A wind turbine blade is described having a pitch system coupling which is adapted to allow fasteners, such as bolts, of such a coupling to be tightened from the inside of the blade. This removes the need for relatively difficult and expensive external maintenance operations to tighten pitch coupling
A wind turbine blade is described having a pitch system coupling which is adapted to allow fasteners, such as bolts, of such a coupling to be tightened from the inside of the blade. This removes the need for relatively difficult and expensive external maintenance operations to tighten pitch coupling bolts. The coupling is arranged to present first and second internal bearing surfaces, against which the bolts of the pitch coupling can be tightened. The coupling may comprise a shaped end portion of an inner blade section, and/or the pitch system may comprise an additional bolting collar to facilitate this arrangement.
대표청구항▼
1. A method for mounting a pitch system in a partial pitch wind turbine blade (18, 20) of at least 35 metres length, the blade (18, 20) having a substantially hollow blade body with an inner blade section (24, 26) and outer blade section (28, 30) between which there is provided a pitch system for pi
1. A method for mounting a pitch system in a partial pitch wind turbine blade (18, 20) of at least 35 metres length, the blade (18, 20) having a substantially hollow blade body with an inner blade section (24, 26) and outer blade section (28, 30) between which there is provided a pitch system for pitching the outer blade section (28, 30) relative to the inner blade section (24, 26); characterised in that the method comprises fastening the inner blade section (24, 26) to the pitch system by a fastening action performed only from inside the hollow blade body. 2. The method according to claim 1, wherein the pitch system comprises first (120) and second (122) pitch rings, the second pitch ring (122) rotatable relative to the first pitch ring (120);wherein the blade comprises an inner blade section (24, 26) having a root end (18a, 20a) and a first pitch end (102); the first pitch end (102) being configured for coupling to the first pitch ring (120) by a first plurality of fasteners (110, 126); the first plurality of fasteners (110, 126) having first means (126) for securing the first plurality of fasteners (110, 126), the first means (126) being configured such that securing of the first means (126) fastens the first pitch end (102) to the first pitch ring (120); andwherein the blade further comprises an outer blade section (28, 30) having a second pitch end (114) and a tip end (18b, 20b); the second pitch end (114) being configured for coupling to the second pitch ring (122) of the pitch system by a second plurality of fasteners (116, 128); the second plurality of fasteners (116, 128) having second means (128) for securing the second plurality of fasteners (116, 128), the second means (128) being configured such that securing of the second means (128) fastens the second pitch end (114) to the second pitch ring (122); wherein the second means (128) are only accessible from an interior of the wind turbine blade (18, 20); wherein the outer blade section (28, 30) is pitchable relative to the inner blade section (24, 26) by rotating the second pitch ring (122) relatively to the first pitch ring (120); wherein the method comprises fastening the second pitch end (114) to the second pitch ring by securing said second means (126) only from the interior of said wind turbine blade (18, 20); wherein the method comprises fastening the first pitch end (102) to the first pitch ring (120) by securing said first means (116) only from the interior of said wind turbine blade (18, 20). 3. The method of claim 2, wherein the first pitch end (102) comprises a first bearing surface (106) on an interior of the inner blade section (24, 26), wherein the method comprises abutting the first bearing surface (106) against the first pitch ring (120) and fastening it by securing the first means (126). 4. The method of claim 3, wherein the first plurality of fasteners (110, 126) comprises first bolts (110) and first nuts (126), and wherein the first means are the first nuts (126); wherein the first bolts (110) extend through the first pitch ring (120) and into the first pitch end (102); and wherein the first means (126) and the first bearing surface (106) are provided on opposite sides of the first pitch ring (102) for clamping the first pitch ring (120) against the first bearing surface (106). 5. The method of claim 2, wherein the first plurality of fasteners (110, 126) comprises first bolts (110) and first nuts (126), and wherein the first means are the first nuts (126); wherein the second plurality of fasteners (116, 128) comprises second bolts (116) and second nuts (128), and wherein the second means are the second nuts (128), wherein the securing of the first means (126) and second means (128) comprises tightening the first and second nuts, respectively. 6. A partial pitch wind turbine blade (18, 20) of at least 35 metres length, the blade (18, 20) having a substantially hollow blade body, the blade comprising: a pitch system having first (120) and second (122) pitch rings, the second pitch ring (122) being rotatable relative to the first pitch ring (120);an inner blade section (24, 26) having a root end (18a, 20a) and a first pitch end (102); the first pitch end (102) of the inner blade section (24, 26) being coupled to the first pitch ring (120) by a first plurality of fasteners (110, 126); the first plurality of fasteners (110, 126) having first means (126) for securing the first plurality of fasteners (110, 126), the first means (126) being configured such that securing of the first means (126) fastens the inner blade section (24, 26) to the first pitch ring (120); andan outer blade section (28, 30) having a second pitch end (114) and a tip end (18b, 20b); the second pitch end (114) of the outer blade section (28, 30) being coupled to the second pitch ring (122) of the pitch system by a second plurality of fasteners (116, 128); the second plurality of fasteners (116, 128) having second means (128) for securing the second plurality of fasteners (116, 128), the second means (128) being configured such that a securing of the second means (128) fastens the inner blade section (24, 26) to the second pitch ring (122); wherein the second means (128) are only accessible from an interior of the wind turbine blade (18, 20); wherein the outer blade section (28, 30) is pitchable relative to the inner blade section (24, 26) by rotating the second pitch ring (122) relatively to the first pitch ring (120); characterised in that the blade is configured for fastening the inner blade section (24, 26) to the first pitch (120) ring only by securing the first means (126), and wherein the first means (126) are accessible only from the interior of the wind turbine blade (18, 20). 7. The blade of claim 6, wherein the first pitch end (102) comprises a first bearing surface (106) on an interior of the inner blade section (24, 26), wherein the first bearing surface (106) abuts the first pitch ring (120) and is fastened to it by the first fasteners (110, 126). 8. The blade of claim 7, wherein the first pitch end (102) has an inner flange (104), the inner flange (104) comprising the first bearing surface (106), and wherein the first pitch ring (120) of the pitch system is fastened to the first bearing surface (106) of the inner flange (104) by the first plurality of fasteners (110, 126). 9. The blade of claim 8, wherein the first plurality of fasteners (110, 126) comprises first bolts (110) and first nuts (126), and wherein the first means are the first nuts (126); wherein the first means (126) and the first bearing surface (106) are provided on opposite sides of the first pitch ring (102) for clamping the first pitch ring (120) against the first bearing surface (106); wherein the inner flange (104) comprises a plurality of blind holes (108) extending from the first bearing surface (106) of the inner flange (104) into the wind turbine blade body at the inner flange (104), wherein the first bolts (110) extend through the first pitch ring (120) into the blind holes (108). 10. The blade of claim 8, wherein the first plurality of fasteners (110, 126) comprises first bolts (110) and first nuts (126), and wherein the first means are the first nuts (126); wherein the first bolts (110) extend through the first pitch ring (120) and into the first pitch end (102); and wherein the first means (126) and the first bearing surface (106) are provided on opposite sides of the first pitch ring (102) for clamping the first pitch ring (120) against the first bearing surface (106). 11. The blade of claim 7, wherein the first bearing surface (106) is orthogonal to a longitudinal axis of the inner blade section (24, 26). 12. The blade of claim 11, wherein the first plurality of fasteners (110, 126) comprises first bolts (110) and first nuts (126), and wherein the first means are the first nuts (126); wherein the first bolts (110) extend through the first pitch ring (120) and into the first pitch end (102); and wherein the first means (126) and the first bearing surface (106) are provided on opposite sides of the first pitch ring (102) for clamping the first pitch ring (120) against the first bearing surface (106). 13. The blade of claim 7, wherein the first plurality of fasteners (110, 126) comprises first bolts (110) and first nuts (126), and wherein the first means are the first nuts (126); wherein the first bolts (110) extend through the first pitch ring (120) and into the first pitch end (102); and wherein the first means (126) and the first bearing surface (106) are provided on opposite sides of the first pitch ring (102) for clamping the first pitch ring (120) against the first bearing surface (106). 14. The blade of claim 6, wherein the first plurality of fasteners (110, 126) comprises first bolts (110) and first nuts (126), and wherein the first means are the first nuts (116); wherein the second plurality of fasteners (116, 128) comprises second bolts (116) and second nuts (128), and wherein the second means are the second nuts (128).
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이 특허에 인용된 특허 (3)
Stommel, Matthias, Rotor blade and wind energy installation.
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