Fan motor blade made of different aluminium casting alloys

Abstract

The invention discloses a fan motor blade made of different aluminium casting alloys, belonging to the field of wind power generation equipment parts. The operational performance of a long blade cast from a single aluminium alloy material can be influenced. The invention has the characteristics that the blade is divided into at least two parts which are made of different aluminium casting alloys, every adjacent two parts form a fusion area which constitutes the aluminium casting alloys of the two parts, so that different parts of the blade have different properties and can satisfy the needs for the operation of the long blade.

Description

technical field [0001] The invention belongs to the field of wind power generation equipment components, and in particular relates to a wind motor blade made of different cast aluminum alloys. Background technique [0002] Blades are the most basic and critical components of wind power generators. At present, wind power generation in the world is further developing in the direction of high-power and long blades. The length of a single blade has reached more than 60 meters. The harsh environment and long-term non-stop operation of the blades put forward strict technical performance and quality requirements for the blades: the specific gravity is light and has the best fatigue strength and mechanical properties, and it can withstand extreme harsh conditions such as storms and the test of random loads ;The elasticity of the blade, the inertia during rotation and the characteristic curve of its vibration frequency are all normal, and the load stability transmitted to the entire ...

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Problems solved by technology

[0003] In order to meet the above requirements, the manufacturing materials of blades have developed from wooden blades and cloth-skinned blades to the current large-scale wind turbine blades, which generally use glass fiber reinforced polyester resin blades, glass fiber reinforced epoxy resin blades and carbon fiber reinforced epoxy resin blades. blades, but the blades made of these materials are heavy in weight and poor in electrical conductivity, resulting in poor lightning protection performance. The development of ultra-large wind turbine blades is still limited, and carbon fiber reinforced epoxy resin blades are expensive. FRP epoxy resin, Carbon fiber and other materials are highly polluting in the raw material manufacturing process, and the source of raw materials is not renewable

In order to solve these problems, the inventor proposes that the blades are manufactured by casting aluminum alloys. Cast aluminum alloys are mainly divided into aluminum-magnesium alloys, aluminum-copper alloys, aluminum-silicon alloys and aluminum-zinc alloys. The performance characteristics of the alloy are different, and the operation characteristics of each part of the blade from the blade root to the blade tip are different, resulting in different stresses, expansions, etc. of each part. If a single cast aluminum alloy material is used, it will affect the operation performance of the blade for long blades

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