Fracture-resistant connecting structure of wind wheel blade and variable-pitch bearing

Abstract

The invention discloses an anti-fracture type connecting structure of a wind wheel blade and a variable pitch bearing, which comprises a blade and the variable pitch bearing, the root of the blade is connected with the inner ring of the variable pitch bearing through a fixing piece, and the anti-fracture type connecting structure is characterized in that at least two circles of fixing hole groups are arranged on the root of the blade along the radial direction, and embedded positioning sleeves are arranged in the fixing holes; via holes corresponding to the fixing hole sets are formed in the variable pitch bearing inner ring, and the fixing pieces penetrate through the via holes and are connected with the embedded positioning sleeves. The blade and the variable pitch bearing are provided with the multiple circles of fixing hole sets in a grouping mode to form a grid type connecting structure, the number of bolts and the mass of a single bolt do not need to be increased, the stress concentration phenomenon is effectively reduced only through structural optimization, and the fracture resistance is improved.

Description

technical field [0001] The invention relates to the technical field of wind turbine assembly, in particular to a fracture-resistant connection structure between a wind rotor blade and a pitch bearing. Background technique [0002] In recent years, with the rapid development of the wind power industry, wind turbines have an increasing demand for high-performance, long-sized blades, and the blades have begun to develop into large-scale. [0003] As the size and weight of the blade continue to increase, the load on the blade is also increasing, making the connection strength between the root of the blade and the pitch bearing become a bottleneck in the development of the blade. Although the design size of the blade has been greatly improved in recent years, the design of the root connection structure of the blade still retains the traditional single-row bolt connection design idea, that is, a circle of bolt sleeves is pre-embedded at the root of the blade, and the double-headed...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem of stress concentration between the existing fan blades and the pitch bearing mentioned in the background technology, which leads to fatigue fracture, the present invention provides a fracture-resistant connection structure between the wind turbine blade and the pitch bearing. Blades and pitch bearings are grouped with multi-turn fixed hole groups to form a "grid" connection structure, without increasing the number of bolts and the quality of a single bolt, and only through structural optimization can effectively reduce stress concentration and improve fracture resistance

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