Cavity structure of middle box body of wind power generating set, method for preparing middle box body using the structure

Abstract

The invention provides a cavity structure of a middle box of a wind turbine generator system and a method for preparing the middle box through the cavity structure. The structure comprises a gating system, a middle box cavity and a gas outlet, wherein the gating system comprises a downsprue and a transitional sprue which communicate with each other in sequence; the downsprue is used for introducing casting molten iron into the gating system; the transitional sprue is used for introducing the casting molten iron into the middle box cavity; an inner gate is arranged on the transitional sprue and communicates with the middle box cavity. The cavity structure can overcome casting defects of severe turbulence, rolling-in, gas absorption, excessive oxidation of metals and the like, and has the advantages of being wide in temperature resistance range and high in strength and meeting the requirements of EN12680.3 and DINEN1369 standards.

Description

technical field [0001] The invention belongs to the technical field of casting a middle box of a wind power generating set, and in particular relates to a cavity structure of a middle box of a wind power generating set and a method for preparing the middle box by using the structure. Background technique [0002] Wind energy is a clean and renewable energy source, which is widely valued by countries all over the world. Ductile iron castings such as the front box, the rear box, the middle box, and the planetary carrier, as the key components of the wind turbine gearbox, operate at altitudes of tens of meters to more than 100 meters all year round. °C or even -40 °C environment for 20 years of service, the comprehensive performance index requirements are relatively high. The reliability of the gearbox has a major impact on the safety of wind turbines, and the cost of failure recovery is also extremely expensive. It is understood that a 1.5MW unit designed to generate 2,200 ho...

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Problems solved by technology

The reliability of the gearbox has a major impact on the safety of wind turbines, and the cost of failure recovery is also extremely expensive. It is understood that a 1.5MW unit designed to generate 2,200 hours of annual power generation, a major failure of the gearbox, only the equipment cost of the gearbox is less than 1 million If the hoisting fee, transportation fee, and labor cost are added, it is estimated to be about 200,000 yuan, and the total restoration cost will be about 1.3 million yuan

[0003] In particular, the middle box plays a key connection role, and the existence of casting defects will seriously affect the use effect

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