CN102493914B - Auxiliary fan of lift-type vertical axis wind generator - Google Patents

Abstract

The invention designs an auxiliary fan for a lift type vertical axis wind power generator. It includes a rotating shaft, a pair of wind wheels and two connecting brackets, the rotating shaft is a T-shaped rotating shaft coaxially connected with the main shaft of the lift-type vertical axis wind turbine; the connecting bracket has a turning angle of 120°± A 20° turning rod, one of its long ends is connected to the wind wheel, and one of its short ends is connected to a counterweight steel ball. The ends are hinged so that the two wind wheels form a wind wheel with a variable radius of rotation, and the wind wheel is a cup-shaped resistance type wind wheel. The invention is suitable for being installed on the top of a lift type vertical axis wind power generator, can make the wind power generator have good self-starting performance, and can buffer the speed reduction of the wind power generator under high wind speed.

Description

Auxiliary fan for lift type vertical axis wind turbine

technical field

The invention relates to an auxiliary fan of a lift-type vertical-axis wind-driven generator, in particular, it is suitable for being installed on a lift-type vertical-axis wind-driven generator with poor self-starting performance, and is used to improve start-up performance and safety under high wind speed.

technical background

Vertical axis wind turbine (VAWT vertical axis wind turbine) is mainly divided into lift type and drag type from the structural principle. The drag type vertical axis wind turbine mainly uses the resistance generated by the air flowing through the blades as the driving force, while the lift type uses the lift generated by the air flowing through the blades as the driving force. The advantage of the resistance type wind turbine is that the starting torque is large and the starting performance is good, but its speed is low, and the wind energy utilization rate of the wind turbine is lower than that of the horizontal axis wind turbine. The lift type has high speed, large rotational inertia, relatively simple structure, and low cost. However, this structure is difficult to start when the vertical axis wind turbine starts to operate, especially when the wind speed is low, and the operation performance is poor. According to the shape of the blade, the lift type can be divided into two types: straight blade and curved blade. The straight blade can obtain better self-starting performance by reasonably selecting the blade airfoil and installation angle, while the curved blade must be started by other power to achieve required speed for normal operation.

At present, a commonly used way to improve the mechanical structure is to turn the lift-type and drag-type vertical axis wind turbines into a lift-drag wind turbine. Since the drag-type vertical axis wind turbine has good starting performance, the combination of the two improves the overall starting performance. However, the tip speed of the resistance type is relatively small. When a certain wind speed is reached and the speed of the lift type wind turbine is greater than that of the resistance type, the resistance type will cause the resistance of the whole machine and reduce the efficiency of the wind turbine.

At the same time, for horizontal axis wind turbines, in the case of high wind speed, the windward surface of the wind rotor can be reduced through the yaw mechanism, so as to achieve the purpose of reducing speed and protecting the mechanism in a mechanical way. For vertical axis wind turbines, they can receive incoming wind from any direction. When encountering strong winds, there is no buffer to slow down to ensure safety.

Contents of the invention

The technical problem to be solved by the present invention is to provide an auxiliary fan for a lift-type vertical-axis wind-driven generator with a variable radius for installation on the top of a lift-type vertical-axis wind-driven generator in view of the deficiencies of the above-mentioned prior art , so that the wind power generator has good self-starting performance, and it can also buffer the wind power generator to slow down under high wind speed.

In order to solve the above problems, the technical solution adopted by the present invention is: an auxiliary fan for a lift type vertical axis wind power generator, comprising a rotating shaft, a pair of wind wheels and two connecting brackets, characterized in that the rotating shaft is connected to the lift The T-shaped rotating shaft connected to the coaxial axis of the main shaft of the type vertical axis wind turbine; the connecting bracket is a turning rod with a turning angle of 120°±20°, one end of which is connected to the wind wheel at one end, and one end at the short end is connected with a matching Heavy steel balls, the middle turning points of the two connecting brackets are respectively hinged with the two ends of the horizontal short axis of the T-shaped rotating shaft, so that the two wind wheels form a wind wheel with a variable radius of rotation. The wind wheel is a cup-shaped resistance type wind wheel.

Both ends of the short horizontal axis of the T-shaped shaft are processed with grooves, and the middle turning point of the connecting bracket is installed in the grooves through hinge pins.

A spring stopper is slid on the T-shaped rotating shaft, and a compression spring is set between the spring stopper and the horizontal short axis of the T-shaped rotating shaft; a tension spring is installed between the spring stopper and the connecting bracket .

The beneficial effects of the present invention are: (1) Adopting the auxiliary fan with variable rotation radius of the resistance wind wheel improves the start-up performance of the lift-type vertical axis wind power generator at low wind speed, improves the wind power conversion efficiency, and has stronger adaptability (2) When the lift-type wind rotor reaches a suitable blade tip speed ratio, the auxiliary resistance-type wind rotor is adjusted to the coincident position under the action of centrifugal force, which reduces the resistance to the normal operation of the lift-type fan at higher wind speeds and improves Efficiency of the whole machine (3) When the wind speed is too high, the resistance type wind wheel is further deflected under the action of centrifugal force, and the wind wheels reach the other side respectively, which greatly increases the resistance in the wind direction and plays a role in buffering and decelerating the whole machine (4 ) When the wind speed drops, the auxiliary resistance wind wheel returns to a stable position, which can improve self-starting and buffer speed reduction with the change of wind speed.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of the present invention.

Fig. 2 is a partially enlarged schematic view of the spring stopper of the present invention.

Fig. 3 is a schematic structural diagram of Embodiment 1 of the present invention.

Fig. 4 is a schematic structural diagram of Embodiment 2 of the present invention.

Fig. 5 is a schematic structural diagram of Embodiment 3 of the present invention.

Detailed ways

Preferred embodiments of the present invention are described as follows in conjunction with the accompanying drawings:

Embodiment one:

Referring to Fig. 1, the auxiliary fan of the lift-type vertical-axis wind-driven generator includes a rotating shaft, a pair of wind wheels and two connecting brackets 2, and is characterized in that the rotating shaft is coaxial with the main shaft of the lift-type vertical-axis wind-driven generator The T-shaped rotating shaft 4 connected by a line; the connecting bracket 2 is a turning rod with a turning angle of 120°±20°, one of its long ends is connected to the wind wheel, and one of its short ends is connected to a counterweight steel ball 3. The turning points in the middle of the two connecting brackets 2 are respectively hinged with the two ends of the horizontal short axis of the T-shaped rotating shaft 4, so that the two wind wheels form a variable radius wind wheel 1, and the wind wheel 1 It is a cup-shaped resistance type wind wheel.

Embodiment two:

This embodiment is basically the same as Embodiment 1, and the special features are as follows:

Both ends of the short horizontal axis of the T-shaped rotating shaft 4 are processed with grooves, and the middle turning point of the connecting bracket 2 is installed in the grooves through hinge pins 6 .

A spring stopper 5 is slipped on the T-shaped rotating shaft 4, and a compression spring 8 is set between the spring stopper 5 and the horizontal short axis of the T-shaped rotating shaft 4; between the spring stopper 5 and the connecting bracket An extension spring 7 is installed between the 2.

Embodiment three:

Referring to Fig. 1 and Fig. 2, the auxiliary fan of the lift-type vertical axis wind power generator includes a pair of variable radius wind wheels 1, a connecting bracket 2, a counterweight steel ball 3, a T-shaped rotating shaft 4, and a spring retainer Block 5. The pair of variable radius wind wheels 1 are hemispherical resistance type wind wheels, which are respectively consolidated with the connecting bracket 2 and the counterweight steel ball 3 to form a whole. Two connecting brackets 2 with different lengths Forming an included angle of 120°, one end of the long end is connected to a variable radius wind wheel 1, and the other end of the short end is connected to a counterweight steel ball 3. The wind wheel 1 with variable rotation radius, the bracket 2 and the counterweight steel ball 3 are integrally connected with the T-shaped rotating shaft 4 through a hinge 6 . The T-shaped rotating shaft 4 is processed with a pair of grooves at both ends of the horizontal short axis to facilitate the installation of the hinge 6. By coaxially installing the T-shaped rotating shaft 4 and the lift-type wind power generator at the highest position of the generator, make both rotate together. When calculating the size, use the center of mass theorem and determine the center of gravity of the whole by adjusting the weight of the counterweight steel ball; when the wind wheel 1 rotates, the position of the center of gravity changes with the change of wind speed, which plays a role in self-starting and buffering and slowing down effect.

Working conditions are as follows:

As shown in Figure 3, when the wind wheel 1 is not started or at the beginning of starting, under the action of gravity, the counterweight steel ball 3 contacts the long axis section of the T-shaped rotating shaft 4 through the extension spring 7 of the spring stopper 5, and the radius of rotation can be The variable wind wheel 1 is located at the maximum radius. As the wind speed increases, the rotational speed of the wind rotor increases. When the combined force of the variable-radius wind rotor 1 , the connecting bracket 2 and the counterweight steel ball 3 is large enough to drive the counterweight steel ball 3 away from the spring stopper 5 . The drag-type wind generator takes advantage of its own low starting wind speed and large output torque to drive the lift-type wind generator to start under the breeze.

As shown in Figure 4, when the wind speed reaches the rated wind speed, the combined force of the variable radius of rotation wind wheel 1, the connecting bracket 2 and the counterweight steel ball 3 further increases the distance between the center of gravity and the center of rotation. That is, the distance between the rotating radius variable wind wheel 1 and the rotation axis (the resistance wind wheel radius) decreases gradually until the centers of the two cup-shaped wind wheels coincide. At this time, one end of the tension spring 7 is connected to the spring block 5, and the other end is fixed to the short end of the connecting bracket 2 to be elongated, so that the spring block 5 is subjected to an upward force and remains stable under the action of the compression spring 8. , the center of the wind wheel is stabilized in the vertical direction, and the resistance brought by the variable radius of rotation wind wheel 1 is reduced as much as possible.

As shown in Figure 5, when the wind speed exceeds the safe wind speed, due to the combined force of the variable radius of rotation wind wheel 1, the connecting bracket 2 and the steel ball 3 of the counterweight, the distance between the center of gravity and the rotation axis of the whole body is further increased, which promotes The compression spring 8 installed on the upper end of the spring stopper 5 makes the spring stopper 5 slide upward along the long axis section of the T-shaped rotating shaft 4, and the wind wheel rotates in the opposite direction, which greatly increases the overall resistance of the wind power generator, making the It buffers down speed. When the wind speed drops, the wind wheel recovers under the reaction of the clip spring 8, which plays a self-adjusting role.

Claims (2)

1. the accessory fan of a lifting-force type vertical-axis wind power generator, comprise a rotating shaft, a pair of wind wheel and two connection brackets (2), it is characterized in that described rotating shaft is the T font rotating shaft (4) be connected with lifting-force type vertical-axis wind power generator main shaft coaxial line; Described connection bracket (2) is the turnover bar that deflection angle is 120 ° ± 20 °, one of its long end connects described wind wheel, one of short end connects a counterweight steel ball (3), the middle turning point place of described two connection brackets (2) is hinged with the two end part of the horizontal stub shafts of described T font rotating shaft (4) respectively, make described two wind wheels form turning radius changable type wind wheel (1), this wind wheel (1) is cup-shaped resistance type wind wheel; Described T font rotating shaft (a 4) spring block of upper sliding sleeve (5), a suit stage clip (8) between the horizontal stub shafts of this spring block (5) and T font rotating shaft (4); An extension spring (7) is installed between described spring block (5) and connection bracket (2).

2. the accessory fan of lifting-force type vertical-axis wind power generator according to claim 1, the two ends that it is characterized in that the horizontal stub shafts of described T font rotating shaft (4) are processed with groove, and the middle turning point place of described connection bracket (2) is arranged in described groove by joint pin (6).

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