Leading edge protecting layer technology for fan blades

Abstract

The invention discloses a leading edge protecting layer technology for blades of a wind driven generator. The leading edge protecting layer is used for protecting leading edges of the blades of the wind driven generator from being eroded by rainwater. Protecting layers of the leading edge protecting layer technology mainly comprise three layers, namely an adhesive layer, a protective film layer and an oil paint layer which are upward arranged from a conventional coating on the surface of each blade; the lower surface of the adhesive layer is attached to the conventional coating on the surfaceof each fan blade so as to realize the effects of bonding the protective film layer with the blade; the film protecting layer is made of colorless transparent high-elasticity plastic which can be butnot limited to thermoplastic elastomer polyurethane (TPU). The oil paint layer is an epoxy resin or polyurethane / polyurea elastomer coating. According to the leading edge protecting layer technology disclosed by the invention, the rain erosion resistance of the fan blades is greatly improved, and the times of high-altitude maintenance at later stage are reduced.

Description

technical field [0001] The invention belongs to the field of polymer materials and relates to a protective layer technology for the leading edge of a wind generator blade. Background technique [0002] The blades of large wind turbines are made of glass fiber reinforced epoxy resin, carbon fiber and other materials, which have high strength. However, because the linear velocity of the tip of the blade is very high, which can reach more than 300 kilometers per hour, the leading edge of the tip of the fan blade, that is, the windward side, will collide head-on with rainwater, sand and dust, causing serious erosion, resulting in damage to the aerodynamic shape of the blade. resulting in a substantial reduction in power generation efficiency. [0003] In order to prolong the life of the blade and enhance the ability of the blade to resist rain erosion, there are currently two protective technologies: one is the blade protective film solution represented by 3M, and a protective ...

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Problems solved by technology

[0004] However, once the protective layer of the blades of large wind turbines is damaged, it needs to be repaired at high altitude in time. When using the protective film solution, it is difficult to remove the protective film because of its high viscosity, and it is not convenient to re-attach the film in the air, so the protective film solution is not widely used.

Although the paint coating has a short service life, it is relatively easy to repair paint at high altitudes, and it is currently the mainstream technology.

However, because the degree of paint damage cannot be judged in time, once the putty under the paint is also eroded by rain, it will be more troublesome to repair it

Moreover, high-altitude operations have the disadvantages of high risk, difficulty, poor construction effect compared to the ground, and high cost. Therefore, it is important for wind turbine manufacturers to find better ways to protect the leading edge of blades and reduce the number of high-altitude operations within the life cycle of blades. research direction

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