RU2325552C1 - Rotor wind electric assembly - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: invention refers to improvement of rotor wind electric assemblies /WEA/. Equipped with blades and electro generator, the WEA has blades the shape of which is created by a cross of two parabolas Y₁=K₁X^1/2; Y₂=2R₀+K₂X^1/2, where K₁≥1; K₂=/0,4÷0,8/K₁, or with one parabola Y₁=K₁X^1/2, K₁≥1; at that the blades are equipped with valves in form of apertures; the apertures are covered with plugs which are held in place with flat springs attached to a rod; the rod is controlled with a centrifugal pendulum which controls power by partial opening or complete opening of apertures at a strong wind; at that ends of the blades are mechanically tied into a ring. The top of the blade is equipped with receptors of lightning protection via rotation axis and a cable connected to ground. Usage of the centrifugal pendulum facilitates control of power and provides protection of WEA. Receptors on the ends of blades connected via rotation axis and a cable to ground provide lightning protection of WEA. A ring form tie of the blades ends reduces noise produced by WEA.

EFFECT: increased efficiency of a wind electrical assembly and efficiency of wind usage with simplification of the design.

2 cl, 3 dwg

Description

The invention relates to the improvement of rotor wind turbines / wind turbines / through the use of a parabolic-shaped blade.

Known rotary wind power installation / 1 /, where the blade is formed by a sector of the circle, therefore, requires additional equipment, module, to adjust the direction of the wind. The disadvantage of this design is the inefficiency of the blade, the bulkiness of the installation.

Known propeller blade / 2 / having a profile of the blade from the suppression of two parabolas. The disadvantage of this design is the small lifting force with a limited length.

The technical result of the invention is to increase the efficiency of the installation, its power while reducing the amount of equipment and reducing noise. This result is achieved in a rotary wind turbine / wind turbine / equipped with an electric generator, in which the profile of the blade is formed by the intersection of two parabolas Y ₁ = K ₁ X ^1/2 ; Y ₂ = 2R ₀ + K ₂ X ^1/2 , where K ₁ ≥1; K ₂ = / 0.4 ÷ 0.8 / K ₁ , or one parabola: Y ₁ = K ₁ X ^1/2 , K ₁ ≥1, while the blades are equipped with valves in the form of holes, overlapped by plugs held by flat springs, attached to a pin controlled by a centrifugal pendulum, providing power adjustment by opening the holes and opening them completely in strong winds, and the ends of the blades are mechanically connected by a ring. In addition, the top of the blade is equipped with lightning protection receptors, connected through the axis of rotation and the cable to the ground.

Planes intersecting at an acute angle are rounded with a radius R≥Ro to increase strength. A wind turbine blade made of durable material is formed from one parabola: Y ₁ = K ₁ X ^1/2 , where K ₁ ≥1.

Figure 1 shows the profile of the blade formed by the intersection of two parabolas. Figure 2 shows the projection of the two blades of the concave working 1A and reverse, convex, overcoming the drag 1c. The blades are equipped with valves consisting of holes 4 and plugs 3 made of cotton rubberized material, lightweight artificial plastic or other material of relatively low weight, which ensures shape and performance under difficult weather conditions. The plugs are attached to the pin 6 by means of flat springs 5, which provide free clamping of the plugs in the working position of the blade and easy extraction during the frontal movement of the blade. The pin 6 is lowered by a lever 8, at the end of which a load 9 is fastened, acting as a centrifugal pendulum that rises during a set of revolutions, and a lowering pin 6, which carries the plugs 3, providing power adjustment within ± 20% and wind protection in case of a hurricane, this holes open completely. 7 - the support on which the lever is mounted 8. The holes from the plugs can be of various shapes - rectangular, triangular, oval, if only more accurate power control and wind protection are provided.

Figure 3 shows the wind turbine assembly, where 1 is the blades, 2 is the axis of rotation, 11 is an electric generator in the housing - 12, 10 is a mechanical ring that closes the ends of the blades to reduce free vibrations, 13 are lightning protection receptors that transmit through the axis of rotation, cable - 14 current to earth.

Since the resulting point of application of the forces of the concave parabola lies close to the axis of rotation (its focus), the wind yield of the wind turbine blades is increased and due to the decrease in drag due to the use of valves, the efficiency of the wind turbine increases, which also does not require a module for directing wind to the blades 1 and the use of a weather vane. Wind with a speed of more than 3 m / s begins to rotate the working blade around its axis. At the same time, the valves on the working blade are covered by the force of the wind, and on the blade overcoming the drag, the valves open. There is an increased set of speed and power that is given to the generator. When the wind speed exceeds the set value, a centrifugal pendulum is triggered, which opens part of the hole by shifting the plug. In this case, the wind turbine power is partially reduced. With increased wind, a squall, the holes open completely, you can also offer an electric brake, so as not to bring the wind turbine to destruction. This is the wind protection of wind turbines.

Lightning protection receptors are installed on the upper edge of the blade and through the axis of rotation, an electric current of lightning is transmitted through the cable to the ground. This is the lightning protection of wind turbines.

Comparative tests conducted on the fabricated mock-ups showed an increase in wind turbine power by more than 20% with a decrease in equipment by almost half compared to / 1 /. The ends of the blades mechanically closed by a ring in at least two places (above and below) provide a reduction in free vibrations / noise / by more than 30%.

Information sources

1. Patent No. 2215898 of 12/11/2003.

2. Patent No. 2228882 dated 05/20/2004.

Claims (2)

1. A rotary wind power installation (WPU), having a blade, generator, characterized in that the blade profile is formed by the intersection of the two parabolas Y ₁ = K ₁ X ^1/2; Y ₂ = 2R ₀ + K ₂ X ^{l / 2} , where K ₁ ≥1; K ₂ = (0.4 ÷ 0.8) K ₁ , or one parabola: Y ₁ = K ₁ X ^1/2 , where K ₁ ≥1, while the blades are equipped with valves in the form of holes covered by plugs held by flat springs attached to a pin controlled by a centrifugal pendulum, providing power adjustment by opening the holes and opening them completely in strong winds, and the ends of the blades are mechanically connected by a ring. 2. Installation according to claim 1, characterized in that the top of the blade is equipped with lightning protection receptors connected through an axis of rotation and a cable to the ground.

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