RU2078251C1 - Device limiting rotational speed of rotor of windmill - Google Patents

Abstract

FIELD: wind-power engineering. SUBSTANCE: invention can be used in wind-driven plants of various purpose and capacity. For prevention of spinning of rotors (windwheels) up to dangerous rotational speeds during storm winds proposed device has braking plates 1 with tail parts 2 hinged to rim 3 of rotor 4 and pressed against rim 3 with springs 5. Tail parts of adjacent plates present bell-cranks interjointed by rods 6. For each adjacent pair of plates arms of bell-cranks of tail parts 2 and rod form parallelogram mechanism ensuring simultaneous turn of all plates. In this case condition $$$= 360 deg/n, where $$$ is angle between bell-cranks of tail part; n is number of plates, should be realized. Device as whole operates as aerodynamic brake with centrifugal regulator. EFFECT: prevention of dangerous spinning up of windwheels. 2 dwg

Description

 The invention relates to wind energy and can be used in wind turbines for various purposes and power.

 To prevent the spinning of rotors (windwheels) of wind turbines to dangerous speeds at storm winds, they are equipped with various types of braking mechanisms.

 So, it is known a wind wheel with a vertical shaft (autosw. N 1236149, class F 03 D 3/06, publ. 1986), on the blades of which spring-loaded plates are installed that act as an aerodynamic brake with increasing wind speed and wind speed.

 However, when these plates are mounted on rotors (windwheels) with an inclined and horizontal axis of rotation, gravity will cause their additional movement at each revolution, which will lead to an imbalance of the rotor. In addition, on rotors with a vertical axis of rotation, an imbalance can occur due to the uneven force of the springs and the different effects of wind on each of the plates.

 To expand the scope and improve reliability in the proposed device, the plates are pivotally mounted on the rim of the rotor, and for the simultaneous rotation of all the plates they are equipped with shanks in the form of two shoulders levers connected by articulated bonds of the parallelogram type.

 In FIG. 1 shows a General view of the rotor of a wind turbine with a device; in FIG. 2, view A in FIG. one.

где α угол между рычагами хвостовика;
n число пластин.A device for limiting the rotational speed of a wind turbine rotor contains rotary plates 1 with shanks 2 pivotally mounted on the rim 3 of the rotor 4 and pressed against the rim 3 by springs 5. The shanks of 2 adjacent plates, which are two-arm levers, are interconnected pivotally by rods 6. For each adjacent pairs of plates, the shoulders of the levers of the shanks 2 and the rods 6 form a parallelogram mechanism, which provides a simultaneous rotation of all the plates. In this case, the condition must be met:

where α is the angle between the levers of the shank;
n number of plates.

 The device operates as follows.

 With a small wind force and, accordingly, the rotor speed, the plates are pressed by springs to the rim and do not have a braking effect. With increasing wind force and rotor speed under the action of centrifugal forces of the plate, overcoming the force of the springs, they begin to turn on a hinge and have a braking effect on the rotor. In the longitudinal position, the plates are mounted perpendicular to the rim of the rotor.

 The device as a whole works as an aerodynamic brake with a centrifugal regulator and is configured by installing springs with certain characteristics on the rotor speed, starting from which it must be braked.

 The device has a simple design, does not require adjustments during operation and brakes the rotor at drilling wind speeds to an acceptable speed.

Claims (1)

 A device for limiting the rotational speed of a rotor of a wind turbine, containing brake spring-loaded plates as a centrifugal load, characterized in that the plates are pivotally mounted on the rim of the rotor, and the shanks of adjacent plates made in the form of two-arm levers are interconnected by hinges, forming a parallelogram mechanism.

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