发明名称 |
HYDRAULIC PITCH SYSTEM FOR A WIND TURBINE |
摘要 |
The present invention relates to a hydraulic pitch system for pitching a blade of a wind turbine having a hub by means of a hydraulic fluid. The system comprises at least one hydraulic cylinder for adjusting a pitch angle of the blade, the hydraulic cylinder comprising a pitch piston movable in the hydraulic cylinder, and a first port and a second port arranged on each side of the pitch piston, and an accumulator hydraulically connected to the cylinder. The system further comprises a pitch safety system adapted to maintain the blade in a predetermined pitch angle when a person is entering the hub of the wind turbine for service and/or maintenance, the pitch safety system comprising a first valve which by activation releases a pressure in the hydraulic pitch system by draining off the accumulator for the hydraulic fluid until the pressure has reached a predetermined pressure level. |
申请公布号 |
US2014328679(A1) |
申请公布日期 |
2014.11.06 |
申请号 |
US201214361968 |
申请日期 |
2012.11.28 |
申请人 |
Vestas Wind Systems A/S |
发明人 |
Nielsen Jakob Hviid;Nielsen Soren Kjaer;Mølgaard Jeppesen Ole;Neubauer Jesper Lykkegaard |
分类号 |
F03D7/02;F03D7/04 |
主分类号 |
F03D7/02 |
代理机构 |
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代理人 |
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主权项 |
1. A hydraulic pitch system for pitching a blade of a wind turbine having a hub by means of a hydraulic fluid, comprising:
at least one hydraulic cylinder for adjusting a pitch angle of the blade, the hydraulic cylinder comprising a pitch piston movable in the hydraulic cylinder, and a first port and a second port arranged on each side of the pitch piston, and an accumulator hydraulically connected to the cylinder,further comprising a pitch safety system adapted to maintain the blade in a predetermined pitch angle when a person is entering the hub of the wind turbine for service and/or maintenance, the pitch safety system comprising a first valve which by activation releases a pressure in the hydraulic pitch system by draining off the accumulator for the hydraulic fluid until the pressure has reached a predetermined pressure level. |
地址 |
Aarhus N. DK |