JP2014181588A - Wave power generation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wave power generation device which efficiently uses wave force of surf wave and drawback wave.SOLUTION: A wave power generation device 1 comprises: a watermill 3 which has a bucket-shaped water receiver with a concave front surface and a convex back surface and rotates by receiving surf wave on the upper side than a rotation shaft and by receiving drawback wave on the lower side than the rotation shaft; a power generation motor which generates power by rotation of the watermill 3; a suction port 4 which collects surrounding waves including the lower side than the rotation shaft of the watermill 3 and guides the wave to the rotation shaft upper side; a port for drawback wave provided on the lower side of the suction port 4; and a frame which is provided with the watermill 3, the power generation motor, the suction port and the port for drawback wave, and is installed on the sea bottom. The wave power generation device 1 is installed on the sea bottom in such an installation condition that a valley of wave-height when being changed from surf wave to drawback wave is located on a position of the suction port lower edge. In the wave power generation device 1, while water level rises by means of the surf wave and water level falls by means of drawback wave, the watermill 3 rotates in the same direction and can extremely efficiently perform power generation by means of a power generation motor.

Description

  The present invention relates to a wave power generation device that generates power using wave force (called wave force), and more particularly, to a wave power generation device that generates power using a reciprocating wave that strikes and pulls at the time of waving.

  Conventionally, a wave receiving plate that is pivotally supported on a table provided at a position on the wave, and reciprocates by a force that is obtained by a pulling wave that strikes the coast and a pulling wave that returns to the offshore, A power generation system that generates power by movement of a wave receiving plate is known (for example, Patent Document 1).

JP 2010-25096 A

  The power generation system described in Patent Document 1 generates power by reciprocating a permanent magnet inserted in a coil by a wave receiving plate.

  However, in the power generation system, the permanent magnet also reciprocates once by one reciprocation of the wave, and the amount of power generation generated by the electromagnetic induction action is extremely small. Thus, the conventional power generation system cannot use wave power effectively.

  The present invention has been made to solve the above-described problems of the conventional example, and an object of the present invention is to provide a power generation system that generates power more efficiently by using a rush wave and a pulling wave that strike the coast.

  In order to achieve the above object, the present invention provides a wave power generator that is installed on the seabed of a coast and generates power by using the force of a slashing wave that strikes the coast and a pulling wave that the struck wave pulls offshore. A rotating turbine having a rotating shaft in a direction intersecting with the traveling direction of the wave, rotating in response to a near wave passing above the rotating shaft and a pulling wave passing below the rotating shaft, and to rotating the turbine A power generation motor connected to the rotating shaft of the water turbine so as to generate electric power by rotating in conjunction, and a near wave in a predetermined height range from the lower side of the rotating shaft of the water wheel to the upper side of the upper end of the water wheel And a suction port that leads between an upper side of the rotation axis of the water wheel and an upper end of the water wheel, and a lower side of the suction port, and passes a pulling wave that passes below the rotation axis of the water wheel. Mouth for drawing wave, rotating shaft, motor for power generation and suction A frame for holding a mouth and for installing a wave power generation device on the seabed, wherein the water wheel has a plurality of water wheels provided radially on the rotating shaft, and each water wheel has the rotating shaft. It has a saddle shape extending in the direction, the surface is concave when viewed from the traveling direction of the wave, and the back side is convex, and the frame has a trough height of the wave height when changing from a pulling wave to a near wave. It is characterized in that it is installed on the seabed under the installation condition that is the lower end position of the suction port.

  Preferably, a guide plate is provided that covers the outer periphery of the water turbine so that a rushing wave passing immediately above the rotation axis of the water turbine flows along the rotation direction of the water wheel.

  Preferably, the water receiver has a shape obtained by cutting a hollow cylinder in half along the axis of the cylinder.

  Preferably, a gear transmission for increasing the rotation speed of the rotating shaft is disposed at both ends of the rotating shaft of the water wheel, and two power generation motors are disposed above the gear transmissions on both sides.

  Preferably, the suction port has a hollow quadrangular frustum shape.

  In the wave power generation system according to the present invention, a plurality of the power generation apparatuses described in any one of the above may satisfy the grounding condition at a plurality of predetermined sea level heights within a range of sea level heights that change due to tides. Thus, it is provided with changing the distance from the coast, and includes a control unit that collectively outputs the power generated by the plurality of wave power generation devices.

  In the wave power generation device according to the present invention, the force received from the wave on the concave front side of the water wheel of the water turbine is the force received from the wave on the convex back side of the water receiver located on the opposite side across the rotating shaft. Stronger than. The turbine is rotated by receiving both the force of the approaching wave and the pulling wave coming through the suction port from the direction intersecting the rotation axis, and rotates the power generation motor connected to generate power very efficiently.

  In the power generation system according to the present invention, a plurality of wave power generators are installed at different distances from the coast in consideration of tides, and outputs from each wave power generator are combined into one output. By doing so, it is possible to generate electricity without being affected by tides.

The perspective view which looked at the wave power generator concerning one embodiment of the present invention from the front. The perspective view which looked at the same wave power generator from back. The AA 'arrow directional view of the perspective view shown in FIG. 1 of the wave power generation device. The right view of the same wave power generator. The front view of the same wave power generation device. The rear view of the same wave power generation device. B-B 'sectional drawing of the perspective view shown in FIG. 1 of the same wave power generator. The perspective view which shows the connection state of the water wheel of the same wave power generator, the gear reducer, and the motor for electric power generation. (A) is sectional drawing which shows a mode when the same wave power generation device installed in the seabed near a coast receives a rushing wave, (b) is sectional drawing which shows a mode in the case of receiving a pulling wave. The side view which shows the mode of the watermill in the case of receiving uniform wave power on the whole surface. The block diagram of the wave power generation system using the two wave power generation devices arrange | positioned on the seabed changing the distance from the coast.

  The wave power generation device according to the present invention has a bowl-shaped water receiver, receives a squeezing wave on the upper side of the rotation shaft, receives a pulling wave on the lower side, and rotates to generate power by rotating the water wheel. A suction port that collects surrounding waves including the lower side of the rotating shaft and guides it to the upper side of the rotating shaft, an inlet for a pulling wave that passes the pulling wave to the lower side of the rotating shaft, the water turbine, the power generation unit, the suction port, and And a frame installed on the seabed of the coast. The pulling mouth is provided below the suction port. The wave power generator is installed on the seabed under the installation conditions in which the valley of the wave height when the wave changes from the pulling wave to the spilling wave is the position of the lower end of the suction port. In the wave power generation device having the above-described configuration, the water turbine rotates in the same direction while the water level rises due to the rush wave and the water level decreases due to the pulling wave, and power generation by the power generation motor can be performed very efficiently.

  In addition, it is preferable to provide the guide plate which covers the outer periphery of a water turbine so that the approaching wave which passed right above the rotating shaft of the water turbine flows along the rotation direction of a water turbine. The guide plate increases the force to rotate the turbine by the spilling wave, and guides the pulling wave to the outside of the guide plate to prevent the turbine from rotating. Rotate.

  1 and 2 show a state in which a wave power generation device 1 according to an embodiment of the present invention is installed on a seabed 20 on a coast. The wave power generation device 1 has a main frame 2 in which a part of the lower side is embedded and fixed to the seabed 20. The main frame 2 includes a water wheel 3, a suction port 4 that collects a spilled wave or seawater and applies it to the water wheel 3, gear transmissions 5 a and 5 b, and a power generation unit 6 connected to the gear transmissions 5 a and 5 b. Have.

  The main frame 2 has a table-like frame structure composed of a plurality of horizontal beams including four columns 2a to 2d provided at four corners and horizontal beams 2e to 2h connecting the four columns. ing. The water turbine 3 is attached to the middle height of the main frame 2. The gear transmissions 5 a and 5 b are connected to the water turbine 3 and the power generation unit 6, and accelerate the rotation of the water wheel 3 and transmit it to the power generation unit 6.

  In one embodiment of the wave power generation device 1, the main frame 2 has a total length in the vertical direction and a width in a direction orthogonal to the wave traveling direction, and a depth along the wave traveling direction is approximately 1 m. 1 and 2 show a state in which the sea surface is at the height of an opening portion where the suction port 4 discharges a spilling wave toward the water turbine 3 side.

  In the main frame 2, two auxiliary supports 2 i and 2 j for fixing the device 1 to the sea floor on the opposite side of the suction port 4, and the approaching wave that has passed right above the rotation axis of the water turbine 3 A guide plate 7 covering the outer periphery of the water turbine 3 is attached so as to flow along. From the power generation unit 6, an electric wire 6a that outputs the generated electricity extends to the land.

  The wave power generator 1 is fixed by embedding a main frame 2 and auxiliary supports 2i and 2j on the seabed 20 of the coast. Depending on the state of the seabed, the length of the portion embedded in the coast of the frame 2 and the auxiliary supports 2i and 2j may be extended by, for example, 1 m to 3 m in order to fix the wave power generator 1 more reliably. Alternatively, the wave power generation device may be fixed to the seabed by attaching the lower ends of the frame 2 and the auxiliary supports 2i and 2j to a concrete pedestal and then burying the pedestal on the seabed. If the auxiliary supports 2i and 2j can be securely fixed without the auxiliary supports 2i and 2j, the auxiliary supports 2i and 2j may be omitted.

  3 to 7 show each component of the wave power generation device 1. In addition, in order to show each component more clearly, depiction of the sea surface is omitted in FIGS.

  As shown in FIG. 3, the water wheel 3 is composed of a rotating shaft 3a and six water receptacles 3b attached radially to the rotating shaft 3a. The water receiver 3b has a bowl shape that is concave on the front side and convex on the back side (see FIG. 8). The convex portion on the back surface of the water receiver 3b has a smooth surface with a small surface resistance so that the force received from the waves is smaller than that on the front side, and flows around without receiving the hit seawater. By adopting this configuration, the water turbine 3 rotates in a clockwise direction by receiving a squeezing wave on the upper side of the rotating shaft 3a and receiving a pulling wave on the lower side. The distance between the suction port 4 and the water turbine 3 is set to a value at which the near wave collected and discharged by the suction port 4 efficiently hits the upper side of the rotating shaft 3a of the water turbine 3.

  The upper end of the guide plate 7 is connected to the bottom surface of the power generation unit 6. When the guide plate 7 is centered on the rotation shaft 5f of the gear 5c, the lower end is provided at a position approximately the same distance from the rotation shaft 5f to the upper end of the guide plate 7 in the direction of about 2 o'clock. . The lower end of the guide plate 7 may extend to the vicinity of the rotating shaft 3 a of the water wheel 3, and the shape of the guide plate 7 may be curved along the outer periphery of the water wheel 3. The guide plate 7 extends the stroke that acts on the water receiver 3b so that the wake wave rotates the water wheel 3 clockwise. Further, the guide plate 7 guides the pulling wave to the outside of the guide plate 7, that is, the upper side of the water wheel 3, reduces the amount of the pulling wave that tries to rotate the water wheel 3 counterclockwise, and makes the water wheel 3 more efficient. Rotate.

  As shown in FIG. 4, the gear transmission 5a is composed of three gears 5c, 5d, and 5e. The rotation shaft 5f of the gear 5c is connected to the rotation shaft 3a (see FIG. 3) of the water turbine 3. The gear transmission 5b (see FIG. 2) has the same configuration as the gear transmission 5a.

  As shown in FIGS. 3 and 5, the suction port 4 is formed by attaching trapezoidal plates 4 b to 4 e to a rectangular frame 4 a (see FIG. 1) attached to the front surface of the main frame 2, and having a hollow inner surface. This is a structure configured to have a truncated pyramid shape. The suction port 4 further includes a rectangular plate 4f attached between the frame 4a and the main frame 2. The lower end of the suction port 4, that is, the lower end of the trapezoidal plate 4 c, immediately after the wave is changed from the pulling wave to the near wave, the force that the near wave pushes the water receiver 3 b above the rotation shaft 3 a is below the rotation shaft 3 a It is positioned below the rotary shaft 3a so that the water wheel 3 can be rotated and the water wheel 3 can be rotated. The upper end of the suction port 4, that is, the upper end of the trapezoidal plate 4 e is located above the upper end of the water receiver 3 b of the water turbine 3, for example, at the height of the power generation unit 6. By adopting this configuration, the suction port 4 collects a spilling wave around the water wheel 3 and guides it to the upper side of the rotating shaft 3a. On the lower side of the suction port 4, there is provided a pulling wave port 8 through which a pulling wave passing below the rotating shaft 3 a is passed. The wave inlet 8 indicates a portion defined between the two support columns 2 a and 2 d on the front side of the main frame 2, the lower side of the trapezoidal plate 4 c of the suction port 4, and the seabed 20.

  As shown in FIG. 6, the power generation unit 6 includes two power generation motors (permanent magnets) that project the shafts 6 d and 6 e of the coupling rotor in the opposite direction from the container in a waterproofed container. Type synchronous motor) 6b, 6c. As shown in FIGS. 3 and 6, each of the power generation motors 6b and 6c has an electric wire 6a that outputs the generated power to the outside.

  FIG. 7 shows a cross section of the wave power generation device 1. The main frame 2 has a symmetrical configuration. Two identical gear transmissions 5 a and 5 b are connected to both ends of the rotating shaft 3 a of the water turbine 3. The two gear transmissions 5a and 5b are connected to the rotor shafts 6d and 6e of the two power generation motors 6b and 6c of the power generation unit 6 disposed above.

  FIG. 8 shows a connected state of the water wheel 3, the gear transmission 5 a, and the power generation motor 6 b of the wave power generation device 1. The water receiver 3b of the water wheel 3 has a bowl shape obtained by cutting a hollow cylinder in half along the axis of the cylinder. By adopting this shape, the convex portion on the back surface of the water receiver 3b has low surface resistance, and the hit seawater can be efficiently flowed around.

  The gear transmission 5a connects the water wheel 3 and the shaft 6d of the power generation motor 6c by three gears 5c, 5d, and 5e. The rotation shaft 5g of the gear 5c is connected to the rotation shaft 3a of the water wheel 3 on the same axis. The teeth 5h of the gear 5c mesh with the teeth provided on the rotation shaft 5i of the gear 5d. The teeth 5j of the gear 5d mesh with the teeth provided on the rotation shaft 5k of the gear 5e. The teeth 5l of the gear 5e mesh with the teeth provided on the shaft 6d of the power generation motor 6b. With this configuration, the gear transmission 5a increases the rotation of the water turbine 3 and transmits it to the shaft 6d. As for the number of gears used in the gear transmissions 5a and 5b and the gear ratio of each gear, the force of the approaching and pulling waves obtained at the place where the wave power generator 1 is installed and the shaft 6d are rotated. The shaft 6d is set to a value that can be stably rotated based on the force required for the rotation.

  FIG. 9 shows the principle of rotation of the water wheel 3 when the entire surface is subjected to waves. Consider a case where two water receptacles 3b positioned with the rotary shaft 3a interposed therebetween receive a wave of uniform force from the left side to the right side in the direction intersecting the rotary shaft 3a. As indicated by arrows 9a to 9f, the concave portion on the front side of the water receiver 3b on the upper side receives the force from the waves, whereas the convex portion on the back surface of the water receiver 3b on the lower side is from the waves. Because it flows around without receiving the force, the force received from the wave is weak. As a result, the water turbine 3 rotates in the clockwise direction indicated by the arrow 9g, and stops when the forces received by the upper and lower water receivers 3b from the waves are balanced. In the actual water turbine 3, the water receivers 3b are provided radially at intervals of 60 degrees, and the force to rotate the water turbine 3 acts on the water receivers 3b positioned on the upper side one after another, so that the water turbine 3 rotates. To do.

  FIG. 10 shows the wave power generation apparatus 1 installed on the seabed as an embodiment under the installation conditions in which the valley height of the wave height when changing from a pulling wave to a near wave is the position of the lower end of the suction port 4. As shown in FIG. 10 (a), the water level rises from Pa to Pb during the rushing wave. The approaching wave collected by the suction port 4 so as to hit the water receiver 3b above the rotating shaft 3a of the water wheel 3 passes above the rotating shaft 3a of the water wheel 3 as indicated by arrows 10a to 10c. Rotate clockwise. The approaching wave that has passed immediately above the rotation shaft 3a of the water turbine 3 flows along the rotation direction of the water turbine 3 by the action of the guide plate 7, and rotates the water turbine 3 more strongly. In addition, as indicated by an arrow 10d, there is a wave passing through the bottom of the wave power generation device 1 and the wave drawing port 8 in the near wave. However, due to the action of the suction port 4, the approaching wave located below the rotation shaft 3 a is lifted and applied to the water receiver 3 b at the upper part of the water turbine 3, so that the approaching wave hitting the back surface of the lower water receiver 3 b The amount is small. As the water level of the spilling waves rises, more spilling waves or seawater hits the water receiver 3b, so that the force to rotate the water turbine 3 in the clockwise direction wins, and the water turbine 3 rotates.

  As shown in FIG. 10 (b), when the spilling wave is changed to a pulling wave returning to the offshore, the water level falls from Pb to Pa. In the case of a pulling wave, the water turbine 3 is initially under the sea surface, and as indicated by arrows 11a to 11c, a pulling wave or a force from seawater acts on substantially the entire surface of the water wheel 3, and based on the principle described in FIG. The water wheel 3 rotates clockwise. Further, the guide plate 7 guides a pulling wave to be rotated counterclockwise toward the upper portion of the water turbine 3 to the upper side of the power generation unit 6 of the wave power generation device 1 as indicated by an arrow 11e. However, a large force acts to rotate the water turbine 3 clockwise. Further, as the water level is lowered, as shown by an arrow 11d, the pulling wave hitting the back side convex portion of the water receiver 3b on the upper side of the water wheel 3 is reduced. As a result, the water turbine 3 efficiently rotates clockwise during the pulling wave.

(Application examples)
FIG. 11 shows a power generation system 50 configured using a plurality of wave power generation devices according to the embodiment of the present invention. The power generation system 50 includes a plurality of (for example, two) wave power generation devices 1 and 31 and a control unit 40 that collectively outputs the power generated by the plurality of wave power generation devices 1 and 31. ing. The configuration of the wave power generator 31 is the same as that of the wave power generator 1.

  The wave power generators 1 and 31 have the height of the valley of the wave height when changing from the pulling wave to the spilling wave within the range of the sea level height (water level Pc to water level Pe) that changes due to the tide fullness. The distance from the coast is changed so as to satisfy the grounding condition at the lower end.

  The water level rises and falls as the tide fills with time. In order to generate power efficiently throughout the day, the two wave power generators 1 and 31 are installed at a plurality of predetermined sea level heights within a range of sea level heights that change due to tides. . More specifically, the first wave power generation device 1 is installed on the seabed satisfying the installation condition in which the valley height of the wave height when changing from the pulling wave to the spilling wave is the position of the lower end of the suction port 4 at a certain time. The The second wave power generation device 31 is installed on the seabed so that the height of the sea surface when changing from a pulling wave to a near wave at the time becomes, for example, a height below the position above the suction port 34.

  The electric wires 6a and 36a that output the electric power generated by the wave power generation devices 1 and 31 to the outside are connected to, for example, a control unit 40 provided on land. The control unit 40 includes a storage battery 41 connected to the electric wires 6a and 36a of the plurality of wave power generation devices 1 and 31, a constant voltage circuit 42 that converts the electricity stored in the storage battery 41 to a constant voltage and outputs the converted voltage to the outside. It is equipped with. The constant voltage circuit 42 has a built-in power conversion circuit and a charge / discharge control circuit for the storage battery, and the electric power stored in the storage battery 41 when the amount of power stored in the storage battery 41 is equal to or greater than a predetermined value, for example, on time. Is converted to a desired voltage and output.

  By using the power generation system 50 that uses the wave power generation devices 1 and 31, it is possible to reduce the influence of tide fullness and perform more stable power generation.

  In addition, this invention is not restricted to the structure of the said various embodiment, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, the gear transmissions 5a and 5b may connect a plurality of gears using a belt or a chain. In addition, the water wheel 3 is configured to be able to rotate independently at the left and right at the intermediate position, and the gear ratio of the two gear transmissions rotates with a light load to generate power, but with a low output power generation motor and a relatively heavy load. It may be set so as to drive a high-output power generation motor that rotates and generates power.

  The present invention is a wave power generation device that generates power by rotating a water wheel using the wave force of a spilling wave and a pulling wave, and can be used in places where there is a spilling wave and a pulling wave, such as an artificial coast, in addition to the coast. . In the present specification, the terms “coast” and “seabed” include similar places. The wave power generator can also be used on a river bank with a water flow corresponding to a spilling wave, for example, a shallow or a stepped portion. In this case, there is substantially no pulling wave, but the wave power generation device has a wave height valley height when changing from a pulling wave to a spilling wave, for example, the wave height of the river surface in the dry season is equal to or higher than the lower end position of the suction port. By arrange | positioning in the position which becomes, electric power generation can be performed efficiently.

DESCRIPTION OF SYMBOLS 1, 31 Wave power generator 2 Main frame 3 Water wheel 3a Rotating shaft 3b Water receiver 4 Suction port 5a, 5b Gear transmission 6 Power generation unit 6b, 6c Power generation motor 7 Guide plate 8 Pull wave port 40 Control unit 50 Power generation system

Claims (6)

In the wave power generator that is installed on the seabed of the shore and generates power using the force of the surf that strikes the shore and the wave that rushes to the offshore,
A rotating wheel having a rotation axis in a direction intersecting the traveling direction of the swaying wave, a swaying wave passing through the upper side of the rotating shaft, and a water wheel rotating by receiving a pulling wave passing through the lower side of the rotating shaft;
A power generation motor connected to the rotating shaft of the water turbine so as to generate power by rotating in conjunction with the rotation of the water wheel;
A suction port that collects a rush wave in a predetermined height range from the lower side of the rotating shaft of the water wheel to the upper side of the upper end of the water wheel and guides it between the upper side of the rotating shaft of the water wheel and the upper end of the water wheel;
A pulling-wave mouth that is provided below the suction port and passes a pulling wave that passes below the rotation axis of the water wheel;
A frame for holding the rotating shaft, the power generation motor and the suction port, and installing the wave power generation device on the seabed,
The water wheel has a plurality of water wheels provided radially on the rotation shaft, and each water wheel has a bowl shape extending in the direction of the rotation shaft, the surface is concave when viewed from the traveling direction of the wave, and the back side is convex. And
The wave power generation device according to claim 1, wherein the frame is installed on the seabed under an installation condition in which a valley height of a wave height when changing from a pulling wave to a spilling wave is a lower end position of the suction port.   2. The wave power generation according to claim 1, further comprising a guide plate that covers an outer periphery of the water turbine so that a rushing wave passing immediately above the rotation axis of the water turbine flows along the rotation direction of the water turbine. apparatus.   The wave power generation device according to claim 1 or 2, wherein the water receiver has a shape obtained by cutting a hollow cylinder in half along the axis of the cylinder.   A gear transmission for accelerating the rotation of the rotating shaft is disposed at both ends of the rotating shaft of the water wheel, and two power generation motors are disposed above the gear transmissions on both sides. The wave power generation device according to any one of claims 1 to 3.   The wave power generator according to any one of claims 1 to 4, wherein the suction port has a hollow quadrangular frustum shape. A plurality of the wave power generators according to any one of claims 1 to 5, wherein the grounding condition is set at a plurality of predetermined sea level heights within a range of sea level heights that change due to tides. It is provided by changing the distance from the coast to satisfy
A wave power generation system comprising: a control unit that collectively outputs electric power generated by the plurality of wave power generation devices.