CN101446265A - Refraction wind-guiding type fan blade system - Google Patents

Abstract

The invention relates to a refraction wind guide type fan blade system in the technical field of wind power generation, comprising a fan blade frame, a fan blade body, a fixed bracket, a connecting piece between a fan blade and a shaft, a refraction wind guide plate, a fan blade frame and a fan blade The steel mesh inside the body is welded together to form the overall fan blade. The refraction wind deflector is fixed at an angle of 60 degrees to the fan blade frame. The lower end of the refraction wind deflector is fixed on the fan blade frame. The end holes are fixed with screws, the fan blades are connected and fixed on the connection flange of the crankshaft through the fan blades and shaft connectors, and the refraction wind guide plate is connected with the fan blades through a fixing bracket. The invention makes the fan blade rotate to any position and angle, so that the fan blade can obtain the largest wind-receiving area, and the wind force can be refracted to the point of the largest rotational moment to generate the largest driving moment. The fan blade rotates in the horizontal direction, and the three The wind blades complement each other to produce a balanced rotational moment, without starting dead angle and reversing dead angle, resulting in the best dynamic balance characteristics and stable rotation.

Description

Refractive wind guide fan blade system

technical field

The invention relates to a fan blade in the technical field of wind power generation, in particular to a refraction wind guiding type fan blade system.

Background technique

With the development of the world's energy crisis, the use of wind kinetic energy as a new energy source for the development of modern society has become a hot spot in social development. The traditional propeller wind blade is too long, bulky, low utilization rate, difficult to manufacture, and seriously increases the difficulty of transportation, installation and maintenance. The blades of the existing vertical shaft wind power generators have large starting dead angles and large reversing dead angles during the starting and rotating motions. The existing airfoil blades have a small wind receiving area and low wind utilization rate. There is a commutation dead angle during the movement, which makes it difficult to increase the capacity.

According to the literature search of the prior art, it is found that the fan blades in the generator set of the Chinese patent ZL200430067146.5 have low utilization rate of wind power, and there are problems of large starting dead angle and reversing dead angle during starting and rotating motion.

During the search, it was also found that the fan blade of the wind power generator with the patent application number 200410023530.4 adopts the NACA0009 airfoil. Dead angle, difficult to increase capacity.

Contents of the invention

Aiming at the deficiencies in the prior art, the present invention provides a refraction wind guide type fan blade system, the wind force of the fan blade directly drives the fan blade to rotate, the wind receiving area is large, the utilization rate of wind force is high, and the wind rays pass through the refraction guide plate to make it At any angle, it can be refracted to the wind blade surface at the end of the maximum torque, and make the wind force rays perpendicular to the outer cut surface of the wind blade surface, generate the maximum thrust and the maximum rotational moment, and push the wind blade to rotate in the horizontal direction. The fan blade rotates in the horizontal direction, has good balance characteristics, high speed, good stability, and is easy to install and debug. The fan blade is combined with the refraction guide plate, so that the fan blade rotates to any position and angle, and the wind force can pass through the refraction guide plate, so that the resultant moment of the wind force line is concentrated at the focus of the largest tangent plane perpendicular to the wind blade surface , so that the wind force is refracted to the point of maximum rotational moment. Generate the maximum driving torque to make the fan blade rotate in the horizontal direction. The angles of the three fan blades of the present invention are 120 degrees different, and the three fan blades complement each other to generate a balanced rotational moment, without starting dead angle and reversing dead angle, resulting in the best dynamic balance characteristics and stable rotation.

The present invention is realized through the following technical proposals. The present invention includes a fan blade frame, a fan blade body, a refraction wind deflector, a fixing bracket, and a connecting piece between the fan blade and the shaft. The fan blade frame and the inner steel mesh of the fan blade body are welded together to form a whole fan blade. The fan blade refracts the wind deflector and the fan blade frame, and is fixed at an angle of 60 degrees. The lower end of the refraction air deflector is fixed on the blade frame by screws, and the fixing hole in the middle of the refraction air deflector and the end hole of the fixing bracket are fixed by screws. The fan blade is connected and fixed on the connecting flange of the crankshaft through the fan blade and the shaft connecting piece. The refraction wind deflector is connected with the fan blade through a fixed bracket, which is convenient for assembly, maintenance and transportation.

The fan blade frame is made of angle steel into a cuboid, and the material is a steel structure to increase the strength of the fan blade.

The fan blade body is made of steel strips (or steel wires) inside the blade surface mesh skeleton, and polyester resin (glass fiber reinforced plastic) is attached on the surface. The surface is smooth and the wind resistance is small. The main function of the fan blade is to receive the wind, and the wind blows on the fan blade to generate the maximum rotational moment. The cross section of the fan blade is a streamlined curve of the wing, the front of the fan blade has a large wind receiving area, and the wind resistance behind the fan blade is small. The longitudinal section is a protruding arched curve. When the wind pushes the blades to rotate, the movement trajectory of the wind force line is straight, no eddy current is generated, and the movement trajectory of the wind force ray is in the best state.

There are three wind blades, and each of the three wind blades has an angle of 120 degrees.

The wind-guiding refraction guide plate is framed by the wind-guiding plate, with steel mesh inside and polyester resin (glass fiber reinforced plastic) on the surface, with smooth surface and small wind resistance.

The fixing bracket is made of long flat steel with fixing holes at both ends.

There are fixing holes at both ends and in the middle of the connecting piece between the fan blade and the shaft.

The connecting piece between the shaft and the fan blade is the most critical force bearing point, which not only bears the weight of the fan blade, but also bears the rotational moment generated by the fan blade. The cross-section of the piece is the largest, the end bearing force is small, and the cross-section is also small.

The invention utilizes the principle of wind collection and wind force guidance. At any angle, the wind force line passes through the wind force refraction guide plate, so that the wind force line and the wind blade surface form a right angle. The largest, the wind blade has the largest wind receiving area, the highest effective utilization rate of wind force, and the generated thrust is the largest. The fan blade of the invention has small radius, high rotation speed, high wind power utilization rate and good balance, and can be used as a driving power machine for high-power power machines and wind power generators.

In the fan blade structure proposed by the present invention, the fan blade is combined with the refraction guide plate, so that the fan blade can be rotated to any position and angle, so that the fan blade can obtain the largest wind receiving area, and through the refraction guide plate, the direction of the wind force line The resultant moment concentrates on the point where the maximum point is perpendicular to the focus of the tangent plane to the wind blade surface, so that the wind force is refracted to the point of the maximum rotational moment, and the maximum driving torque is generated, and the wind blade rotates in the horizontal direction. The three fan blades of this system have a difference of 120 degrees, and the three fan blades complement each other to generate a balanced rotational moment, without starting dead angle and reversing dead angle, resulting in the best dynamic balance characteristics and stable rotation.

Description of drawings

Fig. 1 is the three-dimensional structural diagram of the present invention

Fig. 2 is a side view of the fan blade of the present invention

Figure 3 is a lateral view of the fan blade of the present invention

Figures 4-1 to 4-4 are the principle diagrams of the wind refraction guide of the fan blade of the present invention

In the figure: 1 is the fan blade frame, 2 is the blade body of the fan blade, 3 is the wind guide refraction guide plate, 4 is the fixed bracket, and 5 is the connecting piece between the fan blade and the shaft.

Detailed ways

The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

As shown in FIG. 1 , this embodiment includes a fan blade frame 1 , a fan blade body 2 , a refraction wind deflector 3 , a fixing bracket 4 , and a connecting piece 5 between the fan blade and the shaft. The fan blade frame 1 is welded together with the internal steel mesh of the fan blade body 2 to form an integral fan blade. The refraction wind deflector 3 is fixed at an angle of 60 degrees to the blade frame 1 . The lower end of the refraction wind deflector 3 is fixed on the fan blade frame 1 by screws, and the fixing hole in the middle of the refraction wind deflector 3 and the end hole of the fixing bracket 4 are fixed by screws. The fan blade is connected and fixed on the connecting flange of the crankshaft through the fan blade and the shaft connector 5 . The refraction wind deflector 3 is connected with the fan blade through a fixing bracket 4 .

In this example:

The fan blade frame 1 is made of angle steel and is made into a rectangular frame body, which is mainly used as a support carrier for the fan blade, and has high strength, which increases the torsion-resistant moment and the anti-gravity moment of the fan blade. The blade frame is made of S45C steel.

The main function of the wind blade is to receive the wind, and the wind blows on the wind blade to generate the maximum rotational moment. As shown in Fig. 3, the wind blade is in the form of a protruding arched curve in longitudinal view. Seen from the side, as shown in Figure 2, it is a streamlined curved surface. When the wind pushes the fan blades to rotate, the wind force line is in a straight line without eddy currents, and the wind force ray movement track is in the best state.

There are three wind blades, and the angles between the three wind blades are 120 degrees.

As shown in Figure 2, the blade refraction guide plate 3 is in the shape of a flat plate, and is fixed on the blade at an angle of 60 degrees to the blade, as shown in Figure 4-1 to Figure 4-4, the system blade and refract The guide plates 3 are combined, and by refracting the guide plates 3, the resultant moment of the wind force line is concentrated to point to the focal point A of the vertical tangent plane of the wind blade surface, so that the wind force is refracted to the point of the maximum rotational moment, and the maximum driving torque is generated to push the wind. The leaves rotate horizontally.

The above-mentioned fixing bracket is in the form of a strip-shaped bracket, one end of which is fixed on the fan blade, and the other end is fixed on the refraction wind deflector, so that the fan blade frame and the refraction wind deflector form an angle of 60 degrees. The fixed bracket is made of S45C steel.

There are fixing holes at both ends and in the middle of the connecting piece between the fan blade and the shaft.

The connecting piece between the fan blade and the shaft, because the connecting piece between the shaft and the fan blade, is the most critical force bearing point, which not only bears the weight of the fan blade, but also bears the rotational moment generated by the fan blade. The joint of the fan blade has the largest bearing force, and the cross section of the connecting piece is the largest, while the end bears the least force and the cross section is also small. The connecting piece 5 between the fan blade and the shaft is made of S45C steel.

In the present embodiment, the wind blade is an involute streamlined curved surface, and the wind blade is equipped with a refraction wind deflector 3, and the wind is refracted by the refraction wind deflector 3, and blows to the wind blade surface, so that the wind force line and the blade surface are aligned. Directly shoot vertically, so that the direct wind pushes the fan blades to rotate in the horizontal direction, the generated thrust is the largest, and the largest rotational driving torque is generated to push the fan blades to rotate. The wind pushes the fan blades to rotate, and the wind blows to the rotating streamlined blade surface, and slides from the rotation axis to the end of the fan blade along the direction of centrifugal force. Create a vortex.

As shown in Figure 4-1 to Figure 4-4. When the wind blade turns to any position, the wind passes through the refraction wind deflector 3, and the resultant force of the wind force points to the maximum torque point of the wind blade rotation, pushing the wind blade to generate the maximum rotational moment.

When the wind blade turns to form an angle of 60 degrees with the wind ray, as shown in Figure 4-1, the wind blows on the refraction wind deflector 3, and the wind ray is refracted to the right, and together with the positive wind ray on the right, and Moment, so that the wind rays converge to point A of the fan blade to generate the maximum rotational driving moment.

When the wind blade turns to the angle shown in Figure 4-2, the wind blade is perpendicular to the wind ray, and the air volume received by the wind blade is the largest. When the wind blows on the refraction wind deflector 3, the wind ray is refracted to the right, and the normal The wind force rays jointly generate sum torque, so that the wind force rays converge to point A of the wind blade to generate the maximum rotational driving moment.

When the wind blade turns to form an angle of 120 degrees with the wind ray, when the wind blade turns to the angle shown in Figure 4-3, the wind blows on the refraction wind deflector 3, and the wind ray is refracted to the left, which is in the same direction as the left side. The wind force rays jointly generate sum torque, so that the wind force rays converge to point A of the wind blade to generate the maximum rotational driving moment.

When the wind blade turns to the position shown in Figure 4-4, the wind blade and the wind ray are in the same direction, the wind blows onto the refraction wind deflector 3, and the wind ray is refracted to the left, so that the wind ray converges to point A of the wind blade. Generates a rotational propulsion torque. However, the wind blades of the patent ZL200430067146.5 generator, the wind blades of the NACA0009 airfoil wind generator adopted in the patent application number 200410023530.4, and the traditional wind blades do not produce rotational driving torque in such states. However, the fan blade in this embodiment can still generate a large rotational moment to push the fan blade to rotate.

The fan blade shape structure adopted by the system of this embodiment has a large wind-receiving area and does not generate eddy currents. After adding the refraction wind deflector 3, the rotational dynamic moment generated is more than three times that of the current types of fan blades. After a large number of simulation experiments and a large number of calculations, the fan blade system is suitable for the needs of wind power generation systems of 1KW to 6 MW or more.

Claims (9)

1. A refraction wind guide type fan blade system, including a fan blade frame, a fan blade body, a fixed bracket, a fan blade and a shaft connector, and is characterized in that it also includes a refraction wind guide plate, wherein: the fan blade frame and the fan blade The steel mesh inside the blade body is welded together to form the overall fan blade. The refraction wind deflector is fixed at an angle of 60 degrees to the fan blade frame. The lower end of the refraction wind deflector is fixed on the fan blade frame. The holes at the end of the bracket are fixed with screws, the fan blades are connected and fixed on the connecting flange of the crankshaft through the fan blades and shaft connectors, and the refraction wind guide plate is connected with the fan blades through the fixing bracket. 2. The refraction-guided fan blade system according to claim 1, wherein there are three said fan blades, and the angles of the three fan blades are 120 degrees apart. 3. The refracting wind-guiding fan blade system according to claim 1 or 2, characterized in that the cross section of the fan blade is a streamlined curve of the wing, and the longitudinal section is a protruding arched curve. 4. The refraction-guiding fan blade system according to claim 1, wherein the fan blade frame is a cuboid, and the material is a steel structure. 5. The refracting wind-guiding fan blade system according to claim 1, characterized in that, the fan blade body has a blade mesh skeleton inside the blade surface, and polyester resin or fiberglass is attached to the surface. 6. The refraction-guiding fan blade system according to claim 1, characterized in that, the wind-guiding refraction guide plate comprises a wind deflector frame and its internal steel mesh, and polyester resin is attached to the surface of the wind-guidance refraction guide plate or FRP. 7. The refraction wind guide type fan blade system according to claim 1 or 6, characterized in that, the refraction wind guide plate is in the shape of a flat plate. 8. The refraction-guiding fan blade system according to claim 1, wherein there are fixing holes at both ends of the fixing bracket. 9. The refraction-guiding fan blade system according to claim 1, characterized in that there are fixing holes at both ends and in the middle of the connecting piece between the fan blade and the shaft.

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