Balancing weight for wind-power blade

Abstract

The invention belongs to the technical field of wind power generation, and discloses a balancing weight for a wind-power blade. The balancing weight for the wind-power blade are made of prefabricated composite materials; metal with close density or rubber with high density is served as an inner core (1) of the interior of the balance weight; the exterior of the balance weight adopts fiber reinforced resin composite materials, and an outer layer (2) of an external protective layer and a bonding layer is formed by the fiber reinforced resin composite materials in a way of vacuum perfusion forming or a way of hand lay-up forming; the balancing weight formed by the close density metal or high density rubber inner core (1) and the fiber reinforced resin composite material outer layer (2) is of a small-end-up structure; the bottom of the balancing weight is served as a bonding joint face bonded with a blade shell (3). According to the balancing weight for the wind-power blade, the overall density of the balancing weight is increased, the balancing weight is pre-formed outside the blade, and the labor intensity of interior balancing of the blade is reduced.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a counterweight for wind power blades. Background technique [0002] At present, as a clean and environmentally friendly form of new energy utilization, wind power has been increasingly valued and developed by various countries, and the total installed capacity is also gradually increasing. A wind turbine consists of many components, among which the blades play the most important role. A wind wheel composed of blades drives the wind turbine, which ultimately generates electricity. [0003] A wind turbine generally consists of 1, 2, 3 or more wind turbine blades. The rotation of the wind rotor requires that the weight and center of gravity difference between the multiple blades are within a certain design range, which cannot be greater than this requirement, otherwise the rotation of the wind rotor of the fan will be unbalanced, which will seriously af...

AI Technical Summary

Problems solved by technology

[0004] At present, the balance process of wind turbine blades is as follows: First, weigh the blade at two points at the root tip to obtain the weight of the blade, and then calculate the center of gravity, mass and other information based on the length of the blade, and judge whether the information and data are It can meet the requirements of the wind rotor; next, in order to make a qualified wind rotor with multiple blades, it is necessary to balance one or more blades, and the method of balancing is to add A certain weight of the counterweight, so as to achieve the adjustment of the weight and center of gravity between the blades, and form a qualified wind wheel; the counterweight is generally iron, lead, copper and other metals, which can significantly increase the weight; these metals also have The disadvantages are, firstly, the metal is easily corroded in the environment; secondly, the metal cannot be well bonded to the composite shell of the blade

like figure 1 As shown, in order to overcome the above problems, the inner core 1 is usually first bonded to the blade shell 3 with an adhesive 4, and the outer layer 4 made of fiber-reinforced composite material is used to cover the metal weight block to strengthen the connection with the blade shell. Bonding of body 3 (see figure 2 ); however, this process needs to be operated for a long time inside the blade, which has the following disadvantages: first, the weighting process requires on-site composite materials to be strengthened and solidified by hand lay-up, which is complicated and inefficient; second, the internal space of the blade is narrow and the air flow is poor , The bonding time of about 2 hours makes the counterweight operation more difficult, especially in summer and hot climate areas, the operator is more prone to fatigue; in addition, the counterweight metal blocks are mostly square plates, which are not easy to move

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