CN202520487U - Hollow fan blade of wind driven generator - Google Patents

Abstract

The utility model discloses a hollow fan blade of a wind driven generator, which consists of a fan blade mounting flange base, an internal frame and a fan blade envelope, wherein a main beam and a support rod are arranged on the internal frame along the length direction, and a combined support plate cross-linked with the main beam and the support rod is arranged on the internal frame along the width direction; and the fan blade envelope covers the frame to form an integral smooth outer surface. The hollow fan blade has the advantages of high structural strength, high rigidity and light weight, and is suitable for a high-power wind driven generator unit. The flange base, the internal frame and the fan blade envelope are made of high strength magnesium alloy, so the hollow fan blade is good in weather resistance and simple in installation, and the materials can be recycled.

Description

Wind Turbine Hollow Fan Blade

Technical field:

The utility model relates to wind power equipment, in particular to the field of manufacturing fan blades of wind power generators.

Background technique:

The wind turbine blade is a large mechanical component that converts wind energy into torque and transmits it to the generator rotor, and is the basic component of the wind turbine. The cross-section of its working part is shown in Figure 1. Existing fan blades of wind power generators are composed of support frames 2 and 3 and fan surfaces 4 and 5. The supporting frame includes two groove structures at the front and rear, which are arranged in parallel in the length direction and cross section of the fan blades. The trough structure is made of steel or so-called "glass reinforced plastic" (ie glass fiber reinforced resin, such as epoxy resin) composite material. The fan is made of fiberglass. This composite material has the advantages of simple technology, convenient production, low density, high strength, and corrosion resistance. At present, it has been widely used in large and medium-sized wind turbines.

The above-mentioned structure can basically meet the needs of wind turbine blades with a length of 1000-60000mm running at a medium wind speed, but under low wind speed (such as wind speed<3m/s) and high wind speed (such as wind speed> 30m/s) conditions, and Under the condition of high power (5 ~ 10MW) of 60000 ~ 90000mm, this kind of fan blade has been difficult to meet the requirements of long-term stable and safe operation.

The fan blades with the above structure and material have disadvantages such as low component stiffness, low strength, large deformation, poor weather resistance, and easy fracture. Moreover, polymer materials such as epoxy resin and polyester resin as the matrix of this composite material are prone to photooxidative aging, resulting in performance degradation (various mechanical and physical properties decay with time, and finally become brittle and broken), and slowly release low molecular weight. products pollute the air. Cracks tend to appear earlier on the part of the fan blade surface subject to greater stress, causing damage and breakage of the fan blade, resulting in a shorter service life of the FRP fan blade. After breaking, the glass fiber will break into short fibers, which will be lost and float in the air, polluting the environment and endangering the health of people and animals. In addition, such materials are non-renewable, non-processable, and non-recyclable. The raw materials are rapidly depleting fossil fuels (coal and petroleum), and wastes (broken glass fibers, crushed aging resins, etc.) are harmful to the environment. They are required to be buried deep abroad. deal with. At present, most of the FRP wind turbine fan blades on the market are mainly produced by hand lay-up method, and a small amount by molding method. The production process is simple and the quality is unstable, such as uneven glue content (resin content), uneven distribution of glass fibers, etc. , making it difficult to improve product quality. A very small number of small-sized (thousand-watt small-power generators) fan blades are made of aluminum alloy, but in addition to small size, heavy weight is its main disadvantage. A small number of newly developed fan blades use bamboo materials, but they also have problems such as low strength, low rigidity, and short life. Therefore, the wind turbine blades made of the above three materials need to be further reduced in weight and increased in strength and rigidity. In particular, FRP blades and bamboo blades need to be fundamentally improved in terms of life expectancy and environmental compatibility.

Utility model content

In view of the above deficiencies of the prior art, the purpose of this utility model is to design and manufacture a novel hollow fan blade of a wind power generator so as to overcome the above disadvantages of the prior art.

The utility model is realized by following means:

A hollow fan blade of a wind power generator, which is composed of a fan blade mounting flange seat, an inner frame and a fan blade skin. The above-mentioned combined support plate pairs with cross-linked main beams and support rods; the fan skin covers the frame to form a complete and smooth outer surface.

Adopting the structure of the utility model, the fan blade of the wind power generator has the following advantages:

1. High structural strength and high rigidity;

2. It can be used for high-power (1～10MW) wind turbines

3. Light weight, small start-up wind speed and high power generation efficiency;

4. The fan skin has high strength, high cross-section rigidity, and is not easy to deform;

5. Good weather resistance, no photo-oxidative aging, long service life;

6. Simple structure;

7. The raw material magnesium alloy is a green material, which has no pollution to the environment after long-term use and decommissioning;

8. It can be recycled and reused.

Description of drawings:

FIG. 1 is a schematic cross-sectional view of a fiberglass fan blade in the prior art.

Fig. 2 is a partial sectional view of the magnesium alloy fan blade of the present invention.

Fig. 3 is a schematic diagram of the end of the main beam of the utility model.

Fig. 4 is an outline view of a pair of support plates composed of concave and convex support plates of the utility model.

Fig. 5 is a three-dimensional schematic diagram of the assembly of the internal frame of the utility model.

Fig. 6 is a schematic diagram of a support rod of the present invention.

Detailed ways

It can be seen from FIG. 2 to FIG. 6 that the fan blade is composed of a mounting flange seat 100 and a fan blade body 200 . The fan blade body 200 is composed of an inner frame 210 and a fan blade skin 220, a main beam 211 and several support rods (212, 213 in the figure) are arranged in the length direction of the inner frame, The combined support plate pair (216 and 217, 218 and 219 in the figure) where the main beam 211 and the support rod are cross-linked, the flange seat, the main beam, the support plate and the support rod are made of high-strength deformed magnesium alloy. The support plate pair is composed of two support plates, concave (b in FIG. 5 ) and convex (a in FIG. 5 ), and the two support plates of concave and convex are butted up and down on the main beam 211 . The fan skin 220 covers the frame to form a complete and smooth outer surface. The fan skin is made of high-strength magnesium alloy sheet.

It should be pointed out that the flange seat, internal frame and fan blade skin involved in the above structure can be made of the above magnesium alloy, or can be made of light materials such as aluminum alloy that can realize their respective functions, that is, the above structure made of aluminum alloy , are also within the protection scope of this patent.

Claims (2)

1. The hollow fan blade of a wind power generator is characterized in that the fan blade is composed of a mounting flange seat, an internal frame and a blade skin, and a main beam and a support rod are arranged in the length direction of the internal frame, and in the width direction of the internal frame A pair of combined support plates intersecting with the main beam and the support bar is provided; the fan skin is covered on the frame to form a complete and smooth outer surface. 2. The hollow fan blade of a wind power generator according to claim 1, wherein the support plate is composed of two support plates, concave and convex, and the two support plates, concave and convex, are butted up and down installed on the main beam .

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