CN107013412B - A small vertical axis wind power generator with blades driven and its power generation method - Google Patents

Abstract

The invention discloses a small vertical axis wind turbine driving blades and a power generation method thereof. The resistance of the blades greatly reduces the efficiency of the wind power generator. Two spokes on the same side of the invention are respectively fixed with two ends of a blade mounting shaft, and the blade mounting shaft and the blade form a revolute pair; the axis of the blade mounting shaft divides the blade into two parts with unequal chord lengths; the inner sides of the two blade mounting shafts are respectively fixed with a baffle rod; the baffle rod comprises a first cross rod, a vertical rod, a second cross rod and a baffle ring; the baffle ring is fixed at the bottom end of the second cross rod; the included angles between the second cross rod and the spoke are 5-10 degrees, and the baffle rings of the two baffle rods face opposite directions; the upper hub is supported on the rotor of the generator and is connected to the rotor of the generator by a clutch. According to the invention, the blades are divided into unequal parts by the blade mounting shaft so as to force the blades to deflect, the stop lever controls the deflection angle of the blades to achieve the optimal windward area, and the efficiency of the generator is improved.

Description

A small vertical axis wind power generator with blades driven and its power generation method

technical field

The invention relates to a wind power generator, in particular to a small vertical axis wind power generator driving blades and a power generation method thereof.

Background technique

There are two main types of wind turbines, horizontal axis and vertical axis. Horizontal axis wind turbines are suitable for outdoor wind farms where the wind direction and speed are relatively stable, and are not suitable for installation in cities where the wind speed and direction change relatively frequently, while vertical axis wind turbines, especially H-type vertical axis wind turbines, can be very good. Adapt to the characteristics of urban wind conditions. Vertical axis wind turbines are off-grid wind power generation equipment, which are mainly used in small-scale power consumption places such as urban street lights, LED display boards, and remote mountainous users without electricity. Traditional H-type generators mainly improve power generation efficiency from the aspects of blade shape and stability. Usually, the generator is installed on the top of the column, and the horizontally rotating impeller is installed on the rotor shaft of the generator. The impeller is connected with the rotor shaft of the generator above the generator, and the impeller drives the generator under the action of wind. The rotation of the rotor generates electricity. But the drag of the blades under normal conditions greatly reduces the efficiency of wind turbines.

Contents of the invention

The object of the present invention is to address the deficiencies of the prior art, and provide a small vertical axis wind power generator with blades and its power generation method with simple structure, good flexibility, safety and reliability, small vibration, low starting wind speed and high power generation efficiency.

In order to achieve the above-mentioned purpose of the invention, the technical solution of the present invention is realized in the following manner:

The present invention is a small vertical axis wind power generator that drives the blades, comprising generators, blades, impeller hubs, baffle rods and blade installation shafts; the impeller hubs include upper hubs, spokes, lower hubs and connecting rods; The connecting rod connects the upper hub and the lower hub into one body. Two spokes are symmetrically fixed on the upper hub and the lower hub. The root blade installation shaft and a blade form a rotating pair; the blade installation shaft axis divides the blade into two parts with unequal chord length; the inner sides of the two blade installation shafts are all fixed gear rods; the gear rod includes the first Crossbar, vertical rod, second crossbar and retaining ring; the first crossbar is fixed to the blade installation shaft, the vertical rod is connected to the first crossbar and the second crossbar, and the retaining ring is fixed at the bottom end of the second crossbar; the retaining ring The inner concave surface of the ring is in contact with the outer convex surface of the larger part of the chord length of the blade, or the outer convex surface of the retaining ring is in contact with the outer convex surface of the smaller part of the blade chord length; the angle between the second crossbar and the spoke is 5-10°, and The retaining rings of the two gear rods are facing oppositely; the lower hub is fixed to the top end of the thrust bearing, and the bottom end of the thrust bearing is fixed to the column; the upper hub is supported on the rotor of the generator through a ball bearing; one end of the clutch is fixed on On the upper hub, the other end is fixed to the rotor of the generator; the base of the generator is connected to the top of the column through the upper flange.

The blade installation axis divides the blade into two parts with a chord ratio of 1:2.

Both the inner concave surface and the outer concave surface of the retaining ring are provided with elastic pieces.

The bottom of the column is provided with a lower flange.

A braking device is arranged between the column and the lower hub.

The power generation method of the small vertical axis wind power generator driving the blades is as follows:

When the wind force acts on the blade, since the installation axis of the blade is not at the center of the blade, the larger part of the chord of the blade will be deflected due to the greater force. The rod prevents the reduction of the windward surface, and at the same time, the resistance surface of the other blade reaches the equilibrium position when the effective area on the plane perpendicular to the wind direction is the smallest due to the wind force, reducing the resistance, so that the two asymmetrical blades drive the impeller hub to rotate , when the rotation speed of the impeller hub reaches the preset value, the clutch is combined, thereby driving the rotor of the generator to rotate and generate electricity.

The invention utilizes the characteristics of wind force acting on the area of the blades to affect the loss of resistance and the unbalanced force, divides the blades into unequal parts through the blade installation shaft and then forces the blades to deflect, and controls the deflection angle of the blades under the auxiliary action of the blocking rod. Achieve the best windward area, reduce drag loss, and improve the efficiency of the generator. The rotation of the moving blade can continuously adapt to the wind direction, which is universal in actual working conditions. Because it is a small vertical axis wind turbine, it has a simple structure, low cost, convenient installation and maintenance, urban street lights, LED display screens, and remote areas are universal and easy to promote.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of the two blades swinging against the wind to a stable state in the present invention.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing.

As shown in Fig. 1 and Fig. 2, a kind of small-sized vertical axis wind power generator that drives blade, comprises generator 4, blade 11, impeller hub, stop bar 15 and blade installation shaft 16; Impeller hub includes upper hub 1, spoke 14 , the lower hub 7 and the connecting rod 12; the connecting rod 12 connects the upper hub 1 and the lower hub 7 into one, the upper hub 1 and the lower hub 7 are symmetrically fixed with two spokes 14, and the upper hub 1 and the lower hub 7 are on the same side The two spokes of the wheel and the two ends of a blade installation shaft 16 are respectively fixed, and each blade installation shaft 16 and a blade 11 form a revolving pair; part; the inside of the two blade installation shafts 16 is fixed with a gear bar 15; the gear bar includes a first cross bar, a vertical bar, a second cross bar and a retaining ring; the first cross bar is fixed with the blade installation shaft 16, and the vertical bar is connected The first crossbar and the second crossbar, the stop ring is fixed at the bottom of the second crossbar; when the blade rotates to a stable state, the inner concave surface of the stop ring contacts the outer convex surface of the larger part of the chord length of the blade, or the outer convex surface of the stop ring The convex surface is in contact with the convex surface of the smaller part of the chord length of the blade; the included angle between the second crossbar and the spoke is 5-10°, and the retaining rings of the two retaining rods are facing oppositely; the retaining rod is installed on the blade installation shaft for Control the swinging range of the blade and maintain it at a suitable angle; elastic parts are provided on the inner concave surface and outer concave surface of the retaining ring to buffer the impact force of the blade and the retaining rod; the lower hub 7 is fixed to the top of the thrust bearing 8, and the thrust bearing 8 The bottom end of the vertical column 6 is fixed on the column 6; the bottom end of the column 6 is provided with a lower flange 10; the upper hub 1 is supported on the rotor 3 of the generator 4 through a ball bearing 13; one end of the clutch 2 is fixed on the upper hub 1, and the other end It is fixed with the rotor 3 of the generator; the base of the generator 4 is connected with the top of the column 6 through the upper flange 5 to form the static part of the small vertical axis wind turbine; the blade 11, the blade installation shaft 16, the impeller hub, the clutch 2 and the generator The rotor 3 of the machine 4 forms the rotating part of the small vertical axis wind power generator. The blade 11 and the impeller hub start to rotate under the action of wind force. When the speed of the impeller hub reaches the rated value, the clutch 2 is combined, and the rotor 3 of the generator is together with the impeller hub. Rotate, generator 4 starts to generate electricity, and brake device 9 is set between column 6 and lower hub 7, and when impeller hub speed exceeds set value, brake device 9 braking function starts, and reduces speed to ensure safety. The installation position of the blade and the axial center position of the blade installation shaft can be installed according to the actual situation, and the position of the stop rod is determined according to the blade installation shaft and the swing angle of the blade.

The power generation method of the small vertical axis wind power generator driving the blades is as follows:

When the wind force acts on the blade, since the installation axis of the blade is not at the center of the blade, the larger part of the chord of the blade will be deflected due to the greater force. The bar prevents the reduction of the windward surface, and at the same time, the resistance surface of the other blade reaches the equilibrium position when the effective area on the plane perpendicular to the wind direction is the smallest due to the wind force, reducing the resistance, so that the two blades 11 with asymmetric positions drive the impeller hub Rotate, when the rotation speed of the impeller hub reaches a preset value (which can be set according to the rated power of the generator), the clutch 2 is combined, thereby driving the rotor 3 of the generator 4 to rotate and generate electricity. The asymmetrical position of the two blades 11 and the curvature of the blades can more effectively convert wind energy into the kinetic energy of blade rotation, and the curvature can minimize the effective projected area of the resistance surface, thereby improving power generation efficiency.

Claims (6)

1. A small vertical axis wind turbine driving blades comprises a generator, blades, an impeller hub, a stop lever and a blade mounting shaft; the method is characterized in that: the impeller hub comprises an upper hub, spokes, a lower hub and a connecting rod; the upper hub and the lower hub are connected into a whole through the connecting rod, two spokes are symmetrically fixed on the upper hub and the lower hub, two spokes on the same side of the upper hub and the lower hub are respectively fixed with two ends of a blade mounting shaft, and each blade mounting shaft and one blade form a revolute pair; the axis of the blade mounting shaft divides the blade into two parts with unequal chord lengths; the inner sides of the two blade mounting shafts are respectively fixed with a baffle rod; the baffle rod comprises a first cross rod, a vertical rod, a second cross rod and a baffle ring; the first cross rod is fixed with the blade mounting shaft, the vertical rod is connected with the first cross rod and the second cross rod, and the baffle ring is fixed at the bottom end of the second cross rod; the inner concave surface of the baffle ring is contacted with the outer convex surface of the part with the larger chord length of the blade, or the outer convex surface of the baffle ring is contacted with the outer convex surface of the part with the smaller chord length of the blade; the included angles between the second cross rod and the spoke are 5-10 degrees, and the baffle rings of the two baffle rods face opposite directions; the lower hub is fixed with the top end of the thrust bearing, and the bottom end of the thrust bearing is fixed on the upright post; the upper hub is supported on the rotor of the generator through a ball bearing; one end of the clutch is fixed on the upper hub, and the other end of the clutch is fixed with a rotor of the generator; the base of the generator is connected with the top end of the upright post through an upper flange to form a static part of the small vertical axis wind turbine; the blades, the blade mounting shaft, the impeller hub, the clutch and the rotor of the generator form a rotating part of the small vertical axis wind driven generator, the blades and the impeller hub start to rotate under the action of wind force, the clutch is combined after the rotating speed of the impeller hub reaches a rated value, the rotor of the generator rotates along with the impeller hub, and the generator starts to generate electricity.

2. A small vertical axis wind turbine with blades as claimed in claim 1 wherein: the axis of the blade mounting shaft divides the blade into the chord length ratio of 1: 2.

3. A small vertical axis wind turbine with blades as claimed in claim 1 wherein: elastic pieces are arranged on the inner concave surface and the outer concave surface of the baffle ring.

4. A small vertical axis wind turbine with blades as claimed in claim 1 wherein: the bottom end of the upright post is provided with a lower flange.

5. A small vertical axis wind turbine with blades as claimed in claim 1 wherein: and a brake device is arranged between the upright post and the lower hub.

6. The method for generating power by a small vertical axis wind turbine with blades according to claim 1, wherein: the method comprises the following steps:

when wind force acts on the blades, because the blade mounting shaft is not positioned at the center of the blades, the larger chord length part of the blades can deflect due to larger force, at the moment, the larger chord length part of one blade is supported by the stop lever, the stop lever prevents the windward side from decreasing, and meanwhile, the other blade reaches the balance position when the effective area on the plane vertical to the wind direction is minimum due to the fact that the resistance surface is under the action of wind force, resistance is reduced, two blades with asymmetric positions drive the impeller hub to rotate, and when the rotation speed of the impeller hub reaches a preset value, the clutch is combined, so that the rotor of the generator is driven to rotate to generate electricity.