Variable pitch device for wind turbine

A wind turbine and blade root technology, applied in the field of wind turbine pitch devices, can solve the problems of high cost, increased pitch frequency, and high cost of alternating loads, and achieve the effects of load balance and increased wind catching capability

Pending Publication Date: 2019-09-17
中国大唐集团新能源科学技术研究院有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The independent pitch control method can effectively reduce the alternating load, but the corresponding cost is also high, because it increases

Method used

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  • Variable pitch device for wind turbine
  • Variable pitch device for wind turbine

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[0016] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientation or positional relationship indicated by "vertical", "horizontal", "top", "bottom", "inner", "outer" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the invention And to simplify the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the invention.

[0018] The terms "installation", "connectio...

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Abstract

The invention discloses a variable pitch device for a wind turbine. The variable pitch device comprises a blade root, an air cylinder barrel, a pressure adjusting piston and a driving mechanism, wherein the blade root is a column-shaped body; an opening in the end of the blade root is sealed; the air cylinder barrel is used for fixing a hub of the wind turbine; two ends of the air cylinder barrel are opened; one end of the wall of an inner cavity of the air cylinder barrel is matched with the column-shaped body of the blade root by a spiral groove and a spiral guide rail structure; the pressure regulating piston is arranged at the other end of the wall of the inner cavity of the air cylinder barrel, and a sealing space is defined by a sealing end of the blade root and the pressure adjusting piston in the air cylinder barrel; and the driving mechanism is used for driving the pressure adjusting piston to expand and retract in the other end of the air cylinder barrel to further adjust the pressure in the air cylinder barrel; a blade of the wind turbine drives the blade root to expand and retract in the inner cavity of the air cylinder barrel under the self gravity and the air pressure action in the air cylinder barrel in the rotating process, and when the blade root expands and retracts, the spiral groove and the spiral guide rail structure automatically drive the blade to twist. The variable pitch device can reliably inhibit alternating load.

Description

technical field [0001] The invention relates to a wind turbine, in particular to a wind turbine pitch changing device. Background technique [0002] As a renewable green energy source, wind turbines only need to utilize the kinetic energy of the wind. The cost of wind energy utilization is mainly composed of three aspects: manufacturing, installation and commissioning, and operation and maintenance. Among them, lean manufacturing of equipment is the foundation. Considering the cost of wind turbines, there are two technical paths to improve economy. One is to reduce the cost of main components through fine design, and the other is to extend the operating life of key components. For technical transformation of in-service blades which accounts for 20% of the cost of the whole machine, the latter is a more feasible way. [0003] The design life of a wind turbine is more than 20 years. Taking a 2MW unit as an example, its blades will rotate about 10 8 On a weekly basis, it is ...

Claims

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Application Information

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IPC IPC(8): F03D7/02F03D1/06
CPCF03D1/0675F03D7/0224F05B2270/605Y02E10/72
Inventor 陈洪胜孙涛刘燕党群陈继录吴智泉
Owner 中国大唐集团新能源科学技术研究院有限公司
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