JP5365959B2 - Flat-blade cantilever support type with fan angle adjustment (round fan type) multi-blade propeller type windmill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve wind turbine performance by the blade angle adjusting function, by improving a structure of a rotary blade (a blade) of a multi-blade propeller wind turbine. <P>SOLUTION: This wind turbine is constituted by being firmly fixed by a surface, by fan-fastening 3 a plate material (a plate blade 2) of a specific shape such as a high elasticity, high tension and lightweight wood, high strength steel and resin by a fitting strip of a distal end part of an arm 1, to a position of an outer peripheral part for providing driving force by a main wind receiving surface, by forming a root part of the rotary blade having little influence on the wind turbine performance as a strong arm 1 structure. When a rotor starts to rotate, the flat-plate airfoil is deformed (bent) 9 by centrifugal force and wind pressure generated from an eccentric shelf shape, and a blade angle (an installation angle with every blade diameter) gradually follows over a blade distal end part 8 from a fan-fastened place, and the angle can be adjusted by a wind speed and a rotating speed, and connection reinforcement between the blades of a conventional multi-blade wind turbine can be obviated by a single and compact structure. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

The present invention relates to a flat-blade cantilevered support type (round fan type) multi-blade propeller type windmill with a blade angle adjustment function capable of adjusting a blade angle.

Technical background

In wind turbine power generation equipment that uses wind power, which is a renewable energy, a multi-blade wind turbine represented by an American wind turbine has an advantage that it has excellent startability at low wind speeds and exhibits high wind turbine efficiency.

However, the wind turbine efficiency decreases conversely at medium to high wind speed, which is the most important energy demand. Furthermore, there was a risk that the rotor could be damaged due to over-rotation during strong winds, and there was a drawback that it was not possible to increase the size or introduce it.

In the expansion of wind power generation, improvement of wind turbine efficiency and increase in size are listed as important solutions. This shortcoming is a major obstacle, and the current penetration rate of multi-blade wind turbines is very low.

As a measure to improve this, it is difficult to improve the efficiency of wind turbines at low to medium wind speeds, even if the latest wind turbine blades with a cross-sectional structure are used for the rotor blades of a multiblade wind turbine. Equipment costs increase, making installation difficult.

JP 2006-152864 A

Ushiyama Izumi and Mino Masahiro "Small Windmill Handbook" Power Company 1994 54p, 55p, 121p

By improving the structure of the rotor blades of the multi-blade propeller wind turbine, the wind turbine performance is improved by adjusting the blade angle.

In the present invention, the rotor blade is a flat plate blade having a fixed shape, and the outer peripheral portion of the plate blade from which the driving force is obtained on the main wind receiving surface is made of wood, high-tensile steel or resin having high elasticity, high tension and light weight. A flat plate blade and an arm structure that forms a root part that has a small wind receiving area and a low peripheral speed and has little influence on the wind turbine performance. The flat blades are elastically deformed by the centrifugal force and wind pressure generated by the rotation of the rotor, because the blade core is curved and eccentric with respect to the blade axis. By changing the plate thickness of the flat blade, the chord length, and the amount of eccentricity with respect to the blade axis, the angle of attack with respect to the wind for each blade diameter can be adjusted from the fan stopper to the blade tip.

Flat blades can adjust the angle of attack to the wind for each blade diameter, so low to high wind speeds can be adjusted. It is possible to improve the wind turbine efficiency at all wind speeds. During a storm, the wind pressure resistance can be suppressed by changing the pitch angle of the flat blade with the blade cross section having a linear shape to the cutout position. The blade can be manufactured uniformly and easily from a simple and simple structure. Since the wind turbine characteristics vary greatly depending on the mechanical characteristics, shape, surface treatment, etc. of the flat plate blade material, an effect that can be used as a flat blade characteristic tester for the purpose of improving the wind turbine performance of the flat plate blade is obtained.

(Example 1) It is structure explanatory drawing of the flat-blade cantilever support type (round fan type) multiblade propeller type windmill with a blade angle adjustment function. (Example 2) It is a structure explanatory drawing of the flat-blade cantilever support type (round fan type) multiblade propeller type windmill with a blade angle adjustment function. (Example 3) It is structure explanatory drawing of the flat-blade cantilever support type (round fan type) multiblade propeller type windmill with a blade angle adjustment function.

Adjusting the blade angle of a multi-blade wind turbine to improve wind turbine efficiency is based on the thickness, blade chord length, and blade axis of flat blades (such as high-tensile steel plates, resin plates, and wood plates) with a simple structure. This was achieved by changing the lead amount.

FIG. 1 is a front view and a side view (cut-in, cut-out) of a flat-blade cantilever support type (round fan type) multi-blade propeller type wind turbine with blade angle adjustment function. FIG. 2 is a plan view of a flat blade, a side view, and an elastic deformation (flexion) view. FIG. 3 is a detailed view of the fan stopper (wing fixing portion).

The structure of each rotor blade of a multi-blade propeller wind turbine has a strong one-arm structure at the root of the rotor blade, and is made of wood, high-strength steel, resin, etc. that are highly elastic, high-tensile and lightweight. A flat plate material (2 flat blades) is constructed by fixing 3 round fans (wing fixing portions) with 18 scissors plates at the tip of one arm and firmly fixing the surface. Is curved and eccentric with respect to the 5-blade axis, so that it is 9 elastically deformed (bent) due to centrifugal force (centrocentric force with respect to the 14-rotor rotating surface) and wind pressure caused by the rotation of 12 rotors. By changing the plate thickness, chord length, and eccentricity with respect to the 5-blade axis, the blade angle (attachment angle for each blade diameter (attack angle against the wind)) from the three round fan stoppers (blade fixing part) to the eight blade tips (Not the pitch angle).

The structure of the three round fan stoppers (blade fixing portion) is fixed by inserting two flat blades into an 18 scissor plate and 10 main fixing bolts and 11 sub fixing bolts arranged radially. In the drilling of the two flat blades into which the 10 main fixing bolts are inserted, an expansion margin is provided on the outer peripheral side of the 14 blade shaft. The hole drilling on the side of the two flat blades into which the 11 sub-fixing bolts are inserted is made into a long hole in the radial shaft from the 10 main fixing bolt core with a width narrower than the bolt diameter. Yes. With this connection structure, the problem of thermal expansion due to the difference in material can be solved, and the rotational force of the two flat blades can be reliably transmitted to the one arm side.

Flat blades can be mass-produced, and the cost of rotating blades can be reduced. Moreover, since it is a flat plate, it is easy to attach a solar panel for power generation or a heat ray panel for preventing snow contact. As an application, it is considered effective to use it for a medium-sized or smaller scale in a wind power generation facility. It is expected to provide employment as an after-sales business, as well as energy supply, with a scale that allows easy replacement of flat blades and improved maintainability, creating a power generation facility that is closely connected to the region.
In addition, it can be placed at regular intervals in the mega solar facility as an installation location, and it will be possible to construct a high-efficiency energy facility with added value, such as sharing the lightning protection for mega solar facilities. .

1. Arm 2: Flat wing 3: Round fan (wing fixing part)
4: Autumn leaf seed shape 5: Blade shaft 6: Blade core 7: Direction of rotation 8: Blade tip 9: Elastic deformation (bending)
10: Main fixing bolt 11: Sub-fixing bolt 12: Rotor 13: Wind 14: Rotor rotating surface 15: Cutout 16: Cut-in 17: Nacelle 18: Scissor plate 19: Expansion allowance 20: Long hole

Claims (1)

In the present invention, the rotor blade is a flat plate blade having a fixed shape, and the outer peripheral portion of the plate blade from which the driving force is obtained on the main wind receiving surface is made of wood, high-tensile steel or resin having high elasticity, high tension and light weight. A flat plate blade and an arm structure that forms a root part that has a small wind receiving area and a low peripheral speed and has little influence on the wind turbine performance. The flat blades are elastically deformed by the centrifugal force and wind pressure generated by the rotation of the rotor, because the blade core is curved and eccentric with respect to the blade axis. A rotor blade of a multi-blade propeller wind turbine that can adjust the angle of attack for each blade diameter from the fan end to the blade tip by changing the thickness of the flat blade, the chord length, and the amount of eccentricity with respect to the blade axis.

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