JP2014145252A - Wave power generation system, transmission body used therefor and rotary conversion section - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wave power generation system with high power generation efficiency in an extremely simple structure having durability even under exposure in rainstorms, a transmission body which makes a rotary motor unlikely to slip, and a rotary conversion section adapted to the transmission body.SOLUTION: Relative vertical motions of a buoy which is floated on the lake or on the sea where the waves are high and vertically moves together with the heaves of the waves, and of an underwater movement inhibitor which can be substantially stationary in the water or on the bottom of water (such as on the sea bottom) in accordance with water resistance (underwater suspension type) or dead weight (water bottom installation type) are converted into vertical motions of an elongated rope-like transmission body by utilizing a weight 7 and the transmission body, thereby operating a rotary motor fixed to the buoy. The transmission body comprises a guide for preventing the rotary conversion section of the motor and the transmission body from being detached even by raging waves and in both the rotary conversion section and the transmission body, cyclic unevenness is formed for reducing slippage thereof.

Description

  The present invention relates to a wave power generation system, and when a generator fixed to a buoy floated on seawater or lake water moves up and down with waves, it is difficult to move up and down due to water resistance and suspended in water underwater ( Underwater suspension type), or the generator moves up and down relative to the underwater movement restraint body (water bottom installation type) that has been submerged in the bottom of the water (such as the seabed) due to its large weight. The weight suspended in water moves up and down via a transmission body such as a rope suspended in water by the weight of the body (hereinafter referred to as a weight), and the generator is operated through the transmission body that moves up and down. The present invention relates to a wave power generation system and a transmission body and a rotation conversion unit used therefor.

  Conventionally, some renewable energy sources generate electricity using sunlight or wind power, but sunlight can only be used during sunshine, and it is difficult to use in cloudy or rainy weather. There is basically a low-density air flow that needs to be increased in size. On the other hand, when using wave power, for example, in the ocean, there is always a wave of seawater with a high momentum having a wave height of 1-2 meters, and it is smaller to use such wave power. Highly efficient power generation is likely to be achieved. For this reason, many wave power generation systems for converting wave kinetic energy of the ocean or the like into electric energy have been proposed. For example, there is a power generation system that converts wave energy into air energy and then drives a generator via an air turbine, which has an air chamber in which a horizontal water channel of an incident wave is bent vertically, There has been a turbine power generation system that is provided with a communicating air tank and a duct that communicates the air tank with the atmosphere, and is rotationally driven by an air flow inside the duct (see Patent Document 1). However, since the large energy of water waves is only used for compressing air of the same volume and small momentum, it is necessary to increase the size and the energy conversion efficiency is low.

In addition, the floating body moves up and down due to the wave of seawater, and the piston connected to the floating body moves up and down in the cylinder. However, when the piston moves upward and downward due to the action of the upper and lower valves of the cylinder, the cylinder The seawater inside is sent to the air chamber. The flow of seawater sent from the cylinder to the air chamber has unevenness, but the air in the air chamber acts as a cushion, and when it is sent from the air chamber to the turbine generator, the unevenness is sufficiently removed and stable power generation is achieved. There has been a seawater turbine power generation system (see Patent Document 2). This method uses a flow of seawater with a large momentum, so it is a power generation system with high conversion efficiency, but it is necessary to fix the cylinder that supports the vertical movement of the piston, and for this reason it is fixed to the seabed or quay. However, there was a problem with durability.

Further, conventionally, a floating body that can be moored on water and a generator disposed on the floating body are provided. The floating body is formed in a long cylindrical shape, and the ballast attached to the lower end of the floating body and the ballast The floating body is vertically suspended by adjusting the buoyancy of the buoyancy adjustment chamber provided in the middle of the floating body at a position away from This reduces the resistance of water to the vertical movement of the floating body, while providing a protrusion on the lower part of the floating body that increases the resistance of water, and uses the air flow generated between the inside and outside of the air chamber due to the vertical movement of the water surface. There has been a wave power generation system in which an air turbine and a generator that is rotationally driven by the air turbine are provided at the upper end of a floating body (see Patent Document 3). This method does not necessarily need to be fixed to the sea floor or quay, but by adjusting the buoyancy of the buoyancy adjustment chamber provided in the middle of the floating body, it floats in the sea and makes the floating body difficult to move with respect to the vertical movement of waves It can be evaluated that the floating body is provided on the floating body. However, the efficiency of seawater waves with a large momentum is still converted into an air flow with a small momentum and power is generated by an air turbine, resulting in a decrease in conversion efficiency. Furthermore, since the floating body is formed in a long cylindrical shape, there has been a problem that severe rolling occurs due to a transverse wave caused by a severe storm such as a typhoon, and the generator durability is particularly poor.

Conventionally, using a sealed buoy and a vibrator coupled to the inner wall of the buoy by a spring, the vibrator is fixed to the vibrator by utilizing the relative motion of the vibrator with respect to the buoy that floats in the ocean and vibrates up and down. There has been a wave power generation system in which a generator is rotationally driven by a pinion engaged with a rack (see Patent Document 4). In this method, the generator is housed in a sealed buoy, and it is a structure that is protected from seawater and is highly durable. However, it is necessary to adjust the resonance frequency between the spring and the vibrator. Because the resonance frequency fluctuates even for the power generation load, it is difficult to obtain stable vibration, the buoy tilts against the rolling due to the wave, fluctuation of the resonance frequency of the power generation system and reduction in power generation efficiency There were problems such as.

Conventionally, a generator that generates electric power using a floating part that moves up and down according to the undulations on the sea surface and a reversal motion that occurs in a rotating shaft part fitted in the bearing of the floating part, and is installed on the seabed. There has been a wave power generation system having a mooring portion that is connected to a anchor using a wire rope or the like and moored (see Patent Document 5). However, this required a mooring section installed on the sea floor, and there were problems with this construction and installation location. Conventionally, the vertical vibration of the wave is changed to the vertical vibration of the float (or ship), and the vertical vibration of the float is generated by the hydraulic device using the lever principle and the turbine generator is operated by this compressed air. There was a system (see, for example, Patent Document 6). However, since the insulator arm is stiff and long, the distance from the place where the turbine generator is fixed increases, and there is a problem of durability such as being easily destroyed by a storm such as a typhoon.

Conventionally, as a wave energy converter (see Patent Document 7), a linear generator is provided in a floating member as a buoy, and a vertically oriented column having a submerged member provided below an average water line. There is a wave power generation system in which the long and narrow supporting structure vibrates up and down relatively with the wave with respect to the floating member to operate the linear generator and extract electric power to the outside. In this case, since it is better that the submerged member does not move with the wave, a rotary generator is mounted in the submerged member and is suspended from the submerged member from the ballast means 52 via the pulley mechanism 54. The rotary generator uses a tension mooring system consisting of cables extending to the balancing means so adapted that the rotary generator operates and generates electricity when it fluctuates up and down, and the current flows through the electrical load. There has been a proposal to make the submerged member difficult to move with the wave using the electromagnetic brake of this. It is also proposed that the electrical load may be a battery or the like. However, in this proposal, the action of the rotary generator is to make the submerged member difficult to move, and the generator that extracts the electric power to the outside is a linear generator attached to the floating member. It is mainly a floating member that does. Therefore, since the submerged member is in the water, it is difficult to move due to the resistance of water, but further, the electromagnetic brake of the rotary generator is used to make it difficult to move. The amount of power generated by the machine is small in the first place. Further, since the rotary generator is housed in a submerged member, it is submerged in seawater and has problems such as durability and electric leakage.

Conventionally, as a wave energy converter (see Patent Document 8), one end of a short link chain is engaged with a tetrapot installed on the seabed, and a weight is attached to the other end. In the power generation system engaged with the sprocket provided on the float, the float moves up and down at the same time as the sea level rises and falls, and the rotation of the sprocket turns the generator. There was a power generation system at the time of wave power of the rotating system only. However, the reversible unit is complicated and reduces efficiency, causing failure, and organisms such as shellfish in the sea, algae, seaweeds and suspended matter are attached to the short link chain that extends into the sea, and the sprocket In the case of a rough wave such as a typhoon or the like, there is a problem that the weight moves abnormally greatly and comes off from the sprocket due to a large shake of the float short link chain during a typhoon or other rough wave.

JP 2012-2218 Japanese Unexamined Patent Publication No. 2011-21590 JP 2006-97633 A JP 2007-297929 A JP 2006-226274 A JP 2005-188493 A Special table 2009-542964 Japanese Patent Laid-Open No. 11-6472

  The wave power generation system installed on the sea is required to have a structure that is not easily destroyed even if it is exposed to storms such as typhoons and is also exposed to the powerful wave energy of seawater. In that sense, a wave power generation system moored or fixed near a quay or embankment has a problem of durability due to the danger of colliding with the quay or embankment. Further, if the generator is not a structure that protects from seawater, there are problems such as lack of durability and electric leakage, and a durable and highly efficient power generation system is required to overcome these problems. In addition, when it is installed in the ocean and becomes large, the issue of fishery rights and the problem of landscape must be considered.

Wave energy is divided into vertical vibration energy and horizontal vibration energy in the vicinity of the water surface where the wave swells. The combination of these vertical vibrations and horizontal vibrations causes water molecules to rotate. I know. Also, the radius of rotational motion creates wave undulations near the water surface, but as the depth from the water surface increases, the rotation radius decreases rapidly, and most of the water is at a depth of about half a wavelength of wave undulations. However, it does not move up and down, leaving a horizontal vibration component, but it is also known to decrease rapidly with depth.

The present invention solves the above-mentioned problems and utilizes the fact that the radius of rotation of the water rapidly decreases as it becomes deeper from the water surface. Install a movement suppression body or install an underwater movement suppression body on the seabed (water bottom installation type), and make waves that swell and vibrate (mainly up and down) relative to this underwater movement suppression body Relative motion with a floating buoy, which is generated by a rotary generator fixed to the buoy via a weight suspended in water and a rope-shaped transmission body. Output from the generator is durable with few failures, making it difficult for deposits to adhere to the up and down transmission body of the part immersed in the sea, and having a weight suspended in water even in stormy waves such as typhoons rope Mediator of, abnormally large shake and prevent removal from the rotor of the generator, which aims to very simple structure of a small wave power generation system.

  In order to achieve the above object, a wave power generation system according to claim 1 of the present invention includes at least a buoy floating on a wave of water and a generator 2 fixed to the buoy. A rotation conversion unit 5 that rotates the rotor of the generator to generate electric power; a flexible and slender transmission body 6 that rotates the rotation conversion unit 5; a weight 7 suspended in water through the transmission body 6; An underwater movement restraining body 8 having a structure that resists movement in the water, and the underwater movement restraining body 8 is an underwater suspension type so as to have a weight that sinks in water and lighter than the weight 7. Suspended and made difficult to vibrate up and down due to the resistance of water, and includes guides 80 and 81 of the transmission body 6 that move up and down, and a weight 7 is connected to one end of the transmission body 6. The other end is connected to the underwater movement suppressing body 8, and The underwater movement suppression body 8 and the weight 7 are connected by a flexible wire 60 so as not to have a distance longer than a predetermined length. When the buoy vibrates together with the wave undulation vibration, Since the underwater movement suppressing body 8 hardly moves due to water resistance, the weight 7 relatively vibrates mainly and rotates the rotor of the generator 2 via the transmission body 6. It is characterized by generating electricity.

As a result of the combination of vertical vibrations and horizontal vibrations, water waves, for example, ocean waves, cause sea waves to rotate in the vicinity of the water surface, resulting in wave undulations. Therefore, the buoy floating in the wave has not only the vertical vibration but also the reciprocating horizontal motion along with the wave undulation. The wavelength of seawater is generally several tens of meters, although it depends on the wind speed. In the sea at a depth of about half a wavelength or more, it is an area that is almost unaffected by wave swell, and is affected by such surface waves. An underwater movement suppression body 8 having a structure that resists movement in water in a difficult area is suspended from the generator attached to the buoy through the rope-like body 6 in the sea. Even if the buoy mainly vibrates up and down together with the wave undulation, the underwater movement suppressing body 8 is difficult to move due to the resistance of the water and the weight of the buoy. Among them, the weight 7 connected to the end opposite to the underwater movement suppressing body 8 and suspended in the sea is pulled up via the rope-shaped transmission body 6 or falls when the buoy is lowered. At this time, the reciprocating motion of the transmission body 6 is a mechanism for generating power by reciprocatingly rotating the rotor of the generator 2. More specifically, as described above, the buoy equipped with the generator 2 relative to the underwater movement suppressing body 8 is moved to the top of the wave by swell vibration (not only vertical vibration) along with the wave. For example, the distance between the underwater movement suppressing body 8 and the buoy is increased, the rope-shaped transmission body 6 is pulled toward the underwater movement suppressing body 8 (at this time, the weight 7 is pulled up), and the buoy enters the valley of the wave. This time, the distance between the underwater movement suppressing body 8 and the buoy is reduced, and the transmission body 6 is pulled toward the weight 7 side. Such a reciprocating motion of the transmission body 6 causes the generator 2 to operate. Further, the rope-like transmission body 6 has a guide that restricts the movement of the transmission body 6 so that the weight 7 does not abnormally leave the buoy and detach from the rotor of the generator 2 even in the case of rough waves such as a typhoon. 80, 81.

The reciprocating motion of the rope-like transmission body 6 causes the rotor of the generator 2 to reciprocate. The current generated thereby is alternating current and is determined by the wave swell cycle. The wave swell period is several tens of seconds, and the rotation conversion unit such as a pulley attached to the rotor of the generator 2 generally rotates slowly. The wave height (wave height) is generally about 1 to 2 meters (m), and the reciprocating motion of the rope-like transmission body 6 generally has this amplitude. When the buoy descends in the wave valley, the rotor of the generator 2 is rotated only by the weight of the weight 7, but if the radius of the pulley attached to this rotor is small, it is hung on this pool. Further, the radius of curvature of the transmission body 6 becomes small, and it becomes difficult to obtain smooth rotation. For this purpose, it is necessary to increase the radius of the pulley in consideration of the flexibility of the transmission body 6, and it is recommended to use a pulley having a diameter of about 1 meter. Further, since the pulley shaft is subjected to a large load due to the buoyancy of the buoy and the weight of the weight 7, it is necessary to consider the selection of the shaft diameter and the support at both ends in consideration of these factors. Further, if necessary, an auxiliary pulley may be arranged to reduce an excessive load on the rotor. The weight of the weight 7 should also be designed in consideration of the loss of force due to various frictions involved in the vertical movement of the transmission body 6 and the like. Since the actual rotational speed of the rotor determines the generated power, a rotational speed conversion mechanism with a changed gear ratio can be provided to appropriately increase the rotational speed of the rotor. However, there is a problem that the wave height also changes every moment, and the amount of power generation also changes accordingly, making it difficult to generate AC power that is stable over time. For this purpose, it is recommended to rectify the AC generated power and convert it into direct current, store it in a battery or the like, and take it out.

The wave power generation system of the present invention may float on the lake and use the waves of the lake water. However, since the amplitude of the wave is generally small, it is desirable that the wave power is floated on the ocean and has a large wave height and a large kinetic energy. It is better to generate electricity using the wave of.

In the underwater suspension type in which the underwater movement suppressing body 8 is suspended in the water as described above, the weight 7 is heavier than the underwater movement suppressing body 8. It is expected that the underwater movement suppressing body 8 is pulled up, the position of the underwater movement suppressing body 8 approaches the buoy, and the underwater movement suppressing body 8 is exposed to wave swells. For this purpose, the weight 7 and the underwater movement suppressing body 8 are connected by the wire 60, and even if the weight 7 is lowered to a deep position, the wire 60 connected to the underwater movement suppressing body 8 is not further lowered deeply. ing. That is, by adjusting the length of the wire 60, the distance between the weight 7 and the underwater movement suppressing body 8 is prevented from becoming a distance greater than a predetermined length.

The underwater movement suppressing body 8 is pulled back (sinks) into the water through the flexible wire 60 by the weight 7, so that the weight does not necessarily need to be heavier than the water, but is intended to be pulled upward by the buoy. When it does, the resistance against water is required to resist this, so it is better to make it heavier than water and sink underwater with its own weight. Also, the transmitter 6 cannot be moved up and down unless the weight of the weight 7 in water is sufficiently heavier than the weight of the underwater movement suppressing body 8 in water. In the recommended form, the weight of the underwater movement suppression body 8 in the water is slightly heavier than that of the water, and the weight of the weight 7 in the water is a comprehensive buoy equipped with a generator or the like. The size should be about half the buoyancy when floating on the water. In addition, it is recommended that the shape of the weight 7 be a streamlined shape so that it is difficult to become resistant to water when the weight 7 moves up and down.

When the underwater movement suppression body 8 is about to be pulled up by a buoy floating on the water wave, the lower region of the underwater movement suppression body 8 becomes negative pressure, and from the periphery of the underwater movement suppression body 8 to the negative pressure portion of the lower region. Water enters and this flow creates a vortex, and this vortex (Karman vortex) becomes the resistance of the water to the upward movement of the underwater movement suppressing body 8. In order to increase the generation of this vortex and increase the resistance of water, a peripheral protrusion is formed around the underwater movement suppressing body 8 to further suppress the vertical movement in water. Is also recommended.

The wave power generation system described above is basically a system that floats on water with a buoy, but when it floats on the ocean, there is a risk of being swept away by ocean currents. For this purpose, it is advisable to moor this wave power generation system at a place that does not move due to ocean currents, such as land and seabed. In a mooring system for such a purpose, mooring may be performed using a dredger so as to moor a ship at sea.

A wave power generation system according to claim 2 of the present invention is the wave power generation system, wherein at least a buoy floating on a wave of water, a generator 2 fixed to the buoy, and a rotor of the generator are rotated. Rotation conversion unit 5 for generating electricity, flexible and slender transmission body 6 for rotating rotation conversion unit 5, weight 7 suspended in water via transmission body 6, and resistance to movement in water An underwater movement restraining body 8 having a simple structure, the underwater movement restraining body 8 being a water bottom installation type, and sinking to the bottom of the seabed or the like so as to be heavier than the buoyancy of the buoy and the weight of the weight 7 in water It is made difficult to vibrate up and down by its own weight, and includes guides 80 and 81 of the transmission body 6 that move up and down. A weight 7 is connected to one end of the transmission body 6, and the other end of the transmission body 6 moves underwater. The buoy is connected to the suppressor 8 and wave swell vibrations are connected. Since the underwater movement suppressing body 8 hardly moves when it vibrates up and down, the weight 7 relatively vibrates mainly with the transmission body 6 and rotates the rotor of the generator 2 via the transmission body 6. It is characterized by generating electricity.

It is a case where the underwater movement suppression body 8 is a bottom installation type and is submerged in the bottom of the sea such as the buoyancy of the buoy and the weight of the weight 7 in the water, making it difficult to vibrate up and down by its own weight. As in the case of the above-described underwater suspension type, since the underwater movement suppressing body 8 hardly moves, the operation of the wave power generation system is the same as that described above for the underwater suspension type, and therefore detailed description thereof is omitted here. To do. However, in the case of the underwater suspension type, the underwater movement suppressing body 8 and the weight 7 are configured to be connected by a flexible wire 60 so as not to be a distance longer than a predetermined length. In this water bottom installation type, the underwater movement restraining body 8 is sunk on the sea bottom and hardly falls further, so it is not always necessary to use a flexible wire 60. However, in order to avoid the buoy being swept away by the ocean current or the like and the weight 7 being pulled up beyond the expected depth, the flexible wire 60 having a predetermined length is used to move the underwater movement suppressing body 8 and the weight. 7 is recommended.

The wave power generation system installed in the ocean is most suitable for an underwater suspension type in which the underwater movement suppression body 8 is suspended underwater when the water depth is deep (several tens of meters or more). However, when the water depth is as shallow as several tens of meters or less, the seabed can be used. Therefore, the weight of the underwater movement suppression body 8 itself in water is less than the buoyancy of the buoy and the weight of the weight 7 in water. By creating a water-bottom installation type that is sufficiently heavy, it is possible to create a state in which the underwater movement suppression body 8 does not substantially move, regardless of the size of the waves, simply by submerging the underwater movement suppression body 8 on the seabed. Can do. Of course, even in this case, the weight 7 is lifted or lowered by the buoyancy of the buoy via the elongated rope-like transmission body 6 by the vertical vibration of the wave, and the generator connected thereto is operated. It is.

In the wave power generation system according to the third aspect of the present invention, the guides 80 and 81 have a limiting function that allows the transmission bodies 6 that vibrate up and down only to move within a predetermined range, and at least one guide 80 and 81. This is a case where a foreign matter removing function is provided to remove foreign matter adhering to the transmission body 6.

The elongated transmitter 6 is provided with guides 80 and 81, and the buoy and the weight 7 are abnormally greatly shaken by a rough wave such as a typhoon, and the weight 7 is separated from the buoy and is connected thereto. Restricting the movement of the transmission body 6 so that it can move only within a predetermined range so that it does not come off the pulley or the like directly connected to the rotor of the generator 2, and a long and narrow transmission body extending into the sea 6, organisms such as shellfish in the sea, algae, seaweeds and floating substances adhere to the pulley 6 directly connected to the rotor of the generator 2, prevent the smooth movement of the transmission body 6, or It has a foreign matter removing function that removes foreign matter adhering to the transmission body 6 that does not cause a problem.

The wave power generation system according to claim 4 of the present invention is a case where the generator 2 is housed in the cover 200 so that the generator 2 is not easily exposed to water.

Since the generator 2 generates electricity, there is a risk of electric leakage when exposed to seawater or the like, and durability is remarkably deteriorated due to corrosion or the like. For this purpose, it is necessary to cover at least the generator 2 with a cover or the like and protect it from being exposed to seawater or the like. Here, this is a case where at least the generator 2 is covered and housed in the structure 200. Of course, not only the generator 2 but also a rectifier and a battery may be housed in the cover 200 together. Further, if the cover 200 can be a sealed type, it can be used as the buoy 1 or can be used as an auxiliary buoy.

The wave power generation system according to claim 5 of the present invention is a case where the transmission body 6 is in the form of an elongated rope or belt.

The transmission body 6 from the rotation conversion unit 5 attached to the buoy has one end fixed to the underwater movement suppressing body 8 and the other end suspended from the weight 7 in the sea, along with the movement of the buoy due to the wave swell, The rotation converter 5 attached to the generator 2 by reciprocating motion is reciprocated to contribute to power generation. The transmission body 6 may be a rope such as twisted nylon or carbon fiber, or may be a chain. A strong metallic wire may be used as long as it has corrosion resistance and flexibility. Moreover, in the wave power generation system that has been levitated to the ocean, it is also exposed to typhoons and storms, and the buoy not only performs vertical and horizontal vibrations, but also rotates. Since at least the weight 7 is suspended in the sea, the rope-shaped transmission body 6 reciprocates up and down while being twisted by the rotational motion. In order for the transmission body 6 that reciprocates up and down while twisting to fit in the pulley of the rotation conversion unit 5 in this way, and to rotate the rotation conversion unit 5 smoothly, the cross-sectional shape of the elongated rope-shaped transmission body 6 is It is desirable that the shape is substantially circular with symmetry in the diameter direction (thickness direction).

The transmission body 6 may have a belt shape. In particular, as the timing belt, the unevenness carved in the pulley can increase friction and make it difficult to slip on the contact surface.

The wave power generation system according to claim 6 of the present invention is a case where the rotation conversion unit 5 is a pulley or a gear.

When the rotation converting portion 5 is a pulley, it is necessary to have a friction surface so that the transmission body 6 is difficult to slip, and the side of the pulley is for the transmission body 6 so that the transmission body 6 does not come off. It is better to provide a pulley guide.

When the rotation converter 5 is a gear or a sprocket, it is necessary to use a chain or timing belt having a pitch that matches the pitch of the gear or sprocket. The chain need not necessarily be metal.

The wave power generation system according to claim 7 of the present invention is a case where the rotation speed conversion mechanism 9 is provided that makes the rotation speed of the rotor of the generator 2 different from the rotation speed of the rotation conversion section 5.

In general, the wave swell period of the ocean is several tens of seconds, and the wave amplitude is also about 2 meters. Therefore, the rope-like transmission body 6 of the wave power generation system floating on the sea slowly moves up and down about 2 meters with a large force due to the buoyancy of the buoy and the weight of the weight 7. At this time, although depending on the diameter of the pulley of the rotation converter 5, the number of rotations is not necessarily large. Since the output of the generator 2 increases as the rotational speed of the rotor increases, the rotational speed conversion is such that the rotational speed of the rotor of the generator 2 is larger than the rotational speed of the rotational conversion unit 5 within an allowable range. The mechanism 9 is desirable.

In the rotation speed conversion mechanism 9, the rotation ratio can be adjusted by a combination of the diameters of a plurality of gears, or the rotation ratio may be adjusted using the size of the belt and the large and small pulleys. Even when a gear is used, it is also important to provide a slip mechanism so that it can slip when a large force is applied.

The wave power generation system according to claim 8 of the present invention is a case where the rectifier 40 that converts the alternating current from the generator 2 into a direct current is provided.

In the wave power generation system, it depends on the wave undulation, and the undulation changes every moment, so it is difficult to obtain a stable AC output from the generator 2. In the present invention, the alternating current generated in the generator 2 is converted into direct current through the rectifier 40. The rectifier 40 and the generator 2 are preferably fixed to the buoy and accommodated in the cover 200.

The wave power generation system according to claim 9 of the present invention is a case where a battery 50 for storing a direct current via the rectifier 40 is mounted.

The AC power from the generator may be output to the outside as it is, or the direct current via the rectifier 40 may be output to the outside as it is, but here the battery 50 is also mounted and stored in this. In addition, DC power may be extracted to the outside via the battery 50, or the stored battery 50 can be exchanged with an uncharged battery 50, and the stored battery 50 is carried out to the outside. You may make it take out electric power. The battery 50 should be fixed to the buoy together with the rectifier 40 described above.

The wave power generation system according to claim 10 of the present invention is a case where the cable 25 for taking out the electric power generated by the generator 2 to the outside is provided.

There are various methods for taking out the electric power generated by the generator 2 to the outside. Here, the case where the electric power is taken out through the cable 25 and the AC output from the generator 2 is taken out as it is, In some cases, the direct current output is taken out after being converted to direct current. The cable 25 needs to have a structure in which the exposed portion of the electric wire does not get wet with water such as seawater so as not to cause electric leakage. It is preferable to attach a waterproof connector 30 to the sealed cover 200 and take it out from there. Further, the cable 25 may be a submarine cable passing through the seabed, or may transmit power to the land by floating the water or water surface.

The transmitter 6 according to claim 11 of the present invention is characterized in that the surface shape of the elongated rope-like transmitter 6 is formed with periodic irregularities in the length direction.

In general, when the rotor rotates, an electromagnetic brake as a reaction acts by the current flowing through the load of the generator 2, and the brake is applied so as not to move the rotor. Power generation is achieved when the rotor is rotated against this electromagnetic brake. The transmission body 6 imparts rotational motion to the rotor of the generator 2 via the rotation conversion unit 5 and rotates the rotor that is difficult to rotate due to the electromagnetic brake. Therefore, the transmission body 6 and the rotation conversion unit 5 Slip easily occurs. For this purpose, it is necessary to increase the contact portion between the surface of the transmission body 6 and the rotation converting portion 5 and to increase the friction and prevent slippage. Here, this is a case where irregularities are periodically formed on the surface shape of the transmission body 6 in the length direction. In this case, it is preferable to form periodic irregularities that match the outer periphery of the rotation converter 5.

In the transmission body 6 according to claim 12 of the present invention, the periodic unevenness of the transmission body 6 is symmetrical in the radial direction (diameter direction) of the cross section perpendicular to the length direction of the transmission body 6. This is a case where the cross-section of the unevenness is formed into a substantially circular shape having different diameters along the length direction of the transmission body 6.

Even if the transmission body 6 is twisted and pulled up from the water, the cross-section thereof is substantially circular, so that it fits into the periodic uneven shape of the rotation converting portion 5, and slippage is unlikely to occur and the rotation converting portion 5 is stable. It can be rotated.

The rotation converter according to claim 13 of the present invention is characterized in that periodic irregularities corresponding to the irregularities of the transmission body 6 are formed along the outer periphery of the rotation conversion section 5 so as to fit the transmission body 6. It is what.

As described above, the pulley as the rotation conversion unit 5 and the transmission body 6 need to be difficult to slip. For this reason, the transmission body 6 is also provided with periodic irregularities in the length direction thereof, but the pulleys are also provided with the same periodic irregularities so as to be fitted thereto. Thereby, friction also becomes large and the reciprocating motion of the transmission body 6 can be smoothly changed to the rotational motion of the pulley.

In the wave power generation system of the present invention, when the water depth of the ocean is several tens of meters or more, the buoy is floated on the water, and the generator 2 fixed to the buoy moves up and down mainly with the buoy. Thus, as the underwater suspension type, the weight 7 is lifted or lowered relatively by the rope-shaped transmission body 6 suspended in water against the underwater movement suppressing body 8 that increases the resistance of water and becomes almost stationary. In other words, the rotary generator 2 is driven through the transmission body 6 and there is an advantage that it is not necessary to fix the rotary generator 2 to the seabed or the like.

In the wave power generation system of the present invention, when the water depth in the ocean or the like is several tens of meters or less, the buoy floats on the water, and the generator 2 fixed to the buoy moves mainly up and down with the buoy. Thus, the weight 7 is lifted relatively by the rope-like transmission body 6 suspended in the water against the substantially stationary underwater movement restraining body 8 because the weight is increased and submerged in the bottom as a water bottom installation type. Then, the rotary generator 2 can be driven via the transmission body 6. Accordingly, it is not necessary to fix the underwater movement suppressor 8 with its own weight, and it is not necessary to fix it to the seabed or the like, and the underwater movement suppressor 8 hardly moves. There is.

In the wave power generation system of the present invention, the generator 2 is fixed to the buoy, is essentially positioned on the water, and is further covered with the cover 200, so that it is not exposed to water. Therefore, there is an advantage that there is little fear of electric leakage and high durability.

In the wave power generation system of the present invention, if the cover 200 is a closed system as necessary, there is an advantage that this can also be used as the buoy 1.

The cover 200 (corresponding to the buoy 1) and the buoy 10 floating on the water can be made sufficiently smaller than one wave swell, so they move almost up and down with the wave swell and are exposed to storms such as typhoons. Also has the advantage of not being easily destroyed.

In the wave power generation system of the present invention, the transmission body 6 that suspends the weight 7 and is fixed to the underwater movement suppression body 8 that hardly moves is in the form of an elongated rope or belt. It moves within the range of the guides 80 and 81 (limit function), and even if the buoy is inclined, it is difficult to come off from the pulley of the rotor of the generator 2. Furthermore, since the transmission body 6 is thin and flexible, the influence of waves and the flow of water is small, and it has excellent resilience even when twisted, and the resistance of water is small. But the collision cross section is small. Further, since the transmission body 6 always vibrates up and down, it is difficult for sticking matter such as shellfish to adhere to it, and even if it adheres, it is peeled off when passing through the guides 80 and 81 of the transmission body 6 (foreign matter). Removal function), there is an advantage that it can move up and down smoothly with waves for a long time.

In the wave power generation system of the present invention, since the rotary generator 2 can be used, AC power generation can be easily obtained in place of the rotary motion of the rotor via the elongated rope-like or belt-like transmission body 6. It is done. Therefore, it is not necessary to provide a mechanism that makes the generator rotate in one direction, and the wave power generation system has a simple configuration. Therefore, there is an advantage that durability is improved with few failures.

In the wave power generation system of the present invention, the distance between the weight 7 and the underwater movement suppressing body 8 is selected according to the magnitude of the wave at the installation location, and an appropriate length of the elongated rope-shaped or belt-shaped transmitting body 6 is selected. This has the advantage of being adjustable.

In the wave power generation system of the present invention, unlike a conventional turbine generator using an air flow, a large buoyancy due to water such as seawater having a large specific gravity can be easily obtained through a buoy. In addition, since the waves that are generated day and night are used, there is an advantage that the amount of generated power can be extremely large, and that a normal rotary generator can be used to generate power with a simple configuration.

In the wave power generation system of the present invention, a large buoyancy due to water such as seawater can be easily obtained through a small buoy, so that the rotation speed of the rotor of the generator 2 can be easily increased through the rotation speed conversion mechanism 9. There is an advantage that you can.

In the wave power generation system according to the present invention, periodic irregularities are formed in the lengthwise direction on the surface of the elongated rope-shaped transmission body 6, and further, the irregularities that fit the irregularities of the transmission body 6 also in the rotation converter 5. And the friction between the transmission body 6 and the rotation converting portion 5 of the generator 2 can be increased so that the slip is reduced, so that there is an advantage that a highly efficient power generation system can be achieved. is there.

In the transmission body 6 of the present invention, the cross section of the unevenness is transmitted so that the periodic unevenness applied to the transmission body 6 is symmetrical in the radial direction of the cross section perpendicular to the length direction of the transmission body 6. Since the body 6 has a substantially circular shape with different diameters along the length direction, even if the transmission body 6 is twisted by rotation of a wave such as a buoy, a weight 7 or an underwater movement suppression body 8, the shape is almost the same. does not change. Therefore, even if the transmission body 6 is twisted, there is an advantage that the unevenness of the rotation conversion section 5 can be fitted and the transmission body 6 can be prevented from being detached from the rotation conversion section 5.

It is a schematic block diagram which shows one Example of the underwater suspension type which suspended the underwater movement suppression body 8 in water by one Example of a fundamental structure in order to demonstrate operation | movement of the wave power generation system of this invention. Example 1 It is the schematic block diagram which showed one Example which enabled mooring to the seabed in the underwater suspension type with the wave power generation system of this invention. (Example 2) It is the schematic block diagram which showed one Example of the water bottom installation type which sunk the underwater movement suppression body 8 in the sea bottom with the wave power generation system of this invention. (Example 3) It is a schematic longitudinal cross-sectional view which shows one Example of the transmission body 6 used for the wave power generation system of this invention. Example 4 It is a cross-sectional schematic of the transmission body 6 along the XX line of FIG. Example 4 It is the schematic which shows one Example of the rotation conversion part 5 used for the wave power generation system of this invention. (Example 5) It is the schematic which shows one Example of the underwater suspension type underwater movement suppression body 8 of the wave power generation system of this invention. (Example 6)

  Hereinafter, the wave power generation system of the present invention, the transmission body 6 and the rotation conversion unit 5 used therefor can be easily manufactured by conventional techniques, and will be described in detail with reference to the drawings.

  FIG. 1 is an example of a basic configuration for explaining the operation of the wave power generation system of the present invention, and is a schematic configuration diagram showing an example of an underwater suspension type in which an underwater movement suppressing body 8 is suspended in water. This is an example of floating and operating on the ocean. In this embodiment, a rotary generator 2 fixed by a support base 100 is provided on a buoy 10 including a filler 11 having a density sufficiently lower than that of water. Although not shown in the drawing, the generator 2 has a rotor 21, which rotates to cause the generator 2 to generate AC power. The rotation of the pulley as the rotation conversion unit 5 increases the rotation number of the rotor 21 via the rotation number conversion mechanism 9 directly connected to the rotor 21. The rotor 21 rotates at a rotational speed that is, for example, 10 times the rotational speed of the pulley, so that the generator 2 performs AC power generation. In the present embodiment, the buoy 10 and the generator 2 are also covered with the cover 200, and further, the buoy 10 and the generator 2 are sealed with seawater. ) To float on the sea surface. Therefore, in this embodiment, the buoy is a case where the buoy 1 has a double structure of the buoy 1 of the 200 and the buoy 10 having the filler, for safety. This is because even if the cover 200 is damaged by a storm such as a typhoon and seawater enters the cover 200, the surface of the buoy 10 including the filler 11 having a density sufficiently lower than water is slightly damaged. However, the structure is designed so as not to sink into the sea. A weight 7 is suspended in the sea through a flexible rope-shaped transmission body 6 from a pulley as the rotation converting portion 5, and the other end is against the vertical movement of water due to waves. The underwater movement suppression body 8 spread horizontally so that the resistance of water becomes large is connected. Accordingly, the underwater movement suppressing body 8 is substantially in a state where it remains in the sea. In the sea, if the depth is more than half the wavelength of the wave swell from the waterline, the swell due to the rotational motion of the water wave near the sea surface will decrease rapidly (the radius of the rotational motion will decrease rapidly) It has been found that the influence of wave swells at sea is a region that can be ignored. This is a case where the underwater movement suppression body 8 is held horizontally in such a depth region. Of course, when the buoy is raised, the distance between the buoy and the underwater movement suppressing body 8 is increased, and when the buoy is lowered, the distance between the buoy and the underwater movement suppressing body 8 is decreased. Accordingly, since the principle of the wave power generation is to drive the generator with the transmission body 6 that reciprocates, the underwater movement suppression body is placed in an appropriate water area in a relatively shallow area where wave swell still exists. 8 may be held. Further, the weight 7 and the underwater movement suppressing body 8 are configured to be connected by a wire 60 so that the distance is not too far.

The outline of the operation of the wave power generation system of the present invention will be described with reference to FIG. 1 of the underwater suspension type. The generator 2 is secured to the cover 200 which also serves as the first buoy 1 and the second buoy 10 therein by the swell of the ocean waves. Along with the undulations of the sea surface waves, it moves up and down and moves left and right. Since the underwater movement suppression body 8 in seawater is suppressed due to the resistance of water and does not move with wave undulations, the weight 7 connected to the flexible rope-shaped transmission body 6 moves up and down. Become. At this time, the flexible rope-like transmission body 6 is reciprocated and moves up and down by the height of the wave swell. For example, if the amplitude of the waves is 2 meters (m), the transmission body 6 also moves up and down by about 2 m. Therefore, the generator 2 is operated by the reciprocating rotation of the pulley of the rotation conversion unit 5 linked with the transmission body 6. AC power generation.

In this embodiment, a rectifier 40 that rectifies an alternating current generated by the rotary generator 2 and converts it into a direct current is mounted, and the battery 50 can be charged with the direct current. Both the rectifier 40 and the battery 50 are housed in a sealed system cover 200 that is also a buoy 1 so as to be protected from seawater. This is a case where it is possible to transmit to the land or the like with a water-resistant cable 25 via a connector 30 provided on the upper part of the sealed cover 200 in order to take out the generated electric power to the outside. Here, it is also an example in which DC power charged in the battery 50 via the wiring 24 is transmitted using the cable 25.

Although the cable 25 may or may not be used, a light can be attached to the buoy 1 and used as a sign or a lighthouse. Further, a special connector with improved waterproofness is provided in the cover 200 so that the power can be taken out via the cable 25 without transmitting power, for example, as a base for supplying power energy to a navigating ship. The wave power generation system of the present invention may be floated everywhere in the ocean channel so that it can be used.

Further, in this embodiment, the sealed cover 200 can be divided into the cover body 210 and the cover lid 220, and the upper and lower cover bodies 210 and the cover lid 220 are closed by the cover joint portion 250 to be sealed. I have to. Moreover, since the sea surface is shaken by the waves, the flexible rope-like transmission body 6 suspended in the sea also fluctuates and contact with the sealed cover 200 occurs, so that a hole 90 is opened at the bottom of the cover 200. A guide 80 that reduces the friction of the transmission body 6 is attached to the pulley, and the two transmission bodies 6 that move up and down even in rough waves such as typhoons are abnormally separated from each other and attached to the generator. A restriction is added so that the transmission body 6 does not come off from the transmission (restriction function). Moreover, the guide 81 is attached to the flat-plate underwater movement suppression body 8 suspended underwater so that the buoy and the weight 7 are not abnormally separated by rough waves (restriction function). Furthermore, when adhesion of foreign matter such as shellfish, seagrass or large floating substance in the sea is present in the place where the transmitter 6 is immersed in seawater, this extraneous matter is removed (having a foreign matter removing function). In this case, the guide 80 is provided with a ring-shaped guide protrusion 80a. Of course, depending on the size of the hole 90 of the guide 80, the guide protrusion 80a may not be provided. The above-described guide 81 provided in the hole 91 also has a foreign matter removing function due to the small size of the hole. Further, the partition wall 110 and the support base 100 are configured to prevent seawater from entering the upper room in the closed cover 200 that houses the generator 2 and the like.

In the present embodiment, as described above, there is also a hole 91 at the center of the flat plate-like underwater movement suppressing body 8 suspended in seawater, and connected to the other end of the flexible rope-shaped transmission body 6. The weight 7 is suspended in the sea through the hole, and the transmission body 6 reciprocates up and down with the wave in the guide 81 attached to the hole 91. The transmission body 6 includes guides 80 and 81 for the transmission body 6 so that the transmission body 6 does not come off from the rotation conversion portion 5 of the generator 2 even in rough waves. At this time, since the guides 80 and 81 and the rope-shaped transmission body 6 come into contact with each other due to the magnitude of the wave or fluctuation, the guides 80 and 81 having both the restriction function and the foreign substance removal function are strong and strong so as to reduce friction. Materials and shapes are required.

The weight 7 in the water needs to be heavier than the underwater movement suppression body 8, and when the wave is in the lowest state, the weight 7 suspended from the buoys 1 and 10 is deepest in the sea and located at the lowest position. The underwater movement suppression body 8 is pulled downward by the wire 60 with the weight 7, and the wire 60 is fully extended. At this time, the distance between the weight 7 and the underwater movement suppressing body 8 is not more than the extended state of the wire 60. When the wave height increases due to the undulation, the underwater movement suppressing body 8 is restrained from moving upward due to the resistance of seawater, so that the weight 7 is lifted and the wire 60 is loosened. Therefore, it is necessary to predict the height of the maximum wave height and set the length of the wire 60 to be sufficiently longer than that.

In FIG. 1 of the present embodiment, the underwater movement suppression body 8 has a negative pressure at the bottom of the underwater movement suppression body 8 when the underwater movement suppression body 8 is about to be pulled up by a buoy floating on a wave on the water. An example is shown in which a peripheral protrusion 800 is formed around the underwater movement suppressing body 8 so as to generate a Karman vortex and the resistance of water is increased, thereby further suppressing the vertical movement in water. Yes.

FIG. 2 shows the underwater suspension type wave power generation system of the present invention shown in FIG. 1 of the first embodiment. The wave power generation system floating on the sea is prevented from flowing under the sea current or the like. It is the schematic block diagram which showed the example which enabled mooring to the seabed using the mooring rope 65 and the anchor 70 from the body 8. FIG.

Of course, mooring may be anchored not only to the sea floor but also to structures formed on land such as quays and piers. This mooring is not intended to resist vertical vibrations caused by buoys floating on the waves on the water, but merely to prevent the wave power generation system from being swept away by currents such as ocean currents or winds.

FIG. 3 is a schematic configuration diagram showing an embodiment of a water bottom installation type in which the underwater movement suppressing body 8 is submerged in the sea bottom in the wave power generation system of the present invention. This embodiment has the same operating principle as the wave power generation system of the present invention shown in FIG. 1 of the first embodiment and FIG. 2 of the second embodiment as an underwater suspension type, but the difference is the first embodiment. In FIG. 1 of FIG. 2 and FIG. 2 of the second embodiment, the underwater movement suppression body 8 is spread in a suspended state in water, and it is difficult to move due to the resistance of water to its vertical movement, whereas this embodiment In the example, as the water bottom installation type, the weight of the underwater movement restraint body 8 itself is increased and placed under the sea floor, and the vertical movement caused by the wave of the buoy 1 is also due to its large weight. This type is designed not to move. Of course, similarly to the wave power generation system of the present invention shown in FIG. 1 of the first embodiment and FIG. 2 of the second embodiment, the underwater movement suppressing body 8 does not move with respect to the vertical movement caused by the wave of the buoy 1. The weight 7 is relatively moved up and down via the elongated rope-shaped transmission body 6, and the generator 2 operates through the rotation conversion unit 5 connected to the transmission body 6 to generate power. It is. Since the weight 7 and the underwater movement suppression body 8 are connected to the elongated rope-shaped transmission body 6, the degree of freedom is large and the transmission body 6 is thin, so the influence of floating substances in the sea and the influence of waves can be minimized. Therefore, it has the feature that it is easy to withstand rough waves such as typhoons.

In the wave power generation system of the present invention, in the above-mentioned water bottom installation type in which the underwater movement suppressing body 8 is submerged in the seabed, the seabed is used as a stopper for the vertical movement of the underwater movement suppressing body 8, so The wire 60 that connects the weight 7 and the underwater movement suppressing body 8 shown in FIG. 1 and FIG. 2 of the second embodiment is originally unnecessary, and a mooring rod is also unnecessary. However, as described above, it is recommended that the wires 60 be used so that they are not separated from each other beyond a predetermined distance in consideration of the ocean current and the like. This submarine installation type wave power generation system is suitable for installation in a relatively shallow ocean having a water depth of several tens of meters or less.

4 is a schematic longitudinal sectional view showing an embodiment of the transmission body 6 used in the wave power generation system of the present invention, and FIG. 5 is a schematic transverse sectional view taken along line XX in FIG. . As shown in FIG. 5, the transmission body 6 has a flexible elongated rope shape, and has periodic irregularities 600 formed in the length direction thereof so that the diameter direction (radial direction) is symmetrical. In this case, the cross-sectional shape is substantially circular. In this way, even if the elongated rope-shaped transmission body 6 is twisted, the shape does not substantially change. Therefore, the periodic unevenness 600 formed on the outer periphery of the rotation conversion unit 5 so as to fit this shape is formed. However, the rotation conversion unit 5 can be driven to rotate in a state where there is almost no slip despite the twist of the transmission body 6.

FIG. 6 is a schematic view showing an embodiment of the rotation conversion unit 5 used in the wave power generation system of the present invention. The rotation converter 5 is periodically formed with irregularities in the length direction described in the embodiment 4 to fit the transmission body 6. Thus, a schematic side sectional perspective view (upper view) showing one embodiment of the rotation converter 5 having periodic irregularities 600 formed on the outer periphery thereof, and the outer periphery from above with the shaft 550 up and down. It is the schematic (lower figure) of the rotation conversion part 5 at the time of seeing.

The rotation conversion unit 5 is a pulley in which periodic irregularities 600 are formed so as to correspond to the irregularities of the transmission body 6 along the pulley outer periphery 520 along the pulley outer periphery 520 and is also called a sprocket. By using such a sprocket, even when a large force is applied, the elongated rope-shaped transmission body 6 is difficult to slip, and an efficient power generation system can be obtained.

FIG. 7 is not a guide having the shape as shown in FIG. 1 of the first embodiment, for example, attached to the underwater movement suppressing body 8 in the wave power generation system of the present invention. FIG. 6 is a schematic view showing an embodiment of the underwater movement suppressing body 8 provided with two pulleys 85 as guides of the transmission body 6 that can freely rotate so as to sandwich the elongated rope-shaped transmission body 6 between the pulley 85 and the pulley 85; This is a case where the restriction function 81 is provided. Although not shown here, it is possible to provide a foreign matter removing function by providing a metal fitting that protrudes from the yoke 700 or the like.

An elongated rope-like transmission body 6 that moves up and down on the weight 7 side moves in two pulleys 85 as guides 81, so that the two pulleys 85 can freely rotate. It is better that there are no irregularities along the outer periphery of the pulley 85 so that there is little. The two pulleys 85 are fixed to a sturdy yoke 700 attached to the underwater movement suppressing body 8.

The wave power generation system of the present invention described above and the transmission body and rotation conversion unit used therefor are not limited to this embodiment, and various modifications can be made while the gist, operation and effect of the present invention are the same. Needless to say, this is possible.

  The wave power generation system of the present invention is an underwater movement suppression body that can be almost stationary in the sea (underwater suspension type) or in the seabed (water bottom installation type), and a buoy that floats on the lake or the sea where waves are high and moves up and down with wave undulations. The rotary generator 2 fixed to the buoy is operated by using the weight 7 and the elongated rope-like transmission body 6 to generate electric power by moving the relative vertical movement with respect to the vertical movement 8. It is a power generation system that does not need to be anchored to the seabed or quay, except for mooring that prevents it from being washed away by ocean currents, etc., and it has less kinetic energy than power generation using an air turbine. Because it uses wave power, which is a large wave of water, it is a small power generation system that can be operated day and night. Since the buoy floating on the water such as the sea is a compact power generation system, it is difficult to be destroyed even when exposed to storms such as typhoons, and a highly efficient power generation system with high durability can be provided. Since slow wave undulation is used, it is difficult to obtain a steady and stable AC power generation output, but it is recommended to rectify and convert to DC and store it in a battery or the like. Moreover, it can be used by transmitting power through a cable or the like, but it can also be used for a sign light or a lighthouse floating on the sea.

DESCRIPTION OF SYMBOLS 1, 10 Buoy 2 Generator 5 Rotation conversion part 6 Transmission body 7 Weight 8 Underwater movement suppression body 9 Rotation speed conversion mechanism 11 Filler 16 Support wire 21 Rotor 24 Wiring 25 Cable 30 Connector 40 Rectifier 50 Battery 60 Wire 65 Mooring rope 70錨 80, 81 Guide 80a Guide protrusion 85 Pulley 90, 91 Hole 100 Support base 110 Bulkhead 200 Cover 210 Cover body 220 Cover lid 250 Cover joint 300 Clasp 510 Pulley guide 520 Pulley outer periphery 550 Shaft 600 Periodic unevenness 700 Yoke 800 Peripheral protrusion

Claims (14)

In the wave power generation system, at least a buoy floating on a wave of water, a generator (2) fixed to the buoy, a rotation converter (5) for rotating the rotor of the generator to generate electric power, and the rotation A flexible and slender transmission body (6) for rotating the converter (5), a weight (7) suspended in water via the transmission body (6), and resistance to movement in water, almost vertical vibration An underwater movement suppression body (8) that is not stationary, and is connected to a weight (7) at one end of the transmission body (6) and to the other end of the transmission body (6). When the movement restraining body (8) is connected and the buoy vibrates up and down together with the wave swell vibration, the underwater movement restraining body (8) hardly moves, so the weight (7) relatively moves with the transmission body (6). Mainly vibrates up and down to rotate the rotor of the generator (2) via the transmission body (6) to generate electricity. Wave power generation system being characterized in that the so that. The wave power generation system according to claim 1, wherein the generator (2) is housed in a cover (200) so as not to be exposed to water. The wave power generation system according to any one of claims 1 and 2, wherein the transmission body (6) has an elongated rope shape or belt shape. The wave power generation system according to any one of claims 1 to 3, wherein the rotation converter (5) is a pulley or a gear. The wave force according to any one of claims 1 to 4, further comprising a rotation speed conversion mechanism (9) that makes the rotation speed of the rotor of the generator (2) different from the rotation speed of the rotation converter (5). Power generation system. The underwater movement suppression body (8) is an underwater suspension type, and sinks in water but is suspended in water so as to be lighter than the weight (7), and is difficult to vibrate up and down due to water resistance. The wave power generation system described in 1. The wave power generation system according to claim 6, wherein the underwater movement suppressing body (8) and the weight (7) are connected by a flexible wire (60) so as not to be a distance longer than a predetermined length. The underwater movement restraint body (8) is a water bottom installation type, so that it is heavier than the buoyancy of the buoy and the weight of the weight (7) in the water, submerged in the bottom of the sea, etc., and made it difficult to vibrate up and down by its own weight. The wave power generation system according to any one of claims 1 to 5. The wave power generation system according to any one of claims 1 to 8, further comprising a rectifier (40) that converts an alternating current from the generator (2) into a direct current. The wave power generation system according to claim 9, wherein a battery (50) for storing a direct current through the rectifier (40) is mounted. The wave power generation system according to any one of claims 1 to 10, further comprising a cable (25) for taking out the electric power generated by the generator (2) to the outside. The transmitter used in the wave power generation system according to claim 3, wherein the surface shape of the elongated transmitter (6) is formed with periodic irregularities in the length direction. The irregular cross section has a diameter along the length direction of the transmitter (6) so that the periodic irregularities are symmetrical in the radial direction of the cross section perpendicular to the length direction of the transmitter (6). The transmission body according to claim 12, wherein the transmission body has a different substantially circular shape. Periodic irregularities corresponding to the irregularities of the transmission body (6) are formed along the outer periphery of the rotation converter (5) so as to be adapted to the transmission body (6) according to claim 12 or 13. The rotation conversion part used for the wave power generation system of Claim 4 characterized by the above-mentioned.

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