JPS58162776A - Savonius windmill - Google Patents

Abstract

PURPOSE:To increase the output power of a windmill and to reduce the weight of a blade, by increasing the height of a semicylindrical side plate from both sides thereof toward its center, and tilting a top plate and a bottom plate both shaped in a semicircular form vertically in the opposite directions. CONSTITUTION:A bucket blade 3 is constituted by fixing the shaft 2 of a windmill to frames 4, extending a semi-cylindrical side plate 5 made of a sailcloth or the like and a top plate 6 and a bottom plate 7 both shaped in a semi-circular form from the frames 4, and tilting the top plate 6 and the bottom plate 7 vertically in the opposite directions in the manner than the height is decreased from the wind receiving opening toward the inside of the bucket. With such an arrangement, it is enabled to reduce the back pressure acted to the blade and to produce a greater torque since the difference of drag at the front and the back sides of the blade is increased. Further, since the blade of this invention is shaped in a bucket form the height of which is small at its middle portion, it is enabled to reduce the number of beams used for the framework and hence to reduce the size and the weight of the windmill providing that the opening area for receiving wind is the same.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of the blades of a Savonius wind turbine, in which semi-cylindrical side plates are formed so that their height decreases from both ends to the center, A packet type blade is constructed by slanting the top plate and the bottom plate toward the upper and lower sides so that the interval narrows from the wind opening toward the back.
To provide a Savonius wind turbine which increases generated power, warms the blades, prevents accumulation of snowflakes, sand dust, etc. in the blades, is easy to handle, and can be operated efficiently.

To explain the structure of one embodiment of the present invention shown in FIGS. 1 to 3, (1) is the underframe of the Savonius wind turbine device. (2) is the underframe (11) rotatably supported in the vertical direction. This is the windmill shaft.

(a) shows a Savonius wind turbine whose diameter is larger than its height, (31 is the packet type blade, (41 is a frame body that supports the blade (3) while maintaining its shape, and the rod frame body (4) is the windmill shaft. (2), and a semi-cylindrical side plate (5), a semi-circular top plate (6) and a bottom plate (7) of Hanpugo are attached to the frame (4), and its ventilation opening The packet type blade (3) is constructed by slanting the top plate (6) and the bottom plate (7) vertically to opposite sides so that the height decreases toward the inner part.

(8) is a power extraction mechanism from the wind turbine shaft (2), and (9) is the wind direction.

Next, its effect will be explained. Due to the wind in the direction of the arrow (9), the wind pressure that hits the inside of one blade (31) from the wind opening of one blade (3) and the wind pressure from the back of the other blade (3), that is, the back Due to the pressure difference, a torque is generated in the direction of the arrow in Figure 1, causing the windmill (a) to rotate, and power is transmitted from the windmill shaft (2) to the required machinery such as a pump via the power extraction mechanism (8). is transmitted.

In the conventional Savonius wind turbine, as shown in Figures 4 and 5, the blades (B) of the Savonius wind turbine (A)
The blade is box-shaped with a U-shaped cross section, and has a large circular top plate and bottom plate. There were shortcomings such as increased operation stoppages, equipment damage, and serious malfunctions.

However, since the Savonius wind turbine of the present invention is configured as described above, the back pressure on the blades is reduced, the difference in drag between the front and rear sides of the blades is large, and moreover, a larger torque is generated, and the same wind opening area is used. With this structure, the blades are packet-shaped with a small height in the center, so the back pressure resistance is small, and the number of beams in the frame can be reduced. Power loss due to weight is reduced.

Furthermore, due to the slope of the bottom plate of the blade, deposits such as snowflakes and dust inside the blade slide down and are discharged to the outside of the blade. , the wind on its bottom plate.

As the car rotates, wind pressure from the top downwards and from the bottom upwards acts repeatedly, causing deformation of the bottom plate due to vibration and distortion, causing deposits on the bottom plate to separate and float. Combined with the slope of the blade, it quickly and smoothly slides out of the blade and is ejected.

Also, when using canvas for the side plates, top plate, and bottom plate,
The bottom plate is agitated in the vertical direction to further enhance the above effect.
With this feature, harmful deposits such as snowflakes and dust can be automatically removed from the blade.

Moreover, it has the advantage of being simple in structure and easy to assemble and install.

[Brief explanation of the drawing]

Figure 1 is a plan view of a Saboeus wind turbine device showing one embodiment of the present invention, with a portion cut away. Figure 2 is a front view of the same as above, Figure 3 is a sectional view taken along the line Xia-■ in Figure 2, and Figure 4 is a front view of a conventional Savonius wind turbine. Figure 5 is the same as Figure 4.
FIG. (2)...Windmill shaft, (3)...Packet type blade, (5)...Side plate, (6)...Top plate, (71...
Bottom plate, Z diagram

Claims (1)

[Claims] The semi-cylindrical side plates are formed so that the height decreases from both ends to the center, and the semi-circular top plate and bottom plate are vertically opposed so that the interval becomes narrower from the airflow opening to the real part. A Savonius windmill is characterized in that a pair of packet-shaped blades tilted to the side are attached to a windmill shaft with seventy wind openings facing each other and left and right**.