CN2813914Y - Resistance and lift force compound wind power equipment - Google Patents

Abstract

The utility model relates to a resistance and lift composite wind power device. The utility model mainly improves the wind rotor of the wind power generator. The airfoil blade of the wind rotor is a special-shaped structure with a concave curved surface made of a thin plate, and the airfoil lower surface of the hollow airfoil blade is vacant. , and a plurality of blades are fixed axially and evenly on the rotating shaft of the wind wheel as the torque output shaft by means of connecting rods. The lower surface of the integrated blade airfoil faces outward, and the chord and fixed The included angle of the connecting rod of the fan blade is 60°-70°. Its characteristic is that the wind blade has the combined effect of resistance and lift force, and does not need to be equipped with a wind direction device. It is easy to start when the wind speed is low. When the wind speed is out, the reverse resistance produced by the fan blades is proportional to the square of the relative wind speed of the fan blades, so that it has the effect of automatic speed limiting, and there is no need to set up a special speed limiting device.

Description

Drag and lift composite wind power plant

technical field

The utility model relates to a comprehensive wind power device which converts wind energy into mechanical energy and has both resistance and lift of a vertical axis—a composite wind power device of resistance and lift.

Background technique

Existing wind turbines have two types of wind turbines: horizontal axis and vertical axis wind turbines: horizontal axis wind turbines use propeller wind turbines to convert lift into shaft torque. Due to the high starting wind speed of this form, a wind direction device and a speed limiting device are required, so it is difficult to manufacture, install and maintain, and the cost is high.

The structure of the vertical axis wind turbine is divided into two types of wind rotors: drag type and lift type. One of the drag formulas is to use the difference between the downwind side and the upwind side to form the torsional moment of the main shaft. The structure of this form is simple, but the utilization efficiency of wind power is low. In addition, the representative Darrieus type wind power device of the lift type still has problems such as high starting wind speed and needing a speed limiting device.

In a word, in the prior art, the wind rotor of the wind turbine can only be limited to a single structural form utilizing the resistance or lift of the wind blades.

Invention content:

The purpose of the present invention is to provide a drag and lift composite wind power device to make up for the deficiencies in the prior art.

The utility model is based on the prior art, and mainly improves the wind rotor of the wind power generator. The airfoil blade of the wind rotor is a special-shaped structure with a concave curved surface made of a thin plate, and the hollow airfoil The lower surface of the fan blade is blank, and a plurality of fan blades are fixed on the rotating shaft of the wind wheel according to the axial uniform distribution by means of the connecting rod. The included angle of the connecting rod of the fan blade is 60°-70°.

Considering the convenience of assembly, the above-mentioned blades of the wind rotor may have an even number of blades and are fixed axially symmetrically on the rotating shaft of the wind rotor by means of connecting rods.

The fan blade of the utility model has the combined effect of resistance and lift force, and does not need to be equipped with a wind direction device. It is easy to start when the wind speed is low. After starting, the resistance and lift force are superimposed to drive the wind wheel together. The reverse resistance generated by the fan blades automatically limits the speed, and there is no need to set up a special speed-limiting device.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the utility model.

Figure 2 Front view of the airfoil blade.

Figure 3 is the top view of the airfoil blade.

Wherein 1, fan blade, 2, connecting rod, 3, wind wheel rotating shaft.

Detailed ways

The wing airfoil blade 1 of the wind wheel of the utility model is a special-shaped structure with a concave curved surface made of a thin plate. The connecting rods 2 are uniformly distributed in the axial direction and fixed on the rotating shaft 3 of the wind wheel as the torque output shaft, the lower surface A of the airfoil of the airfoil 1 faces outward, and the chord of each airfoil blade 1 is connected with the chord of the fixed blade 1. The included angle θ of the link 2 is 60°-70°. The size of the θ angle affects the size and ratio of the drag and lift effects. The selection in actual application should be selected according to the local wind conditions. Usually, the annual average wind force When the level is less than 3 and more than 60 days, the θ angle should be larger or close to the upper limit.

The above-mentioned wind wheel 1 can be an even number of wind blades and is fixed on the wind wheel rotating shaft 3 according to the axial symmetry by means of the connecting rod 2 .

The above-mentioned thin plate for making the fan blade may be metal or plastic, and the fan blade 1 is an integral structure, which can be made at one time by injection molding or stamping process. The process should ensure that the fan blades are firmly fixed on the connecting rod, and because the fan blades are a complete integral structure, the stability and strength of the fan blades themselves are high.

As shown in Figure 1, when the lower surface A of the airfoil of the blade faces the wind, its wind resistance is the largest and the force is the largest, while the streamline shape of the other blade in a symmetrical position faces the wind with the least resistance, so the rotation axis of the wind wheel 3 It can generate a large driving moment, and when the angle of attack gradually increases from 0°, the lift moment generated by the airfoil blades gradually increases, and the maximum lift moment is generated when the angle of attack reaches 20°. The synergistic effect of the two , which is the combined effect of drag and lift.

The wind speed of the utility model constructed thus can be started at a low wind speed of 3 meters per second. After start-up, the resistance and lift superimpose to drive the wind wheel together. When the linear speed of the blade is close to the rated cut-out wind speed, the reverse resistance generated by the blade is proportional to the square of the relative wind speed of the blade, so it has the function of automatic limiting. It is unnecessary to set up a special speed-limiting device again because of the speed effect.

Claims (3)

1, a kind of drag and lift composite wind power device, it is characterized in that wind turbine wing airfoil blade (1) is the special-shaped structure body of the concave curved surface that a thin plate is made, the airfoil of hollow airfoil blade (1) The lower surface is blank, and a plurality of fan blades (1) are fixed on the rotating shaft of the wind wheel (3) in the axial direction by means of the connecting rod (2), and the lower surface (A) of the airfoil of the fan blade (1) faces outward , the included angle between the chord of each airfoil blade (1) and the connecting rod (2) of the blade is 60°-70°. 2. The combined resistance and lift wind power device according to claim 1, characterized in that the blades (1) of an even number are fixed axially symmetrically on the rotating shaft of the wind wheel by means of connecting rods (2). (3). 3. The drag and lift compound wind power device according to claim 1 or 2, characterized in that the blade (1) is an integral structure.

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