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Draught fan wind wheel adjusting device and draught fan set comprising draught fan wind wheel adjusting device

A technology for adjusting the device and the fan, which is applied to the wind turbine, the control of the wind turbine, the wind turbine and other directions that are consistent with the wind direction, and can solve the problem that the resistance coefficient of the wind turbine blade of the wind turbine increases and affects the power coefficient of the wind turbine. , The problem of insufficient application of large-diameter wind rotors is achieved, and the effect of eliminating structural characteristics, reliable wind catching performance, and reducing drag coefficient is achieved.

Inactive Publication Date: 2015-05-06
东方电气风电股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the simple adjustment device used to increase the diameter of the wind rotor is only a hollow column / cone structure, and its structure and shape do not fully consider the characteristics of air flow, which increases the drag coefficient of the cylindrical section of the blade of the wind rotor (We know that the wind-capturing performance of the wind rotor is not only directly proportional to the diameter of the rotor, but also closely related to the lift and drag characteristics of any micro-segment (that is, the blade element) of the rotor blade upward), so that the large The wind power captured by large-diameter wind rotors is relatively limited, and the full application of large-diameter wind rotors has not been achieved
In addition, also based on this column / cone structure, the flowing air easily generates turbulence when it flows through the cylindrical section of the wind rotor, which further increases the drag coefficient of the rotor blades of the wind turbine. The length of the cylindrical section of the wind rotor blade is directly proportional, which seriously affects the power generation power coefficient of the wind turbine; what's more, the turbulent flow of the cylindrical section of the wind rotor blade easily causes the vibration of the wind turbine (this is especially true for the cylindrical section of the wind rotor blade. It is more obvious if the length of the section is too long), this kind of vibration will not only reduce the power generation of the wind turbine, but also bring safety hazards to the wind turbine

Method used

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  • Draught fan wind wheel adjusting device and draught fan set comprising draught fan wind wheel adjusting device
  • Draught fan wind wheel adjusting device and draught fan set comprising draught fan wind wheel adjusting device
  • Draught fan wind wheel adjusting device and draught fan set comprising draught fan wind wheel adjusting device

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Effect test

Embodiment 1

[0032] see figure 1 , figure 2 and image 3 : the wind wheel adjustment device 3 of the present invention is a hollow structure with an airfoil, which is in the shape of a blade segment. It is casted with non-metallic materials (of course, it can also be metal materials according to the requirements of use), and its two ends have inwardly folded flanges. The angle between the axis of the blade on the original hub and the vertical line of the axis of the main shaft of the fan) is defined as coaxial (that is, the angle between the axes of the flanges at both ends is 0) or inclined (that is, the axes of the flanges at both ends are at a certain angle) The included angle, usually the value of this included angle is in the range of 0-2° and cannot be 0, for example, 0.5°, 1°, 1.5° or 2°, etc.), to ensure the final size of the wind rotor (that is, sweep area) increases, the clearance distance between the tip of the blade and the tower is within a safe range. It is required that...

Embodiment 2

[0038] see Figure 4 , Figure 5 and Figure 6 : the wind wheel adjustment device 3 of the present invention is a hollow structure with an airfoil, which is in the shape of a blade segment. It is formed by casting non-metallic materials (of course, it can also be metal materials according to the requirements of use), and of course it can also be formed by split welding combination. The two ends of the adjustment device 3 have flanges folded inward respectively, and the flanges at both ends depend on the cone angle of the wind turbine of the wind turbine originally put into operation (that is, the angle between the axis of the blade on the original hub and the perpendicular to the axis of the main shaft of the fan), Coaxial (that is, the angle between the axes of the flanges at both ends is 0) or inclined (that is, different axes, the axes of the flanges at both ends form a certain angle, usually the value of this angle is in the range of 0 to 2° and When it cannot be 0, for...

Embodiment 3

[0045] see Figure 7 , the other structure of this embodiment is the same as that of Embodiment 2, the difference is that the positions of the pitch bearing 2 and the adjustment device 3 are adjusted relative to the hub 1, that is, the adjustment device 3 is directly connected to the hub 1 through several bolts Above, the outer ring of the pitch bearing 2 is connected to the adjustment device 3 by several bolts, and the blade 5 is connected to the inner ring of the pitch bearing 2 by several bolts. This connection structure makes the adjusting device 3 formed with one end corresponding to the flange of the hub 1 of the wind power generating set, and the other end corresponding to the flange of the pitch bearing 2 of the wind generating set. This assembly structure not only has the advantages of Embodiment 2, but also effectively reduces the load on the pitch bearing 2, which is conducive to reducing the strength requirements for the pitch bearing 2, improves the operating cond...

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Abstract

The invention discloses a draught fan wind wheel adjusting device and a draught fan set comprising the draught fan wind wheel adjusting device. The adjusting device is of a blade section structure, one end of the adjusting device is connected with a draught fan hub / variable-pitch bearing, the other end of the adjusting device is connected with the draught fan variable-pitch bearing / a blade root, and a pneumatic airfoil is arranged on a blade section adjusting device. According to the draught fan set, the blade section adjusting device is connected between the hub and the variable-pitch bearing, the variable-pitch bearing is connected with the blade or the blade section adjusting device is connected between the variable-pitch bearing and the blade root, and the variable-pitch bearing is connected with the hub. The blade section adjusting device is provided with the pneumatic airfoil, and after the adjusting device is assembled and formed on a wind wheel, the pneumatic airfoil of the adjusting device and a pneumatic airfoil on the blade correspond to the same position of the blade. According to the draught fan wind wheel adjusting device, the windward area of the wind wheel can be effectively enlarged, meanwhile, the resistance coefficient of a length adjusting section on the wind wheel blade is greatly reduced, the wind catching performance of the wind wheel is effectively and reliably improved, and the advantages of the large-diameter wind wheel can be fully shown.

Description

technical field [0001] The invention relates to wind power generating equipment, in particular to a wind turbine adjusting device and a wind generating set including the adjusting device. Background technique [0002] In recent years, in order to increase the power generation of wind turbines in low wind speed wind farms without greatly increasing the construction cost, the main measures taken in the industry are to use the blades on the basis of the existing blades of the wind turbine rotor A hollow cylindrical wind wheel adjustment device is added between the root and the hub to increase the windward area of ​​the wind wheel and improve the wind capture performance of the wind wheel, such as the "wind wheel growth ring" disclosed in Chinese patent documents (public number: CN 201794723, open Date: April 13, 2011), "Wind Turbine Blade Adjustment Device and Wind Turbine Including the Adjustment Device" (public number: CN 201953566, publication date: August 31, 2011), etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D7/04
CPCF03D1/0675F05B2260/96Y02E10/72
Inventor 沈雨虹毛忠兴钟贤和石秉楠李杰孙仲泽董元元王文超王瑞陈慧珍邓智春
Owner 东方电气风电股份有限公司
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