JPS581273B2 - Wave energy conversion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an energy conversion device that extracts wave energy as fluid energy on a coastline.

Waves crash almost parallel to the coastline, and have kinetic energy in the direction of travel and potential energy in the vertical direction.The combined energy of these is proportional to the square of the wave height, and the energy is proportional to the square of the wave height. It is known that the energy of a wave with a wave height of 2 m is approximately 25 kW.

In order to effectively utilize the energy of waves, it is desirable to provide an efficient energy conversion device that can extract both kinetic energy and potential energy at the same time and is not affected by tidal differences.

FIG. 1 shows a side sectional view of a conventionally considered device for extracting wave energy from a coastline.

Waves 1 hitting the shore transmit the movement of a piston 5 that moves due to wave pressure in a piston chamber 4 provided in a dam 3 provided on the shore 2 to a hydraulic pump 6 provided in contact with the piston chamber 4. , converted into hydraulic energy and driven by a hydraulic motor 7,
It is designed to operate the generator 8.

This method mainly extracts kinetic energy from waves, and it is impossible to extract energy efficiently at both low and high tides.

FIG. 2 shows a side sectional view of another conventional wave energy extraction device.

By raising and lowering the water level in an air chamber 9 fixed to the shore 2 by waves 1, the air inside is pushed out or sucked in, thereby rotating an air turbine generator 10.

This method mainly extracts the potential energy of waves, and has the disadvantage that the air chamber must be very large in order to operate effectively at both low and high tides, making it expensive.

SUMMARY OF THE INVENTION An object of the present invention is to provide a wave energy conversion device that is not affected by ebb and flow and can effectively extract kinetic and potential energy of waves at the same time.

Next, embodiments of the present invention will be explained based on the drawings.

FIG. 3 is a side view of a wave energy conversion device according to an embodiment of the present invention.

A horizontal arm 13 protruding above the sea surface is rotatably attached to a fulcrum 12 provided at the top of a fixed base 11 installed on the shore 2,
The bottom of the cylinder is pivoted to a fulcrum 14 protruding from the lower surface of the horizontal arm 13 near the fulcrum 12, and to a fulcrum 15 provided at the base end of the fixed base 11 facing the sea surface.The vertical kinetic energy of the waves is extracted. The piston rod of the first fluid cylinder 16 is connected with a pin, and a fulcrum 1 is provided at the protruding tip of the horizontal arm 13.
A vertical arm 18 is rotatably attached to 7.

A wave receiving plate 20 to which a float 19 is fixed is attached to the lower end of the vertical arm 18 so as to float on the sea surface in the direction of wave propagation.
The upper end is made to protrude upward from the attachment fulcrum 17 to the horizontal arm 13.

One end of a rope 21 is tied to the upper end of the vertical arm 18, and the rope 21 is attached to the fixed base 11 via a pulley 22, and the bottom of the cylinder is fixed to the shore.A second fluid extracts energy in the traveling direction of waves. It is connected to the piston rod of the cylinder 23.

The cylinder 23 is equipped with a return spring 24 on its piston rod.

Further, the cylinders 16 and 23 are connected to a fluid utilization device and a fluid supply device (not shown) by a flexible pipe (not shown).

When the wave 1 rushes in the direction of the arrow, the wave receiving plate 20 is pushed horizontally, the rope 21 is pulled to the left, and the piston of the second cylinder 23 is pushed upward.

At the same time, the horizontal arm 13 is pushed up by the wave, and the piston of the first cylinder 16 is pushed upward.

The fluids pressurized in cylinders 16 and 23 can be used separately or in combination.

When the wave passes, the wave receiving plate 20 returns to its original position due to its own weight and the returning wave, the piston of the cylinder 23 is pushed downward by the return spring 24, and the piston of the cylinder 16 is pushed downward by the own weight of the horizontal arm 13, and its The working fluid is sucked into the cylinder.

If the solid lines in Figure 3 are for high tide, then at low tide the horizontal arm 13, vertical arm 18, wave receiving plate 20, and rope 21 are in the positions shown by the dotted lines, and the piston of the cylinder 16 is pushed down as shown by the dotted line. ing.

When a wave approaches in this state, the cylinder compresses the fluid and converts the wave energy into fluid energy using the same operation as above.

The influence of the displacement of the position of the wave receiving plate 20 due to the tidal difference will be small if the horizontal arm 13 is chosen to be long enough, and if the cylinder 16 is chosen to have a long stroke, the tidal difference will be absorbed by the cylinder 16. can do.

FIG. 4 is a side view of a wave energy conversion device according to another embodiment of the present invention.

Components designated by the same reference numerals as in FIG. 3 are the same parts.

A horizontal arm 13 protruding above the sea surface is rotatably attached to a fulcrum 12 provided at the top of a fixed base 11 installed on the shore 2,
The bottom of the cylinder is pivoted to the support 14 protruding from the lower surface of the horizontal arm 13 near the fulcrum 12 at the base end 15 of the fixed base 11 facing the sea surface. The piston rod of the first fluid cylinder 16 to be taken out is connected with a pin, and a fulcrum 17 is provided at the protruding tip of the horizontal arm 13.
A vertical arm 18 is rotatably attached to the.

A wave receiving plate 20 to which a float 19 is fixed is attached to the lower end of the vertical bowl 18 so as to float on the sea surface in the direction of wave propagation.
The upper end is made to protrude upward from the attachment fulcrum 17 to the horizontal arm 13.

A fulcrum 25 is provided at the upper end of the vertical arm 18, and this fulcrum 25 is
The bottom of the cylinder is pivoted to a fulcrum 26 protruding from the upper surface of the horizontal arm 13, and is pin-coupled to a piston rod of a second fluid cylinder 23 which extracts energy in the direction of wave propagation.

The cylinders 16 and 23 are connected to a fluid utilization device and a fluid supply device (not shown) by flexible pipes (not shown).

When the wave 1 rushes in the direction of the arrow, the wave receiving plate 20 is pushed in that direction, and the upper end of the vertical arm 18 moves to the left, pushing the piston of the second fluid cylinder 23 to the left, thereby causing the inside of the cylinder to Compress the fluid.

At the same time, the horizontal arm 13 is pushed up by the wave and the piston of the first fluid cylinder 16 is pushed upwards, compressing the fluid in the cylinder.

The fluids pressurized in cylinders 16 and 23 can be used separately or in combination.

When the waves pass, the wave receiving plate 20 and the horizontal arm 13 return to their original positions due to their own weight and the returning waves, and the cylinder 16
The pistons 23 and 23 also return to their original positions, drawing working fluid into the cylinder.

In this case as well, if a cylinder 16 with a long stroke is selected, the tidal difference can be absorbed, and wave energy can be effectively extracted without being affected by the ebb and flow.

According to the present invention, the kinetic energy and potential energy of waves can be efficiently extracted at the same time without being affected by ebb and flow.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a conventional wave energy extraction device on a coastline, FIG. 2 is a side sectional view of another conventional wave energy extraction device, and FIG. 3 is a side sectional view of a wave energy conversion device according to an embodiment of the present invention. Side View, FIG. 4 is a side view of a wave energy conversion device according to another embodiment of the present invention. 1: Wave, 2: Land shore, 3: Weir, 4: Piston chamber, 5: Piston, 6: Hydraulic pump, 7: Hydraulic motor, 8: Generator, 9: Air chamber, 10: Air turbine generator, 11 : fixed base, 12: fulcrum, 13: horizontal arm, 14: fulcrum, 15: fulcrum, 16: first fluid cylinder, 17: fulcrum, 18: vertical arm, 19: float, 20: wave receiving plate, 21: rope, 22: pulley, 23: second fluid cylinder, 24: return spring, 25: fulcrum, 26: fulcrum.

Claims (1)

[Scope of Claims] 1. A horizontal arm protruding above the sea surface is rotatably attached to the upper part of a fixed base installed on the shore, and a lower surface of the horizontal arm near the attachment point to the fixed base is The protruding fulcrum is pin-coupled to the piston rond of a first fluid cylinder that extracts the vertical motion energy of waves, the bottom of which is pivotally connected to the base end facing the sea surface of the fixed base, and the horizontal arm protrudes. At the tip, a vertical arm is rotatably attached, with a wave receiving plate with a float at the lower end floating on the sea surface in the direction of wave propagation, and the upper end of this vertical arm protrudes upward from the point where it is attached to the horizontal arm. A wave energy conversion device characterized in that a piston rond of a second fluid cylinder for extracting energy in the traveling direction of waves is coupled to this protruding upper end. 2. The wave energy conversion device according to claim 1, wherein the second fluid cylinder is fixed to the shore, and its piston rod is connected to the upper end of the vertical arm via a rope. 3. In the item set forth in claim 1, the second fluid cylinder has its bottom portion pivoted to a fulcrum projecting from the upper surface of the horizontal arm, and its piston rod is pin-coupled to the upper end of the vertical arm. A wave energy conversion device.