A wind turbine blade root connection structure and manufacturing method thereof

Abstract

The invention discloses a blade root connecting structure of a wind-driven generator. The blade root connecting structure is that a blade of the wind-driven generator is of a hollow structure, and glass fiber reinforced plastics are the main structural materials of the blade; the blade comprises a half block serving as a front surface, and another half block serving as a back flow surface, wherein housings of the two half blocks are integrally adhered; the root end of the blade is regularly circular; a plurality of connecting bolts, which are circumferentially uniformly distributed and connected with a hub of a wind wheel, are arranged on the end surface of the root of the blade; a transition connecting part is arranged at the root part of the blade and fixedly connected with the blade; the connecting bolts are arranged on the transition connecting part. According to the blade root connecting structure of the wind-driven generator, circular metal barrels are adopted for performing transition connection, so that the blade can be avoided secondary damage during hole drilling; the quantity of the connecting bolts and the pitch circular diameter can be flexibly adjusted according to the dimension requirements of hubs of different units; in addition, the quantity of the connecting bolts is more than that of the connecting bolts in the previous methods, so that the design requirements can be met.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and relates to a wind rotor blade of a wind power generator, in particular to a blade root connection structure of the blade. Background technique [0002] In recent years, with the continuous improvement of the power of wind turbines, the length and weight of wind turbine blades have also increased rapidly, and the load on the root end of the blades has also increased. At present, the root bending moment of the 6MW wind turbine blade has reached about 30MNm. Such a large bending moment has brought great difficulties to the design of the blade root connection structure. [0003] Wind power blades are of hollow structure, usually vacuum infusion molding is used to infuse the two halves of the upstream side and the backflow side respectively, and then bond the two halves together. The contour of the root end of the blade is a perfect circle, and many bolts are arranged on the end surf...

AI Technical Summary

Problems solved by technology

The advantage is that it is very convenient to replace the screw rod. The disadvantage is that due to the large area of ​​the hole for placing the nut on the wall, the number of bolts allowed to be arranged is limited by the strength of the hole where the blade nut is placed, and the static strength and fatigue strength of the bolts and blade root FRP are difficult Meet the design requirements

[0004] In the above two structures, the bolts are pre-installed on the blades. When installing the blades, it is difficult to align with the bolt holes of the hub.

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