JPH048870A - Wave power generation device - Google Patents

Abstract

PURPOSE:To efficiently perform power generation utilizing the vertical movement of a float due to a wave by providing a member for hauling the float to a water zone, a reel for winding the hauling member, a rotatably energizing member for taking up the hauling member about the reel and a member extended about the energizing member for the drive thereof. CONSTITUTION:A wire reel 34 and a housing box 35 are fixed to a power generation box with a fastener 37, and a rotational axis 40 is supported with the fastener 37 and housing box 36 via a bearing 38. Also, a wire reel 34 is so supported as to be freely rotatable about the rotational axis 40 via a bearing 42, and one end of a wire 14a is fixed to the peripheral surface of the wire reel 34, thereby enabling the winding or rewinding of the wire 14a with the vertical movement of a float. Furthermore, one of the disc sections of the wire reel 34 is used as a drive pulley 46 for extending a V-belt 44, and connected to a generator via the V-belt 44. In addition, a plurality of coil springs 48 as energizing members are arranged in the housing box 36.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wave power generation device that generates electric power by utilizing the motion of a float that moves up and down due to waves.

[Prior art] A device for generating electricity using the relative up-and-down movement of waves and a float such as a buoy installed on the sea was developed in Japanese Patent Application Laid-Open No. 4
7-22099.54-50743.58-12084
．． 58-183872, 60-230567,
It is publicly known from publications such as No. 61-226572 and No. 62-41974.

Here, typical examples of the wave power generation device proposed in the above publication are shown in FIGS. 6 and 7.

In FIG. 6, an air piston chamber 20 whose bottom surface is open to water
0 is installed on the sea, and the turbine 2 is installed in the upper end opening 202.
04, and the rotation of the turbine 204 drives a generator 206. The power generation principle of this device is that a head difference H is generated by the water level inside and outside the air piston chamber 200 or by waves, and the air pressure inside and outside the air piston chamber 200 is different due to this head difference H. It drives the turbine 204.

On the other hand, the wave power generation device shown in FIG.
There are 12. A storage chamber 21-4 containing a generator is fixed to the upper end of the support column 210, and is connected to the slide rod 2.
The buoy 212 is supported via 16 and 216 so as to be vertically movable. A rack 218, 218 that can move up and down integrally with the slide rod 216.216 is provided inside the storage chamber 214, and this rack 218.2
A pinion gear 220, 220 meshing with 18 is provided. When the buoy 212 moves up and down due to waves, this up and down movement causes the slide rods 216, 21
6 to the racks 218, 218, and the movement of the racks rotates the binion gears 220, 220, thereby driving a generator (not shown).

[Problem to be solved by the invention] In the wave power generation device shown in FIG.
Although the power is generated by using fluctuations in the pressure within, in principle, only a pressure difference of 0.1 atmosphere is generated when the head H is 1 m, and the turbine 204 is provided. If the diameter of the part is large, the pressure that drives the turbine 204 to rotate will be reduced, and if the diameter is small, the air piston chamber 2 will be
The air in the air piston chamber 20 cannot be completely removed, and the air inside the air piston chamber 20
Due to the resistance of the water when it enters the air, the inertia of the air piston, etc., there is a problem in that the amount of energy and power generated is small despite the large scale of the device.

Additionally, there is a problem in that it costs a huge amount of money to fix this wave power generation device on the sea for tsunami countermeasures and the like.

In this regard, when using a float such as a buoy as shown in Figure 7, for example, if a float that can remove 1 m3 of seawater is installed, a buoyant force of 1 t will be generated, of which the effective wave It is excellent in that it can generate a considerable amount of energy by utilizing buoyancy.

However, in the wave power generation device shown in Fig. 7,
In order to fix the buoy 212 on the sea, it is necessary to drive the support 210 into the seabed and fix it there, which poses a problem in that the work for this is extensive and the cost is enormous.

Furthermore, the water level on the sea varies depending on low tide and high tide, and considering the wave motion at this time, as shown in Figure 8, the water level on the sea varies by 3 to 5 meters per year. At this time, in order to generate power using waves throughout the year in the wave power generation device shown in FIG. It is practically impossible to configure.

Therefore, the present invention aims to wind up a traction member connected to a float on a reel as described later, provide a biasing member on this reel, and store wave energy in this biasing member. Changes in sea water level cause changes in the energy stored in the biasing member, and there is a problem in that the wave driving force cannot be maintained constant.

Therefore, an object of the present invention is to efficiently generate power using the up and down movement of the float caused by waves even at low tide and high tide, while using a device that takes up a relatively small space. It can eliminate the impact on power generation, and is easy to install in water areas.
An object of the present invention is to provide a wave power generation device that can significantly reduce installation costs.

[Means for Solving the Problems] The present invention provides: a float; a string-shaped or band-shaped traction member whose lower end is disposed at the bottom of a water body with a weight and which pulls the float into the water body; a reel for winding up an upper end side of the traction member; a reel rotationally biased to wind up the traction member;
and an urging member whose one end is tightened when the reel is rotated in the rewinding direction; and when the reel is driven to rewind;
a tightening drive member that tightens the other end of the biasing member by a rotational speed that is a small ratio to the rotational speed of the reel, and the rotation of the reel as the float moves up and down due to waves. It is characterized by generating electricity based on the following.

[Function] According to the present invention, the traction member for installing the float in a water body has its lower end placed at the bottom of the water body by a weight,
The upper end side is wound up on a reel, and the urging means constantly applies rotational biasing force in the winding direction of the traction member, so that the traction member can be stretched with a predetermined tension.

Therefore, when the float supported by the traction member rises due to the wave motion, the reel is rewound by the biasing means without sagging, and when the float descends due to the wave motion, the reel is also rewound without sagging. Since it is wound up on a reel, the vertical movement of the float can be reliably transmitted as the rotational drive of the reel.

When the reel is rewound, the biasing member is wound and closed from one end by the tension of the traction member, and at the same time,
The winding driving member tightens the other end of the biasing member by 20% more, so if the reel is rewound 10 times, the winding will be tightened by the amount of 12 times. .

Therefore, even when the sea level drops, sufficient biasing force from the biasing member can be obtained, and the rotation of the reel due to the vertical movement of the float is transmitted to the generator at a constant rotation speed.
Efficient wave power generation can be realized.

When installing this wave power generation device in a body of water, there is no need to drive a support into the bottom of the body of water, and this can only be achieved by throwing a weight fixed to the lower end of the traction member into the body of water. Therefore, the installation work is much simpler than before, and the installation cost can be reduced significantly.

In addition, since tension is applied to the traction member by the biasing means, the float can be arranged and fixed at a position where the traction member is stretched vertically, and even if the float is toppled over by waves etc. 2 also has the effect that it can be returned to its original state by the winding force of the traction member.

Furthermore, with the structure of claim (2), excessive winding force of the biasing member during unwinding of the reel can be released via the friction clutch. Furthermore, with this configuration, even when a wave with a wave width larger than the designed value comes, it is possible to prevent the float from moving due to excess wave force.

[Example 1] Hereinafter, an example of a wave power generation device to which the present invention is applied will be specifically described with reference to the drawings.

First, the overall configuration of this wave power generation device will be explained with reference to FIG. 4.

In the figure, a float 12 is installed in a body of water 10 such as the sea. Further, a towing member 14 is provided for towing the float 12 downward in the water area 10 and towing and supporting the float 12 so as to be movable up and down by waves. An intermediate float 1 is disposed in the middle of this traction member 14.
In this embodiment, the upper traction member of the intermediate float 18 is a wire 14a, and the lower traction member 1 is provided with a wire 14a.
4 as chains 14b, . . . . The traction member 14 may be of a string or band shape that can be wound around a wire reel 34, which will be described later, and may be of any other type as long as it has a tensile strength capable of withstanding a predetermined tension. It can be composed of members.

An anchor 16 as a weight is connected to the lower end of the chain 14b, and the lower end of the traction member 4 is fixed at one location on the water bottom 10b.

Above the float 12, the wire reel 34
A storage room 2o is provided in which a power generator and the like are mounted, and a light bulb 22 that is lit by wave power generation is provided above the storage room 2o.

Next, the internal structure of the float 12 and the storage chamber 2o will be explained with reference to FIG.

The float 12 has a cylindrical shape with a height h = 20 cm and a diameter d-90 cm, and has a tapered shape in the center with a larger diameter on the lower surface side and a smaller diameter on the upper surface side. A communicating relief portion 12a is formed to allow the intermediate float 18 to be stored. A flange 18a formed on the lower surface side of the intermediate float 18
By coming into contact with the lower end peripheral edge of the relief portion 12a of No. 2, it acts as a stopper when the float 12 moves downward.

The storage chamber 20 installed on the upper end side of the float 12 is
It is formed in a substantially conical shape with a disc-shaped base 20a, and the base 20H has a hole 20b in the center thereof through which the wire 14& is inserted, and a seal for liquid-tightly sealing the hole 20b. A member 20c is provided.

Next, details of the power generation box 32 fixed above the base 20a inside the storage chamber 20 will be explained.

FIG. 1 shows a cross-sectional structure of the wire reel and the biasing member storage box, and FIG. 2 shows an overall view of the inside of the power generation box 32.

In FIG. 1, the wire reel 34 and the biasing member storage box 36 are attached to the power generation box 3 by means of fixing fittings 37.
2, and a wire reel-side fixing fitting 37 and a biasing member storage box 36 support a rotating shaft 40 via a bearing 38. The wire reel 34 for winding up the upper end of the wire 1.4H is attached to the rotating shaft 4.
The wire reel 34 is rotatably supported with respect to the float 12 via a bearing 42, and one end of the wire 14a is fixed to the circumferential surface of the wire reel 34.
The wire 14a can be wound or unwound as the wire 14a moves up and down.

One disk portion of the wire reel 34 is connected to a drive pulley 46 on which the belt 44 is hung, as shown in the figure.
The wire reel 34 is rotated by the drive pulley 46. (2) It is transmitted via the belt 44 to a generator 80, which will be described later.

On the other hand, in the biasing member storage box 36, a first coil spring 48a, a second coil spring 48b, and a third coil spring 48c are fixedly held by a spring holder 50 and are arranged as biasing members. These three coil springs 48a, 48b, 48
Each of the springs c functions as a single connected spring.

That is, the spring holder 50 has a bearing 52
It is composed of holders 50a and 50b divided by H, and holders 50c and 50d divided by a bearing 52a, and one end of the first coil spring 48a is fixed to the holder 50a by a spring end fixing part 54. , A/One ends of second and third coil springs 48b and 48c are fixed to holder 50b, and first and second coil springs 4 are fixed to holder 50c.
The other ends of 8a and 48b are fixed, and the third coil spring 4 is fixed to the holder 50d by a spring other end fixing part 56.
The other end of 8C is fixed. Therefore, the three coil springs 48a, 48b, 48c are connected to the spring end fixing portion 5.
4 and the other end fixing portion 56 of the spring.

The holders 50a and 50c are rotatably provided with respect to the rotating wheel 40 via a plurality of bearings 58, and the holder 50a is connected to the friction plate clutch 60.
(details will be described later), and the rotation of the wire reel 34 is transmitted to the spring end fixing part 54 of the holder 50a, and the coil spring 4
8 can be tightened.

On the other hand, the holder 50a is connected to the rotating shaft 40 via a one-way transmission clutch 62.
The holder 5 is slidable in the axial direction by a key fixing portion 62a that fits into a key groove provided in the rotating shaft 40.
Only the rotation in the 0H spring tightening direction is transmitted to the rotating shaft 40. Further, a friction plate pressing spring 64 is provided between the key fixing part 62a and a locking part 63 fixed to the outer periphery of the rotating shaft 40 at a position apart from the key fixing part 62a. The spring 64 presses the friction plate 60a of the friction plate clutch 60 via the holder 50a.

And, on the holder 50c, 50d side (left side in the figure),
A winding drive member is provided that winds up the coil spring 48 from the opposite side by rotation of the rotating shaft 40, and this winding drive member includes a reversing gear device. That is, a center gear 66 is screwed and fixed to the rotating shaft 40, and two planetary gears 68a are meshed with the center gear 66.

68b is provided, and these planetary gears 68a, 68b are rotatable with respect to gear shafts 69a, 69b. Further, a sun gear (internal gear) 70 is provided so that internal teeth mesh with the planetary gears 68a and 68b.
The holder 50d is fixed to the back side of 0.

FIG. 3 shows the meshing state of the reversing gear device. When the center gear 66 rotates in the A direction, the planetary gears 53a and 68b rotate in the opposite direction B, and the sun gear 70 rotates in the opposite direction B.
The sun gear 70 also rotates in the direction B, and the sun gear 70 rotates in the reverse direction of the center gear 66. In the embodiment, the rotation ratio between the center gear 66 and the sun gear 70 is 1:0.
．． The number of teeth is set so that the number of teeth is 2, and when the center gear 66, that is, the rotating shaft 40 rotates 10 times, the number of teeth becomes 2.
A 70 now rotates twice. Therefore, sun gear 70
The spring other end fixing portion 56 of the spring holder 50d fixed to the spring holder 50d can tighten the coil spring 48 while rotating at a rotation speed that is a small ratio to the rotation speed of the rotating shaft 40. Considering that the coil spring 48 can be tightened at the same number of rotations as the reel 34, it is possible to tighten the coil spring 48 at a rate higher than the number of rotations of the wire reel 34.

In addition, in the embodiment, the calibration is performed so that excess accumulated energy of the coil spring 48 can be released, and for this purpose, the friction plate clutch 60, the friction plate pressing spring 64, and the threaded portion 40a of the rotating shaft 40 are calibrated. An adjusting nut 72 is provided to be screwed into the fitting. That is, adjusting nut 7
2 in the tightening direction, the spring holder 50. Locking part 63
is pushed in the axial direction of the rotating shaft 40 (to the right in the figure), and the friction plate pressing spring 64 can apply a predetermined urging force to the friction plate 60a via the spring holder 50a. Therefore, the adjustment nut 72 and the friction plate 60
The biasing force applied to a can be adjusted, and when the rotational force of the spring holder 50 accumulated in the coil spring 48 becomes greater than the rotation blocking force applied to the friction plate clutch 60 based on this biasing force, the friction increases. The plate 60a will slide, thereby making it possible to keep the maximum energy stored in the coil spring 48 constant.

Further, a spring reverse rotation prevention mechanism 74 is provided at the connection part between the rotating shaft 40 and the fixing metal fitting 37 (on the right side of the figure).
If the rotating shaft 40 is rotated, for example, in the direction A in the figure to tighten the coil spring 48, it is prevented from rotating in the direction B.

FIG. 2 shows the entire inside of the power generation box 32, and as shown in the figure, the V-belt 44, which is placed around the driving pulley 46, is placed around the driven pulley 76, and the V-belt 44 is placed around the driving pulley 46.
(The wire reel 34) is configured to be transmitted to the generator 80 via the one-way transmission clutch 78. In the one-way transmission clutch 78, the wire 14a is wound around the wire reel 34, and the driving pulley 46 (wire reel 3
4) rotates in the B direction, the rotation is controlled by the generator 80.
When the float 12 rotates in the opposite direction A, the rotation is not transmitted, and in the embodiment, when the float 12 descends, the generated driving force is applied to the generator 80.

Next, the effect will be explained.

The first characteristic feature of the device of this embodiment is that in order to set the float 12 in the water body 10, a traction member 14 consisting of a wire 14a and a chain 14b is used. Moreover, the wire 14a on the upper end side of the traction member 14 is wound around the wire reel 34, and the wire 14a is wound around the wire reel 34.
is constantly urged to rotate in the winding direction by a coil spring 48. Therefore, the wave causes float 12
When wire 1 rises, the above tension causes wire 1 to
4a is rewinded reliably without sagging, and when the float 12 is lowered by the waves, the wire 14a is wound up without sagging due to the tension,
The vertical movement of the float 12 can be reliably transmitted as the rotational drive of the wire reel 34.

In this embodiment, as the winding retention of the wire reel 34, in addition to the tension force that can reliably wind and unwind the wire 14a one time, even when the float 12 moves in the horizontal direction due to wave motion, the anchor 16 is always maintained. It also provides tension that allows it to return vertically to just above the surface. As a result, even when this wave power generation device is used as a navigational buoy for a sailing ship, its positional deviation can be kept within a certain range. Further, by applying such tension, even if the float 12 is overturned due to a tsunami or the like, the winding tension of the wire 14a can restore the float to its original state. Furthermore, in this embodiment, the coil spring 48
In addition to the above-mentioned two functions, the winding retention function is applied to apply a tension such that the float 12 is submerged 2/3 of the way in still water, for example.

In other words, when the float 12 is installed on the water surface 10a of the water body 10, a buoyancy force equal to the weight of seawater that can be displaced by the float 12's own weight will act on it, but if the float 12 is placed above the water surface 10a, By submerging the float 12, seawater equivalent to 2/3 of the volume of the float 12 can be removed, thereby ensuring a large amount of effective buoyancy, which will be described later, and as a result, it becomes possible to increase wave power generation energy.

When performing wave power generation using such buoyancy, the greatest effect of supporting the float 12 using the traction member 14 is as follows.

That is, in this embodiment, this wave power generation device is installed in a water body 10.
When installing the towing member 14 on the seabed, it is sufficient to simply throw the towing member 14 with the anchor 16 connected to its lower end toward the seabed.

Because the installation work is simple in this way, there is no need to drive pillars into the seabed as in the past, and when using such a wave power generation device as a navigation buoy, the wave power generation device Since a large number of devices must be installed, if this number is taken into account, the installation cost can be reduced significantly.

The next characteristic feature of the present invention is that it is configured to always perform reliable and stable wave power generation regardless of the difference in water level between low tide and high tide. That is, as shown in Figure 8,
The water level on the sea is 3~3 throughout the year, considering low tide and high tide.
There is a difference of 5m. Therefore, in the embodiment, the traction member 14
In addition to determining the length of the coil spring 48 by considering the ebb and flow and the size of the waves, the coil spring 48 is connected to the wire reel 34.
By tightening the coil at a rotation speed higher than that of the coil spring 48 to increase the biasing force, and by releasing the excess biasing force accumulated in the coil spring 48 by the friction plate clutch 60, the coil spring 48 is always kept constant during power generation. The wire reel 34 can be wound up with the urging force of , and even if there is a difference in water level, reliable and stable power generation is possible. At this time, unlike in the past, a large space such as securing a rack length of 5 m is not required, and the wire 14a can be simply wound onto the wire reel 34. Can be downsized to

Next, we will consider the electric power that can be generated by this wave generator.

(1) Float volume The diameter d of the float 12 is 90 marks, and the height h is 20
When expressed as cm, the float volume A can be obtained from the following formula.

A-π(0,9m/2) xo,2 m-0,12
7m' (2) Float total buoyancy If the seawater standard is 1.1, the float total buoyancy B can be calculated from the following formula.

B-AxL, I -0,135t (3) Distribution to total thickness ■ Balance float car of wave generator 45 kg ■ Spring charge float car 45 kg ■ Effective wave float car 45 kg Here, the spring charge buoyancy of ■ is the above-mentioned This is the buoyancy that is consumed when the wire reel 34 is urged to rotate in the winding direction by the mainspring 40.

Therefore, of the total force B, the self-weight balance buoyancy and the spring charge buoyancy are consumed, and the vertical motion due to the effective wave buoyancy can be extracted as wave power generation energy.

(4) Wave power generation output The power generation output of the wave power generation device described above can be converted using the simplified formula below.

Outgoing car total wave buoyancy B/3 x (wave width C/2J2) x (power generation efficiency D/power conversion factor E) As an example, assuming a wave of 20c111 as the smallest wave width C, the power generation efficiency D-0. 2. When the power conversion count is E-8,6, the output of the device of this embodiment is as follows.

Output - 45kg X (20an/2 J2)
X (0,2/8.8)-7,4W Next, the power generation operation in the above embodiment device will be explained.

For example, when the float 12 rises due to waves, the wire reel 34, which is biased to rotate in the winding direction by a coil spring as shown in FIG. Rotate in direction A (rewind direction) in the figure. The rotation of the wire reel 34 is transmitted to the spring one end fixing part 54 of the holder 50a via the friction plate clutch 60, and the coil spring 48 is wound from the spring one end fixing part 54. At the same time, the rotation of the wire reel 34 is transmitted to the rotating shaft 40 via the one-way transmission clutch 62, causing the rotating shaft 40 to rotate in the A direction. Then, the rotation of the rotating shaft 40 in the A direction is from the center gear 66 to the planetary gear 68a.

68b to the sun gear 70.
rotates in direction B, which is opposite to the rotation of the rotating shaft 40, so the coil spring 48 is tightened from the spring other end fixing portion 56 by the sun gear 70. In this case, in the example, the rotation speed of the center gear: the rotation speed of the sun gear - 1:
0.2, so if the wire reel 34 rotates 10 times, the coil spring will be tightened 12 times, and the biasing force will be multiplied.

Further, when the coil spring 48 is tightened to a predetermined urging force or more, the friction plate clutch 60
When a slides, the excess biasing force is released, and due to the water level difference between low tide and high tide, the coil spring 4
Even if the standard biasing force given by 8 changes, it is possible to always maintain a constant biasing force.

On the other hand, when the float 12 is lowered by waves, a predetermined biasing force energy is accumulated in the coil spring 48, so the wire reel 34 rotates in the B direction (winding direction) and the wire 14 In the embodiment, the generated driving force is applied at this time. That is, as shown in Figure 2,
When the driving pulley 46 integrated with the wire reel 34 rotates in direction B, this rotation is transmitted to the driven pulley 76 via the V-belt 44, and the rotation of the driven pulley 76 is transmitted to the generator 80 via the one-way transmission clutch 78. As a result, the generator 80 realizes efficient wave power generation.

Here, in the second term of the above output conversion formula, the wave width is 2
The reason for dividing by is that in this embodiment, power is not generated based on the rotation of the wire reel 34 in both directions, but is generated based only on the rotation in one direction due to the downward movement of the float 12. . Furthermore, the reason for dividing by J2 in the second term is to obtain the effective value of the waves that occur repeatedly. In the embodiment, the power generation efficiency is assumed to be 20% in the above conversion formula, but this assumes the worst mechanical efficiency, and this power generation efficiency can be improved to around 50%.

As described above, according to this embodiment, although the wave power generation device is miniaturized by using the traction member 14,
Even if the wave width is assumed to be 20 cm, the light bulb 22
It can generate enough electricity to keep the lights on all the time.

In addition, when performing such a wave motion, the traction member 14
Preferably, an intermediate float 18 is provided in the middle. That is, if something attached to the traction member 14, such as kelp or shellfish, increases the weight of the traction member 14, this increase pulls the wire 14a to the other side, and the wire 14a is wound on the wire reel 34 by that amount. As a result, the wire 14a that is in place will be rewound. As a result, the effective wave buoyancy corresponding to the returned amount decreases, resulting in a loss in power generation. Therefore, intermediate float 1
8 is provided in the middle of the traction member 14, and the weight increase due to foreign matter adhering to the chain 14b on the lower end side of the traction member 14 is counteracted by the intermediate float 18, thereby preventing the above-mentioned loss of generated power. It becomes possible. Therefore, it is useful to provide the intermediate float 18, especially when installing this wave power generation device in a deep water location.

Note that the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention.

For example, although an example of the electric power generated in the above embodiment is shown, this electric power can be increased as the volume of the float 12 is increased or as the power generation efficiency C in the above conversion formula is improved. In addition to simply lighting the light bulb 22, this power generating device may be used to consume power for other driving purposes. In addition, in this wave power generation device, for example, when lighting the light bulb 22, it is designed so that enough energy can be obtained to constantly light the light bulb 22 even when the wave width is the minimum, but when the wave width is large, In addition to storing surplus generated energy in, for example, a power storage device and using the stored energy as power consumption for driving other components, there is also a method of storing surplus generated energy in a storage device, etc., and using the stored energy as power consumption for driving other components. It can also be used as energy.

Further, in the present invention, it is necessary to have a biasing means that constantly applies a rotational biasing force in the winding direction to the reel that winds up the traction member, or the biasing means may be a coil spring 48 as in the above embodiment. For example, a spring or the like may be used, and in the embodiment, three coil springs 48 are used.
The wire 14 can be either two or one.
It may be possible to set it arbitrarily, taking into consideration the tension that should be applied to a.

The coil spring 90 of the embodiment is made by filling a hollow pipe with a fluid such as oil at a predetermined pressure to loosen it so as to increase the turn pitch, and then mechanically winding it so as to narrow the turn pitch. A rotational energy storage coil (filed on May 30, 1988) constructed by tightening the coil can be suitably employed.

Further, in the present invention, it is possible to arbitrarily design how to generate electricity based on the flywheel to which one of the reversible rotations of the wire reel 34 due to the vertical movement of the float 12 due to waves is transmitted.

[Effects of the Invention] As explained above, according to the present invention, the following effects can be achieved.

■ The float is pulled into a water body by a traction member whose upper end is wound around a reel which is placed at the bottom of the water body by a weight at the lower end and which is constantly biased in the winding direction by a torque applying means. When the float in the middle of the tensioned traction member moves up and down due to waves, this movement can be reliably transmitted as rotational force to the reel, and one of the rotations of the reel in both directions is converted into a generated driving force. This can be transmitted to a generator as a signal, allowing efficient wave power generation.

■ To install this wave power generation device in a body of water, simply throw a weight or a traction member connected to the lower end into the body of water, and there is no need for any work such as driving pillars in the body of water as in the past.
Installation costs can be significantly reduced.

(2) Since the traction member is stretched under a predetermined tension, even if the float is washed away by waves, it can be returned to the predetermined position by the tension of the traction member. Further, even if the float is overturned due to a tsunami or the like, the tension of the traction member can restore the float to its original state.

■ Even if the water level of a body of water changes significantly due to low tide or high tide,
By winding the towing member onto the reel and returning it one time, the float can be always installed at a position corresponding to the water level of the water area, and even if the standard biasing force applied in advance by the biasing means changes due to changes in the water level. , it is possible to maintain a constant biasing force at all times, and it is possible to perform reliable and stable wave power generation throughout the year without requiring any adjustment.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of the main parts of an embodiment device in which the present invention is applied to a navigation buoy, Fig. 2 is a schematic configuration diagram inside the power generation box of the embodiment device, and Fig. 3 is an embodiment example. An explanatory diagram showing the meshing state of the reversing gear device in the device; FIG. 4 is a schematic explanatory diagram for explaining the overall configuration of the embodiment device; FIG. 5 is a diagram showing the float and the inside of the storage chamber in the device in the above embodiment 6 and 7 are schematic explanatory diagrams for explaining a conventional wave power generation device, respectively. FIG. 8 is an explanatory diagram showing changes in water level. 10. Water area, 12. Float, 14. Traction member, 16. Weight, 18. Intermediate float, 20. Storage room, 34.
Wire reel, 36... Urging member storage box, 37... Fixing bracket, 40... Rotating shaft, 44... V
Belt, 46... Driving pulley, 48... Coil spring, 50... Spring holder 54... Spring one end fixing part, 56... Spring other end fixing part, 60... Friction plate clutch, 62 .78... One-way transmission clutch, 64... Friction plate suppression spring, 66... Center gear, 68... Planetary gear, 70...
...Sun gear, 72...Adjusting nut, 74...Spring reverse rotation prevention mechanism, 76...Driver pulley, 80...Generator. Agent Patent attorney Yuki Fuse (2 others) Figure 2 Figure 3 Figure Figure Figure

Claims (2)

[Claims] (1) A float, a string-like or band-like traction member whose lower end is placed at the bottom of a water body with a weight and which pulls the float into the water body, and a reel which is fixed to the float and winds up the upper end side of the traction member. , rotationally urging the reel to wind up the traction member;
and a biasing member whose one end is tightened when the reel is rotated in the unwinding direction; and when the reel is driven to rewind, the other biasing member is rotated at a rotational speed that is a small ratio to the rotational speed of the reel. A wave power generation device, comprising: a seaming drive member that drives an end side to be seamed, and generates power based on rotation of the reel as the float moves up and down due to waves. (2) In claim (1), a friction clutch is interposed at least in the middle of a rotational force transmission path through which the rotational energy accumulated in the biasing member is transmitted to the reel during rewinding drive of the reel. Wave power generation device.