Kind of multi-beam structure of large-size wind turbine blades and their production methods

Species and large size wind turbine blade manufacturing method of a multi-beam configuration using hollow layout structure, comprising a blade skin suction side, pressure side of the blade skin, and the main load-bearing structural beam shear webs, the vane suction side of the blade skin skin pressure side are combined to form a streamlined cross section of the cavity structure, the inner cavity structure the suction side of the blade skin of the blade pressure side are combined to form the skin is arranged by the primary load-bearing structure is formed and the shear web girders in combination a support structure; suction side of the blade skin of the blade pressure side of the skin are based on multi-stage structure, and connected together to form a suction side of the blade skin of the blade pressure side skin, respectively entirety multistage side of the main load-bearing girder structure . The present invention in ensuring the stiffness of the blade, the strength of the premise of improving anti-buckling capability of the blade structure, by using high modulus carbon fiber plies, can significantly reduce the weight of the blade, reduce blade loading, especially fatigue loading.