WO2012168990A1 - T-bolt attachment of a blade root of a wind turbine - Google Patents

T-bolt attachment of a blade root of a wind turbine Download PDF

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Publication number
WO2012168990A1
WO2012168990A1 PCT/JP2011/006903 JP2011006903W WO2012168990A1 WO 2012168990 A1 WO2012168990 A1 WO 2012168990A1 JP 2011006903 W JP2011006903 W JP 2011006903W WO 2012168990 A1 WO2012168990 A1 WO 2012168990A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
longitudinal
bolts
wind turbine
bearing ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2011/006903
Other languages
English (en)
French (fr)
Inventor
Bernd SEUFERT
Andreas CREMER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Euros Entwicklungsgesellschaft fuer Windkraftanlagen mbH
Mitsubishi Heavy Industries Ltd
Original Assignee
Euros Entwicklungsgesellschaft fuer Windkraftanlagen mbH
Mitsubishi Heavy Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=44502195&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2012168990(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Euros Entwicklungsgesellschaft fuer Windkraftanlagen mbH, Mitsubishi Heavy Industries Ltd filed Critical Euros Entwicklungsgesellschaft fuer Windkraftanlagen mbH
Priority to EP11799885.6A priority Critical patent/EP2558716B1/en
Priority to KR1020137003865A priority patent/KR20130066662A/ko
Priority to US13/390,106 priority patent/US20140079555A1/en
Priority to CN2011800407826A priority patent/CN103154505A/zh
Priority to JP2012509806A priority patent/JP5597697B2/ja
Publication of WO2012168990A1 publication Critical patent/WO2012168990A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D1/00—Wind motors with rotation axis substantially parallel to the air flow entering the rotor 
    • F03D1/06—Rotors
    • F03D1/065—Rotors characterised by their construction elements
    • F03D1/0658—Arrangements for fixing wind-engaging parts to a hub
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/30—Retaining components in desired mutual position
    • F05B2260/301—Retaining bolts or nuts
    • 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

Definitions

  • the present invention relates to a wind turbine comprising multiple cross holes and longitudinal holes for cross bolts and longitudinal bolts in the wall of the wind turbine blade wherein at least one longitudinal bolt is disposed within the thickness direction of the wall of the blade to connect the blade to an inner or outer bearing ring of a bearing.
  • wind turbines comprise a hub structure to which the blades are connected in a connection area at their root end.
  • Many wind turbines comprise pitch bearings with an inner and an outer bearing ring to rotate the mounted blades around their longitudinal axis respectively.
  • each rotor blade is connected to the inner or outer bearing ring of the corresponding pitch bearing, while the hub is connected to the other bearing ring.
  • the hub is usually made of cast steel and its geometry helps in letting it bear extreme loads transmitted from the blades.
  • a bearing ring has a geometric ring shape which is much more prone to damages due to the heavy load which are transmitted through it from the blades to the hub.
  • a further object of the invention is to improve the load transmittance of the connection in such a way that correlated problems such as deformations of the bearing rings of the wind turbine are prevented.
  • the blade comprises multiple holes in its wall for the insertion of bolts.
  • the term "thickness direction” corresponds to a transverse direction or cross direction of a section of the blade wall wherein the opposite blade wall section is not included.
  • the thickness direction is substantially perpendicular to a center line of the blade wall section. In the case of a blade with a constant wall thickness, the thickness direction is substantially perpendicular to the wall of the blade.
  • the blade is connected to the inner or outer bearing ring by means of the cross bolts and the longitudinal bolts inserted in the cross holes and longitudinal holes in the wall of the blade respectively.
  • at least two longitudinal bolts are mounted in thickness direction behind each other. Therefore, a plurality of longitudinal bolts is disposed within one wall section in thickness direction. In this way, a strong connection between the blade and the inner or the outer bearing ring is established. Applying more than one longitudinal bolt in thickness direction increases the length of connection between blade and inner or outer bearing ring in cross direction of the blade on which forces are transmitted. Instead of a point to point connection, several points of connection are established which increase the strength and life time of the connection. In the long run, this results in less correlated problems with the high load transmittance between blade and hub, such as deformations of the bearing rings.
  • the connecting elements of the connection are arranged in an especially compact way, allowing significantly more connecting elements while keeping almost identical outer dimensions for the component so that significantly more static and dynamic loads are transferred. It is also possible to reduce the component dimensions considerably while maintaining equal loads to achieve manufacturing and logistical advantages.
  • the longitudinal bolts are located especially close to neighboring equipment or within blade sections and all have the same construction. Arranging multiple rows of longitudinal bolts in thickness direction within the component walls results in a very tight placement of connecting elements.
  • the cross bolts are disposed within the cross holes and comprise at least one hole for receiving at least part of the longitudinal bolts, namely the tip area of the longitudinal bolts.
  • These holes within the cross bolts are either blind holes or through holes.
  • each longitudinal bolt is mounted in an independent cross bolts respectively.
  • multiple longitudinal bolts are disposed into only one cross bolt.
  • the cross holes for the cross bolts are preferably arranged in thickness direction of the blade so that one cross bolt can receive multiple longitudinal bolts in thickness direction.
  • the cross bolts inserted in the cross holes have a small flattening at their backs. The flattened backs of the cross bolts result in an easier production.
  • the at least one longitudinal bolt is made of fiber reinforced material, preferably carbon fiber reinforced plastic. Even though the stiffness of fiber reinforced material is lower than the one of steel, the material possesses high strength, less weight and lengthwise flexibility. These characteristics of material result in different advantages when using bolts out of fiber reinforced material instead of conventional bolts out of steel.
  • the at least one longitudinal bolt out of fiber reinforced material comprises a thread.
  • the holes in the blade wall can comprise threaded inside walls or threaded inserts in which the tread of the longitudinal bolt can take hold when being inserted into one of the holes.
  • the longitudinal bolt out of fiber reinforced material only comprises a thread on the part of the bolt which comes to rest inside the inner or outer bearing ring when being completely inserted into the hole. On the part of the bolt which comes to rest inside the blade or the cross bolt there is no thread.
  • the longitudinal bolt out of fiber reinforced material can be bonded into its surrounding structure to provide the connection with additional strength. This is especially effective as the blade itself usually comprises fiber reinforced material so that a high bonding strength is assured.
  • the stiffness of the connection between blade and the inner bearing ring is adapted to the stiffness of the connection between the outer bearing ring and the hub by tightening the multiple longitudinal bolts which are inserted in thickness direction of the blade.
  • the term "stiffness" of a component in general describes the resistance of the component against distortions or deformations which are caused by forces or torques acting on the component. This stiffness depends on the geometry and material characteristics of the component such as the elasticity.
  • the stiffness of a connection of two components depends on the stiffness of the two components, i.e. the materials and geometries, and on the type and strength of the connection itself.
  • the blade is connected to the outer bearing ring wherein the stiffness of said connection between the blade and the outer bearing ring corresponds to the stiffness of the connection between the inner bearing ring and the hub.
  • the plurality of longitudinal bolts in thickness direction is arranged in a plurality of ring-shaped rows within corresponding longitudinal holes in the wall of the blade.
  • the blade wall comprises two ring-shaped rows of longitudinal holes for receiving longitudinal bolts.
  • the rows are considered to be ring-shaped because they extend along the entire circumference of the blade.
  • the ring-shaped rows have preferably a constant distance to each other along the entire circumference of the blade.
  • longitudinal bolts of different rows are arranged in the blade wall along a line which is perpendicular to a center line of the blade wall.
  • longitudinal bolts of different ring-shaped rows are arranged in a staggered way in the thickness direction of the blade.
  • the distance between the longitudinal bolts which are disposed within the blade wall in thickness direction amounts between 20 % and 90 %, preferably between 30 % and 80 %, especially preferably between 40 % and 70%, of the blade wall thickness at its root end.
  • the term distance refers to the distance between the centers of two neighboring bolts in thickness direction.
  • Figure 1 is a cross sectional view of a blade wall and an inner bearing ring of a pitch bearing
  • Figure 2 is a cross sectional view of a blade wall and an inner bearing ring of a pitch bearing
  • Figure 3 is a side view of a blade wall and an inner bearing ring of a pitch bearing.
  • Figure 1 shows a cross sectional view of a blade wall 11 and an inner bearing ring 17 of a pitch bearing in thickness direction 22 of a wind turbine.
  • the blade wall 11 comprises a cross hole 12 for the insertion of cross bolts in which in this particular embodiment of the invention two cross bolts 13a, 13b are disposed.
  • the inner face sides of the cross bolts 13a, 13b abut on each other.
  • the blade wall 11 comprises longitudinal holes for the insertion of longitudinal bolts which are arranged in two ring-shaped rows each extending along the circumference of the blade. The two rows are arranged in thickness direction 22 of the blade wall 11 one behind the other and within each row the longitudinal bolts are arranged in uniform intervals.
  • two longitudinal holes 15a, 15b namely one longitudinal hole of each ring-shaped row, are displayed in which one longitudinal bolt 16a, 16b is disposed respectively.
  • the holes 15a, 15b and the longitudinal bolts 16a, 16b are adapted such that they form a clearance fit so that once the longitudinal bolts 16a, 16b are disposed in the longitudinal holes 15a, 15b a clearance 23 between the inner wall of the longitudinal holes 15a, 15b and the longitudinal bolts 16a, 16b exists.
  • the longitudinal bolts 16a, 16b of the two different ring-shaped rows are arranged within the blade wall 11 perpendicular to the center line of the blade wall 11 and therefore arranged in thickness direction 22 of the blade wall 11.
  • Each longitudinal bolt 16a, 16b is mounted in a separate cross bolt 13a, 13b respectively.
  • the cross bolts 13a, 13b comprise one hole 14a, 14b respectively.
  • the holes 14a, 14b within the cross bolts 13a, 13b for the insertion of part of the longitudinal bolts 16a, 16b are blind holes. Only the end areas 16aa, 16ba of each longitudinal bolt 16a, 16b is inserted in the cross bolts 13a, 13b. These end areas 16aa, 16ba comprise threads and are screwed into mating threads disposed in the holes 14a, 14b.
  • the blade is connected to the inner bearing ring 17 of a pitch bearing. Therefore, the inner bearing ring 17 comprises two longitudinal holes 18a, 18b for the insertion of the longitudinal bolts 16a, 16b.
  • the inner bearing ring 17 is braced to the blade wall 11 by means of the longitudinal bolts 16a, 16b and the nuts 21a, 21b.
  • Figure 2 shows a cross sectional view of a blade wall 11 and an inner bearing ring 17 of a pitch bearing in thickness direction 22 of another embodiment of the present invention.
  • one cross bolt 13 is disposed in one cross hole 12 and two longitudinal bolts 20a, 20b made of fiber reinforced material are disposed in two longitudinal holes 15a, 15b.
  • the two longitudinal bolts 20a, 20b made out of fiber reinforced material are both mounted in one cross bolt 13.
  • the cross bolt 13 comprises two blind holes 14a, 14b into which the end areas 20aa, 20ba of the longitudinal bolts 20a, 20b are bonded.
  • the cross bolt 13 comprises a flattening 19 on its back side which results in an easier assembly of it.
  • the assembly of the longitudinal bolts 20a, 20b and the cross bolt 13 connect the inner bearing ring 17 of a pitch bearing to the blade wall 11.
  • the inner bearing ring 17 comprises two holes 18a, 18b in longitudinal direction for the insertion of the longitudinal bolts 20a, 20b and is braced to the blade wall by means of the longitudinal bolts 20a, 20b and the nuts 21a, 21b.
  • Figure 3 shows a side view on a blade wall 11 and the inner bearing ring 17 of a pitch bearing wherein the blade wall 11 is partly not depicted so that a longitudinal bolt 16a which is disposed within a longitudinal hole 15 within the blade wall 11 is shown.
  • the longitudinal bolt 16a is mounted in a cross bolt 13a which extends into the image plane and is inserted in a longitudinal hole 18 of the inner bearing ring 17. Additionally, the longitudinal bolt 16a is braced via a nut 21a.
  • another cross bolt 13b with another longitudinal bolt 16b is indicated wherein the other longitudinal bolt is also braced by means of a nut 21b.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)
PCT/JP2011/006903 2011-06-09 2011-12-09 T-bolt attachment of a blade root of a wind turbine Ceased WO2012168990A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP11799885.6A EP2558716B1 (en) 2011-06-09 2011-12-09 T-bolt attachment of a blade root of a wind turbine
KR1020137003865A KR20130066662A (ko) 2011-06-09 2011-12-09 풍력 터빈의 블레이드 루트의 t자형-볼트 부착
US13/390,106 US20140079555A1 (en) 2011-06-09 2011-12-09 Wind turbine
CN2011800407826A CN103154505A (zh) 2011-06-09 2011-12-09 风力涡轮机的叶片根部的t型螺栓连接
JP2012509806A JP5597697B2 (ja) 2011-06-09 2011-12-09 風車

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202011101634.3 2011-06-09
DE202011101634U DE202011101634U1 (de) 2011-06-09 2011-06-09 Rotorblattverbindung

Publications (1)

Publication Number Publication Date
WO2012168990A1 true WO2012168990A1 (en) 2012-12-13

Family

ID=44502195

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2011/006903 Ceased WO2012168990A1 (en) 2011-06-09 2011-12-09 T-bolt attachment of a blade root of a wind turbine

Country Status (7)

Country Link
US (1) US20140079555A1 (enExample)
EP (1) EP2558716B1 (enExample)
JP (1) JP5597697B2 (enExample)
KR (1) KR20130066662A (enExample)
CN (1) CN103154505A (enExample)
DE (1) DE202011101634U1 (enExample)
WO (1) WO2012168990A1 (enExample)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011088025A1 (de) 2011-12-08 2013-06-13 Wobben Properties Gmbh Rotorblatt
EP2623771A1 (en) * 2012-02-03 2013-08-07 E.On Climate and Renewables UK Ltd. Wind turbine blade mounting element and method of repair
DE102014005452B4 (de) 2014-04-07 2015-12-24 Windnovation Engineering Solutions Gmbh Blattanschluss für Rotorblätter
DK3129644T3 (da) 2014-04-07 2020-11-30 Wobben Properties Gmbh Rotorvinge af et vindenergianlæg
DE202014007558U1 (de) * 2014-09-22 2014-11-18 Wpt Nord Gmbh Bohrwerkzeug zur Modifikation einer Sacklochbohrung
US9777704B2 (en) 2014-11-03 2017-10-03 General Electric Company Rotor blade assembly for a wind turbine having variable-length blade bolts
DK3064768T3 (da) * 2015-03-04 2019-07-29 Siemens Gamesa Renewable Energy As Vindmøllerotorvinge og fremgangsmåde til montering af en vindmøllerotorvinge
EP3163071B8 (en) * 2015-10-29 2020-05-27 GE Renewable Technologies Wind B.V. Automatic tightening of bolts
EP3390810B1 (en) 2015-12-14 2021-02-17 Vestas Wind Systems A/S Joint for connecting a wind turbine rotor blade to a rotor hub and associated method
NL2021862B1 (en) 2018-10-23 2020-05-13 Itrec Bv Installation of a wind turbine blade on a hub of a wind turbine
ES2940570T3 (es) * 2020-01-15 2023-05-09 Siemens Gamesa Renewable Energy As Porción de raíz de una pala de turbina eólica, pala de turbina eólica, conjunto de raíz y turbina eólica
CN113153623A (zh) * 2021-05-06 2021-07-23 上海电气风电集团股份有限公司 风轮装置及风力发电机组
EP4092261A1 (en) 2021-05-21 2022-11-23 Nordex Energy SE & Co. KG A wind turbine rotor blade element with connection assemblies
CN114320782A (zh) * 2022-01-05 2022-04-12 上海电气风电集团股份有限公司 风电叶片及其制造方法、风力发电机
CN114320737B (zh) * 2022-01-05 2025-03-28 上海电气风电集团股份有限公司 风电叶片及其制造方法
KR102707859B1 (ko) * 2022-11-22 2024-09-23 두산에너빌리티 주식회사 루트부 체결력이 향상된 블레이드 및 이를 포함하는 풍력발전기
CN116066287B (zh) * 2022-12-28 2025-07-08 无锡太湖学院 一种带转接法兰的大型风力机叶片预埋型螺栓连接结构

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US5171099A (en) * 1990-11-01 1992-12-15 The Boeing Company Apparatus to attach a sandwich panel
DE19733372C1 (de) 1997-08-01 1999-01-07 Aloys Wobben Rotorblatt und Rotor einer Windenergieanlage
US20030205011A1 (en) * 2001-02-22 2003-11-06 Franck Bequet Device for joining a panel and a structure, able to transmit significant forces
DE10324166B4 (de) 2003-05-28 2005-05-04 Aloys Wobben Rotorblattanschluss

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DE102006014742B4 (de) 2006-03-30 2008-01-24 Nordex Energy Gmbh Rotorblatt für Windenergieanlagen
DE102006022279B4 (de) * 2006-05-11 2016-05-12 Aloys Wobben Rotorblatt für eine Windenergieanlage
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Publication number Priority date Publication date Assignee Title
US5171099A (en) * 1990-11-01 1992-12-15 The Boeing Company Apparatus to attach a sandwich panel
DE19733372C1 (de) 1997-08-01 1999-01-07 Aloys Wobben Rotorblatt und Rotor einer Windenergieanlage
US20030205011A1 (en) * 2001-02-22 2003-11-06 Franck Bequet Device for joining a panel and a structure, able to transmit significant forces
DE10324166B4 (de) 2003-05-28 2005-05-04 Aloys Wobben Rotorblattanschluss

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ERICH HAU: "Wind power plants", 1996, SPRINGER VERLAG, pages: 206 - 209

Also Published As

Publication number Publication date
JP2013533936A (ja) 2013-08-29
US20140079555A1 (en) 2014-03-20
DE202011101634U1 (de) 2011-07-14
CN103154505A (zh) 2013-06-12
JP5597697B2 (ja) 2014-10-01
EP2558716B1 (en) 2015-12-09
EP2558716A1 (en) 2013-02-20
KR20130066662A (ko) 2013-06-20

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