CN203879686U - Vertical axis wind turbine - Google Patents

Abstract

A vertical axis wind-driven generator comprises a rotating shaft, an upper wind blade bracket, a lower wind blade bracket and a plurality of wind blades connected with the upper wind blade bracket and the lower wind blade bracket, wherein an upper radial magnetic bearing, a lower radial magnetic bearing, a disc type permanent magnet generator and a variable inertia flywheel are sleeved on the rotating shaft, the upper radial magnetic bearing and the lower radial magnetic bearing are arranged at the upper part of the rotating shaft, the upper wind blade bracket is supported by the upper radial magnetic bearing, the lower wind blade bracket is connected to the periphery of a rotor of the disc type permanent magnet generator, the rotor is supported by the lower radial magnetic bearing, a stator of the disc type permanent magnet generator is arranged below the rotor, and the variable. The utility model discloses can start when lower wind speed, can not shut down when higher wind speed, and power output is stable.

Description

A vertical axis wind turbine

technical field

The utility model relates to a vertical axis wind power generator.

Background technique

Wind turbines are divided into horizontal type and vertical type according to the axis of rotation. The main advantage of vertical-axis wind turbines compared to horizontal-axis wind turbines is that they do not require a yaw system, which simplifies the design significantly.

The power output of the wind turbine is closely related to the wind speed. The starting wind speed of the wind turbine is generally 2.5-4m/s, and the rated output capacity is reached when the wind speed is 12-15m/s. , usually when the wind speed is 20-25m/s, it needs to be shut down.

Existing wind generators cannot be started when the wind speed is less than 2.5m/s, and braking devices are usually used when the wind speed is relatively high. The Chinese patent No. 200820119378.3 utility model patent specification discloses a new type of vertical axis wind power generator, which is a vertical axis wind power generator with a braking system. A wind turbine using a braking device will cause waste of energy, and the output power is unstable.

Utility model content

The purpose of the utility model is to propose a vertical axis wind power generator which can be started at a lower wind speed, will not stop at a higher wind speed and has stable power output.

In order to achieve the above object, the utility model adopts the following technical solutions: the vertical axis wind power generator has a rotating shaft, an upper blade bracket, a lower blade bracket, and several blades connected to the upper and lower blade brackets, and the upper diameter is set on the rotating shaft. Directional magnetic bearings, lower radial magnetic bearings, disc permanent magnet generators, variable inertia flywheels, upper and lower radial magnetic bearings are located on the upper part of the rotating shaft, the upper fan blade bracket is supported by the upper radial magnetic bearing, and the lower fan blade bracket is connected to the The outer periphery of the rotor of the disc permanent magnet generator, the rotor is supported by the lower radial magnetic bearing, the stator of the disc permanent magnet generator is located below the rotor, and the variable inertia flywheel is located at the lower part of the rotating shaft.

The variable inertia flywheel includes a flywheel bracket closely matched with the rotating shaft. The flywheel bracket has 3 to 4 hollow arms evenly distributed, and variable mass blocks and springs are sequentially arranged in the cavity of the hollow arms from inside to outside.

A buffer partition is provided in the cavity of the hollow arm and at the inner end.

The variable mass block is preferably a steel ball.

The utility model has the following positive effects: (1) The vertical axis wind power generator proposed by the utility model adopts radial magnetic bearings to connect the fan blade bracket and the rotor of the disc permanent magnet generator on the rotating shaft, and applies the magnetic levitation technology to the vertical On the vertical axis wind turbine, the vertical axis wind turbine can be started at lower wind speeds. (2) When the rotating shaft rotates to a certain angular velocity, the variable mass block overcomes the elastic force of the spring under the action of centrifugal force, so that the variable mass block moves away from the center of the rotating shaft in the cavity of the hollow arm of the flywheel bracket. With the increase of the angular speed of the rotating shaft, The variable mass block is getting farther and farther away from the axis, and the angular momentum provided by the blades of the wind turbine is converted to the variable inertia flywheel to control the speed of the wind turbine shaft, so there is no need to stop at high wind speeds. The storage battery is prevented from being damaged due to exceeding the rated angular velocity. (4) The structure of the variable inertia flywheel is simple and easy to adjust. The mass of the variable mass block can be adjusted according to the specific conditions of the wind turbine. The storage range of the moment of inertia is determined by the weight of the variable mass block. The spring stiffness is easy to estimate according to the actual load, which will determine where the vertical axis wind turbine shaft is located. Angular velocity begins to store excess angular momentum on the variable inertia flywheel. (5) The thin disc generator is directly integrated with the wind wheel, with a compact structure, eliminating the need for a long and heavy main drive shaft, and the disc generator has little resistance to the wind and has little impact on the air flow.

Description of drawings

Fig. 1 is a schematic front view of the utility model.

Fig. 2 is a schematic top view of the utility model.

Detailed ways

Example 1

See Fig. 1 and Fig. 2, the utility model has rotating shaft 1, upper fan blade bracket 2, lower fan blade bracket 7 and several fan blades 3 connected on the upper and lower fan blade brackets, rotating shaft 1 is covered with upper radial magnetic bearing 4, Lower radial magnetic bearing 5, disc permanent magnet generator 6, variable inertia flywheel 8. The upper and lower radial magnetic bearings 4 and 5 are located on the top of the rotating shaft 1, and the upper radial magnetic bearing 4 and the lower radial magnetic bearing 5 are magnetic bearings with three magnetic pole structures. In order to facilitate control, their physical structure, parameters same. The upper fan blade support 2 is set on the upper radial magnetic bearing 4 and is supported by the upper radial magnetic bearing 4, and the lower fan blade bracket 5 is connected to the outer circumference of the rotor 6-1 of the disc permanent magnet generator 6, and the rotor 6-1 is sleeved on the lower radial magnetic bearing 4. On the magnetic bearing 5, it is supported by the lower radial magnetic bearing 5. The width of the air gap between the upper radial magnetic bearing 4 and the lower radial magnetic bearing 5 relative to the rotating shaft is between 0.3 mm and 0.5 mm.

The stator 6-2 of the disc permanent magnet generator 6 is located below the rotor 6-1, and the stator 6 is loosely fitted on the rotating shaft and supported by a special support.

The variable inertia flywheel 8 is at the bottom of the rotating shaft 1 . The variable inertia flywheel 8 includes a flywheel bracket 8-1 tightly matched with the rotating shaft 1, the flywheel bracket 8-1 has 3 to 4 horizontal hollow arms 8-1a evenly distributed, and the outer surface of each hollow arm 8-1a The ends are connected to vertical strips 8-1b. This embodiment has four hollow arms 8-1a, and the cavity of the hollow arms is sequentially provided with a buffer partition 8-4, a variable mass 8-2 and a spring 8-3. Variable mass block 8-2 is preferably with steel ball. The gap between the buffer dividing plate 8-4 and the rotating shaft is a buffer zone, which prevents steel balls from bumping into the rotating shaft.

The variable mass and spring of the variable inertia flywheel are important design parameters. The weight of the variable mass will affect the range of the moment of inertia that can be stored. The spring stiffness design will determine the wind turbine at any angular velocity. Start storing excess angular momentum in the variable inertia flywheel.

Claims (4)

1. a vertical axis aerogenerator, there is rotating shaft (1), upper blade support (2), lower blade support (7) and being connected to, some fan blades (3) on lower blade support, it is characterized in that: the upper cover of rotating shaft (1) has upper radial direction magnetic bearing (4), lower radial direction magnetic bearing (5), disk permanent magnet generator (6), variable inertial flywheel (8), on, lower radial direction magnetic bearing (4, 5) top in rotating shaft (1), upper blade support (2) is supported by upper radial direction magnetic bearing (4), lower blade support (5) is connected to the periphery of the rotor (6-1) of disk permanent magnet generator (6), rotor (6-1) is supported by lower radial direction magnetic bearing (5), the below of the stator (6-2) of disk permanent magnet generator (6) in rotor (6-1), the bottom of variable inertial flywheel (8) in rotating shaft (1).

2. vertical axis aerogenerator according to claim 1, it is characterized in that: described variable inertial flywheel (8) comprises and the friction tight flywheel-bracket of rotating shaft (1) (8-1), flywheel-bracket (8-1) has equally distributed 3 to 4 hollow arm (8-1a), is provided with successively from the inside to the outside variable-quality piece (8-2) and spring (8-3) in the chamber of hollow arm.

3. vertical axis aerogenerator according to claim 2, is characterized in that: in the chamber of described hollow arm (8-1a) and in inner end, be provided with buffering dividing plate (8-4).

4. vertical axis aerogenerator according to claim 2, is characterized in that: variable-quality piece (8-2) is taking steel ball as good.