CN202475129U - Speed limiting device for wind driven generator - Google Patents

Abstract

The utility model relates to a wind power generator speed limiting device, which comprises a central disk and a friction cylinder, the central disk is sleeved on the rotor shaft of the generator, the friction cylinder is connected with the generator casing, the friction cylinder is cylindrical, and The surface is a friction surface, and the center disk is set in the inner cavity of the friction cylinder; the center disk is provided with at least two guide grooves, and a slider is arranged in the guide groove, and a friction plate is arranged on the outer surface of the slider along the circumferential direction. One end of the tension spring is connected with the slide block, and the other end is connected with the guide groove. The speed limiting device of the utility model is simple, practical and low in cost, and can be used to limit the rotating speed of the generator, thereby achieving the purpose of effectively protecting the generator, improving the working safety of the wind generator, and prolonging the use of the wind generator life.

Description

Wind turbine speed limiting device

technical field

The utility model belongs to the technical field of electric power equipment, in particular to a speed limiting device of a wind power generator.

Background technique

In recent years, due to the rapid development of my country's economy and the promotion of the government's "power transmission to the countryside" project, small household wind turbines are being popularized at a relatively fast speed in pastures, mountainous areas, islands and other remote areas lacking electricity. Solve the problem of difficult electricity use in these areas.

The above-mentioned power-shortage areas have a common feature, that is, they are rich in wind power resources, and the wind power generators used are basically between 500W and 2000W. Due to the relatively backward economy of the regions where wind power generators are used, users have higher requirements on the performance-price ratio of generators. That is to say, the generator is required to be durable and the price should be low. In areas with rich wind resources, although it is very beneficial for the generator to work, such a working environment often causes the generator to rotate too fast. Shortened service life. At present, the common practice of domestic wind turbine manufacturers is: when the speed of the generator exceeds double the rated speed, unload the output of the generator to a high-power resistor of about 1 ohm, so as to increase the output of the generator. The load to achieve the purpose of generator deceleration. And this deceleration method often makes the generator windings heat up due to overload, and the heating will eventually burn out the motor windings. This situation has a certain impact on the service life of the wind turbine and its further promotion and use. .

Utility model content

The utility model overcomes the deficiencies in the prior art, and provides a speed-limiting device for a wind-driven generator that can improve the safety of the wind-driven generator and prolong the service life.

The concrete technical scheme of the utility model is as follows:

A wind-driven generator speed limiting device, comprising a central disk and a friction cylinder, the central disk is sleeved on the rotor shaft of the generator, the friction cylinder is connected with the generator casing, the friction cylinder is cylindrical, and its inner surface is a friction surface , the center plate is set in the inner cavity of the friction cylinder; the center plate is provided with at least two guide grooves, a slider is arranged in the guide groove, a friction plate is arranged on the outer surface of the slider along the circumferential direction, and one end of the tension spring It is connected with the slider, and the other end is connected with the guide groove.

As an improvement, the central disk is connected to the rotor shaft of the generator through a connecting piece.

As an improvement, the guide grooves include three, which are evenly arranged along the circumferential direction; the guide grooves are evenly arranged along the circumferential direction, and the center disk is relatively stable when the rotor rotates, and the motor will not vibrate due to unbalanced rotation.

As an improvement, the guide groove is a sector ring.

When the above-mentioned wind power generator is used, since the center disk is sleeved on the rotor shaft of the generator, the center disk rotates together with the rotor shaft. At 750 rpm, at this time, the generator runs so that the centrifugal force generated by the slider is not enough to overcome the tension of the tension spring, so the speed limiting device does not work; when the wind speed reaches level 9 (that is, the wind speed is greater than 24 m/s), power generation The speed of the generator is greater than 800 rpm. At this time, the speed limiting device fixed on the rotor shaft of the generator is under the action of its centrifugal force, so that the slider begins to overcome the tension of the tension spring, and moves from the inside to the outside through the guide groove. If the rotating speed is further increased, the centrifugal force on the slider will be further increased, and the increase in centrifugal force will cause the slider to move further, and finally the friction plate on the outer surface of the slider will contact the inner surface of the friction cylinder, so that the friction resistance of the motor rotor will increase. Increase, forcing the generator speed to drop, so as to achieve the purpose of generator speed limit.

The speed limiting device of the utility model is simple, practical and low in cost, and can be used to limit the rotating speed of the generator, thereby achieving the purpose of effectively protecting the generator, improving the working safety of the wind generator, and prolonging the service life of the wind generator .

Description of drawings

Fig. 1 is the structural representation of wind power generator;

Fig. 2 is a cross-sectional view of the speed limiting device in the direction A-A of Fig. 1 and the generator casing.

Detailed ways

Further illustrate the utility model below in conjunction with accompanying drawing.

Referring to Fig. 1 and Fig. 2, the wind power generator 1 is provided with a generator casing 5, and the friction cylinder 4 is connected with the generator casing 5 through screws. The friction cylinder 4 is cylindrical, and its inner surface is a friction surface. Set in the inner cavity of the friction cylinder 4, the center disk 2 is provided with a fixed sleeve 6, the fixed sleeve 6 is set on the rotor shaft 3 of the generator 1, and the connecting piece connects the fixed sleeve 6 with the rotor shaft of the generator 1 3 is fixed, and said connector can be bolt.

Three fan-shaped annular guide grooves 7 are evenly arranged on the center disk 2 along the circumferential direction. The number of guide grooves 7 can be determined according to the situation. Generally speaking, it is the same as the number of blades and is parallel to the blades. A slider 10 is provided, and the outer surface of the slider 10 along the circumferential direction is provided with a friction plate 8 . One end of the tension spring 9 is connected with the slider 10 , and the other end is connected with the guide groove 7 .

When the above-mentioned wind power generator is used, since the center disk is sleeved on the rotor shaft of the generator, the center disk rotates together with the rotor shaft. At 750 rpm, at this time, the generator runs so that the centrifugal force generated by the slider is not enough to overcome the tension of the tension spring, so the speed limiting device does not work; when the wind speed reaches level 9 (that is, the wind speed is greater than 24 m/s), power generation The speed of the generator is greater than 800 rpm. At this time, the speed limiting device fixed on the rotor shaft of the generator is under the action of its centrifugal force, so that the slider begins to overcome the tension of the tension spring, and moves from the inside to the outside through the guide groove. If the rotating speed is further increased, the centrifugal force on the slider will be further increased, and the increase in centrifugal force will cause the slider to move further, and finally the friction plate on the outer surface of the slider will contact the inner surface of the friction cylinder, so that the friction resistance of the motor rotor will increase. Increase, forcing the generator speed to drop, so as to achieve the purpose of generator speed limit.

The utility model is especially suitable for small wind power generators.

Of course, the above are only specific application examples of the utility model, and do not constitute any limitation to the protection scope of the utility model. In addition to the above embodiments, the utility model can also have other implementations. All technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope of the utility model.

Claims (4)

1. A wind-driven generator speed limiting device is characterized in that it comprises a central disk and a friction cylinder, the central disk is sleeved on the rotor shaft of the generator, the friction cylinder is connected with the generator casing, the friction cylinder is cylindrical, and The inner surface is a friction surface, and the center disk is set in the inner cavity of the friction cylinder; the center disk is provided with at least two guide grooves, a slider is arranged in the guide groove, and friction plates are arranged on the outer surface of the slider along the circumferential direction , one end of the tension spring is connected with the slider, and the other end is connected with the guide groove. 2. The wind power generator speed limiting device according to claim 1, characterized in that the central disk is connected to the rotor shaft of the generator through a connecting piece. 3. The wind power generator speed limiting device according to claim 1, characterized in that the guide grooves include three, uniformly arranged along the circumferential direction. 4. The wind power generator speed limiting device according to any one of the preceding claims, characterized in that the guide groove is fan-shaped.

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