JPS58178881A - Wave power energy converting device - Google Patents

Abstract

PURPOSE:To prevent breakage of a main chamber due to the excessive increase of an air pressure in the main chamber and improve the safety thereof by a method wherein a sub-chamber, capable of absorbing a part of the wave power energy only when abnormally large waves are coming, is provided at the wave receiving side of the main chamber. CONSTITUTION:When the device is attacked by the abnormally large waves, the level of water in the sub chamber 16 repeats up-and-down motions and air in the space 18 of the sub chamber repeats compression and expansion thereby generating an airstream in the direction of an arrow sign E at the opening 19 thereof. In this process, a part of the wave power energy of the abnormally large waves attacking the device is consumed and, further, a part of the same energy is also consumed by a wave eliminating protuberance 17. Accordingly, the wave power energy projected into the main chamber 2 may be weakened considerably, the maximum level location 14 in the main chamber 2 will never become so abnormally high, and the breakage or the like due to the excessive increase of the air pressure in the main chamber 2 may be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shore-fixed wave energy conversion device for converting ocean wave energy into air energy and extracting power, heat, and the like.

A conventional device of this type is shown in FIG. In the figure, (1) is a breakwater or quay, and (2) is a chamber firmly fixed to this breakwater (1), with an opening below the water surface (18a) for introducing wave energy and a chamber interior space (9). ) has an upper opening (18b) for air to enter and exit. (3) is the opening (18b)
) is a duct for guiding the above-mentioned air, and houses an air turbine (4) and a generator (6) inside. At the end of the duct (6), the chamber and the space inside the duct are opened to the atmosphere. Sleeping. (10) is a frame for fixing the duct (8) to the breakwater (1), and (7) is the seabed.

Next, the operation will be explained. Arrow (
Waves (8) advance one after another in the direction of A), and when the sea surface repeats vertical movement in the direction of the arrow (DJ) just before the chamber (2), the force of the waves passes through the opening (18a) and moves into the chamber. It is transmitted to the seawater inside the chamber, and the water surface inside the chamber is indicated by the arrow (1
3) vibrates between the highest position (11) and the lowest position (12). As the air in the chamber interior space (9) is compressed and expanded during kneading, the air is drawn into the air in the direction of the arrow (0) through the duct (8, 1) connected to the upper opening (18b) at its tip (6). The air flow inside the duct at this time causes the turbine (4) connected to the generator (5) to move in and out.
) to generate electricity. In this case, the air flow in the duct becomes a reciprocating flow, so it is common practice to install a rectifier valve in the duct so that the flow flows in one direction in the turbine section. There is no need to provide a rectifier valve because a special turbine is used that rotates tg1 at tg1.

Conventional wave energy conversion devices are configured as described above, so when an abnormally large wave reaches the conversion device,
The highest water level in the chamber rises so much that the air velocity through the turbine increases, causing the turbine and generator to overspeed to the point of failure. In addition, the air pressure inside the chamber could become so high that it could damage the chamber, and seawater could enter the turbine and generator sections.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and includes a sub-chamber in the front part of the chamber (on the side) that can absorb a part of the wave energy only during abnormally large waves. The object of the present invention is to provide a wave energy conversion device that prevents the energy of an abnormally large wave from reaching its mother chamber (main chamber).

An embodiment of the present invention will be described below with reference to the drawings. Second
In the figure, (16) is a sub-chamber attached to the front of the main chamber (2), and its front outer wall softens the wave force applied to the sub-chamber (16) when it receives large waves. It is tilted in order to prevent waves from falling, and its surface is provided with a large number of wave-dissipating protrusions (17). (11+1 is an upper opening provided in the above-mentioned sub-chicken bar 06), from which air in the sub-chamber enters and exits. In addition, this sub-chamber is provided at a height that does not come into contact with seawater in the case of waves with a normal wave height of Jm. The rest of the structure is the same as that of the conventional structure shown in FIG.

Next, its operation will be explained. When there are waves of normal wave height, the auxiliary chamber (16) does not come into contact with seawater at all and does not perform any operation, but when an abnormally large wave like (15) in the figure advances, The lower part of the sub-chamber is immersed in seawater, and the water surface in the sub-chamber moves up and down in the same way as the water surface in the main chamber (2), and the air in the sub-chamber interior space (E) is compressed and expanded. repetition,
At the opening (19), an air flow occurs in the direction of the arrow (g). In this process, the wave energy of the abnormal large wave that has progressed is partially consumed, and the wave energy of the abnormal large wave is also consumed by the abnormal large wave moving up the outer front part of the sub-chamber which has a wave-dissipating protrusion (1η). is partially consumed.

Therefore, the wave energy of the abnormally large wave that enters the main chamber (2) is considerably weakened, and the highest water level in the main chamber at the time of this large wave (the barrel is not abnormally high), so the turbine (4) It is possible to prevent over-rotation of the engine, seawater intrusion into the duct (8), and abnormal pressure increase of the air in the chamber (2).

In addition, in the above embodiment, the opening (111), which is the escape port for air in the subchamber (16), is connected to the subchamber (16).
), but it is also possible to provide an opening at the front of the sub-chamber as shown in FIG. In this case, the air is indicated by the arrow (
F'), consuming a considerable amount of the wave energy of the abnormally large wave. Particularly when this air flows outward, a high-speed airflow is blown onto the advancing waves, so the energy consumption described above cannot be carried out effectively. In addition, if a movable lid Qυ that opens at a predetermined air pressure is provided at the upper part of the sub-chamber, it is possible to prevent the air in the sub-chamber from being excessively pressurized.

Further, in the embodiments shown in FIGS. 2 and 8, the front part of the sub-chamber is inclined, but it may be made perpendicular to the horizontal direction. However, in this case, the wave force applied to the front part of the sub-chamber is greater than when it is tilted1. Also, although a generator was used in these examples, other power converters such as a pump could be used instead. You can also do that.

As described above, according to the present invention, a sub-chamber is attached to the front part of the main chamber at a position that operates only when an abnormally large wave occurs, and a part of the wave energy of the abnormally large wave is consumed in this sub-chamber and its outward direction. This structure prevents over-speed damage to the turbine and generator due to an increase in air flow velocity passing through the turbine, damage to the main chamber due to an excessive rise in air pressure in the main chamber, and seawater intrusion into the turbine and generator. Since malfunctions of the turbine and generator caused by Ih can be prevented, a safe and reliable wave energy conversion device can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view showing a conventional wave energy conversion device, and FIG. 2 is a cross-sectional side view showing an embodiment of the present invention.
FIG. 8 is a sectional side view showing another embodiment of the invention. In the figure, (1) is a breakwater or quay, (2) is a chamber (main chamber), (8) is a duct, (4) is an air turbine, (5) is a generator, (16) is a subchamber, (
+7) is the wave-dissipating protrusion, (time is the upper opening of the sub-chamber, ni) is the front opening of the sub-chamber, and II) is the movable lid. In the drawings, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno −

Claims (1)

[Scope of Claims] (1) In a wave energy conversion device that converts wave energy into air energy and extracts power using a chamber fixed to a breakwater or quay, a 7 m constant A sub-chamber is provided at a position where it does not operate in the case of waves of high wave height, but operates only in the case of large waves of abnormal wave height, and a considerable portion of the wave energy of the above-mentioned large waves is consumed in this sub-chamber. Wave energy conversion device. (2) The wave energy conversion device according to claim 1, wherein the outer wall of the 1iill chamber is sloped. (32) The wave energy conversion device according to claim 2, in which a wave-dissipating protrusion is provided on the outer wall of the two chambers. The wave energy conversion device according to any one of claims 1 to 8. (5) Any one of claims 1 to 4, wherein an opening is provided in the outer wall of the subchamber. The wave energy conversion device according to claim 1. (6) The wave energy conversion device according to claim 5, wherein a movable lid is provided at the top of the subchamber.