Method for preparing large-scale composite-material aerogenerator blade

Abstract

The invention relates to the molding technology of nonmetal composite materials, and provides a method for preparing large-scale composite-material aerogenerator blades; the method mainly relates to the following steps: preparing an upper and a lower housing of the blade; directly laying a crossbeam (3) in the blade housing body when laying the blade housing; completing the preparation of the blade housing by an integral forming process of the crossbeam (3) and the blade housing; during vacuum perfusion, setting different rapid diversion zones and flow obstruction zones (7) according to the change of the permeation rate of a resin in fibers so as to allow the resin to infiltrate the whole laid layer more rapidly and much better; laying a diversion net on the upper surface of the laid blade housing; setting a certain interval between diversion media for the arrangement of the obstruction zones (7), and laying a flow obstruction belt (9) on the diversion media where flow obstruction is needed; or directly laying the flow obstruction belt on the upper surface of the blade housing; adding continuous strand mats into the interior part of the crossbeam layer so as to accelerate the permeation rate of the resin in the layer.

Description

technical field [0001] The invention belongs to the technical field of material forming technology, relates to the forming technology of non-metallic composite materials, and mainly proposes a method for preparing large-scale composite material wind power generator blades. Background technique [0002] The simplification of the production process of large composite material wind turbine blades (referred to as wind power blades) involves the cost of blades and the labor intensity of workers, which is the first thing to be noticed in the production process of blades. At present, most wind turbine blades, especially large blades, still adopt a multi-step molding process (two or more composite material molding processes), that is, the upper and lower shells (blade shells) and main keels of the blades are first prepared respectively. Beams (shear webs) and girders (also called girder caps) are combined into a whole by cementing and hand lay-up. When the beam cap is formed separa...

AI Technical Summary

Problems solved by technology

When the beam cap is formed separately, it can be formed by hand lay-up, extrusion or vacuum infusion. It has strong controllability and is easy to operate. However, the beam mold and process are added, which increases the cost of the blade and consumes more man-hours. The interface bonding strength of other laminates is reduced, which is not conducive to the production efficiency and quality control of wind turbine blades

If the girder prefabricated parts are made by the open hand lay-up method, the pollution index will be high and the labor intensity of the workers will be greater

[0003] The patent "Large Composite Wind Turbine Blades and Its Preparation Method" (Patent Application No. 200510023488.0) proposes one-time integral molding of composite material blades, but this method is quite different from the process currently used by most enterprises and is not easy to implement

A recent domestic patent (Application No.: 200810117093.0, a composite material closed-mold one-time forming process) introduces the composite material blade preparation technology, that is, the blade closed-mold bag press one-time forming process. This process can reduce toxic gas emissions and improve production efficiency. High, the internal and external dimensions of the product are accurate, but the equipment investment is large, requiring the production of airbags, the process is relatively complicated, the fiber orientation control is difficult, and there are still many technical problems to be solved, which is difficult to achieve in the short term

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