TWM623652U - Blade structure of vertical axis wind turbine - Google Patents

Abstract

A fan blade structure of a vertical axis wind turbine includes a blade body made of composite material and defining a spirally extending inner space, and at least one reinforcing beam made of composite material and integrally formed with the blade body . The blade body has two inner surfaces located in the inner space and facing each other. The at least one reinforcing beam is located in the inner space, and includes two connecting portions integrally connecting the inner surfaces respectively, and a supporting portion connecting the connecting portions. The blade body is integrally formed without joints, which can avoid cracking or damage from joints after long-term use. The at least one reinforcing beam can increase the supporting force to strengthen the structural strength of the blade body, improve the problem of insufficient structural strength of the traditional fan blade, and obtain higher rigidity, which can effectively withstand strong airflow and harsh environments in the wind field. .

Description

Blade structure of vertical axis wind turbine

The new model relates to a component of a wind power generator, in particular to a fan blade structure of a vertical wind power generator.

Referring to FIG. 1 , the vertical axis wind generator 1 is one of the wind generators, and is characterized in that its rotating shaft 11 is perpendicular to the direction of the wind, and the fan blades 12 are arranged at intervals around the rotating shaft. The advantage of the vertical axis wind turbine 1 is that it does not need to be aligned with the wind direction to operate, so many complicated mechanical adjustment devices can be eliminated to align the fan blades with the wind direction, and in environments with large changes in wind direction or wind speed such as turbulence or gust It can have stable and reliable power generation efficiency. However, each blade 12 of the vertical axis wind turbine 1 is usually formed by welding or bonding two shells, and the interior is hollow to reduce weight and materials. In the long-term use of this kind of fan blade structure, the joints at the joint are often cracked or damaged, and the hollow fan blade also has the problem of insufficient strength. Therefore, the fan blade structure of the traditional vertical axis wind turbine 1 still has room for improvement. .

Therefore, the purpose of the present invention is to provide a fan blade structure of a vertical axis wind power generator which is integrally formed and has good structural strength.

Therefore, the fan blade structure of the novel vertical axis wind power generator includes a blade body made of composite material and defining a spirally extending inner space, and at least one blade body made of composite material and integrally formed with the blade body of reinforcement beams. The blade body has two inner surfaces located in the inner space and facing each other. The at least one reinforcing beam is located in the inner space, and includes two connecting portions integrally connecting the inner surfaces respectively, and a supporting portion connecting the connecting portions.

The effect of the new model is that the main body of the blade is integrally formed without joints, which can avoid the gradual cracking or damage from the joints under long-term use, and can reduce the need for molds and post-processing procedures to achieve the effect of reducing costs. The at least one reinforcing beam can increase the supporting force to strengthen the structural strength of the blade body, improve the problem of insufficient structural strength of the traditional fan blade, and have higher rigidity.

Referring to FIGS. 2, 3, and 4, an embodiment of the fan blade structure 2 of the novel vertical axis wind power generator, this embodiment is usually applied to a vertical axis wind power generator, and the vertical axis wind power generator includes A rotating shaft 3 connected to other motor elements, a plurality of fan blade structures 2 arranged annularly spaced around the rotating shaft 3 , and a plurality of connecting pieces 4 connecting the fan blade structures 2 and the rotating shaft 3 .

Referring to FIG. 3 , FIG. 4 , and FIG. 5 , the fan blade structure 2 includes a blade body 21 and a reinforcing beam 22 disposed in the blade body 21 . The blade body 21 and the reinforcing beam 22 are integrally formed of composite materials. In this embodiment, the blade body 21 and the reinforcing beam 22 are polymer composite materials, which may be epoxy resin as the base material, carbon fiber Or fiber glass is made of carbon fiber reinforced polymer (Carbon Fiber Reinforced Polymer, CFRP), but not limited to this. The blade body 21 is twisted and extended (please refer to FIG. 2 ), and defines an inner space 211 spirally extending in the same direction as the twist direction of the blade body 21 . The blade body 21 has two inner surfaces 212 located in the inner space 211 and facing each other. Depending on the shape of the blade body 21, the inner surfaces 212 may be spaced apart from each other without contacting each other, or may be located on both sides (or one side) are connected. The reinforcing beam 22 is located in the inner space 211 and has an H-shaped cross-section. The reinforcing beam 22 includes two connecting portions 221 integrally connected to the inner surfaces 212 , and a supporting portion 222 connecting the connecting portions 221 . The integrated design of the blade body 21 and the reinforcing beam 22 can prevent the conventional blade from rapidly spreading due to the cracking of the joints at the joint. The blade body 21 is made of composite material, and with the hollow design The fan blade structure 2 is kept lightweight, and the rigidity against bending and shearing is increased through the reinforcing beam 22 to enhance the overall structural strength. Referring to FIG. 6 , the present embodiment may also include a plurality of reinforcing beams 22 as shown in FIG. 6 . The reinforcing beams 22 are arranged at intervals along the extending direction of the inner surfaces 212 , which can provide a higher-strength supporting force and provide another An implementation aspect is available for selection.

Referring to FIG. 7 to FIG. 10 , the manufacturing method of this embodiment is described below, including a stacking step 41 , a placing step 42 , and a forming step 43 . In the lamination step 41, a plurality of silicone rubber core molds are prepared first, and then a plurality of sheets of carbon fiber prepregs (or unidirectional fibers) impregnated with resin are attached to the silicone rubber core molds, and then other carbon fibers are pre-impregnated The cloth layers are stacked to the required thickness and strength, thereby forming a plurality of carbon fiber prepreg material stacks 5, and the carbon fiber prepreg material stacks 5 are interdigitated to have better force transmission characteristics. The stacking structure of the carbon fiber prepreg material stacks 5 is described here. Most of the carbon fiber prepreg material stacks 5 surround the inner space 211 at the outer ring, and a small portion of the carbon fiber prepreg material stacks 5 are placed across the inner space 211 . At the center of the inner space 211, the inner space 211 is divided into two regions 213, and the silicone rubber core molds are located in these regions 213 respectively. After achieving sufficient strength and thickness, the silicone rubber core molds are Extraction from the carbon fiber prepreg stacks 5 leaves the areas 213 free. In the placing step 42 , two uninflated air bags 7 are respectively penetrated into the regions 213 , and the carbon fiber prepreg material stacks 5 together with the air bags 7 are placed in the cavity of a mold 6 In the middle (the mold 6 is not yet closed at this time, and the aforementioned components are placed in one of the upper mold or the lower mold), the air bags 7 are respectively connected to the blowing nozzles passing through the mold 6 . The air bags 7 are made of nylon, silicone rubber or other materials that can withstand high temperatures above 130 degrees Celsius. In the molding step 43, the mold 6 is closed and sent to a hot press for heating at 130°C to 150°C for about 30 minutes, while air is poured into the air bags 7 through a The air bag 7 swells outward to squeeze the carbon fiber prepreg material stack 5 (the pressure of the air bag 7 is about 1~10kg/cm ² , preferably 7 kg/cm ² ), and the carbon fiber prepreg material stack The layer 5 will be hot-pressed under the extrusion and high temperature of the air pockets 7 , and after the molding is completed, the fan blade structure 2 shown in FIG. 10 can be produced.

Referring to FIG. 8 , FIG. 10 , and FIG. 11 , when the fan blade structure 2 with a plurality of reinforcing beams 22 is to be manufactured, a plurality of silicone rubber core molds can be placed at intervals in the lamination step 41 to form the inner space 211 Two or more regions 213 are separated, and in the placing step 42, a plurality of air bags 7 are respectively placed in the regions 213, so that a fan blade structure with a plurality of reinforcing beams 22 is formed in the molding step 43 2. In the placing step 42 , only one bent air bag 7 may be used as shown in FIG. 11 , and the air bag 7 may be bent into two sections as shown in FIG. 11 and penetrate into the two sections respectively. In the area 213 , the aforementioned process can be completed with one air bag 7 . Of course, the extension length of the support portion 222 of the reinforcing beam 22 of the fan blade structure 2 made of the aforementioned air bag 7 is slightly shorter.

To sum up, the present invention can maintain the overall light weight while maintaining sufficient structural strength, so as to obtain higher rigidity, and effectively withstand strong airflow and harsh environments in the wind field, and the blade body 21 and the The integrated design of the reinforcing beam 22 can not only avoid the cracking from the joint at the joint, but also enable the reinforcing beam 22 to cooperate with the shape of the blade body 21 to twist and extend to avoid assembly difficulties caused by the combined design. Reduce the number of molds, and reduce the post-processing process, to achieve the effect of reducing labor and cost, so it can indeed achieve the purpose of this new model.

However, the above are only examples of the present invention, which should not limit the scope of the present invention. Any simple equivalent changes and modifications made according to the scope of the patent application for this new model and the contents of the patent specification are still within the scope of the present invention. within the scope of this new patent.

2: Fan blade structure 21: Blade body 211: Interior Space 212: inner surface 213: Area 22: Reinforcing beam 221: Connector 222: Support part 3: Spindle 4: Connectors 41: Lamination step 42: Placement steps 43: Molding step 5: Carbon fiber prepreg material stack 6: Mold 7: Air bag

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: 1 is a perspective view illustrating a conventional vertical axis wind turbine; Fig. 2 is a perspective view illustrating the vertical axis wind turbine to which the novel fan blade structure is applied; Fig. 3 is a bottom view illustrating the bottom view of the vertical axis wind turbine; Fig. 4 is a perspective view of a partial section, illustrating an embodiment of the novel fan blade structure; 5 is a cross-sectional view illustrating a top-view cross-sectional aspect of this embodiment; 6 is a perspective view, partially cut away, illustrating another aspect of the embodiment; FIG. 7 is a flow chart illustrating the manufacturing method of this embodiment; 8 to 10 are schematic diagrams to assist in explaining the flow of the manufacturing method described in FIG. 7; and FIG. 11 is a schematic diagram illustrating an arrangement in which only a single air bag is used in the manufacturing method described in FIG. 7 .

2: Fan blade structure

21: Blade body

211: Interior Space

212: inner surface

22: Reinforcing beam

221: Connector

222: Support part

Claims (3)

A fan blade structure of a vertical axis wind turbine, comprising: a blade body made of composite material and defining a helically extending interior space therearound, the blade body having two interior surfaces located in the interior space and facing each other; and At least one reinforcing beam is made of composite material and integrally formed with the blade body, the at least one reinforcing beam is located in the inner space, and includes two connecting portions integrally connected to the inner surfaces respectively, and a connecting portion connecting the connecting portions the support part. The fan blade structure of the vertical axis wind turbine as claimed in claim 1 includes a plurality of reinforcing beams, and the reinforcing beams are arranged at intervals along the extending direction of the inner surfaces. The fan blade structure of a vertical axis wind turbine according to claim 1, wherein the blade body and the at least one reinforcing beam are made of carbon fiber reinforced polymer.

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