JPS5936705Y2 - vertical axis windmill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical axis wind turbine using airfoil-shaped blades, particularly a vertical axis landscape in which the blades of a Griuss type wind turbine are provided with auxiliary vanes for starting and braking purposes.

In general, Grius-type wind turbines are windmills that rotate efficiently, and have recently been emphasized for the use of wind energy for power generation from an energy-saving perspective. Without it, smooth rotational drive is difficult.

Furthermore, there are disadvantages such as the need to apply strong pressure when braking.

The present invention aims to improve Grius-type wind turbines in order to address these circumstances.The wind turbine does not need to apply external force when starting, and can self-start even in light winds, and also allows strong pressure to be applied during braking. The present invention provides a vertical axis wind turbine using airfoil-shaped blades that does not require brake application.

Below, embodiments of the present invention will be described based on the drawings.
The figure is a partially sectional front view, Figure 2 is a plan view, Figure 3 is a cross-sectional view of the blade, Figure 4 is a plan view of the auxiliary blade, Figure 5 is a perspective view of the auxiliary blade, and Figure 6 is a perspective view of the auxiliary blade. This is a perspective view showing another example of the auxiliary blade, in which 1 is an airfoil-shaped blade, 2 is a vertical shaft, 3 is a rotating support base, 4 is a starting auxiliary blade, and 5 is a braking auxiliary blade.

The blades 1 have a multi-stage configuration of four upper blades and four lower blades parallel to the vertical axis 2, and are, for example, a modified Grius type wind turbine with cross-shaped support blades 6 arranged at equal intervals.

The auxiliary vanes 4 and 5 are such that one end thereof is supported pivotally in the length direction of the blade 1 on the airfoil-shaped curved surface of the blade 1, and the other end thereof can be opened and closed at a constant height in the width direction of the blade 1. As shown in FIG. 5, the auxiliary blade 4 is located between a pair of substantially triangular opening/closing guide plates 7, 7 facing each other at a constant interval in the length direction of the blade 1. It is a plate-shaped body whose one end is supported pivotally via a shaft rod 8, and which forms the same curved surface as the airfoil-shaped curved surface in the closed state.

The shaft rod 8 of this auxiliary blade 4 is in contact with the opening/closing guide plates 7, 7, which have an acute angle in the thick part of the blade 1, and the other end is in contact with the thin part. A pin 10.10 engages with a guide hole 9°9 drilled in an arc shape at the tail (opposite side) of the pin 10.10.
It is equipped with

In order to always bias the auxiliary blade 4 in the opening direction, a spring 11 having a U-shaped cross section is inserted and fixed between the blade 1 and the auxiliary blade 4 near the shaft 8.

The spring 11 may be made of metal, but may also be made of flexible synthetic resin and have approximately the same length as the auxiliary blade 4, or may be partially attached in two or three pieces.

Furthermore, the auxiliary blade 4 and the blade 1 may be connected by a hinge with a spring that urges them in the opening direction so that the auxiliary blade 4 is always open.

In this case, it is not necessary to provide the shaft 8, and the auxiliary blade 4 can be opened and closed only by the spring-equipped hinge.

Therefore, the other end of the auxiliary blade 4 always tries to open from the airfoil curved surface of the blade 1, and in the opened state, the other end of the auxiliary blade 4 is in the pocket 12 formed by the opening/closing guide plates 7, 7, the auxiliary blade 4, and the blade 1. Wind enters and increases the rotational torque of the blades.

For this purpose, as shown in FIG. 3, the pocket 12 is enlarged and recessed in the blade 1 to also serve as a storage area for the auxiliary blade 4.

A portion 13 is formed.

However, if the auxiliary blade 4 is brought into close contact with the airfoil-shaped curved surface of the blade 1 and a pocket can be created, the recess 13 is not necessary.

However, the auxiliary blade 4 as a lever is provided on the side of the blade 1 facing the vertical axis 2, so that when the blade 1 rotates at high speed, the auxiliary blade 4 closes due to centrifugal force against the force of the spring 11. It has become.

The blade 1 is a hollow body to reduce weight, and is constructed by molding two thin plates and joining them together to facilitate the formation of an airfoil shape and increase strength.

Next, the auxiliary blade 5 is provided in the opposite position corresponding to the auxiliary blade 4, and has approximately the same configuration as the auxiliary blade 4, and corresponding parts of the auxiliary blade 4 are given the same numbers and dashes. It is.

This auxiliary blade 5 forms a pocket 12' that is open in the direction of rotation of the blade 1, and while the auxiliary blade 4 promotes the rotation of the blade 1, the auxiliary blade 5 prevents the rotation of the blade 1 and acts as a brake. Indicates the braking action to be applied.

The spring 11' of this auxiliary vane 5 is in contact with the outer side of the shaft 8, that is, with the outermost part of the auxiliary vane 5, and always presses the vane 5 in the closing direction.

The pressing force of this spring 11' is determined assuming a case where the wind speed exceeds a certain level and the wind turbine over-rotates.

Therefore, the auxiliary blades 5 do not open while the wind turbine is rotating at a constant rotation speed, and when the wind turbine rotates at a constant rotation speed, the auxiliary blades 5 open due to centrifugal force against the force of the spring 11'. Since the air current is introduced into the pocket 12', the rotation of the wind turbine can be braked and the harmful effects caused by over-rotation can be prevented.

The blade 1 may be of a vertical type or a curved type, or may be of an umbrella-like type in which the upper portions are inclined inwardly.

When this umbrella-shaped blade is used, the inclination is utilized and the auxiliary blade 4 is installed on the lower side of the slope of the blade, and the auxiliary blade 5 is installed on the slope -L side of the fluid.
11', each auxiliary vane can be made to open automatically by gravity and centrifugal force.

The blade 1 may be provided with auxiliary blades 4 and 5, each extending along the entire length of the blade, or may be provided in an appropriate number of stages as shown in the figure.

The auxiliary blades 4 and 5 have blades 1 at both ends as shown in FIG.
The opening/closing guide plates 7, 7 may be omitted by attaching a foldable bellows 14, 14 coupled to the opening/closing guide plates 7, 7.

As described above, according to the present invention, auxiliary vanes are provided on the airfoil-shaped curved surface of the blade that can form pockets into which airflow enters, and one of them increases the rotational torque of the blade at startup, while the other increases the rotational torque of the blade during high-speed rotation. In addition to closing by force, the other side also has a braking effect that closes when the blade rotates normally and opens when it overspeeds, so it can be rotated even in a slight wind without applying external force when starting, and on the other hand, if the blade rotates at high speed, it will not start. The auxiliary blades for the engine close due to centrifugal force, and the auxiliary blades for braking open against the spring force in the event of overspeeding, so starting and braking are performed automatically, increasing the efficiency of this type of vertical axis wind turbine. , wind energy extraction becomes extremely effective.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a partially sectional front view of a vertical axis wind turbine, Fig. 2 is a plan view, Fig. 3 is a cross-sectional view of the blade, and Fig. 4 is a plan view of the auxiliary blade. , FIG. 5 is a perspective view showing the auxiliary blade, and FIG. 6 is a perspective view showing another example of the auxiliary blade. 1...Blade, 2...Vertical axis, 4,
5...Auxiliary blade, 7,7...Opening/closing guide plate, 8,8'...Axle rod, 9,9'...
...Guide hole, 10.10' ...Pin. 11, 11'... Spring.

Claims (1)

[Scope of utility model registration request] In a wind turbine with a vertical axis using airfoil-shaped blades, which has auxiliary starting blades 4 on the inner side of the blade and auxiliary braking blades 5 on the outer side of the blade, which can be opened and closed, the auxiliary starting blades 4 are The opening/closing shaft 8 is located on the front side in the direction of rotation of the blade and is provided with a spring 11 that always biases the blade 4 in the opening direction, and the auxiliary braking blade 5 has its opening/closing shaft 8' located on the rear side in the direction of rotation of the blade, and A vertical axis wind turbine characterized by comprising a spring 11' that always biases the blade 5 in the open direction.