System for connecting wind generator blade sections

Abstract

The invention relates to a system for connecting wind generator blade sections, preferably for the application in the connection of blade sections (1, 2), the formation of which comprises skins (3) determining the outer aerodynamic profile, arranged on inner stringers (4) like longitudinal partitions, the connection between the sections (1, 2) being established by means of rods (12) which are included through holes (8) defined in a longitudinal direction on the inside of the skins (3) and of the stringers (4) in the sections (1, 2), with the threaded connection of said rods (12) at one end on respective elements (11) which are fitted in one of the sections (1) and the tension is tightened by means of corresponding nuts (14) which are incorporated on the other end of said rods in the other section (2).

Description

FIELD OF THE ART [0001]The present invention relates to the wind generator blades which are formed by composition by means of two or more longitudinal sections, for the purpose of facilitating the construction and essentially road transport, proposing a system for connecting sections in the constructive formation of the blades, whereby advantageous features for said function are achieved.STATE OF THE ART [0002]The worldwide demand for renewable energy in order to deal with climate change and maintain an expectation of power production without depending on non-renewable natural resources involves in a very relevant manner wind energy, which is mostly developed by means of wind generators which are driven by a blade rotor capturing the wind.[0003]The development of wind generators and their application to power production by means of using the wind requires, however, wind generators with increasingly greater rated power which are more efficient and have a lower cost per kilowatt of th...

AI Technical Summary

Benefits of technology

[0010]According to the invention, a system for the connection between the sections making up wind generator blades is proposed, with features which make the performance of the assembly and the effectiveness of the connection advantageous.

[0014]A securing for the connection between the blade sections is thus obtained which allows determining a resistant fastening with complete precision by means of tightening the nuts which are arranged on the rods of the connection, the assembly being very easy to carry out, since the securing rods are incorporated before the coupling in one of the sections to be connected, such that it is then only necessary to couple by insertion the second section and tighten the tension nuts for the securing on the second end of the securing rods.

[0015]The incorporation of the intermediate ring in the connection further determines a protection preventing the defibration of the layers of fiber in the connection edge of the outer skins of the blade sections, which prevents, in the application work of the formed blade, the force of the wind from being able to cause a progressive deterioration of defibration of the skins forming the aerodynamic profile.

[0016]In addition, making the hollows for housing the outer coupling elements of the securing rods of the connecting, at the inner part of the walls of the sections and without passing to the outside, means that said walls of the sections which are connected are not very weakened, and furthermore the outer surface remains continuous, such that the efficiency of the aerodynamic profile for the performance of the blade is not affected.

Problems solved by technology

Exceeding a measurement of the size of the blades of the wind generators entails, however, a series of collateral problems because of the difficulties that arise both in the transport aspect, due to the existing vehicles and highway traffic regulations, and in the aspect of the actual constructive assembly of the wind generator, due to the types of cranes which must be used.

Indeed, from 35 meters in length onwards, wind generator blades have large transport difficulties, since they require special transport means, which are very expensive.

In this sense, several systems have been developed for connecting the sections making up wind generator blades, which are formed by the connection of longitudinal sections, such as for example the solution of Patent ES 9901177 but the solutions known in such sense generally have deficiencies relating to the difficulty of the assembly and to the efficiency of the securing determining the connection between the sections.

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