Making wind generator rotor hub, employs molding core assembly and vacuum-assisted resin transfer molding process

摘要

A molding core is constructed. This comprises a main core section (10) representing the shaft, intermediate core components (14) and a hub flange core (12) for each rotor blade. A hub preform is made by applying fiber layers (unimpregnated) onto the core assembly. A vacuum film is applied over the hub preform and is sealed-off against the core assembly. A molding core is constructed. This comprises a main core section (10) representing the shaft, intermediate core components (14) and a hub flange core (12) for each rotor blade. A hub preform is made by applying fiber layers (unimpregnated) onto the core assembly. A vacuum film is applied over the hub preform and is sealed-off against the core assembly. Vacuum is applied to the interspace and fiber layers. Resin is introduced into the hub preform through an injection connection. The resin is hardened-off whilst rotating the preform and core assembly which it encloses, about the shaft axis. The core components and the vacuum film are removed from the hub preform. The shaft core has vacuum connections and a surrounding vacuum channel at each end. Plates are applied to the hub flange core components; these include connections for resin injection. The plates are equipped to position fastening inserts in the molding. These form the connections for the rotor blade flanges. The injection connections are annular lines in the plate. Their diameter is less than or greater than the diameter of the ring of inserts. The section of the preform which forms the shaft has at least one additional injection ring.