JPS627396B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a small wave power generation device.

In general, the majority of wave power generation devices use a variety of mechanisms to convert the traveling energy of waves or the vertical motion of waves into rotational motion, which rotationally drives a generator. There is.

Conventionally known wave power generation devices include pendulum type, Dolphin type,
There are also various compressed air types that use wave pressure to compress air and drive a turbine to rotate. At the same time, some of these methods
For example, they have been put into practical use by being miniaturized and attached to navigational buoys, and research toward their practical use in large-scale power generation, for example, is being actively conducted at the Marine Science and Technology Center in Japan. is being done.

However, in conventional wave power generation devices, other mechanisms are larger than the attached generator, which makes them difficult to handle, especially for small-scale applications.Furthermore, the smaller the size, the more friction loss. It has the drawback of being large and therefore having poor energy conversion efficiency.

The purpose of the present invention is to improve the disadvantages of the prior art, to smoothly convert the traveling waves of waves or reciprocating motion such as vertical motion into rotational motion, and to reduce the loss in the conversion mechanism. Therefore, it is an object of the present invention to provide a small wave power generation device with good conversion efficiency.

Therefore, in the present invention, a case body equipped with two generators in parallel, a push plate portion that rotationally drives each of the generators by relative reciprocating movement with the case body, and this push plate portion It is equipped with two sets of ball screw mechanisms that convert relative reciprocating motion with the case body into rotational motion for each of the generators, and a screw shaft of each ball screw mechanism and a corresponding one of the generators The drive shaft is connected to the drive shaft through a one-way clutch, of which the one-way clutch connected to the one generator is used as a forward rotation clutch, and the one-way clutch connected to the other generator is used as a forward rotation clutch. The clutch is configured to rotate in the opposite direction, and a means for returning the push plate to its original position is provided between the case body and the push plate portion in correspondence with each of the generators, thereby achieving the above object. This is what I am trying to do.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment. This example is an example where the entire device is used floating on the sea surface.
2 indicates the case body, and 2 indicates the push plate portion. In this embodiment, the case body 1 is formed to be able to move up and down by being energized by incoming waves. Further, in this embodiment, the push plate section 2 includes two reference plates disposed horizontally at the upper and lower sides, respectively, as shown in the figure.
It is formed by guide support shafts 14, 14 that connect the reference plates and guide the vertical movement of the floating body 1. In actual use, a relatively heavy resistor 16 is suspended from the push plate part 2 so that the push plate part 2 does not move up and down as much as possible even when the aforementioned waves arrive. ing.

On the other hand, the case body 1 has two working chambers each having a power generation function, as shown in the figure. and,
Inside the working chamber, a generator 11 and a flywheel 7 are installed as described later.

Further, between the case body 1 and the upper plate portion of the push plate portion 2 in FIG.
A ball screw mechanism is installed in parallel with 4 and 14. This ball screw mechanism is a mechanism for converting linear motion into rotational motion (or vice versa), and in this example, it is a motion conversion mechanism for converting vertical motion of a floating body caused by waves into rotational motion. It is adopted as a mechanism. That is, the nut part 5 of the ball screw mechanism is attached to the upper plate part of the push plate part 2,
It is installed so that the ball screw shaft 4 of the ball screw mechanism can move up and down together with the case body 1 while rotating. In this case, the lower end of the ball screw shaft 4 in FIG. 1 is connected to the center of rotation of the flywheel 7 via a one-way clutch 6. Further, 8 and 8' indicate thrust bearings. These thrust bearings 8, 8' are for smoothly receiving the thrust load of the ball screw shaft 4, and one thrust bearing 8 is installed on the top plate 1a of the case body 1 to allow rotation of the ball screw shaft 4. At the same time, the vertical movement of the ball screw shaft 4 and the case body 1 is integrated, and the other thrust bearing 8' is installed on the flywheel 7, and the flywheel 7 is connected to the ball screw via the thrust bearing 8'. It has a structure in which the shaft 4 is suspended. Therefore, the rotational motion of the ball screw shaft 4 is efficiently transmitted to the rotational motion of the flywheel 7 by the thrust bearings 8, 8'. This flywheel 7 is further connected to a generator 11 via a joint 9 as shown in the figure.
A rotor shaft 10 is attached thereto, so that the rotor of the generator 11 is rotationally driven.

The aforementioned ball screw shaft 4 is disposed between the top plate 1a of the case body 1 and the upper plate portion of the aforementioned push plate portion 2.
A compression coil spring 3 is provided as a means for returning the push plate to its original position, and the buoyancy of the case body 1 is transmitted to the push plate portion 2 through the compression coil spring 3. ing. 1
Reference numeral 2 denotes a bearing for the rotor shaft 10 that is installed on the bottom plate portion of the case body 1, and a bearing that can sufficiently tolerate thrust loads and radial loads is used. Further, 13 indicates a rubber bellows for waterproofing. Regarding this 13, for example, 1 shown in FIG.
It is also possible to have a cylindrical piston-type structure like 3'. In this way, durability can be improved.

In addition, since the casing 1b of the case body 1 is a closed room, the inside can be completely sealed, so the inside can be made a vacuum, and the fluid resistance of the movement of the flywheel 7 and the generator 11 is significantly reduced. becomes possible. Furthermore, when the case body 1 is pushed up by waves, the top plate 1a of the casing 1b may be expanded to increase the wave receiving area as shown in FIG. 15, 15 is floating body 1
This shows a ball bush for smooth vertical movement.

Next, the operation of the above power generation mechanism will be explained.

As shown in FIG. 1, when the case body 1 is floating on the sea surface, when the sea level rises due to waves, the case body 1 also rises, but the push plate part 2 hardly rises due to the action of the low antibody 16. . Therefore, the relative distance between the case body 1 and the push plate part 2 decreases, and this relative linear movement is caused by the counterclockwise rotation of the ball screw shaft 4 (as viewed from above) due to the action of the nut 5 of the ball screw. converted into rotational motion. One side clutch 6 attached to the end of the left ball screw shaft 4
(positive rotation clutch) is installed so that the one-way clutch 6 engages with the counterclockwise rotation of the shaft, so when the ball screw shaft 4 rotates counterclockwise, the flywheel 7 rotates counterclockwise. Electric power is generated while the rotational energy of is accumulated. On the other hand, the one-way clutch 6 on the right side (reverse rotation clutch) is installed so that the one-way clutch 6 engages with the clockwise rotation of the ball screw shaft 4. While the flywheel is rotating counterclockwise, the rotational energy of the flywheel 7 is released, and during this period, the power generation effect is weakened. Therefore, uninterrupted power transmission can be achieved by efficient power generation on the left and right sides.

Next, considering the time when the sea level falls, the relative distance between the case body 1 and the push plate part 5 increases due to the elastic strain energy stored in the coil spring 3 while the sea level rises, and the ball screw shaft 4 A clockwise rotation occurs. Due to this clockwise rotation, clockwise rotational energy is accumulated in the right flywheel 7 and at the same time strong power generation is performed, but the rotational energy of the left flywheel 7 decreases and the power generation effect weakens. , after which power generation is repeated sequentially.

In this manner, in this embodiment, one of the two is always generating power regardless of whether the sea level is rising or falling, and therefore the power generation mechanism as a whole can obtain a stable power generation output.

Next, a second embodiment will be described based on FIG. 2.

This embodiment adopts a configuration in which the ball screw shaft 4 integrally moves up and down as the case body 1 moves up and down in FIG. 1 in the first embodiment described above, whereas the case body 1, the ball screw shaft 4 only rotates and does not move up and down. Specifically, in FIG. 1, the thrust bearing 8 mounted on the top plate 1a of the case body 1 is fixed to the upper plate portion of the push plate portion 2. As shown in FIG. Further, the flywheel 7 is rotatably mounted on the lower end of the ball screw shaft 4 via the one-way clutch 6, as in the case of FIG. 1 described above. On the other hand, the rotor part of the generator 11 has two drive shafts 10 and 1 on one support shaft side (upper side in FIG. 2).
0 to the flywheel 7, and the other support shaft side (the lower side in FIG. 2) is supported by the bottom plate portion of the case body 1 via a bearing 12, as in the case of FIG. 1 described above. There is. Then, the two drive shafts 1
0 and 10, the flywheel 7 is slidably inserted therethrough as shown in the figure, and thereby the case body 1
In particular, the rotor portion of the generator 11 is guided to the vertical movement of the generator 11 while maintaining its connected state to the flywheel 7, and at the same time, the rotational force from the ball screw shaft 4 is transmitted to the rotor. It is becoming more and more common. In this case, ball bushes 15, 15 are attached to the drive shaft penetrating portion of the case body 1, thereby reducing the friction between the drive shafts 10, 10 and the flywheel 7, and the rotor of the generator 11 is is configured to rotate smoothly via a flywheel 7. The ball bushes 15, 15 are the ball bushes 15 installed in the guide shaft penetrating portion of the case body 1 described above.
Ball bushings 15, 15 are used which function in the same way as the ball bushings 15, 15. The other configurations are the same as in the case shown in FIG. 1 described above, except that the case body 1 is formed somewhat larger in the vertical direction (casing portion) in FIG. 2.

Even in this case, a device having substantially the same effects as the first embodiment described above can be obtained.

Examples of use are shown in FIGS. 3 and 4. In this usage example, each of the above-mentioned embodiments is rotated 90 degrees to fix the case body 1, and the pushing plate part 2 is arranged so that the reciprocating movement is in the horizontal direction. Push plate part 2 receives energy
The purpose is to move the case body 1 back and forth, thereby rotating the rotor of the generator 11. Fig. 3 shows a case in which the case body 1 of the above-mentioned embodiment is fixed to a rock wall, etc., and Fig. 4 shows This shows the case where it is installed in shallow waters. Furthermore, among the above-mentioned embodiments, especially the first
The devices shown in Figures 1 and 2 can be installed on lifeboats, etc., and in the event of a disaster, they can float immediately to the sea surface and perform operations such as sending a rescue signal that can generate electricity. Good.

As described above, according to the present invention, there is provided a case body equipped with two generators in parallel, a push plate that rotationally drives each of the generators by relative reciprocation with the case body, and It is equipped with two sets of ball screw mechanisms that convert relative reciprocating motion between the plate and the case body into rotational motion for each of the generators, and the screw shaft of each ball screw mechanism and the corresponding The drive shafts of the generators are connected through one-way clutches, and the one-way clutch connected to one of the generators is used as a forward rotation clutch, and the one-way clutch connected to the other generator is used as a forward rotation clutch. The one-way clutch is a reverse rotation clutch, and between the case body and the push plate, a means for returning the push plate to its original position is provided corresponding to each of the generators. By fixing one side of the push plate, it is possible to directly convert the relative reciprocating motion between the case body and the push plate caused by the arrival of waves into rotational motion, and it is possible to directly convert the motion conversion between them into rotational motion. Since it uses a ball screw mechanism mainly formed with rolling contact, friction loss can be significantly reduced compared to conventional gear mechanisms, and wave energy is efficiently converted into rotational energy. Therefore, the power generation efficiency can be greatly improved compared to conventional technology, and in particular, since the gear mechanism required in conventional technology is not used, the overall size and weight of the device can be reduced. Since two generators are used, stable output can always be obtained at a constant level with little fluctuation, and as mentioned above, internal loss is small, so it can be used even in low waves. It is possible to provide an unprecedented and excellent small-sized wave power generation device that can easily drive a generator.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view showing the first embodiment of the present invention, FIG. 2 is a partially cutaway sectional view showing the second embodiment, and FIGS. 3 and 4 are respectively for other uses. FIG. 5 is a partial sectional view showing an example of another mechanism that functions in the same manner as the waterproof bellows in FIG. 1. DESCRIPTION OF SYMBOLS 1...Case body, 2...Press plate part, 3...Compression coil spring as means for returning to original position, 4...Ball screw shaft of ball screw mechanism, 6, 6...One-way clutch,
10, 10... Drive shaft of generator, 11, 11... Generator.

Claims (1)

[Claims] 1. A case body equipped with two generators in parallel, a push plate portion that rotationally drives each of the generators through relative reciprocating movement with the case body, and this push plate portion. and two sets of ball screw mechanisms that convert relative reciprocating motion between the case body and the case body into rotational motion for each of the generators, and a screw shaft of each ball screw mechanism and a corresponding one of the generators. Each drive shaft of the machine is connected through a one-way clutch, and the one-way clutch connected to one of the generators is used as a forward rotation clutch,
The one-way clutch connected to the other generator is a reverse rotation clutch, and between the case body and the push plate section, a push plate return means is provided corresponding to each of the generators. A small wave power generation device characterized by: