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INVENTION
Patent of the Russian Federation RU2186246
METHOD OF MANUFACTURING A QUICK-WIND WIND CROSS
WIND POWER PLANT
The name of the inventor: Zuev NV; Kuznetsov M.V.
The name of the patent holder: Open Joint-Stock Company All-Russian Scientific Research Institute of Hydraulic Engineering named after BE Vedeneev
Address for correspondence: 195220, St. Petersburg, Gzhatskaya st., 21, JSC VNIIG im.B.E.Vedeneeva, Patent unit
Date of commencement of the patent: 2000.07.24
The invention relates to the field of wind energy and can be used in the design and manufacture of wind power plants (VEU) with an electric generator. The technical result consists in simplifying the technology of manufacturing a high-speed wind wheel containing a hub on the generator shaft and blade, reducing the material consumption and the cost of the wind wheel, is provided by the fact that the blades of the high-speed wind wheel are cut from a thin sheet material, for example, an aluminum alloy, with a decreasing chord from the base to Vertex of the blade and, respectively, with a decreasing angle of the chord twisting relative to the plane of rotation of the wind wheel, using blanks in the form of segments of a cylinder with a straight edge approximately equal to the length of the blade and a chord equal to the blade at the base. In this case, the leading edge of each blade is cut out along a curved generatrix, and the trailing edge is aligned with the straight edge of the workpiece. The radius of the workpiece, the curvilinear generatrix and the initial angle of twisting of the chord at the base of the blade when fastened to the hub is set from the condition of high aerodynamic quality at each section of the blade along the radius of the wind wheel.
DESCRIPTION OF THE INVENTION
(EN) The invention relates to wind power engineering, namely, to the design and manufacture of wind power plants (VEU) with an electric generator, intended for charging accumulator batteries and powering electric lighting devices, radio and television receivers, electric pumps, etc. in areas and facilities without power supply.
In the field of wind power, a wind turbine with a horizontal axis of rotation of the wind wheel (VC) 1 is widely used (see Fig. 1), which is mounted on the shaft of the electric generator 2. The VC consists of a hub 3 and blades 4.
Various designs and methods for manufacturing VCs are known. For a wind turbine with an electric generator, a high-speed VC with twisted blades with a volumetric aerodynamic profile is used (D. de Renzo, Wind Power .-- M .: Energoatomizdat, 1982, p.129-134).
The disadvantage of these analogs is the high material intensity of the blades, the complexity of the manufacturing technology, the use of special synthetic materials (fiberglass) and technological adaptations, which increases the cost of VC.
The closest to the claimed invention in terms of a set of essential features is the method we used for the prototype of manufacturing VC VEU with blades in the form of a thin-walled shell of light aluminum alloy with the filling of the internal cavity of the shell with foaming material by filling the dosed quantity of the foaming powder with subsequent heating, Filling the cavity and warming up to the foaming temperature is carried out in a special device (RF patent No. 2139441, F 03 D 3/06, published 1999).
The disadvantage of the prototype is the relatively high material consumption of the blades and the complexity of the technology of their manufacture, including the use of special devices, and a number of technological operations, including shelling, filling the shell cavity with a special composition, heating, and welding the blade sheath along the trailing edge. As a result, the cost of the VC is substantially increased.
The technical task of the proposed invention is to simplify the technology of VC manufacture while reducing its material intensity and cost.
The essence of the claimed invention is expressed in the following set of essential features sufficient to achieve the above technical result, which is achieved by the fact that in the proposed method for manufacturing a high-speed DC wind turbine with an electric generator comprising a hub on the generator shaft and a blade that is cut from a thin sheet material with a decreasing Chord from the base to the top of the blade and, respectively, with a decreasing angle of twist of the chord with respect to the plane of rotation of the VC. To do this, the workpieces are used in the form of segments of a cylinder with a straight edge approximately equal to the length of the blade. Moreover, the leading edge of each blade is cut out along a curvilinear generatrix, and the trailing edge is combined with the rectilinear edge of the workpiece.
In addition, the proposed method has optional features that characterize its particular cases, namely
- the radius of the workpiece, the curvilinear generatrix and the initial angle of twisting of the chord at the base of the blade when fixed to the hub is set from the condition of high aerodynamic quality at each section of the blade along the VC radius;
- Aluminum alloy is used as a sheet material.
In the theoretical aerodynamics of a high-speed VC, the aerodynamic quality is defined as the ratio of the aerodynamic coefficients of the lift force and the drag force. Providing a high value of aerodynamic quality at all sections of the blade along the radius of the VC is a condition for obtaining a high wind energy utilization factor (aerodynamic efficiency).
The claimed method is new, because Is characterized by the presence of a new set of features that are absent in all the methods of manufacturing the VK VEU with an electric generator known to us, containing a hub on the generator shaft and a blade.
The immediate technical result that can be obtained by implementing the claimed set of features is that
1. The material consumption is reduced and the technology for manufacturing high-speed VC blades is simplified.
2. The cost of VC is reduced.
Obtaining the mentioned technical result provides for the appearance of new useful properties in the claimed method of manufacturing a high-speed VC, namely, simplification of the technology for manufacturing VK VEU with an electric generator and reducing the material consumption and the cost of VC.
This allows us to recognize the claimed technical solution with the appropriate criterion "inventive step".
The claimed method is explained in the drawings: FIG. 1 shows a high-speed VC with a generator; FIG. 2 shows a VK blade blank, where V is the VK, 2 is the generator, 3 is the VK hub, 4 is the VK blade, 5 is the leading edge of the blade, - the trailing edge of the blade.
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The VK 1 is mounted directly on the shaft of the electric generator 2. The VK 1 comprises a hub 3 and fixed blades 4 of thin sheet material with a decreasing chord from a larger b 1 (FIG. 1, B and FIG. 2b) at the blade base to a smaller B 4 at the tip of the blade and, respectively, with a decreasing angle of twist of the chord with respect to the plane of rotation of VC from The proposed method is carried out as follows. In the manufacture of high-speed VC, for example, flared, rectangular blades are used in the form of segments of a cylinder with a radius r of a roll. (Fig. 2b), while the length of the rectilinear edge of the workpiece is approximately equal to the length of the blade, and the chord of the workpiece is equal to the chord of the blade base. To obtain a twist of the chord of the blade, the front (curvilinear) edge 5 of the latter is cut out along the curvilinear generatrix, and the back (rectilinear) edge 6 is aligned with the rectilinear edge of the workpiece (Fig. 2a), resulting in a twist angle of the chord along the length of the VC blade from the base to the vertex Varies: To ensure a high value of the wind energy utilization factor, the radius of the workpiece r is the roll. (Heading) , a curvilinear generator and the initial angle of the chord twist The proposed method allows simple and cheap technological methods to produce an efficient high-speed VC with a blade of thin sheet material, for example an aluminum alloy, with a coefficient of using wind energy (efficiency) 0.4-0.45 for a small with an electric generator of a wind turbine. |
1 (Fig. 1, c) at the base of the blade up to 
CLAIM
1. A method of manufacturing a high-speed wind turbine of a wind power plant with an electric generator, comprising a hub on the generator shaft and a blade, characterized in that the blades are cut from a thin sheet material with a decreasing chord from the base to the top of the blade and accordingly with a decreasing angle of twist of the chord with respect to the plane of rotation And the blanks are used in the form of segments of a cylinder with a straight edge approximately equal to the length of the blade, the leading edge of each blade being cut out along a curved generatrix and the trailing edge being aligned with the rectilinear edge of the blank.
2. A method according to claim 1, characterized in that the radius of the workpiece, the curvilinear generatrix and the initial angle of twisting of the chord at the base of the blade when fixed to the hub is set from the condition of high aerodynamic quality at each section of the blade along the radius of the wind wheel.
3. The method of claim 1. 1 and 2, characterized in that an aluminum alloy is used as a sheet material.
print version
Date of publication 02.02.2007gg
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