JPS6048632B2 - Float type wave power generation device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a float-type wave power generation device.

A float-type wave consisting of a floating frame fixed with an anchor on the sea, which is equipped with a float that moves up and down with the waves, an electric motor, and a motion conversion device that converts the up-and-down motion of the float into rotational motion and inputs it to the generator. Power generating devices are known.

In order to effectively operate this known power generation device, it is necessary to securely fix the floating frame, and also to ensure that the float, which is supported by the floating frame so as to be able to rise and fall, can move up and down smoothly and efficiently due to waves. There is.

Anchor lines and anchors are used to secure the floating frame.

In addition, although cylindrical or disc-shaped floats are generally used, conventionally known floats have difficulty in efficiently moving the float up and down, making it impossible to increase power generation efficiency. The present invention has been made based on the above-mentioned viewpoints, and its purpose is to provide a wave power generation device with high power generation efficiency, which is equipped with an improved float so that wave energy can be effectively utilized. There is a particular thing.

Therefore, the gist of the present invention is that the thickness of the float is configured to increase gradually in the direction of wave propagation, and the external force acting on the float during wave action is applied to the float before and after the float in the direction of wave propagation. The objective is to balance the waves, use wave energy effectively, and increase power generation efficiency. Note that this wave power generation device is usually installed near the coast, where waves usually travel from offshore to the coast, so in the following description of the present invention, unless otherwise specified, such However,
The present invention is not necessarily limited to such a case, and the direction of travel of the waves may be any direction, and it goes without saying that the present invention can be carried out even in cases where the direction of travel changes from time to time. be.

The details of the present invention will be explained below with reference to the drawings.

FIG. 1 is a side view showing an embodiment of the wave power generation device according to the present invention, FIG. 2 is a plan view thereof, and FIG. FIG. 4 is an explanatory diagram showing the state of the float used in the wave power generation device according to the present invention during waves, and FIG.
FIG. 6 is a plan view of the float showing a rotated state, and FIG. 7 is a sectional view of e-g in FIG. 6. Therefore, 1 in the figure is a floating frame, 2
1 is a float, 3 and 4 are guide wheels, 5 is a machine room in which a generator and others are housed, 6 is a lifting shaft fixed to the float 2, 7 is an anchor, 8 is an anchor cable, and 9 is a wave surface.

The floating frame 1 is a rectangular or cylindrical floating body consisting of main pillars 1a, 1a, rods 1b, 1c, 1d, etc., and is made of light material or is floated on the sea with appropriate floats attached. It is fixed by the anchor 7 and the anchor cable 8, or further via a damper if necessary.

The float 2 is supported by the floating frame 1 so as to be able to rise and fall through guide wheels 3 and 4 that can run along the main pillars 1a and 1a of the floating frame 1, and moves up and down along with the J axis 6 according to the up and down of the wave surface. Go up and down.

A lift shaft 6 fixed to the float 2 is a shaft that transmits the vertical movement of the float 2 to equipment in the machine room 5. In the machine room 5, there are provided a known generator, a motion conversion device for transmitting the vertical movement of the lifting shaft 6 to the generator, a power storage device, a storage battery, power transmission equipment, various power consumption devices, and the like.

As the above-mentioned motion converting device, for example, one consisting of a reciprocating piston type or rotary piston type air compressor and an air turbine, or one consisting of a one-way clutch, a flywheel, a continuously variable transmission, etc. are known. ing. In addition, as the float 2, although a thick and short cylindrical one is shown, an elongated cylindrical one can also be used, and if the free frequency of floating and sinking is made to match the frequency of the waves, the float will rise and fall above the wave height. The dynamic amplitude can be obtained. The gist of the present invention is that the thickness of the float is configured to increase gradually in the direction of wave propagation, and the external force acting on the float during wave action is balanced between the offshore side and the shore side. If the movement of the float is smooth. The objective is to use wave energy effectively, that is, to ensure that wave energy is smoothly transmitted to the generator.

If the thickness of the float is uniform, as shown in FIG. It acts to rotate in the direction of.

The rotational force indicated by arrow A is expressed by points A, T, and H in the figure where the horizontal wave surfaces 9 and 9' intersect with the float 10. The rotational force of arrow B, which acts in a direction that balances the rotational force of arrow A, is proportional to the volume of the waves in the area surrounded by 1, 2, and 1 in the figure. Therefore, the rotational forces A and B are balanced when the wavefront 9 at point A of the float 10 reaches point C. In other words, the ability to push the lifting shaft 6 in the axial direction can only be obtained when the wave front 9 of the waves covers the float 10, and the force that restores the float 10 tilted by the rotational force A is due to the movement of the center of gravity due to the tilt of the float 10. The drawback was that it relied solely on the buoyancy associated with the movement. Therefore, as mentioned above, if at least one of the top or bottom surfaces of the float 2 is made sloped, and the buoyancy on the shore side is made larger than on the offshore side, the buoyancy caused by the waves will efficiently lead to the vertical movement of the float, and as a result. This increases the power generation effect.

In other words, the waves acting on the float 2, especially the waves acting on the float 2 in the lowered position and raising the float, are caused by the parallel movement of the wave surface, which slopes upward from the shore side to the offshore side, toward the shore side. Therefore, the buoyant force on the float 2 acts from the offshore side, and is greater on the offshore side than on the coast. Therefore, the float 2 is displaced and tilted so that the offshore side is higher and the coast side is lower. However, according to the present invention, as shown in FIG. By reducing the volume of the wave surface and increasing the volume on the shore side, the inclined wave surface 9 of the wave reaches the point where the lifting shaft 6 is attached to the float 10, and the tip of the inclined wave surface 9 becomes horizontal. Wave surface 9,9'
When the point R is reached, where and the float 2 intersect, the volume of the part surrounded by Chi, Ri, and O becomes the same as the volume of the part surrounded by Ri, Ru, and O.

Therefore, considering the rotational moments C and D around point ri, the volume of the part surrounded by ri, ri, and o that produces the rotational moment C, and the volume of the part surrounded by ri and o that produces the rotational moment D. Since the volumes of the parts are the same, the rotational moments C and D
will be in equilibrium. Waves are higher on the offshore side and lower on the shore side, so there is horizontal wave pressure, or wave force, that is applied to the float 2 from the sides, but if we ignore this, The float 2 rises while remaining horizontal in terms of buoyancy, and efficiently raises the lifting shaft 6. On the other hand, as shown in FIG. 5, the waves move from the G position shown by the chain line to the H position shown by the solid line.

The float 2, which has risen due to the slope of the moving waves, tilts as shown by the solid lines CH', R', N', R', but at this time, the float 2 is tilted from the line connecting CH', R' Since the waves traveling above do not have any effect on the buoyancy of the float 2, the buoyant force generated by the waves traveling above the line connecting the waves ′ and ru′ will affect the floating frame including the tilted float 2. 1 resilience. Furthermore, as the waves become higher, stronger, and steeper, the inclination of the float 2 becomes steeper and larger, but the amount of waves traveling through the area surrounded by the float 2', ``nu'', and ``ru'' also increases. Since the restoring force of the float 2 increases in proportion to this, the increased restoring force quickly restores the inclination of the floating frame 1 including the float 2 and stabilizes it in a horizontally floating position. Furthermore, since the upper surface of the float 2 is inclined so that it is thicker on the shore side than on the offshore side, as shown in Figure 6, which is a plan view of the float 2 seen from above, the thickness of the float 2 is Assuming that the float 2 is rotated counterclockwise so that the so-called contour line Ef that indicates the wave direction is inclined with respect to the arrow F that indicates the direction of wave movement, the float 2 is rotated in a direction perpendicular to the arrow F at point e. The cross section taken along the Eg line is an inclined cross section as shown in FIG.

Therefore, due to the pressure of waves applied to this cross-sectional area, the force pushing the float 2 from the side increases as the cross-sectional area moves from point g to point e. A rotational force is generated against the rotational force, and the float 2 is rotated clockwise in FIG. Then, the contour line Ef is an arrow F indicating the direction of movement of the waves.
When the wave becomes perpendicular to the wave, the pressure of the wave averages out and becomes stationary. In other words, the float 2 is stabilized so that the thin tip of the float 2 always faces offshore. Incidentally, there is no particular problem since the lowering of the float 2 takes a certain amount of time as the waves pass and due to the weight of the float 2 after passing. However, the inclination angle of the upper and lower surfaces of the float depends on the weather and sea conditions of the installation location of the wave power generation device, especially the inclination angle, period, amplitude, wavelength, etc. of the waves, as well as the structure and shape of the floating frame 1 and the float 2. , it is necessary to appropriately determine the size, material, position of the anchor cable attachment part 8a, etc.

Since the present invention is constructed as described above, according to the present invention, wave energy can be used effectively, and therefore a wave power generation device with high power generation efficiency can be provided.

In addition, if a blade row consisting of a large number of parallel blades having a vertical chord is provided at the lower part of the floating frame 1, the swinging of the floating frame 1 can be suppressed, and even more efficient power generation becomes possible.

In addition, when the power generation device of the present invention is floating in the ocean where the direction of wave movement changes depending on the season and weather conditions, rather than near the coast where the direction of movement of waves is always constant, the floating frame 1 Alternatively, it is necessary to set the float 2 to a desired angle, preferably automatically controlling the rotation. Although it is desirable that at least one of the upper and lower surfaces of the float 2 be a continuous and smooth slope as described above, in some cases,
This does not preclude partial buoyancy adjustment by using a different staircase shape or by adding a separate float or weight.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the wave power generation device according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a float used in a conventional wave power generation device. FIG. 4 is an explanatory diagram showing the state of the float used in the wave power generation device according to the present invention during waves, and FIG. Figure 6 showing the tilted state
The figure is a plan view of the float showing the state in which the float is rotated, and FIG. 7 is a sectional view taken along the line e-g in FIG. 6. 1...Floating frame, 2...Float, 3,4
...Guide wheel, 5...Machine room, 6...
... Lifting axis, 7 ... Anchor, 89 ...
Anchor cable, 9...Wave surface.

Claims (1)

[Claims] 1. A floating frame fixed to a desired position on the sea with an anchor, a float supported by the floating frame so as to be able to rise and fall freely, a generator installed on the floating frame, and a generator that controls the vertical movement of the float. and a motion conversion device capable of converting the rotational motion of the input shaft into rotational motion of the input shaft, the above-mentioned rotatable wave power generation device is characterized in that the thickness of the float is configured to increase sequentially in the direction of wave propagation. power generator.