CN102192097A - Wind-pressure type blade-changing device of wind turbine - Google Patents

Abstract

The invention relates to a wind pressure type pitch changing device of a wind power machine, which belongs to the field of wind power machines. The blades of the device are hinged on the hub to form a wind wheel system and a double-slider multi-link mechanism for controlling the pitch. The wind wheel is installed on the rotating shaft of the generator, the energy storage spring is coaxial with the rotating shaft, and its front end is connected with the blade by a steel wire rope. Because the blades of the device are in a state of large angle of attack before the start of the wind turbine, it is convenient for the start of the wind turbine; the pitch changing device stabilizes the output characteristics of the wind turbine, and the wind turbine operates safely; the mechanical transmission system of the pitch changing device has a simple structure and reduces manufacturing cost.

Description

Wind pressure type pitch device for wind turbine

Technical field

The patent of the present invention is a wind pressure type pitch changing device of a wind turbine, which belongs to the field of wind turbines.

Background technique

Currently, the pitch devices used on small wind turbines are generally centrifugal pitch or electronically controlled pitch. The control of the rotational speed in the centrifugal variable pitch is a positive feedback regulation. With the increase of the wind speed, the increase of the power can only be slowed down; the purpose of control cannot be fully achieved; while the electric control variable pitch has actuators and measurement and control components, the structure It is very complicated and very uneconomical to use on small wind turbines.

Contents of the invention

In order to overcome the deficiencies of the existing wind turbine pitch change device with complex structure and low pitch change efficiency, the patent of the present invention proposes a new wind energy conversion device—the wind pressure type pitch change device of wind turbine.

The wind pressure type pitch change device of the patented wind turbine of the present invention is mainly composed of energy storage springs, steel wire ropes, hubs, blades, rotary shafts, connecting rod mechanisms and the like. Its structure is that the blades are hinged on the hub to form a wind turbine system and a double-slider multi-link mechanism that controls the pitch. The wind wheel is installed on the rotating shaft of the generator, the energy storage spring is coaxial with the rotating shaft, and its front end is connected with the blade by a steel wire rope.

The working process of the wind pressure type pitch changing device of the wind turbine is: as the natural wind speed increases, the positive pressure of the wind on the sweeping surface of the wind wheel also increases. When the wind speed is greater than the rated wind speed, the wind pressure overcomes The resistance of the spring makes the wind wheel move horizontally along the wind direction. When the wind wheel moves horizontally, the installation angle of the blade is changed through the connecting rod fixed on the hub and the blade, so that the blade changes pitch and the lift force is reduced to reach the limit. The purpose of speed; when the wind speed becomes small, the spring overcomes the wind pressure, and the wind rotor moves in the opposite direction (incoming flow direction), and the blades are reversely pitched through the connecting rod, so as to maintain the speed of the wind rotor and improve the utilization rate of wind energy.

The wind pressure type pitch changing device of the wind turbine, the blades are in the state of a large angle of attack before the wind turbine is started, which is convenient for the start of the wind turbine; the pitch changing device makes the output characteristics of the wind turbine stable, and the wind turbine runs safely; the mechanical transmission of the pitch changing device The system structure is simple, and the manufacturing cost is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS: Figure 1 is a schematic diagram of the operation of the wind pressure type pitch control device of the wind turbine.

The specific implementation method: embodiment (seeing Fig. 1)

The wind pressure type pitch change device of the patented wind turbine of the present invention is mainly composed of energy storage spring 1, steel wire rope 2, hub 3, blade 4, rotating shaft 6, connecting rod mechanism 6, etc.; blade 4 is hinged on hub 3 to form a wind wheel system And a dual-slider multi-link mechanism that controls the pitch. The wind wheel is installed on the rotary shaft 5 of the generator 7, the energy storage spring 1 is coaxial with the rotary shaft 5, and the free end of the energy storage spring 1 is connected with the root of the blade 4 through a wire rope 2.

Claims (1)

1. patent of the present invention is a kind of wind energy conversion system wind pressure type vane change device, and it mainly is made of energy storage spring, wire rope, wheel hub, blade, turning axle, linkage mechanism; The blade hinge joint forms the double-slider multi-connecting-rod mechanism of wind wheel system and control pitch on wheel hub; Wind wheel is contained on the turning axle of generator, and energy storage spring is coaxial with turning axle, and its front end is linked by wire rope and blade.

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