JPS58200081A - Wave energy converting apparatus - Google Patents

Abstract

PURPOSE:To raise the energy converting efficiency of an energy converting apparatus over a wide range of wave length, by dividing a chamber into a plurality of sections in an inward direction, and separating the spaces above respective water surfaces in the chamber from each other. CONSTITUTION:In case that the wave length of waves advancing toward a chamber 3 is longer than an optimum value, the energy converting efficiency of the chamber is almost equal to that of the conventional apparatus. However, in case that the wave length is smaller than the optimum value, sea-water surfaces 12, 13 are moved vertically with different phases. Here, since spaces 16, 17 are separated from each other, air in these two spaces 16, 17 is compressed and expanded effectively and independently. In the drawing, arrows indicate the direction of air flow.

Description

[Detailed Description of the Invention] The present invention relates to a wave crab energy conversion device, and more specifically, it is a device for converting wave crab energy from the ocean etc. into air energy and extracting power normal heat, etc. This invention relates to a wave energy conversion device that is fixed on the shore.

Conventionally, there was a device for this building as shown in Figure 1.

In the figure, a robust chamber 3 is firmly fixed to a breakwater or quay and to a seabed with an opening DA for introducing wave energy and an opening S for air flow in and out.
is formed.

An air duct 6 having an open end in the atmosphere is connected to the opening S, and an air turbine 7 to which a generator g is connected is installed inside the air duct 6. - With the above configuration, waves 9 come one after another from a distance toward the chamber 3, and when they reach the front of the chamber 3, the energy of the waves is transmitted to the seawater in the chamber 3 through the opening DA, and the seawater level 10 As the air returns, an air flow is generated in the air duct 6, and this flow drives the air turbine connected to the generator g to generate electricity. Efficiency in converting wave energy into air flow energy (Champa 3
The conversion efficiency) is related to the wavelength L of the wave incident on the chamber 3 (wavelength of the incident wave) and the depth A of the chamber 3. FIG. 2 shows the relationship between the conversion efficiency of the chamber 3 and A/L, and the conversion efficiency is maximum (optimal) at a specific A/L value.

This specific value is about O/~O75, and when it deviates from this value, the conversion efficiency drops sharply. The reason for this is thought to be as follows. If the wavelength is too good than the optimum value, only a part of the wave energy can be converted, and if the wavelength is too short than the optimum value, waves will be generated in the chamber 3 and the sea level lθ will be uniform. do not go up or down,
This is because air is not compressed or expanded effectively. If the wavelength is too long, the wave energy is large, so there is no problem even if the conversion efficiency is small. On the other hand, if the wavelength is too short, the wave energy is small and the conversion efficiency is low, so the final The amount of □ energy that can be used for practical purposes becomes extremely small, making it difficult to study in practical terms.

When actually installing a wave canine key conversion device,
5. Determine the value of the depth A of the chamber 3 so that it is optimal for the wavelengths that are less likely to occur at the installation location. However, since the waves generated in actual ocean waters have extremely long wavelengths, conventional wave-canine-Nelki converters have the drawback of not being able to continuously generate high-efficiency power. Therefore, one possibility is to change the depth A of the chamber according to the wavelength.
Considering the use in the extremely harsh environment of the sea, this idea is not practical.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and the chambers are connected to each other in seawater, but the air above the sea surface is separated from each other. The purpose of this invention is to provide a wave energy conversion device that has high energy conversion efficiency for wavelengths shorter than the optimum wavelength by dividing the wavelength into individual wavelengths.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 3, a partition plate // is provided to divide the chamber 3 in the depth direction. Each divided chamber has a mutually isolated space /A, /7 air duct /4I for sending air to the air turbine.

/S are installed in succession.

Next, the operation will be explained. Here, consider a case where the effective depth ('B 10 ) of the chamber 3 is made equal to the chamber depth A of the conventional device. If the wavelength of the wave advancing into chamber 3 is longer than the above optimal value, the space /l, , /
Each sea level of I/2. /3 moves up and down at the same time. Therefore, the conversion efficiency of the chamber is almost the same as in conventional devices. However, in this case, since there is a partition plate inside the chamber 3, this causes energy loss and the conversion efficiency is slightly lower than that of the conventional device. Next, when the wavelength is shorter than the optimum value, the sea level /2 and /J move up and down with a mutual phase shift, but the spaces /l, , /7 are isolated from each other, so they each move up and down. The air in each space is effectively compressed and expanded separately. Arrows indicate the direction of airflow. Therefore, the conversion efficiency is greatly improved compared to conventional devices. Figure 5 compares this example with the conventional device regarding the relationship between the conversion efficiency of the chamber and the effective depth of the chamber/wavelength of the human radiation wave. The characteristics of the present invention shown are that the conversion efficiency is high over a wide wavelength range. In addition, the air duct ill, /! connected to the space /A, /7 in the chamber divided by the partition plate. ; are also kept separate from each other.

FIG. 3 shows the use of a single air turbine that rotates in the same direction even during reciprocating air flows (arrows). In this embodiment, the air ducts iti, is are arranged concentrically at the air turbine 70 site to supply respective air flows to different parts of the blades of the air turbine 7, so that the air ducts iti, is Even if the directions of the air flows in and 15 are opposite to each other at a given moment, the air in both air ducts generates a force that rotates the air turret in the same direction.

In addition, in the above embodiment, the case where the chamber 3 is divided into λ parts and one air turbine 7 is operated is explained.
Separate air turbines may be operated using air energy from each of the divided spaces.

Further, the same effect can be obtained even if the chamber 3 is divided into three parts by partition plates // as shown in Fig. S.

As described above, according to the present invention, the interior of the chamber is divided into a plurality of parts in the execution direction, and the spaces above the water surface in the chamber are isolated from each other, while being connected underwater, so that a wide wavelength range can be obtained. This has the effect of providing high energy conversion efficiency over the entire range.

Figure 3 is a schematic side sectional view of one embodiment of the present invention, Figure 9 is a characteristic diagram also showing conversion efficiency, and Figure S is a schematic side view of another embodiment. FIG.

/... Breakwater or quay, λ... Seabed, 3... Chamber, Da... Opening, S... Opening, 6... Air duct, 7
・・Air turbine, g・・generator, de・・wave, IO・
・Sea level, ll・・Partition plate, /2. /3... sea level, t
'e, is... air duct, /4, /7... space.

In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Flame 2 9P) Figure 4

Claims (2)

[Claims] (1) In a wave energy conversion device equipped with a chamber that is underwater and is provided with an opening facing the arrival of waves and an upper opening that generates an air flow and is connected with an air dark,
A dividing plate that divides the chamber into a plurality of parts in the depth direction so that spaces above the water surface are isolated from each other and communicated with each other underwater, and a plurality of air ducts that are respectively connected to the upper openings of the isolated spaces. A wave-crab inertia conversion device with a characteristic of being equipped with. (2) The wave energy conversion device according to claim 7, wherein the air duct is arranged concentrically in the driven equipment section.