の重量を低減することも可能となる。
【０００９】
前記のような風車ブレードにおいて、接続部材は、風車ブレードの長手方向の寸法を少なくともその厚み方向の寸法よりも大きくするのが好ましい。こうすれば、ブレード部材と接続部材との重なり合う部分が、風車ブレードの長手方向について十分に大きくなるので、風車ブレードの重量の増大を招くことなく、特に曲げや捻りに対して十分な強度が得られる。
【００１０】
また、風車ブレードをその長手方向の中央位置よりも基端側で分割する場合には、締結部材として、ブレード部材又は接続部材の何れか一側からそれらを貫通するボルトと、該ブレード部材又は接続部材の他側に配設されて前記ボルトの先端側に螺合するナットとを用いることが好ましい（請求項２の発明）。
【００１１】
すなわち、一般的に風車ブレードは先端側が扁平な翼断面形状となる一方、基端側に向かって徐々に断面が円形状に近づくものなので、この発明において対象とする大型の風車ブレードの場合、その長手方向中央位置よりも基端側の分割箇所では、組立の際に作業者が容易に内部空間に入ることができる。従って、ブレード部材及び接続部材をボルト、ナットにより締結する構造とすれば、現場での作業が容易且つ確実なものとなる。また、ボルトの長さは必要最小限度のものとすればよく、こうすることで重量の低減が図られる。
【００１２】
一方、風車ブレードを長手方向の中央位置よりも先端側で分割する場合には、締結部材として、風車ブレードをその厚み方向一側から他側まで貫通するボルトと、これに螺合するナットとを用いる（請求項３の発明）。こうすれば、断面が扁平な形状で内部に作業者が入れないブレードの先端側部分でも、ブレード部材と接続部材とを容易に結合することができる。
【００１３】
さらに、前記接続部材には、風車ブレードの内部空間を長手方向に区画するように節部を設けることが好ましい（請求項５の発明）。こうすれば、長尺状の風車ブレードが竹のように節を有する構造となり、軽量でありながら特に捻りに強いものとなる。
【００１４】
次に、本発明の第２の解決手段では、風車ブレードの分割部位において隣接するブレード部材の端部にそれぞれ内方へ突出するブレード長手方向に長い形状のフランジ部を設け、このフランジ部同士を重ね合わせてそれらをブレード長手方向に貫通する締結部材により、略全周に亘って結合する構成とした。
【００１５】
すなわち、本願請求項５の発明は、前記請求項１の発明と同じ風車ブレードの構造を対象とし、各風車ブレードをそれぞれ風車の径方向に長い中空状のものとし且つその長手方向に２つ以上のブレード部材に分割する。そして、その分割部位において隣接するブレード部材の端部にそれぞれ周壁部から内方に向かって突出する環状のフランジ部を形成し、このフランジ部の厚みをその突出量よりも大きく設定するとともに、互いに接合させた環状部同士を各々風車ブレードの長手方向に貫通する複数の締結部材によって該風車ブレードの略全周に亘って結合してなる構成とする。
【００１６】
この構成により、請求項１の発明と同様に長尺状の風車ブレードを複数の部材に分割して現場へ運搬することができる。また、各ブレード部材の端部に設けたフランジ部同士を略全周に亘って複数の締結部材により締結固定することで、ブレード部材同士を確実に結合することができる。しかも、前記フランジ部をブレード長手方向に長いものとし、且つブレード長手方向に貫通する締結部材により固定したことで、ブレード長手方向への引っ張り強度は勿論、曲げや捻り強度も高くなり、これにより、前記請求項１の発明と同様に支柱を無くすことができるから、部品点数の削減と重量の低減とが図られる。
【００１７】
また、本発明の第３の解決手段では、風車ブレードの分割部位において隣接するブレード部材の一方の端部にブレード長手方向に長い筒状の挿入部を形成し、これを他方のブレード部材の端部に内挿して、それらを締結部材により略全周に亘って結合する構成とした。
【００１８】
すなわち、本願請求項６の発明は、前記請求項１や請求項５の発明と同じ風車ブレードの構造を対象とし、各風車ブレードをそれぞれ風車の径方向に長い中空状のものとし且つその長手方向に２つ以上のブレード部材に分割する。そして、その分割部位において隣接するブレード部材の一方の端部に、他方のブレード部材の端部に内挿される筒状の挿入部を形成し、この挿入部のブレード長手方向の寸法をブレード厚み方向の寸法よりも大きく設定するとともに、その挿入部と隣接するブレード部材の端部とを風車ブレードの略全周に亘って複数の締結部材により結合してなる構成とする。
【００１９】
この構成により、請求項１や請求項５の発明と同様に長尺状の風車ブレードを複数の部材に分割して現場へ運搬することができる。また、ブレード部材の一方の端部に設けた筒状の挿入部を隣接するブレード部材の端部に内挿して、略全周に亘って複数の締結部材により固定することで、ブレード部材同士を確実に結合することができる。しかも、前記挿入部をブレード長手方向に長いものとしたことで、特に曲げや捻り強度を高くすることができ、さらに、締結部材を風車ブレードの長手方向に２列以上、配設すれば、ブレード長手方向への引っ張り強度も高くすることができる。よって、前記請求項１や請求項５の発明と同様の作用効果が得られる。
【００２０】
【発明の実施の形態】
以下、本発明の実施形態を図面に基いて説明する。
【００２１】
（実施形態１）
図１は、本願発明に係る風力発電機の風車Ｗの外観を示す。この風車Ｗは、地面から例えば７０ｍ以上の高さに延びる鉄塔１の最上部に配設されており、図示しない発電機に連結された回転軸２に対しその径方向に延びるように複数枚（図例では３枚）の風車ブレード３，３，３をそれぞれ取り付けたものである。すなわち、前記鉄塔１の最上部には、発電機を収容する収容部４が配設されていて、この収容部４の前壁を貫通する回転軸２が図示しない軸受によって回転自在に支持されるとともに、この回転軸２の端部が発電機の入力軸に連結されて一体的に回転するようになっている。
【００２２】
前記風車ブレード３，３，…は、例えば繊維補強樹脂（ＦＲＰ）等により形成され、図２に示すようにそれぞれ５０ｍ近い長さを有する長尺状のものである。また、各風車ブレード３は中空状であり、基端部に風車Ｗの回転軸２に結合される円筒部３ａが形成されている以外は、概ね翼断面形状を有するものであって、先端側が扁平な翼断面形状であり、そこから基端側に向かって徐々にブレードの幅及び厚みが増して、円形に近いアーモンドのような断面形状となる。詳しくは図３（ａ）にも示すように、風車ブレード３の幅は、基端の円筒部３ａよりも少し先端側の部位で最大になっていて、そこから先端部に向かって徐々に減少しており、また、同図（ｂ）に示すように、風車ブレード３の厚みはその先端部から基端部に向かって略一様に増大している。
【００２３】
また、この発明の特徴部分として、前記風車ブレード３はその長手方向（以下、ブレード長手方向ともいう）について基端側から順番に第１〜第３の３つのブレード部材６，７，８に分割されていて、第１及び第２ブレード部材６，７がその間に跨るように内挿された第１接続部材９により連結され、同様に、第２及び第３ブレード部材７，８が第２接続部材１０により連結されている。詳しくは、基端側の第１分割部３ｂについて図４に示すように、第１ブレード部材６の先端側と第２ブレード部材７の基端側とにはそれぞれ周壁部の厚みを増した厚肉部６ａ，７ａが形成され、この厚肉部６ａ，７ａの内周側に筒状の第１接続部材９が内挿されている。この接続部材９の一側（図の右側）と第２ブレード部材７の厚肉部７ａとは、周方向に略全周に亘って並設された多数の締結部材１１，１１，…により結合されており、同様に、接続部材９の他側（図の左側）と第１ブレード部材６の厚肉部６ａとが周方向に略全周に亘って並設された多数の締結部材１１，１１，…により結合されている（図には断面に現れるもののみを示す）。
【００２４】
前記各締結部材１１は、ブレード部材６，７の外周側から該ブレード部材６，７の厚肉部６ａ，７ａを貫通し、さらに接続部材９の周壁を貫通して、先端側が該接続部材９の内方に突出するボルト１１ａと、接続部材９の内方に配設されて前記ボルト１１ａの先端側に螺合するナット１１ｂとからなる。すなわち、この実施形態のような大型の風車ブレード３の場合、基端側の分割部３ｂの断面形状は円形に近いアーモンド状になっており、組立の際に作業者が風車ブレード３の内部空間に入ることができるから、接続部材９の内方に位置するナット１１ｂをしっかりと固定することができ、締結作業が容易且つ確実に行える。このため、ボルト１１ａの長さは必要最小限のものとして、重量の低減を図ることができる。尚、各ボルト１１ａの基端部は、ブレード部材６，７の外周に形成された円形の凹部１２内に収容されている。
【００２５】
一方、図５に示す先端側の第２分割部３ｃでは、前記第１分割部３ｂと同様に連続する第２ブレード部材７及び第３ブレード部材８の厚肉部７ｂ，８ａの内周側に、筒状の第２接続部材１０が内挿されていて、この第２接続部材１０と厚肉部７ｂ，８ａとがそれぞれ締結部材１３，１３，…、即ちボルト１３ａ及びナット１３ｂにより結合されている。但し、先端側の第２分割部３ｃにおいてはブレード部材７，８がかなり扁平な形状となっており、ここでは風車ブレード３の内部空間に作業者が入ることは困難である。そこで、各ボルト１３ａをブレード部材７，８の厚み方向に一側（図の上側）から他側（図の下側）まで貫通させて、ナット１３ｂを螺合させるようにしており、このことで、内部に作業者が入れない風車ブレード３の先端側においても締結作業を容易に行うことができる。尚、各ボルト１３ａの基端部とナット１３ｂとは、それぞれ、ブレード部材７，８の外周に形成された円形の凹部１２，１２，…内に収容されている。
【００２６】
さらに、前記接続部材９、１０は、いずれも風車ブレード３の長手方向の寸法Ｌがその厚み方向の寸法Ｄよりも大きくされていて、その長手方向の略中央部には風車ブレード３の内部空間を長手方向に区画するように節部１４が設けられている。そのように風車ブレード３の長手方向に十分な長さを有する接続部材９，１０を用いることにより、風車ブレード３の分割部位３ｂ，３ｃにおいてブレード部材６，７，８と接続部材９，１０とが重なり合う部分の面積が大きくなり、このことで、補強のための重量の増大を抑制しながら大きな結合強度を得ることができる。また、長尺状の風車ブレード３が竹のように途中に節を有する構造となることで、軽量でありながら特に捻りに強いものとなる。
【００２７】
尚、前記図４及び図５にそれぞれ示すように、隣り合うブレード部材６，７，８の端面の一方には円環状の凸部が形成され、また、他方には前記凸部対応する形状の凹部が形成されており、それらが互いに嵌合されるようになっている。
【００２８】
したがって、この実施形態に係る風車ブレード３の構造によれば、まず、風力発電機用の大型の風車Ｗに用いられる中空状の風車ブレード３，３，…を、その長手方向に３つのブレード部材６〜８に分割可能としたことで、長さが５０ｍくらいになる長尺状のブレード３を２０ｍくらいの部材に分割することができ、このことで、風車ブレード３，３，…を発電設備の建設現場へ運搬することができる。
【００２９】
また、１つの風車ブレード３において隣接する第１及び第２ブレード部材６，７や第２及び第３ブレード部材７，８の間にそれぞれ接続部材９，１０を内挿し、該接続部材９，１０とブレード部材６〜８とが重なり合う部分の面積を十分に大きくするとともに、それらを略全周に亘って多数の締結部材１１，１１，…、１３，１３，…により結合しており、さらに、接続部材９，１０に節部１４を設けたことで、補強のための重量の増大を抑制しながら、風車Ｗの回転時に作用する遠心力や揚力等に対して十分な引っ張り、曲げ及び捻り強度を得ることができる。この結果、従来までのような支柱を用いる必要がなくなり、部品点数を減らして運搬や組立て作業を容易化できるとともに、風車Ｗの重量も低減できる。
【００３０】
さらに、この実施形態では、作業者が内部空間に入ることのできる風車ブレード３基端側の第１分割部３ｂにおいて、ブレード部材６，７の周壁の厚肉部６ａ，７ａと接続部材９の周壁とをボルト１１ａにより貫通してこれにナット１１ｂを螺合締結し、一方、扁平形状で作業者が入れない先端側の第２分割部３ｃにおいては、長めのボルト１３ａ，１３ａ，…によりブレード部材６，７自体を厚み方向に貫通して、これにナット１３ｂを螺合締結するようにしているので、現場での作業を極めて容易で且つ確実なものとすることができる。
【００３１】
尚、前記風車ブレード３，３，…の接続部材９，１０としては、図６に一例を示すように節部１４のないものを用いてもよい。また、締結部材としてボルト及びナットを用いる必要はなく、同図に示すようにリベット１５，１５，…を用いることも可能である。
【００３２】
また、風車ブレード３は、３つのブレード部材６〜８に分割する必要はなく、例えば２つのブレード部材に分割するようにしてもよいし、或いは４つ以上のブレード部材に分割するようにしてもよい。この点は以下の実施形態２、３においても同様である。
【００３３】
（実施形態２）
図７は、本発明の実施形態２に係る風車ブレード３の分割部の構造を示す。尚、この風車ブレード３の全体的な構造は上述した実施形態１のものと同じであり、同一部材には同一の符号を付してその説明は省略する。そして、この実施形態２のものでは、前記実施形態１のような接続部材９，１０は用いず、互いに隣接するブレード部材６〜８の長手方向の端部に、その周壁部から内方に向かって突出する環状のフランジ部１６，１６，…を設けて、これを風車ブレード３の長手方向に貫通するボルト１７ａ及びナット１７ｂ（締結部材）により結合したものである。
【００３４】
すなわち、前記図７に風車ブレード３の第１分割部３ｂについて示すように、第１ブレード部材６の先端側と第２ブレード部材７の基端側とには、それぞれ内方に向かって突出する環状のフランジ部１６，１６が形成されている。これらのフランジ部１６は、その厚み、即ちブレード長手方向の寸法が周壁からの突出量に比べて大きく設定されている。そして、それらの両フランジ部１６，１６同士を風車ブレード３の長手方向に貫通するようにボルト１７ａが配設され、このボルト１７ａの先端側にナット１７ｂが螺合締結されている。そのボルト１７ａ及びナット１７ｂは風車ブレード３の周方向に略等間隔を開けて略全周に亘って配設されている（図には断面に現れるもののみを示す）。
【００３５】
したがって、この実施形態２に係る風車ブレード３の構造によれば、前記実施形態１のものと同様に、長尺状の風車ブレード３を複数の部材６〜８に分割して現場へ運搬することができる。また、各ブレード部材６〜８の端部に設けたフランジ部１６，１６同士を略全周に亘って多数の締結部材１７，１７，…により固定したことで、ブレード部材６〜８同士を確実に結合することができる。
【００３６】
その際、前記フランジ部１６を比較的、ブレード長手方向に長い形状として、これをブレード長手方向に貫通する締結部材１７，１７，…により結合したことで、風車ブレード３の長手方向への引っ張り荷重に対しては勿論、曲げ荷重や捻り荷重に対しても十分に高い強度が得られ、これにより、前記実施形態１のものと同様に支柱が不要になって、部品点数の削減や重量の低減が図られる。
【００３７】
（実施形態３）
図８は、本発明の実施形態３に係る風車ブレード３の分割部の構造を示す。尚、この風車ブレード３の全体的な構造は上述した実施形態１、２のものと同じであり、同一部材には同一の符号を付してその説明は省略する。そして、この実施形態３のものでは、前記実施形態２のものと同様に接続部材９，１０は用いずに、ブレード部材６，７の長手方向の一方の端部に設けた筒状の挿入部を隣接する他方のブレード部材７，８の端部に内挿して、それらをリベット１５，１５，…（締結部材）により結合したものである。
【００３８】
すなわち、前記図８に風車ブレード３の第１分割部３ｂについて示すように、第１ブレード部材６の先端側と、隣り合う第２ブレード部材７の基端側とには、それぞれ厚肉部６ａ，７ａが形成され、さらに、第１ブレード部材６の先端面には、その内周寄りの部位から第２ブレード部材７に向かって延びるように、筒状の挿入部１８が形成されている。一方、第２ブレード部材７の厚肉部７ａの内周側には、前記第１ブレード部材６の挿入部１８が差し込まれるように肉盗み、即ち被挿入部１９が形成されている。
【００３９】
そして、前記第１ブレード部材６の挿入部１８が第２ブレード部材７の被挿入部１９に内挿され、さらに、それらを固定する多数のリベット１５，１５，…が風車ブレード３の略全周に亘って周方向に略等間隔を空けて配設されるとともに、このリベット１５，１５，…の列がブレード長手方向に２列、設けられている。尚、前記リベット１５，１５，…は、ブレード部材６，７の断面に現れるもののみを図示し、それ以外は図示省略する。また、締結部材としてリベット１５，１５，…の代わりにボルト、ナットを用いてもよいことは言うまでもない。
【００４０】
したがって、この実施形態３に係る風車ブレード３の構造によれば、前記実施形態１、２のものと同様に、長尺状の風車ブレード３を複数の部材６〜８に分割して現場へ運搬することができるとともに、該各ブレード部材６〜８同士を支柱を用いることなく、十分亜強度でもって結合することができ、これにより、部品点数の削減や重量の低減が図られる。
【００４１】
【発明の効果】
以上、説明したように、請求項１の発明に係る風力発電機の風車ブレード構造によると、風車ブレードをその長手方向に２以上のブレード部材に分割し、その分割部位において隣接するブレード部材同士に跨るように筒状の接続部材を内挿して、この接続部材とブレード部材とを風車ブレードの略全周に亘って締結部材により結合する構成としたことで、該ブレード部材を取り付けるための支柱が無くとも、風車の回転時に作用する遠心力や揚力等に対して十分な引っ張り、曲げ及び捻り強度を得ることができる。よって、部品点数を減らして運搬や現場での組立て作業を容易化できるとともに、風車の重量を低減できる。
【００４２】
請求項２の発明によると、大型の風車ブレードをその中央よりも基端側で分割する場合には、現場での組み立ての際に作業者が内部空間に入ることができるから、ブレード部材及び接続部材をボルト、ナットによって容易且つ確実に結合することができる。従って、ボルトの長さを必要最小限度のものとすることで、重量の低減が図られる。
【００４３】
請求項３の発明によると、風車ブレードの先端側の分割部位では、ボルトにより風車ブレード全体をその厚み方向に貫通し、その先端側にナットを螺合させるようにすることで、締結作業を容易に行うことができる。
【００４４】
請求項４の発明によると、接続部材に節部を設けることで、長尺状の風車ブレードを竹のような構造として、軽量でありながら特に捻りに強いものとすることができる。
【００４５】
また、請求項５の発明に係る風力発電機の風車ブレード構造によると、風車ブレードをその長手方向に２以上のブレード部材に分割し、その分割部位において隣接するブレード部材の端部にそれぞれブレード長手方向に長いフランジ部を形成して、それらをブレード長手方向に貫通する締結部材により略全周に亘って結合する構成としたことで、前記請求項１の発明と同様の効果が得られる。
【００４６】
さらに、請求項６の発明に係る風力発電機の風車ブレード構造によると、風車ブレードをその長手方向に２以上のブレード部材に分割し、その分割部位において隣接するブレード部材の一方の端部にブレード長手方向に長い筒状の挿入部を形成し、これを他方のブレード部材の端部に内挿してそれらを締結部材により略全周に亘って結合する構成としたことで、前記請求項１や請求項５の発明と同様の効果が得られる。
【図面の簡単な説明】
【図１】本発明の実施形態に係る風力発電機の風車の外観を示す正面図（ａ）及び側面図（ｂ）である。
【図２】実施形態１の風車ブレードの構造を示す斜視図である。
【図３】実施形態１の風車ブレードの構造を示す上面図（ａ）及び正面図（ｂ）である。
【図４】風車ブレードの基端側の分割部の構成を示す拡大断面図である。
【図５】風車ブレードの先端側の分割部に係る図４相当図である。
【図６】締結部材としてリベットを用いた変形例に係る図４相当図である。
【図７】実施形態２に係る図４相当図である。
【図８】実施形態３に係る図４相当図である。
【符号の説明】
Ｗ　　　　　　風車
２　　　　　　　回転軸
３　　　　　　　風車ブレード
６，７，８　　ブレード部材
９、１０　　　接続部材
１１ａ，１３ａ，１７ａ　　　ボルト（締結部材）
１１ｂ，１３ｂ，１７ｂ　　　ナット（締結部材）
１４　　　　　接続部材の節部
１５　　　　　リベット（締結部材）
１６　　　　　フランジ部
１８　　　　　挿入部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wind turbine blade of a wind power generator, and particularly to a technical field of a structure in which a large hollow blade is divided into a plurality of members in a longitudinal direction.
[0002]
[Prior art]
Conventionally, as this type of windmill blade, for example, as disclosed in Japanese Patent Application Laid-Open No. 2000-64941, a plurality of columns are erected so as to extend radially from the rotation axis of the windmill. There is known a configuration in which a plurality of divided blades are sequentially stacked from a base end side, and finally fixed at a distal end side of a support column with a nut. In this product, a long windmill blade with a length of 20 m or more is manufactured by dividing it into multiple members, and transporting it to the site to assemble it, which hinders transportation even under Japanese traffic regulations. Never come.
[0003]
[Problems to be solved by the invention]
By the way, in recent years, wind power has come into the spotlight again as clean energy that does not emit CO2, and the capacity of wind power generators in Japan has been steadily increasing. That is, in the conventional example, the power generation capacity of the wind power generator is approximately 400 to 500 kilowatts, and the diameter of the wind turbine is only about 40 to 50 m. Many are over one megawatt, some approaching five megawatts.
[0004]
In such a high-capacity power generation facility, the diameter of a windmill exceeds 100 m, and the length of one windmill blade is about 50 m. In the case of such a large wind turbine blade, it is preferable to secure the required structural strength only with the blade member, and the use of the pillar as in the conventional example merely causes an increase in the number of parts and an increase in weight. It becomes.
[0005]
The present invention has been made in view of such a point, and an object thereof is to devise a structure of a wind turbine blade used for a large-sized wind power generator and divide the wind turbine blade in a longitudinal direction. In the case of a structure, the object is to secure sufficient strength only by the blade member without using a pillar as in the related art.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to a first solution of the present invention, a tubular connecting member is inserted so as to straddle adjacent blade members at a divided portion of a wind turbine blade, and the connecting member and the blade member are separated. The wind turbine blades are configured to be connected by a fastening member over substantially the entire circumference.
[0007]
That is, the invention of claim 1 of the present application is directed to a structure of a plurality of wind turbine blades attached so as to extend in a radial direction with respect to a rotation axis of a wind turbine of a wind power generator. Each of the wind turbine blades is formed in a hollow shape that is long in the radial direction of the wind turbine, and is divided into two or more blade members in the longitudinal direction. A connection member having a shape of a circle is inserted therein, and the connection member and the blade member are connected by a plurality of fastening members over substantially the entire circumference of the windmill blade.
[0008]
With the above configuration, the hollow wind turbine blade can be divided into two or more blade members in the longitudinal direction, so that a long blade having a length of about 50 m can be divided into members having a length of 25 m or less. This allows transportation of the power generation equipment to the construction site. In addition, a cylindrical connecting member is provided so as to straddle adjacent blade members, and the connecting member and the blade member are joined by a number of fastening members over substantially the entire circumference, thereby acting when the windmill rotates. Since sufficient pulling, bending and torsional strength against centrifugal force and lift force can be obtained, there is no need to use a column as in the conventional example (Japanese Patent Application Laid-Open No. 2000-64941), and the number of parts is reduced, and , And the weight of the windmill can be reduced.
[0009]
In the windmill blade as described above, it is preferable that the connecting member has a dimension in the longitudinal direction of the windmill blade larger than at least a dimension in the thickness direction. With this configuration, the overlapping portion between the blade member and the connection member becomes sufficiently large in the longitudinal direction of the wind turbine blade, so that sufficient strength against bending and twisting can be obtained without increasing the weight of the wind turbine blade. Can be
[0010]
In the case where the wind turbine blade is divided on the base end side from the center position in the longitudinal direction, as a fastening member, a bolt penetrating therethrough from any one of the blade member and the connection member, and the blade member or the connection member It is preferable to use a nut arranged on the other side of the member and screwed to the tip end side of the bolt (the invention of claim 2).
[0011]
That is, in general, the wind turbine blade has a flat blade cross section on the tip side, while the cross section gradually approaches a circular shape toward the base end side. An operator can easily enter the internal space at the division at the base end side of the longitudinal center position during assembly. Therefore, if the blade member and the connection member are configured to be fastened with bolts and nuts, work on site can be performed easily and reliably. In addition, the length of the bolt may be set to the minimum necessary length, so that the weight can be reduced.
[0012]
On the other hand, when the wind turbine blade is divided at the distal end side from the center position in the longitudinal direction, as a fastening member, a bolt that penetrates the wind turbine blade from one side in the thickness direction to the other side, and a nut that is screwed to the bolt. (Invention of claim 3). In this case, the blade member and the connection member can be easily connected to each other even at the tip end portion of the blade, which has a flat cross section and does not allow an operator to enter the inside.
[0013]
Further, it is preferable that the connection member is provided with a node portion so as to partition the internal space of the wind turbine blade in the longitudinal direction (the invention of claim 5). In this case, the long windmill blade has a structure having a knot like a bamboo, and is particularly lightweight but resistant to twisting.
[0014]
Next, in a second solution of the present invention, at the divided portion of the wind turbine blade, an end portion of the adjacent blade member is provided with a flange portion having a long shape in the longitudinal direction of the blade protruding inward. A configuration is adopted in which the members are superimposed and joined over substantially the entire circumference by a fastening member that penetrates them in the blade longitudinal direction.
[0015]
That is, the invention of claim 5 of the present application is directed to the same structure of the wind turbine blade as the invention of claim 1, wherein each of the wind turbine blades has a hollow shape that is long in the radial direction of the wind turbine and two or more wind turbine blades are formed in the longitudinal direction. Divided into blade members. Then, annular flanges projecting inward from the peripheral wall are formed at the ends of the adjacent blade members at the divided portions, and the thickness of the flanges is set to be larger than the amount of projection, and The joined annular portions are connected over substantially the entire circumference of the wind turbine blade by a plurality of fastening members penetrating in the longitudinal direction of the wind turbine blade.
[0016]
With this configuration, similarly to the first aspect of the present invention, the long windmill blade can be divided into a plurality of members and transported to the site. In addition, the flange members provided at the ends of the blade members are fastened and fixed by a plurality of fastening members over substantially the entire circumference, so that the blade members can be securely connected to each other. Moreover, the flange portion is elongated in the blade longitudinal direction, and is fixed by a fastening member penetrating in the blade longitudinal direction, so that not only the tensile strength in the blade longitudinal direction but also the bending and torsional strength are increased, whereby Since the support can be eliminated as in the first aspect of the present invention, the number of parts and the weight can be reduced.
[0017]
According to a third solution of the present invention, a cylindrical insertion portion that is long in the blade longitudinal direction is formed at one end of an adjacent blade member at a divided portion of a wind turbine blade, and this is inserted into the end of the other blade member. In this case, they are inserted into the parts, and they are connected over substantially the entire circumference by fastening members.
[0018]
That is, the invention of claim 6 of the present application is directed to the same structure of the wind turbine blade as that of the invention of claim 1 or 5, wherein each wind turbine blade has a hollow shape which is long in the radial direction of the wind turbine and its longitudinal direction. Into two or more blade members. Then, at one end of the adjacent blade member at the divided portion, a cylindrical insertion portion to be inserted into the end of the other blade member is formed, and the dimension of the insertion portion in the blade longitudinal direction is set in the blade thickness direction. Is set to be larger than the dimension of the wind turbine blade, and the insertion portion and the end of the adjacent blade member are connected by a plurality of fastening members over substantially the entire circumference of the wind turbine blade.
[0019]
With this configuration, similarly to the first and fifth aspects of the present invention, the long windmill blade can be divided into a plurality of members and transported to the site. Also, by inserting a cylindrical insertion portion provided at one end of the blade member into an end of an adjacent blade member and fixing the plurality of fastening members over substantially the entire circumference, the blade members are connected to each other. It can be securely connected. Moreover, since the insertion portion is elongated in the longitudinal direction of the blade, the bending and torsional strength can be particularly increased. Further, if the fastening members are arranged in two or more rows in the longitudinal direction of the windmill blade, the blade becomes The tensile strength in the longitudinal direction can also be increased. Therefore, the same functions and effects as those of the first and fifth aspects are obtained.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0021]
(Embodiment 1)
FIG. 1 shows the appearance of a wind turbine W of a wind power generator according to the present invention. The wind turbine W is disposed at the uppermost part of a steel tower 1 extending to a height of, for example, 70 m or more from the ground, and a plurality of wind turbines W extend in a radial direction with respect to a rotating shaft 2 connected to a generator (not shown). In this example, three wind turbine blades 3, 3, and 3 are attached. That is, at the uppermost part of the steel tower 1, a housing 4 for housing a generator is disposed, and the rotating shaft 2 penetrating the front wall of the housing 4 is rotatably supported by a bearing (not shown). At the same time, the end of the rotating shaft 2 is connected to the input shaft of the generator so as to rotate integrally.
[0022]
The wind turbine blades 3, 3,... Are formed of, for example, a fiber reinforced resin (FRP) or the like, and each have a length of about 50 m as shown in FIG. Each of the wind turbine blades 3 is hollow, and has a substantially wing cross-sectional shape except that a cylindrical portion 3a coupled to the rotating shaft 2 of the wind turbine W is formed at a base end thereof. The blade has a flat wing cross-sectional shape, and the width and thickness of the blade gradually increase from the wing toward the base end side, resulting in a cross-sectional shape similar to a circular almond. Specifically, as shown in FIG. 3 (a), the width of the wind turbine blade 3 is maximum at a position slightly distal to the cylindrical portion 3a at the base end, and gradually decreases from there toward the distal end. As shown in FIG. 3B, the thickness of the wind turbine blade 3 increases substantially uniformly from the distal end to the proximal end.
[0023]
Further, as a characteristic portion of the present invention, the wind turbine blade 3 is divided into first to third three blade members 6, 7, 8 in the longitudinal direction (hereinafter also referred to as blade longitudinal direction) in order from the base end side. And the first and second blade members 6, 7 are connected by a first connection member 9 inserted so as to straddle between them, and similarly, the second and third blade members 7, 8 are connected by a second connection member. They are connected by a member 10. More specifically, as shown in FIG. 4, the thickness of the peripheral wall portion is increased on the distal end side of the first blade member 6 and on the proximal end side of the second blade member 7, as shown in FIG. The thick portions 6a and 7a are formed, and a cylindrical first connection member 9 is inserted into the inner peripheral side of the thick portions 6a and 7a. One side (the right side in the figure) of the connecting member 9 and the thick portion 7a of the second blade member 7 are joined by a number of fastening members 11, 11,... Similarly, the other side (left side in the figure) of the connection member 9 and the thick portion 6a of the first blade member 6 are arranged in parallel with each other over substantially the entire circumference in the circumferential direction. (Only those appearing in the cross section are shown in the figure).
[0024]
Each of the fastening members 11 penetrates through the thick portions 6a, 7a of the blade members 6, 7 from the outer peripheral side of the blade members 6, 7, and further penetrates the peripheral wall of the connecting member 9, and the distal end side is connected to the connecting member 9 And a nut 11b disposed inside the connecting member 9 and screwed to the tip side of the bolt 11a. That is, in the case of a large windmill blade 3 as in this embodiment, the sectional shape of the base-side divided portion 3b is an almond-like shape close to a circle. Therefore, the nut 11b located inside the connection member 9 can be firmly fixed, and the fastening operation can be performed easily and reliably. For this reason, the length of the bolt 11a can be reduced to a necessary minimum, and the weight can be reduced. The base end of each bolt 11a is housed in a circular recess 12 formed on the outer periphery of the blade members 6, 7.
[0025]
On the other hand, in the second divided portion 3c on the distal end side shown in FIG. 5, on the inner peripheral side of the thick portions 7b and 8a of the second blade member 7 and the third blade member 8 which are continuous similarly to the first divided portion 3b. , A cylindrical second connecting member 10 is inserted therein, and the second connecting member 10 and the thick portions 7b, 8a are connected by fastening members 13, 13,..., Ie, bolts 13a and nuts 13b. I have. However, the blade members 7 and 8 have a considerably flat shape in the second division 3c on the distal end side, and it is difficult for an operator to enter the internal space of the wind turbine blade 3 here. Therefore, each bolt 13a is penetrated from one side (upper side in the figure) to the other side (lower side in the figure) in the thickness direction of the blade members 7 and 8, and the nut 13b is screwed. Also, the fastening operation can be easily performed even on the tip end side of the windmill blade 3 where no worker can enter. Note that the base end of each bolt 13a and the nut 13b are housed in circular recesses 12, 12,... Formed on the outer periphery of the blade members 7, 8, respectively.
[0026]
Further, in each of the connection members 9 and 10, the length L in the longitudinal direction of the wind turbine blade 3 is larger than the dimension D in the thickness direction thereof, and the internal space of the wind turbine blade 3 is provided substantially at the center in the longitudinal direction. Are provided in such a manner as to partition the longitudinal direction. By using the connecting members 9 and 10 having a sufficient length in the longitudinal direction of the wind turbine blade 3 in such a manner, the blade members 6, 7, and 8 and the connecting members 9 and 10 are separated at the divided portions 3b and 3c of the wind turbine blade 3. The area of the overlapped portion becomes large, which makes it possible to obtain a large bonding strength while suppressing an increase in weight for reinforcement. In addition, since the long windmill blade 3 has a structure having a knot in the middle like bamboo, the windmill blade 3 is particularly lightweight but resistant to twisting.
[0027]
As shown in FIGS. 4 and 5, an annular convex portion is formed on one of the end surfaces of the adjacent blade members 6, 7, and 8, and the other has a shape corresponding to the convex portion. Recesses are formed so that they fit together.
[0028]
Therefore, according to the structure of the wind turbine blade 3 according to this embodiment, first, the hollow wind turbine blades 3, 3, ... used for the large wind turbine W for the wind power generator are divided into three blade members in the longitudinal direction. By being able to be divided into 6 to 8, the long blade 3 having a length of about 50 m can be divided into members having a length of about 20 m. To the construction site.
[0029]
In addition, connecting members 9 and 10 are inserted between the first and second blade members 6 and 7 and the second and third blade members 7 and 8 adjacent to each other in one wind turbine blade 3, and the connecting members 9 and 10 are inserted. And the blade members 6 to 8 have a sufficiently large area where they overlap with each other, and are joined by a number of fastening members 11, 11, ..., 13, 13, ... over substantially the entire circumference. By providing the joints 14 on the connecting members 9 and 10, sufficient tensile, bending and torsional strength against centrifugal force and lift acting upon rotation of the windmill W while suppressing an increase in weight for reinforcement. Can be obtained. As a result, it is not necessary to use a column as in the related art, so that the number of components can be reduced, transportation and assembly work can be facilitated, and the weight of the windmill W can be reduced.
[0030]
Furthermore, in this embodiment, the thick portions 6a and 7a of the peripheral walls of the blade members 6 and 7 and the connecting member 9 are formed in the first divided portion 3b on the base end side of the wind turbine blade 3 where the operator can enter the internal space. The nut 11b is screwed and fastened to the peripheral wall with a bolt 11a, and the second divided portion 3c on the distal end side, which is flat and does not allow an operator to enter, is bladed with longer bolts 13a, 13a,. Since the nuts 13b are threadedly fastened to the members 6 and 7 themselves in the thickness direction, work on site can be made extremely easy and reliable.
[0031]
Incidentally, as the connecting members 9, 10 of the wind turbine blades 3, 3,..., Those having no nodes 14 may be used as shown in an example in FIG. It is not necessary to use bolts and nuts as fastening members, and rivets 15, 15,... Can be used as shown in FIG.
[0032]
Further, the wind turbine blade 3 does not need to be divided into three blade members 6 to 8, and may be divided into, for example, two blade members, or may be divided into four or more blade members. Good. This point is the same in the following second and third embodiments.
[0033]
(Embodiment 2)
FIG. 7 shows a structure of a divided portion of the wind turbine blade 3 according to the second embodiment of the present invention. The overall structure of the wind turbine blade 3 is the same as that of the above-described first embodiment, and the same members are denoted by the same reference numerals and description thereof will be omitted. In the second embodiment, the connecting members 9 and 10 as in the first embodiment are not used, and the blade members 6 to 8 which are adjacent to each other are provided with the ends in the longitudinal direction inward from the peripheral wall portions. Are provided, and are connected by bolts 17a and nuts 17b (fastening members) penetrating in the longitudinal direction of the wind turbine blade 3.
[0034]
That is, as shown in FIG. 7 for the first divided portion 3b of the wind turbine blade 3, the distal end side of the first blade member 6 and the proximal end side of the second blade member 7 protrude inward, respectively. Annular flange portions 16 are formed. The thickness of these flange portions 16, that is, the dimension in the blade longitudinal direction, is set to be larger than the amount of protrusion from the peripheral wall. A bolt 17a is provided so as to penetrate both flange portions 16, 16 in the longitudinal direction of the wind turbine blade 3, and a nut 17b is screwed and fastened to a tip end of the bolt 17a. The bolts 17a and the nuts 17b are arranged at substantially equal intervals in the circumferential direction of the wind turbine blade 3 and over substantially the entire circumference (only those appearing in the cross section are shown in the figure).
[0035]
Therefore, according to the structure of the windmill blade 3 according to the second embodiment, similarly to the first embodiment, the long windmill blade 3 is divided into a plurality of members 6 to 8 and transported to the site. Can be. In addition, the flange members 16, 16 provided at the ends of the blade members 6 to 8 are fixed to each other over a substantially entire circumference by a large number of fastening members 17, 17,. Can be combined.
[0036]
At this time, the flange portion 16 has a relatively long shape in the longitudinal direction of the blade, and is connected by fastening members 17, 17,... Penetrating in the longitudinal direction of the blade. Of course, a sufficiently high strength against bending load and torsion load can be obtained, thereby eliminating the necessity of a support as in the first embodiment, reducing the number of parts and weight. Is achieved.
[0037]
(Embodiment 3)
FIG. 8 shows a structure of a divided portion of the wind turbine blade 3 according to the third embodiment of the present invention. Note that the overall structure of the wind turbine blade 3 is the same as that of the first and second embodiments, and the same members are denoted by the same reference numerals and description thereof will be omitted. In the third embodiment, a cylindrical insertion portion provided at one end in the longitudinal direction of the blade members 6, 7 without using the connection members 9, 10 as in the second embodiment. Are inserted into the ends of the other adjacent blade members 7, 8 and they are connected by rivets 15, 15,... (Fastening members).
[0038]
That is, as shown for the first divided portion 3b of the wind turbine blade 3 in FIG. 8, a thick portion 6a is provided on the distal end side of the first blade member 6 and on the proximal end side of the adjacent second blade member 7, respectively. , 7a are formed, and a cylindrical insertion portion 18 is formed on the distal end surface of the first blade member 6 so as to extend toward a second blade member 7 from a portion near the inner periphery thereof. On the other hand, on the inner peripheral side of the thick portion 7a of the second blade member 7, a steal, that is, an inserted portion 19 is formed so that the insertion portion 18 of the first blade member 6 is inserted.
[0039]
The insertion portion 18 of the first blade member 6 is inserted into the insertion portion 19 of the second blade member 7, and a number of rivets 15, 15,. Are arranged at substantially equal intervals in the circumferential direction, and two rows of the rivets 15, 15,... Are provided in the longitudinal direction of the blade. The rivets 15, 15,... Only show those appearing in the cross section of the blade members 6, 7, and the other rivets are not shown. Needless to say, bolts and nuts may be used instead of the rivets 15, 15,... As the fastening members.
[0040]
Therefore, according to the structure of the wind turbine blade 3 according to the third embodiment, similarly to the first and second embodiments, the long wind turbine blade 3 is divided into a plurality of members 6 to 8 and transported to the site. In addition, the blade members 6 to 8 can be connected to each other with sufficient sub-strength without using columns, thereby reducing the number of parts and weight.
[0041]
【The invention's effect】
As described above, according to the wind turbine blade structure of the wind power generator according to the first aspect of the present invention, the wind turbine blade is divided into two or more blade members in the longitudinal direction, and adjacent blade members are divided at the divided portion. By inserting a cylindrical connecting member so as to straddle and connecting the connecting member and the blade member with a fastening member over substantially the entire circumference of the windmill blade, a support for attaching the blade member is provided. Even without this, it is possible to obtain sufficient tensile, bending and torsional strength against centrifugal force, lift, and the like that act when the windmill rotates. Therefore, the number of parts can be reduced to facilitate transportation and assembly work on site, and the weight of the windmill can be reduced.
[0042]
According to the invention of claim 2, when the large wind turbine blade is divided at the base end side from the center thereof, an operator can enter the internal space at the time of assembling at the site, so that the blade member and the connection The members can be easily and reliably connected by bolts and nuts. Therefore, the weight can be reduced by minimizing the length of the bolt.
[0043]
According to the third aspect of the present invention, at the divided portion on the front end side of the wind turbine blade, the entirety of the wind turbine blade is penetrated in the thickness direction by a bolt, and a nut is screwed onto the front end side, thereby facilitating the fastening operation. Can be done.
[0044]
According to the fourth aspect of the present invention, by providing the connecting member with the node, the long windmill blade can be made to have a structure like bamboo, and can be made lightweight and particularly resistant to twisting.
[0045]
Further, according to the wind turbine blade structure of the wind power generator according to the invention of claim 5, the wind turbine blade is divided into two or more blade members in the longitudinal direction, and each of the divided portions is provided at the end of the adjacent blade member. The same effect as the first aspect of the present invention can be obtained by forming a flange portion that is long in the direction and connecting them over substantially the entire circumference by a fastening member penetrating in the blade longitudinal direction.
[0046]
Furthermore, according to the wind turbine blade structure of the wind power generator according to the invention of claim 6, the wind turbine blade is divided into two or more blade members in the longitudinal direction, and a blade is provided at one end of an adjacent blade member at the divided portion. By forming a cylindrical insertion portion that is long in the longitudinal direction, inserting the insertion portion into the end of the other blade member, and connecting them over substantially the entire circumference by a fastening member, The same effect as that of the fifth aspect is obtained.
[Brief description of the drawings]
FIG. 1 is a front view (a) and a side view (b) showing the appearance of a wind turbine of a wind power generator according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a structure of a wind turbine blade according to the first embodiment.
3A and 3B are a top view and a front view, respectively, showing the structure of the wind turbine blade according to the first embodiment.
FIG. 4 is an enlarged cross-sectional view showing a configuration of a divided portion on a proximal end side of a wind turbine blade.
FIG. 5 is a diagram corresponding to FIG. 4 relating to a split portion on the tip end side of a wind turbine blade.
FIG. 6 is a diagram corresponding to FIG. 4 according to a modification using rivets as fastening members.
FIG. 7 is a diagram corresponding to FIG. 4 according to the second embodiment.
FIG. 8 is a diagram corresponding to FIG. 4 according to the third embodiment.
[Explanation of symbols]
W Windmill 2 Rotary shaft 3 Windmill blades 6, 7, 8 Blade members 9, 10 Connection members 11a, 13a, 17a Bolts (fastening members)
11b, 13b, 17b Nut (fastening member)
14 Knot of connection member 15 Rivet (fastening member)
16 Flange part 18 Insertion part

Claims (6)

風力発電機の風車の回転軸に対してそれぞれ径方向に延びるように取り付けられる複数枚の風車ブレードの構造であって、
前記各風車ブレードは、それぞれ、風車の径方向に長い中空状のものであり、且つその長手方向に２つ以上のブレード部材に分割され、
前記風車ブレードの分割部位において隣接するブレード部材同士に跨るように筒状の接続部材が内挿され、
前記接続部材とブレード部材とが風車ブレードの略全周に亘って複数の締結部材により結合されてなることを特徴とする風力発電機の風車ブレード構造。It is a structure of a plurality of wind turbine blades attached to extend in the radial direction with respect to the rotation axis of the wind turbine of the wind generator,
Each of the windmill blades is a hollow shape that is long in the radial direction of the windmill, and is divided into two or more blade members in the longitudinal direction,
A tubular connecting member is inserted so as to straddle adjacent blade members in the divided portion of the wind turbine blade,
A wind turbine blade structure for a wind power generator, wherein the connecting member and the blade member are joined by a plurality of fastening members over substantially the entire circumference of the wind turbine blade. 請求項１において、
風車ブレードは、少なくとも長手方向の中央位置よりも基端側で分割され、
締結部材は、それぞれ、ブレード部材又は接続部材の何れか一側からそれらを貫通するボルトと、該ブレード部材又は接続部材の他側に配設されて前記ボルトの先端側に螺合するナットとからなることを特徴とする風力発電機の風車ブレード構造。In claim 1,
The wind turbine blade is divided at least on the proximal side from the central position in the longitudinal direction,
Each of the fastening members includes a bolt that penetrates the blade member or the connection member from one side thereof, and a nut that is disposed on the other side of the blade member or the connection member and that is screwed to a tip side of the bolt. A wind turbine blade structure for a wind power generator. 請求項１において、
風車ブレードは、少なくとも長手方向の中央位置よりも先端側で分割され、
締結部材は、それぞれ、前記風車ブレードをその厚み方向の一側から他側まで貫通するボルトと、このボルトに螺合するナットとからなることを特徴とする風力発電機の風車ブレード構造。In claim 1,
The wind turbine blade is divided at least on the tip side from the central position in the longitudinal direction,
The fastening member comprises a bolt penetrating the wind turbine blade from one side to the other side in a thickness direction of the wind turbine blade and a nut screwed to the bolt, and a wind turbine blade structure of a wind power generator. 請求項１〜３のいずれか１つにおいて、
接続部材には、風車ブレードの内部空間を長手方向に区画するように節部が設けられていることを特徴とする風力発電機の風車ブレード構造。In any one of claims 1 to 3,
The connection member is provided with a node so as to partition an internal space of the wind turbine blade in a longitudinal direction, wherein the wind turbine blade structure of a wind power generator is provided. 風力発電機の風車の回転軸に対してそれぞれ径方向に延びるように取り付けられる複数枚の風車ブレードの構造であって、
前記各風車ブレードは、それぞれ、風車の径方向に長い中空状のものであり、且つその長手方向に２つ以上のブレード部材に分割され、
前記風車ブレードの分割部位において隣接するブレード部材の端部には、それぞれ周壁部から内方に向かって突出する環状のフランジ部が形成され、
前記フランジ部の厚みがその突出量よりも大きく設定され、
互いに接合された前記フランジ部同士がそれらを風車ブレードの長手方向に貫通し且つ該風車ブレードの略全周に亘るように設けられた複数の締結部材により結合されてなることを特徴とする風力発電機の風車ブレード構造。It is a structure of a plurality of wind turbine blades attached to extend in the radial direction with respect to the rotation axis of the wind turbine of the wind generator,
Each of the windmill blades is a hollow shape that is long in the radial direction of the windmill, and is divided into two or more blade members in the longitudinal direction,
At the end of the blade member adjacent to the divided portion of the wind turbine blade, an annular flange portion is formed to protrude inward from the peripheral wall portion, respectively.
The thickness of the flange portion is set to be larger than the protrusion amount,
A wind power generator, wherein the flange portions joined to each other penetrate them in the longitudinal direction of the wind turbine blade and are connected by a plurality of fastening members provided substantially over the entire circumference of the wind turbine blade. Machine windmill blade structure. 風力発電機の風車の回転軸に対してそれぞれ径方向に延びるように取り付けられる複数枚の風車ブレードの構造であって、
前記各風車ブレードは、それぞれ、風車の径方向に長い中空状のものであり、且つその長手方向に２つ以上のブレード部材に分割され、
前記風車ブレードの分割部位において隣接するブレード部材の一方の端部には、他方のブレード部材の端部に内挿される筒状の挿入部が形成され、
前記挿入部のブレード長手方向の寸法がブレード厚み方向の寸法よりも大きく設定され、
前記ブレード部材の挿入部と隣接するブレード部材の端部とが、風車ブレードの略全周に亘って複数の締結部材により結合されてなることを特徴とする風力発電機の風車ブレード構造。It is a structure of a plurality of wind turbine blades attached to extend in the radial direction with respect to the rotation axis of the wind turbine of the wind generator,
Each of the windmill blades is a hollow shape that is long in the radial direction of the windmill, and is divided into two or more blade members in the longitudinal direction,
At one end of the adjacent blade member at the divided portion of the wind turbine blade, a cylindrical insertion portion inserted into the end of the other blade member is formed,
The dimension in the blade longitudinal direction of the insertion portion is set to be larger than the dimension in the blade thickness direction,
A wind turbine blade structure for a wind power generator, wherein an insertion portion of the blade member and an end of the adjacent blade member are joined by a plurality of fastening members over substantially the entire circumference of the wind turbine blade.
JP2002170380A 2002-06-11 2002-06-11 Wind mill blade structure for wind power generator Pending JP2004011616A (en)

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