Secondary injection molding process of megawatt level wind turbine blades

Abstract

The invention provides a secondary injection molding process of megawatt level wind turbine blades. When a white spot region is found after the primary resin injection is completed, a circle of spiral pipe is fast paved on the white spot region, a plurality of glue injection nozzles are uniformly distributed on the spiral pipe, and a layer of outer-layer vacuum bag is covered above the white spotregion through sealing joint strips on the periphery of the spiral pipe. Small holes are dug in the middle of the outer-layer vacuum bag above the center of the white spot region, the glue injection pipe is connected with the spiral pipe while gluing a vacuum air suction pipe, a communication pipe with a middle valve is arranged between the vacuum air suction pipe and the glue injection pipe, theother end of the glue injection pipe is connected with a glue injection barrel through a glue injection valve, the outer end of the vacuum air suction pipe is connected with a vacuum pump through a vacuum valve, vacuum pumping and glue injection are carried out after the system pavement is completed, a injected region is heated, and the manufacture is completed after the fiber structure is cured.The secondary injection resin and the primary injection resin have good combining surfaces, the operation is simple, the fiber intensity in each direction is ensured, and the blade quality and the production efficiency are improved.

Description

technical field [0001] The invention relates to a forming technology of a wind rotor blade, in particular to a secondary pouring molding process of a megawatt-level wind rotor blade. Background technique [0002] At present, the mainstream production process of megawatt-scale wind turbine blades is the vacuum infusion process. The main principle is to build a vacuum system after laying dry fiber cloth, and infuse resin when a certain negative pressure is drawn. In this way, the resin can quickly enter the system under the action of atmospheric pressure to complete the perfusion of the blades. In the design of the infusion process, due to the limitation of the surface quality and feasibility of the product, the number of injection ports and vacuum ports is limited. At the same time, there will be tiny air bubbles entering the vacuum system with the resin during the mixing of the resin. Impurities, to ensure the quality of the perfusion, the positions of the injection port an...

AI Technical Summary

Problems solved by technology

In the design of the infusion process, due to the limitation of the surface quality and feasibility of the product, the number of injection ports and vacuum ports is limited. At the same time, there will be tiny air bubbles entering the vacuum system with the resin during the mixing of the resin. Impurities, to ensure the quality of the perfusion, the positions of the injection port and the suction port need to be carefully calculated and adjusted, but because the system may accidentally leak air or the resistance between the fiber bundles is too large, the perfusion will appear in places that cannot be perfused ( i.e. white spots)

At present, our repair method is if the white spot area is less than 1cm 2 , use a syringe to inhale the resin and inject it into it. This method is simple to operate, but the effect is not good. Due to the high resistance of the fiber bundle, multiple injections will cause a lot of air bubbles to enter the interior of the leukoplakia area, affecting product quality.

If the leukoplakia area is larger than 1cm 2 , it is necessary to cut the white spot area, polish it to the fully perfused part, and then repair it with the same kind of pre-impregnated fiber. This is a complicated operation, and the continuity of the fiber is destroyed, which affects the strength.