CN104295442A - Dual-wind-wheel horizontal-axis wind turbine - Google Patents

Abstract

The invention belongs to the technical field of wind power generation, and specifically discloses a horizontal axis wind power generator with double wind rotors, which is characterized in that the two wind rotors are staggered and distributed on both sides of the rotating shaft, and the rotation plane is parallel to the wind direction. The blade is formed by improving the traditional airfoil. When the leading edge moves against the wind, it has high lift characteristics. When moving downwind, the cavity of the trailing edge has the characteristics of a drag blade. The entire wind wheel rotor is adjusted by the tail mark to achieve the effect of automatically facing the wind. The invention has the advantages of simple structure, lower wind thrust in the downwind direction, and high utilization rate of wind energy.

Description

A double-wind-wheel horizontal-axis wind generator

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Technical field:

The invention relates to the field of wind power generation, and discloses a horizontal-axis wind-driven generator with double wind rotors, specifically a novel wind-driven generator in which the rotors of two horizontal-axis wind turbines are adjusted to a position parallel to the wind direction and lift-drag complementary blades are introduced.

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Background technique:

The cleanliness and renewability of wind energy and the increasing maturity of its large-scale application technology have made wind power generation increasingly become the clean power generation method with the most mature technology, the most development conditions and the most development prospects in the field of new energy besides nuclear power. At present, countries have regarded wind energy development as one of the most important components of new energy strategies.

Modern wind turbines are divided into two categories: vertical axis wind turbines and horizontal axis wind turbines according to the topological geometric relationship between the rotor shaft and the ground. In the vertical axis wind turbine, due to the diversity of operation mode and structural form, it is divided into two types: drag type and lift type. Based on the characteristics of drag-type and lift-type wind turbines, many scholars have proposed to combine the two types of wind rotors into a lift-drag complementary wind rotor, which can use the better start-up performance of drag-type wind turbines in the static state, but at high blade tip speed ratio The wind turbine without losing the lift has excellent utilization rate of wind energy.

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Invention content:

In order to overcome the above-mentioned defects, the object of the present invention is to provide a horizontal axis wind power generator with double wind rotors, so that the wind rotors can make full use of the wind speed distribution in a plane parallel to the wind direction, exert the lift-drag complementary ability of the airfoil, and improve the utilization rate of wind energy .

The present invention adopts following technical scheme for realizing above-mentioned purpose of the invention:

A horizontal-axis wind power generator with double wind rotors, including two lift-drag complementary wind rotors, a rotating shaft connected horizontally to the two wind rotors, the rotating shaft is connected to a rotatable hub, and is characterized in that the rotation plane of the wind rotors is parallel to the wind direction .

Further, the downwind direction of the hub is rigidly fixed to the tail mark, and the length L of the connecting rod in the tail mark is greater than the rotation radius r of the wind rotor, that is, the tail mark is made of carbon fiber composite material. The vertical tail (6) can adjust the windward surface of the rotating wind rotor, so that the rotation plane of the wind rotor is always parallel to the incoming wind direction.

The hub is arranged on the top of the tower, and a transmission device is installed in the tower, and the transmission device transmits the torque of the wind wheel to the generator in the base.

The wind rotor blade is based on the aviation airfoil RAF89, and the lower half of the airfoil is cut to form an unclosed thin-walled shell structure; the chord length of the blade gradually decreases from the root to the tip. Cutting the lower half of the airfoil refers to excavating part of the material at the thicker part of the blade's airfoil so that the blade as a whole shows a bent structure, that is, a groove is formed. The blade maintains good airfoil aerodynamic characteristics while having drag-type blade performance.

Furthermore, each wind rotor is composed of 3 blades; the blades are inclined outward by 10-15° (referring to the angle formed by the blade and the rotation plane of the wind rotor), and misaligned by 60° (referring to the blades of the two wind rotors). The angle of mutual dislocation) is distributed on both sides of the rotating shaft and rigidly connected with the rotating shaft.

The rotating shaft runs through the flexibly rotatable hub, and the built-in steering gear in the hub transmits the torque of the rotating shaft to the vertical rotating shaft in the tower; the hub rotates on the top of the tower through bearings. The wind rotor blades are made of hard stainless steel, the wall thickness of the fan blade shell is 3-4mm, and the blade tips are not closed. The generator is buried in the base, and receives the vertical shaft in the tower to transmit torque. The hub is made of stainless steel, which can closely fit the gear set and play the role of dustproof and rainproof.

The horizontal rotating shafts connecting the two wind wheels are nested into the flexibly rotatable hub. The rotating shaft transmits the torque of the wind rotor to the vertical rotating shaft in the tower through the gear set, and then to the generator buried in the base.

The beneficial effects of the present invention are:

In the present invention, when the blade runs along the wind, the groove of the blade is driven by the wind to drive the wind wheel to rotate. At the same time, when the blade runs against the wind, the airfoil characteristics of the blade generate enough lift to continue to increase the rotor torque, greatly improving the wind energy utilization rate of the wind rotor. The hub design of the rotating shaft can effectively reduce the wear of the wind wheel and improve the service life of the whole machine.

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Description of drawings:

Fig. 1 is a side view of a horizontal axis wind turbine with double wind rotors;

Fig. 2 is a front view of a horizontal-axis wind turbine with double wind rotors;

Fig. 3 is a schematic diagram of the wind direction when a horizontal-axis wind turbine with double wind rotors is working;

Fig. 4 is a blade effect diagram of a horizontal-axis wind turbine with double wind rotors;

Fig. 5 is a comparison chart of the lift coefficient between the selected airfoil and the original airfoil for a horizontal axis wind turbine with double wind rotors;

Fig. 6 is a schematic diagram of transmission of a horizontal shaft and a vertical shaft of a double-wind-wheel horizontal-axis wind turbine.

Detailed ways

The specific embodiment of the present invention will be further described below in conjunction with the accompanying drawings.

The traditional aviation airfoil RAF 89 is selected, and the lower half of the airfoil is cut at the maximum thickness to form an unclosed shell structure. At the same angle of attack and incoming wind speed, its lift coefficient is compared with that of the RAF 89 airfoil. Figure 5. Wind turbine blade 1 is designed with the modified airfoil as the prototype, the chord length of the blade section decreases from the root, and the thickness of the airfoil at the root of the blade is enlarged, as shown in Figure 4. Blade 1 is made of high-strength carbon fiber material.

Take three blades 1 as a group, and form an included angle of 10°-15° between the blade and the rotation plane to reduce the influence of the blade tip wake, as shown in Fig. 1 and Fig. 2 . Two wind wheels are arranged at both ends of the horizontal rotating shaft 2 and fixed at 60° staggered.

The horizontal rotating shaft 2 is nested in the hub 5 . The torque of the horizontal shaft 2 is transmitted to the vertical shaft in the sleeve 3 through the steering gear set, as shown in Figure 6, the hub 5 is made of stainless steel, which can prevent dust and rain.

The hub 5 can drive the horizontal shaft 2 to rotate flexibly at the top of the tower tube 3 . Its rotation angle is automatically adjusted by the tail mark 6 according to the wind direction, as shown in Fig. 3 .

The generator is pre-buried in the base 4, and the rotor of the generator is connected with the inner rotating shaft of the tower 3, which can effectively convert the torque of the wind rotor into electric energy.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the above-mentioned embodiments do not limit the present invention in any form, and all technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (9)

1. a two wind wheel horizontal axis wind-driven generator, comprise two lift-drag complementary wind wheels, with two wind wheel rotating shafts connected horizontally (2), rotating shaft is connected with rotating wheel hub (5), it is characterized in that, wind wheel plane of rotation is parallel with wind direction.

2. the two wind wheel horizontal axis wind-driven generator of the one according to claims 1, it is characterized in that: under wheel hub (5), wind direction rigidly fixes tuning tail tag (6), in tail tag (6), connecting rod length L is greater than wind wheel turning radius r, namely; Tail tag is made up of carbon fiber composite.

3. the two wind wheel horizontal axis wind-driven generator of one according to claim 1, it is characterized in that, described wheel hub is arranged on tower cylinder (3) top, and install transmission device in tower cylinder (3), wind wheel torque reaches in the generator in base (4) by transmission device.

4. the two wind wheel horizontal axis wind-driven generator of the one according to claims 1 or 2 or 3, it is characterized in that: wind wheel blade (1) with aviation aerofoil profile RAF89 for prototype, second aerofoil of aerofoil profile is cut, forms the thin-wall case structure do not closed; Blade (1) chord length reduces from root gradually to blade tip.

5. the two wind wheel horizontal axis wind-driven generator of one according to claim 3, is characterized in that, refers to the portion of material of blade airfoil to excavate to make blade integral be shown as bending structure to second aerofoil cutting of aerofoil profile.

6. the two wind wheel horizontal axis wind-driven generator of the one according to claims 1, is characterized in that: every wind wheel has 3 blade (1) compositions; The angle that blade (1) and wind wheel plane of rotation are formed is 10 ~ 15 °, and two wind wheels, the 60 ° of degree that misplace are distributed in rotating shaft (2) both sides, are rigidly connected with rotating shaft (2).

7. the two wind wheel horizontal axis wind-driven generator of the one according to claims 1, it is characterized in that: rotating shaft (2) is through in wheel hub (5), the built-in tuning gear of wheel hub (5), by rotating shaft vertical in rotating shaft transmission of torque to tower cylinder (3); Wheel hub (5) is rotated by bearing at tower cylinder (3) top.

8. the two wind wheel horizontal axis wind-driven generator of the one according to claims 1-7 any one, it is characterized in that: wind wheel blade (1) is made up of hard stainless steel, shell wall is thick is 3-4mm, and blade tip is not closed.

9. the two wind wheel horizontal axis wind-driven generator of the one according to claims 1, is characterized in that: generator is imbedded in base (4), accepts vertical rotating shaft transmitting torque in tower cylinder (3).