CN216198625U

CN216198625U - Windmill blade structure with self-variable pitch

Info

Publication number: CN216198625U
Application number: CN202122439108.9U
Authority: CN
Inventors: 郑峻山
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-10-11
Filing date: 2021-10-11
Publication date: 2022-04-05
Anticipated expiration: 2031-10-11

Abstract

The windmill blade structure with self-variable blade pitch is characterized by that it utilizes main components of blade, blade shaft, blade disk, rocker arm, connecting rod, blade pitch synchronous ring and tension spring to make them be assembled and connected, so that the blade pitch of the windmill blade can be automatically regulated according to the wind speed to form the working states of small wind speed, large wind speed and small wind facing surface. Under the condition of the technical scheme, the number of blades of the windmill can be increased, the wind energy utilization rate under the condition of low wind speed is improved, and the breakage of the blades of the windmill under the condition of high wind speed is reduced.

Description

Windmill blade structure with self-variable pitch

Technical Field

A windmill of a wind power generator, in particular to a windmill blade structure which can automatically adjust the pitch when being pressed by wind.

Background

In the technical application of windmills, such as large-scale wind power generators, small-scale outdoor portable wind power generators and the like, the larger the windward area of the blades of the windmills, i.e. the larger the blade area or the larger the number of the blades, the higher the utilization rate of wind energy. However, the wind in nature is not constant, and the size is rapidly and slowly variable. Therefore, a contradiction exists, the utilization rate can be increased when the wind speed is small and the area is large, and the kinetic energy can be obtained under the condition of small wind speed. When the wind speed is high, the area is large, but the rotating speed of the windmill is too high, and the blades are deformed and damaged to lose functions.

Disclosure of Invention

In order to solve the problems that the windmill can have enough wind area at low wind speed and can reduce the wind area at high wind speed, and the windmill is prevented from being damaged due to overhigh rotating speed, the invention provides a windmill blade structure scheme capable of automatically adjusting the blade pitch. The principle of the wind turbine is that the acting force of wind pressure on a blade surface is utilized to cause the deflection of the blade, a certain resistance is set in the deflection process, and the deflection can be generated when the moment of the deflection of the blade under pressure is larger than the resistance moment, so that the windward area of the windmill is reduced. Its main spare part includes: the blade, the oar axle, the bladed disk, the rocking arm, the connecting rod, the off-set synchronizer ring, the resistance extension spring. One end of the paddle shaft is inserted into the blade to be fixed, then the paddle shaft is inserted into the shaft hole of the blade disc, and the rocker is fixed with the tail end of the paddle shaft to form the blade deflection mechanism. The connecting rod is connected with the rocker and the offset synchronizing ring, one end of the tension spring is connected with the leaf disc, and the other end of the tension spring is connected with the offset synchronizing ring, so that a deflection resistance mechanism is formed. All the blades are connected in the same way to form a blade group, and the synchronous ring is connected with all the blade connecting rods to realize synchronous equidistant deflection of all the blades. The method is characterized in that: when the windmill blade is acted by high-speed wind, the offset force generated around the blade shaft is larger than the deflection resistance, the blade deflects backwards, the blade pitch is increased, the windward side is reduced, when the wind speed and the wind pressure are reduced, the offset force is smaller than the offset resistance, the blade pitch rotates and resets, and the windward side is increased. The working state of small wind speed, large windward side and small windward side is formed

The beneficial effect of this application is that can increase the blade number of windmill relatively, shorten blade length. More wind kinetic energy is obtained under the condition of low wind speed, and the blade is prevented from rotating, over-speed and breaking at high wind speed. The utilization rate of the windmill to wind energy is improved, and the wind power generation efficiency is improved.

Drawings

FIG. 1: schematic diagram of windmill pitch initial state

FIG. 2: schematic diagram of windmill pitch deflection state

FIG. 3: wind direction schematic diagram of windmill

FIG. 4: schematic diagram of windmill structure

FIG. 5: schematic diagram of single-blade deflection structure of windmill

FIG. 6: schematic diagram of single-blade deflection structure of windmill

FIG. 7: schematic diagram of single-blade deflection structure of windmill

FIG. 8: schematic diagram of single-blade deflection structure of windmill

FIG. 9: schematic diagram of single-blade three-dimensional structure of windmill

FIG. 10: schematic three-dimensional structure of windmill blade set

In the figure: 1 blade, 2 oar axles, 3 leaf discs, 4 rockers, 5 connecting rods, 6 propeller pitch synchronizing rings, 7 synchronizing ring spring blind nails, 8 tension springs and 9 leaf disc spring blind nails. 10 leaf disc guide cylinders and 11 synchronous ring sleeve cylinders.

Detailed Description

As shown in the figure, a blade 1 and a paddle shaft 2 are fixed, the paddle shaft is inserted into a shaft hole of a blade disc 3, the blade and the blade disc are connected in a rotating mode, a rocker 4 is fixed at the tail end of a rotating shaft, and an initial state that the rocker forms an included angle of 90 degrees with the shaft center and the blade forms an included angle of 45 degrees with the shaft center is formed. The blade disc guide cylinder 10 is fixed with the blade disc, the blade pitch synchronizing ring 6 is fixed with the synchronizing ring sleeve 11, the synchronizing ring sleeve is sleeved on the guide cylinder, a tension spring 8 is arranged in the sleeve, the tension spring is fixed by using a synchronizing ring spring rivet 7 and a blade disc spring rivet 9, and tension force (resistance force) for relative movement of the synchronizing ring and the blade disc is formed. The rocker and the synchronous ring are connected by a connecting rod 5 to form a windmill blade structure which passively generates pitch change under the action of wind pressure.

Claims

1. A windmill self-pitching blade structure mainly comprises the following components: the device comprises blades, a paddle shaft, a blade disc, a rocker arm, a connecting rod, an offset synchronizing ring and a resistance tension spring; the method is characterized in that: when the windmill blade is acted by high-speed wind, the offset force generated around the blade shaft is larger than the deflection resistance, the blade deflects backwards, the blade pitch is increased, the windward side is reduced, when the wind speed is reduced, the offset force is smaller than the offset resistance, the blade pitch rotates and resets, the windward side is increased, and the working state of the windward side with low wind speed and high wind speed and the windward side with high wind speed is formed.