JP2021134680A - Water-inducing current power generator - Google Patents

Abstract

[Problem] To provide an induced water type tidal current power generation device with excellent cost performance. [Solution] A duct 2 arranged along tidal currents T1 and T2, a power generation turbine 3 arranged inside the duct 2, and a water inducer that increases the flow rate of seawater, which is a working fluid, flowing inside the duct 2. This is an induced water tidal current power generation device 1 including a device 4. The duct 2 includes a central pipe 2a disposed around the power generation turbine 3, and a pair of reduced diameter pipes 2A disposed on both sides of the central pipe 2a in the tidal direction and whose inner diameter gradually decreases toward the central pipe 2a. I'm here. The water induction device 3 includes an input section 5 arranged outside the duct 2 and rotated by the tidal currents T1 and T2, and a water induction section 6 rotated by the input section 5 and attracting seawater to the inside of the duct 2. There is. The water induction part 6 is arranged inside the diameter-reduced pipe 2A. [Selection diagram] Figure 1

Description

The present invention relates to a water-inducing current current power generation device.

In recent years, international efforts have been discussed to reduce carbon dioxide emissions. In Japan as well, various tidal current power generation devices that generate electricity using tidal currents, which are renewable ocean energy, have been proposed. For example, Patent Document 1 below provides a tidal current power generator capable of rotating a turbine in the same direction regardless of whether the tidal current flows in the first direction or in the second direction opposite to the first direction with a simple structure. is suggesting.

Japanese Patent No. 6148803

However, in general, there is a problem that tidal current power generation that obtains good cost performance cannot be performed at the tidal current flow velocity. For this reason, tidal current power generation in Japan has not yet reached the stage of practical use, and a tidal current power generation device capable of generating power more effectively has been desired.

The present invention has been devised in view of the above circumstances, and a main object of the present invention is to provide a water-inducing current power generation device having excellent cost performance.

The present invention is a water-inducing tidal current power generation device, in which a duct arranged along the tidal current, a power generation turbine arranged inside the duct, and a flow rate of seawater which is a working fluid flowing inside the duct. The duct is arranged on both sides of the central pipe arranged around the power generation turbine and the central pipe in the tidal current direction, and the inner diameter gradually decreases toward the central pipe. The water attracting device includes a pair of reduced diameter pipes, and the water attracting device includes an input portion arranged outside the duct and rotated by the tidal current, and an attracting portion rotating by the input portion and attracting the seawater inside the duct. The water attracting part includes a water part, and the water attracting part is arranged inside the reduced diameter pipe.

In the water-inducing current power generation device of the present invention, it is desirable that the water-inducing device includes a transmission unit that transmits the rotation of the input unit to the water-inducing unit.

In the water-inducing current power generation device of the present invention, it is desirable that the transmission unit includes a speed-increasing mechanism that accelerates and transmits the rotation of the input unit.

In the water-inducing tidal current power generation device of the present invention, it is desirable that the input unit includes a plurality of turbines, and the water-inducing unit includes a propeller that attracts the seawater.

In the water-inducing tidal current power generation device of the present invention, the diameter-reduced pipe includes a first diameter-reduced pipe arranged on one side of the central pipe and a second diameter-reduced pipe arranged on the other side of the central pipe. It is desirable that the water attracting device includes a first water attracting device arranged on the first diameter-reduced pipe side and a second water attracting device arranged on the second diameter-reduced pipe side.

In the water-inducing type tidal current power generation device of the present invention, the input unit includes a first input unit provided in the first water-inducing device and a second input unit provided in the second water-inducing device. It is desirable that the two input units are arranged at positions that do not interfere with the streamline of the tidal current with respect to the first input unit.

In the water-inducing type tidal current power generation device of the present invention, the water-inducing part includes a first water-inducing part provided in the first water-inducing device and a second water-inducing part provided in the second water-inducing device. It is desirable that the first water attracting portion is arranged inside the first reduced diameter pipe, and the second water attracting portion is arranged inside the second reduced diameter pipe.

The water-inducing tidal current power generation device of the present invention increases the flow rate of a duct arranged along the tidal current, a power generation turbine arranged inside the duct, and seawater which is a working fluid flowing inside the duct. The duct includes a water attracting device, a central pipe arranged around the power generation turbine, and a pair of contractions arranged on both sides of the central pipe in the tidal current direction and whose inner diameter gradually decreases toward the central pipe. The water attracting device includes an input portion arranged outside the duct and rotated by the tidal current, and a water attracting portion rotating by the input portion and attracting the seawater inside the duct. The water attracting portion is arranged inside the reduced diameter pipe.

Such a water attracting device can attract more seawater of the tidal current outside the duct to the inside of the duct by the water attracting portion arranged inside the reduced diameter pipe, so that the operation of flowing inside the duct can be performed. The flow rate of seawater, which is a fluid, can be increased. Therefore, the water-inducing tidal current power generation device of the present invention can effectively generate electricity by the tidal current and is excellent in cost performance.

It is sectional drawing which shows one Embodiment of the water-inducing type tidal current power generation apparatus of this invention. It is sectional drawing of the water-inducing type tidal current power generation apparatus. It is a partial cross-sectional perspective view of a water-inducing current power generation device. It is a front view of the water-injection type tidal current power generation device. It is a perspective view of the water-inducing type tidal current power generation device of another embodiment. It is a partial cross-sectional perspective view of the water-inducing current current power generation device of still another embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional side view showing the water-inducing type tidal current power generation device 1 of the present embodiment, and FIG. 2 is a cross-sectional plan view of the water-inducing type tidal current power generation device 1. FIG. 1 corresponds to a cross-sectional view taken along the line AA of FIG. 2, and FIG. 2 corresponds to a cross-sectional view taken along the line BB of FIG. Further, FIG. 3 is a partial cross-sectional perspective view of the water-inducing current power generation device 1.

As shown in FIGS. 1 to 3, the water-inducing current power generation device 1 (hereinafter, may be simply referred to as “tidal current power generation device 1”) has a tidal current T1 in the first direction and a first tidal current, depending on the time. It is desirable to install it near the seabed where the tidal current T2 in the second direction opposite to the one direction flows. Here, the first direction and the second direction are the directions of the tidal currents T1 and T2 at high tide and low tide, respectively.

The tidal current power generation device 1 of the present embodiment includes a duct 2 arranged along the tidal currents T1 and T2, and a power generation turbine 3 arranged inside the duct 2. The tidal current power generation device 1 of the present embodiment further includes a water attracting device 4 for increasing the flow rates of the water flows T3 and T4 by seawater which is a working fluid flowing inside the duct 2.

The duct 2 includes a central pipe 2a arranged around the power generation turbine 3 and a pair of reduced diameter pipes 2A arranged on both sides of the central pipe 2a in the tidal current direction and whose inner diameter gradually decreases toward the central pipe 2a. Is desirable.

The water attracting device 4 of the present embodiment has an input unit 5 arranged outside the duct 2 and rotated by the tidal currents T1 and T2, and a water attracting unit 6 rotating by the input unit 5 and attracting seawater inside the duct 2. And include. It is desirable that the water attracting portion 6 is arranged inside the reduced diameter pipe 2A. Since such a water attracting portion 6 is arranged inside the reduced diameter pipe 2A, more seawater in the tidal currents T1 and T2 outside the duct 2 can be attracted to the inside of the duct 2.

Such a water attracting device 4 increases the flow rates of the water streams T3 and T4 by the seawater which is the working fluid flowing inside the duct 2 by the water attracting action of the water attracting portion 6 arranged inside the reduced diameter pipe 2A. be able to. As a result, the water attracting device 4 of the present embodiment can increase the flow velocity of the water flows T3 and T4, and can increase the water flow energy for rotating the power generation turbine 3. Therefore, the tidal current power generation device 1 of the present embodiment can effectively generate power with the tidal currents T1 and T2, and is excellent in cost performance.

Here, the diameter-reduced pipe 2A located on the upstream side of the tidal currents T1 and T2 generally has a characteristic of inhibiting the water flow T3 and T4 of the seawater flowing into the inside of the diameter-reduced pipe 2A. This is because the water flows T3 and T4 flowing inside the reduced diameter pipes 2A located on the upstream side of the tidal currents T1 and T2 do not flow evenly in a laminar flow state, but are turbulent along the inner wall surface of the reduced diameter pipes 2A. This is because the flow of water flows T3 and T4 is obstructed by generating a flow or a vortex flow. Therefore, in general, in the tidal currents T1 and T2, only the portion corresponding to the opening cross section of the central pipe 2a flows smoothly, and most of the rest overflows to the outside of the reduced diameter pipe 2A on the upstream side.

On the other hand, the water attracting device 4 of the present embodiment eliminates the characteristic of obstructing the water flows T3 and T4, increases the flow rate of the water flows T3 and T4 by the seawater which is the working fluid flowing inside the duct 2, and is used for power generation. It increases the output of the turbine 3.

The water attracting portion 6 of the present embodiment suppresses the generation of turbulent flow and vortex flow that obstruct the water flows T3 and T4 of seawater by the action of the propeller 9 described later, and overflows to the outside of the reduced diameter pipe 2A on the upstream side so far. It is possible to exert a water-inducing action of attracting the tidal currents T1 and T2 that have been emitted to the inside of the duct 2. Therefore, the tidal current power generation device 1 of the present embodiment can increase the flow rates of the water flows T3 and T4 by the seawater as the working fluid, and can improve the cost performance of the entire device.

At this time, the reduced diameter pipe 2A located on the downstream side of the tidal currents T1 and T2 functions as a diffuser, and is arranged inside the reduced diameter pipe 2A on the upstream side together with the water attracting portion 6 arranged inside the diffuser. It is possible to assist the water attracting action by the water attracting unit 6. Here, the pair of reduced diameter pipes 2A arranged on both sides in the tidal current direction alternately alternate between the upstream side and the downstream side as the tidal currents T1 and T2 change. Therefore, the above-mentioned water attracting action can be performed without delay regardless of the ebb and flow of the tidal currents T1 and T2.

In a more preferred embodiment, the reduced diameter tube 2A includes a first reduced diameter tube 2b arranged on one side of the central tube 2a and a second reduced diameter tube 2c arranged on the other side of the central tube 2a. .. The inner diameters of the first reduced diameter pipe 2b and the second reduced diameter pipe 2c of the present embodiment are gradually reduced toward the central pipe 2a, respectively. Such a duct 2 is useful for increasing the flow rates of the water streams T3 and T4 due to the seawater flowing inside the central canal 2a and increasing the flow velocity due to the diffuser effect on the downstream side of the central canal 2a.

The duct 2 has, for example, flange portions 2d protruding toward the outside of the duct 2 at the end portions 2e on both sides in the tidal current direction. It is desirable that the flange portion 2d is folded on the upstream side of the tidal currents T1 and T2 and deployed on the downstream side. Such a flange portion 2d can further improve the diffuser effect on the downstream side of the tidal currents T1 and T2.

It is desirable that the pitch angle of each blade of the power generation turbine 3 can be changed so that the power generation turbine 3 can rotate in the same direction in both the tidal current T1 in the first direction and the tidal current T2 in the second direction. The power generation turbine 3 is connected to, for example, a generator (not shown) arranged inside or outside the duct 2. Such a power generation turbine 3 is useful for effective power generation at low cost.

The water attracting device 4 of the present embodiment further includes a transmitting unit 7 that transmits the rotation of the input unit 5 to the water attracting unit 6. The transmission unit 7 of the present embodiment mechanically transmits by a shaft 10 and a gear mechanism 11 described later. The transmission unit 7 may be, for example, one that transmits electrically, or one that transmits by hydraulic pressure such as hydraulic pressure.

It is desirable that the water attracting device 4 includes a first water attracting device 4A arranged on the first diameter-reduced pipe 2b side and a second water attracting device 4B arranged on the second diameter-reduced pipe 2c side. The first water attracting device 4A and the second water attracting device 4B of the present embodiment have an input unit 5, a water attracting unit 6, and a transmitting unit 7, respectively.

Since such a water attracting device 4 can act on the seawater flowing inside the central pipe 2a on the upstream side and the downstream side of the power generation turbine 3, the flow rates of the water flows T3 and T4 inside the central pipe 2a. Can be increased efficiently. Therefore, the tidal current power generation device 1 of the present embodiment can effectively generate electricity by the tidal currents T1 and T2, and can exhibit excellent cost performance.

FIG. 4 is a front view seen from the upstream side of the tidal current T1 of the present embodiment. As shown in FIGS. 1 to 4, the input unit 5 of the present embodiment includes a turbine 8 rotated by the tidal currents T1 and T2. The turbine 8 includes, for example, three blades 8a. The number of blades 8a of the turbine 8 is not limited to this, and may be, for example, two or four or more.

It is desirable that the pitch angle of each of the blades 8a of the turbine 8 can be changed. Such a turbine 8 can efficiently rotate in either the tidal current T1 in the first direction or the tidal current T2 in the second direction. The input unit 5 is not limited to the turbine 8, and may rotate in a fixed direction regardless of the directions of the tidal currents T1 and T2, such as the Darius turbine.

The water attracting portion 6 of the present embodiment includes a propeller 9 that attracts seawater of tidal currents T1 and T2. The propeller 9 includes, for example, four blades 9a. The number of blades 9a of the propeller 9 is not limited to this, and may be, for example, two or three, or five or more.

It is desirable that the pitch angle of each of the blades 9a of the propeller 9 can be changed. Such a propeller 9 can efficiently increase the flow rates of the water flows T3 and T4 inside the duct 2 by the water attracting action in both the tidal current T1 in the first direction and the tidal current T2 in the second direction.

The distance L1 from the end 2e of the duct 2 of the water attracting portion 6 is preferably 50% to 80% of the length L2 of the first reduced diameter pipe 2b or the second reduced diameter pipe 2c in the tidal current direction. Such a water attracting portion 6 is suitable for efficiently increasing the flow rates of the water streams T3 and T4 inside the central pipe 2a.

The input unit 5 includes a plurality of turbines 8 in this embodiment. The water attracting unit 6 of the present embodiment includes one propeller 9 that attracts seawater. Since such an input unit 5 and a water attracting unit 6 can rotate the propeller 9 by combining the energies of the plurality of turbines 8, the flow rates of the water flows T3 and T4 inside the central pipe 2a can be efficiently increased. Can be done. The number of turbines 8 and propellers 9 is not limited to this, and any number can be appropriately adopted, but it is desirable that the number of turbines 8 is larger than the number of propellers 9.

It is desirable that the diameter D1 of the turbine 8 is larger than the diameter D2 of the propeller 9. The rotating area S1 of the turbine 8 in this case is larger than the rotating area S2 of the propeller 9. In such a water attracting device 4, a large amount of energy can be taken in by the turbine 8 on the input side, and the flow rates of the water flows T3 and T4 inside the central pipe 2a can be efficiently increased.

It is desirable that the transmission unit 7 includes a shaft 10 and a gear mechanism 11 that mechanically transmit the rotation of the turbine 8 of the input unit 5 to the propeller 9 of the water attracting unit 6. Such a transmission unit 7 has good transmission efficiency, and can reduce energy loss when transmitting the rotation of the input unit 5 to the water attracting unit 6.

The gear mechanism 11 of the transmission unit 7 has, for example, a bevel mechanism 11a that changes the direction of the rotation shaft of the input unit 5 from the turbine 8 and transmits the rotation, and an increase that accelerates and transmits the rotation of the turbine 8 of the input unit 5. It includes a speed mechanism 11b. The gear mechanism 11 of the present embodiment includes four bevel mechanisms 11a and one speed increasing mechanism 11b. Such a gear mechanism 11 can accelerate the rotation of the turbine 8 and transmit it to the propeller 9. The shaft 10 is suitable for connecting between the plurality of bevel mechanisms 11a and the speed increasing mechanism 11b. When the transmission unit 7 transmits by electrical or hydraulic pressure, it is desirable to include a speed-increasing mechanism different from the one shown in the drawing.

The speed-up rate n of the speed-increasing mechanism 11b is defined by, for example, the sum of the rotating areas S1 of the turbine 8 of the input unit 5 and the rotating area S2 of the propeller 9 of the water attracting unit 6. Here, the total rotation area S1 of the turbine 8 of the input unit 5 is obtained as the product of the rotation area S1 of the turbine 8 and the number of turbines 8, and corresponds to 2 × S1 in the present embodiment.

It is desirable that the speed increase rate n of the speed increase mechanism 11b is larger than the cube root of the ratio of the total (2 × S1) of the rotation area S1 of the turbine 8 to the rotation area S2 of the propeller 9. That is, the speed increase rate n of the speed increase mechanism 11b of the present embodiment satisfies the following equation 1.

In the water attracting device 4 of the present embodiment, the rotations of the two turbines 8 are input to the bevel mechanism 11a, respectively. It is desirable that the rotations converted in the direction orthogonal to the tidal current direction by the bevel mechanism 11a are merged by the central bevel mechanism 11a via the shaft 10 extending in the width direction. The merged rotation is input to the bevel mechanism 11a provided on the rotation shaft of the propeller 9 via the shaft 10 extending downward and the speed increasing mechanism 11b. In such a water attracting device 4, the number of shafts 10 crossing the duct 2 is small, and the resistance of seawater attracted to the inside of the duct 2 can be reduced.

The input unit 5 of the present embodiment includes a first input unit 5A provided in the first water attracting device 4A and a second input unit 5B provided in the second water attracting device 4B. Further, the water attracting part 6 of the present embodiment includes a first water attracting part 6A provided in the first water attracting device 4A and a second water attracting part 6B provided in the second water attracting device 4B. Further, the transmission unit 7 of the present embodiment includes a first transmission unit 7A provided in the first water attracting device 4A and a second transmission unit 7B provided in the second water attracting device 4B.

That is, the first water attracting device 4A of the present embodiment includes a first input unit 5A that is rotated by the tidal currents T1 and T2 outside the duct 2, a first water attracting unit 6A that attracts seawater to the inside of the duct 2. It has a first transmission unit 7A that transmits the rotation of the first input unit 5A to the first water attraction unit 6A. Further, the second water attracting device 4B of the present embodiment includes a second input part 5B that is rotated by the tidal currents T1 and T2 outside the duct 2, a second water attracting part 6B that attracts seawater to the inside of the duct 2. It has a second transmission unit 7B that transmits the rotation of the second input unit 5B to the second water attraction unit 6B.

It is desirable that the second input unit 5B is arranged at a position that does not interfere with the streamlines of the tidal currents T1 and T2 with respect to the first input unit 5A. In such an input unit 5, the disturbance of T1 and T2 by the input unit 5 located on the upstream side of the tidal currents T1 and T2 does not affect the input unit 5 located on the downstream side. Therefore, the water attracting device 4 of the present embodiment can efficiently rotate both the input units 5 on the upstream side and the downstream side of the tidal currents T1 and T2.

It is desirable that the first water attracting portion 6A is arranged inside the first reduced diameter pipe 2b. The distance L1 of the first water attracting portion 6A from the end 2e of the first reduced diameter pipe 2b is preferably 50% to 80% of the length L2 of the first reduced diameter pipe 2b in the tidal current direction. It is desirable that the second water attracting portion 6B is arranged inside the second reduced diameter pipe 2c. The distance L1 of the second water attracting portion 6B from the end 2e of the second reduced diameter pipe 2c is preferably 50% to 80% of the length L2 of the second reduced diameter pipe 2c in the tidal current direction. Such a first water attracting part 6A and a second water attracting part 6B are suitable for efficiently increasing the flow rates of the water streams T3 and T4 inside the central pipe 2a.

The tidal current power generation device 1 of the present embodiment is installed on the seabed via a base 12. Such a tidal current power generation device 1 can easily fix the position and can perform planned power generation. The position of the base 12 may be securely fixed by inserting a fixture (not shown) into the seabed, for example.

FIG. 5 is a perspective view of the water-inducing current power generation device 20 of another embodiment. Elements having the same functions as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted. As shown in FIG. 5, the water-inducing type tidal current power generation device 20 of this embodiment includes a duct 2 arranged along the tidal currents T1 and T2, and a water flow T3 by seawater which is a working fluid flowing inside the duct 2. It includes at least a water attracting device 21 that increases the flow rate of T4.

The water attracting device 21 of this embodiment attracts the rotation of the input unit 5 that is rotated by the tidal currents T1 and T2 outside the duct 2, the water attracting unit 6 that attracts seawater to the inside of the duct 2, and the rotation of the input unit 5. It has a transmission unit 22 that transmits to the unit 6.

In such a water-inducing type tidal current power generation device 20, more seawater in the tidal currents T1 and T2 outside the duct 2 can be attracted to the inside of the duct 2 by the water-inducing unit 6, so that the water flows inside the duct 2. It is possible to increase the flow rates of the water streams T3 and T4 by the seawater which is the working fluid. Therefore, the water-inducing tidal current power generation device 20 of this embodiment can effectively generate electricity at the tidal currents T1 and T2, and is excellent in cost performance.

The transmission unit 22 preferably includes a shaft 10 and a gear mechanism 23 that mechanically transmit the rotation of the turbine 8 to the propeller 9. The gear mechanism 23 of this embodiment has a bevel function for converting and transmitting the direction of the rotation shaft from the turbine 8 and a speed increasing function for accelerating and transmitting the rotation of the turbine 8. Such a transmission unit 22 can reduce the number of gear mechanisms 23, and can further reduce the energy loss when transmitting the rotation of the input unit 5 to the water attracting unit 6.

In the water attracting device 21 of this embodiment, the rotations of the two turbines 8 are input to the gear mechanism 23, respectively. It is desirable that the rotations converted in the direction orthogonal to the tidal current direction by the gear mechanism 23 are merged by the gear mechanism 23 provided on the rotation shaft of the propeller 9 via the shaft 10 extending obliquely in the width direction.

The speed increase of rotation may be performed by, for example, the gear mechanism 23 on the turbine 8 side or the gear mechanism 23 on the propeller 9 side. Further, both of the two gear mechanisms 23 may have a speed increasing function. In such a water attracting device 21, the number of gear mechanisms 23 can be reduced, and the energy loss when transmitting the rotation of the input unit 5 to the water attracting unit 6 can be further reduced.

FIG. 6 is a perspective view of the water-inducing current power generation device 30 of still another embodiment. Elements having the same functions as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted. As shown in FIG. 6, the water-inducing type tidal current power generation device 30 of this embodiment includes a duct 31 arranged along the tidal currents T1 and T2, and a water flow T3 by seawater which is a working fluid flowing inside the duct 31. It includes at least a water attracting device 32 that increases the flow rate of T4.

The water attracting device 32 of this embodiment attracts the rotation of the input unit 5 that is rotated by the tidal currents T1 and T2 outside the duct 31, the water attracting unit 6 that attracts seawater to the inside of the duct 31, and the rotation of the input unit 5. It has a transmission unit 33 that transmits to the unit 6.

In such a water-inducing type tidal current power generation device 30, the water-inducing portion 6 can attract more seawater in the tidal currents T1 and T2 outside the duct 31 to the inside of the duct 31, so that the water flows inside the duct 31. It is possible to increase the flow rates of the water streams T3 and T4 by the seawater which is the working fluid. Therefore, the water-inducing tidal current power generation device 30 of this embodiment can effectively generate electricity at the tidal currents T1 and T2, and is excellent in cost performance.

The duct 31 of this embodiment has a support member 31a that supports the turbine 8 of the input unit 5. The transmission unit 33 preferably includes a shaft 34 and a gear mechanism 35 that mechanically transmit the rotation of the turbine 8 to the propeller 9. The shaft 34 of this embodiment is arranged inside the support member 31a. Such a water attracting device 32 can reduce the transmission unit 33 in contact with the tidal currents T1 and T2, and is suitable for efficiently increasing the flow rates of the water streams T3 and T4.

The gear mechanism 35 of this embodiment has a bevel function for converting and transmitting the direction of the rotation shaft from the turbine 8 and a speed increasing function for accelerating and transmitting the rotation of the turbine 8. It is desirable that at least a part of the gear mechanism 35 is arranged inside the support member 31a. Such a transmission unit 33 can reduce the number of gear mechanisms 35, and can further reduce the energy loss when transmitting the rotation of the input unit 5 to the water attracting unit 6.

Although the particularly preferable embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and can be modified into various embodiments.

1 Tidal current power generation device 2 Duct 2a Central pipe 2A Reduced diameter pipe 3 Power generation turbine 4 Water attractor 5 Input part 6 Water attraction part

Claims (7)

It is a water-inducing current power generator
It includes a duct arranged along the tidal current, a power generation turbine arranged inside the duct, and a water attracting device for increasing the flow rate of seawater which is a working fluid flowing inside the duct.
The duct includes a central pipe arranged around the power generation turbine and a pair of reduced diameter pipes arranged on both sides of the central pipe in the tidal current direction and whose inner diameter gradually decreases toward the central pipe.
The water attracting device includes an input portion arranged outside the duct and rotated by the tidal current, and a water attracting portion rotating by the input portion and attracting the seawater inside the duct.
The water attracting portion is arranged inside the reduced diameter pipe.
Water-inducing current power generator. The water-inducing current power generation device according to claim 1, wherein the water-inducing device includes a transmission unit that transmits the rotation of the input unit to the water-inducing unit. The water-inducing current power generation device according to claim 2, wherein the transmission unit includes a speed-increasing mechanism that accelerates and transmits the rotation of the input unit. The input section includes a plurality of turbines and includes a plurality of turbines.
The water attracting type tidal current power generation device according to any one of claims 1 to 3, wherein the water attracting unit includes a propeller that attracts seawater. The diameter-reduced tube includes a first-diameter tube arranged on one side of the central tube and a second-diameter tube arranged on the other side of the central tube.
3. The water-inducing tidal current power generation device according to any one of the items. The input unit includes a first input unit provided in the first water attracting device and a second input unit provided in the second water attracting device.
The water-inducing tidal current power generation device according to claim 5, wherein the second input unit is arranged at a position that does not interfere with the streamline of the tidal current with respect to the first input unit. The water attracting part includes a first water attracting part provided in the first water attracting device and a second water attracting part provided in the second water attracting device.
The first water attracting portion is arranged inside the first reduced diameter pipe, and is arranged inside the first reduced diameter pipe.
The water-inducing current power generation device according to claim 5 or 6, wherein the second water-inducing unit is arranged inside the second-diameter pipe.

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