SYSTEM AND METHOD FOR CONVERTING ENERGY FROM THE MOTION
OF SEA WAVES
FIELD OF THE INVENTION
This invention relates to a system for converting energy from the motion of sea waves into transmissible power, preferably electrical power. Also the present invention describes a method and means for extracting energy in the form of thrust from waves from the kinetic energy of moving water in waves. Moreover the present disclosure deals with a special kind of rotor blade exclusively designed for the said system for improving / enhancing the performance of the system.
This wave motion generates a water flow along the surface of the system, and the water flow is converted into a transmissible power, e. g. by driving a rotation of the flow generating body or by driving one or more rotors arranged in the generated water flow.
BACKGROUND OF THE INVENTION
Currently used electrical energy production technologies still make massive use of coal and fuel .fossils, which are used for generating steam. The generated steam imparts rotation movement to a turbine, the shaft of which is mechanically coupled to a rotor of an electrical generator, which, upon rotation of its rotor, outputs electrical energy the magnitude of which is a function, among other things, of the rotation speed of the rotor and the size of the generator. However, coal and fuel fossils have to be transferred from the coalmines and oil wells, respectively, to the location of the power stations consuming the coal/fuel fossils. Usually, power stations are very remote from the coalmines and oil wells, and, therefore, the coal/fuel fossils have to be transferred to them, usually a long distance. Trucks and ships usually transport coal and Fuel fossils. Oil is also

transferred through pipes. Such transportation is expensive and gives rise to the Final cost of the electrical energy that is produced that way. In addition, using coal and fuel fossils greatly pollute the environment. The high costs involved in producing electrical power and the pollution caused by its production, encourage the development and use of other alternative options.
Many different devices for extracting energy from waves have been proposed in the past. Generally, such devices have been suggested in order to enable the generation of electrical power from wave motion and in most cases include a floating body or bodies and complex mechanical or hydraulic power take off means to enable the oscillating movement or relative movement of the floating bodies to be converted into useful power.
Many attempts have been made at utilizing the motion of the sea waves to generate transmissible power by driving floats up and down. One specific type of devices uses a float at the water surface to drive a reciprocating, vertical motion ofa submerged body, so that the relative motion between the submerged body and the surrounding sea water can be used to drive a power generating device, such as a rotor coupled to an electrical generator.
SLONIM DAVID MEIR in an US specification US4359868 discloses such device, in which a float drives a reciprocating motion of a bucket wheel or a bucket chain which will rise and fall in the water in accordance with the surface waves, causing the wheel or chain to rotate or circulate in one direction, regardless of the direction of motion. However, the efficiency of the bucket wheel is limited by the drag by the water on the backside of the buckets as they move though the water.
KLEMM WOLF in a German specification DE 35 08 780 discloses another device, in which a float drives a reciprocating motion of a propeller-like turbine that is arranged horizontally in a radial direction with propeller shaft perpendicularly to the normal water line. The propeller blades automatically

adjust the pitch to the change in direction of incident flow on the propeller with the change of direction of movement of the propeller. Thereby, the propeller always has the same direction of rotation, which improves the efficiency of the device as compared to one, where the direction of rotation changes. A drawback of the disclosed device is that the mechanism for changing the pitch of each of the blades is complicated and expensive to manufacture and is sensitive to the severe environment of the sea.
CHEN JIANBO in a Chinese specification CN1064917 discloses a wave-energy electric power generation device - has generator mounted on base, buoy and spring which make rotor of generator continuously rotate under action of wave, and automatic regulating system. This invention discloses a method and its device for the utilization of wave energy. It mainly consists of buoy, spring, connecting rod (or connecting belt), generator, base, fixing rod, and automatic regulating system for base position. The relative, position of the base with the water surface may be regulated by means of the automatic regulating system; the generator, the base and their relative fixed position under the action of wave may be regulated by means of the automatic regulating system; the generator is mounted on the base; the buoy and the spring make the rotor of the generator continuously rotate under the action of wave so that the electric power is generated by the generator. This invention opens up a new way of scientific utilization of this natural energy source of wave, and possesses of very high exploitation and application value in present days of deficiency in energy source.
Although the efficiency of power converting is quite good for the devices with horizontally arranged propeller-like turbines with adjustable blades, the mechanisms for adjusting the blades cannot be realised without being complicated and expensive to manufacture, and the mechanisms will be sensitive to the severe environment of the sea, both with respect to the physical forces in high waves and with respect to the corrosive sea water, that may enter sealed openings around axels for turning the blades. Also, the repeated

adjustments of the blades expose the mechanisms to wear, in particular because the adjustment movements are started and stopped twice for each cycle of the reciprocating motion, each stop requiring to the mechanism to absorb the kinetic energy of the pitching blades. The wear can be fatal to the practical use of the device for producing power from sea waves, as any repairing of maintenance of sea based plants is complicated and expensive to perform, and the operational reliability of the plant is therefore crucial.
Thus, it is an object of the present invention to provide a device for converting sea wave energy into transmissible power, such as electrical power by extracting energy in the form of thrust from waves from the kinetic energy of moving water in sea waves.
This object is reached by the present invention, in which the system is covered by 3 feet thick walls from three sides. The side facing the sea is open at one side and is having horizontally tapered walls, making a passage say for the incoming waves. The waves converge through this passage with increased force and speed. The thrust of the waves in a particular direction pushes a improved designed rotor blade inside the system and the mechanical energy / power thus generated is transmitted outside from the rotor shaft drive and converted into electrical energy using power generators.
Summary of the invention
The present invention is based on the fact that sea waves are of only finite depth, that is, the surface of the ocean may be in violent motion because of wave action, at the same time that the water at a certain depth will be relatively calm. This invention utilizes the kinetic energy of the waves and utilizes it for movement of rotors. More particularly the present invention relates to a system for converting energy from the motion of sea waves into transmissible power, preferably electrical power. Also the present invention describes a method and

means for extracting energy in the form of thrust from waves from the kinetic energy of moving water in waves.
Such as herein described there is provided a system for extracting energy from the kinetic energy of the waves comprising of a wall arrangement for the acceptance of the wave thrust having thick covered walls from three side with open at one side for the acceptance of the waves; a rotor assembly having a plurality of moving blades; wherein the wall arrangement have three different pockets arranged for converting water flow generated along at least one of said surfaces by the reciprocating, preferably substantially a vertical movement thereby transmitting the kinetic energy to the stationary rotor blades and converted into transmissible electrical power.
The present disclosure also deals with a special kind of rotor blade exclusively designed for the said system for improving / enhancing the performance of the system and reducing the wear and tear of the system.
Therefore, it is an object of the invention to provide a system and a method for efficiently and inexpensively converting the energy of sea waves into electrical power.
It is yet another object of the invention to provide an energy converter unit that has a simple structure.
It is a further object of the invention to provide an energy converter unit that sustains high operating efficiency irrespective of the condition of the sea waves.
It is a further object of the invention to provide an energy converter unit that sustains high operating efficiency by minimizing the water resistance by providing openings in the bottom for the release of water.

It is a still further object of the invention to provide an energy converter that exploits the energy of the wave to a nearly complete degree.
It is a still further object of the invention to provide an energy converter unit that utilizes essentially all the energy contained in the sea waves.
It is a still further object of the invention to provide an energy converter unit capable of self-adjustment to the normally varying conditions of the sea waves.
It is yet another object of the invention to design a special kind of blade which can have gates which can be opened or closed whenever required for lesser friction and minimizing back thrust.
It is yet another object of the invention wherein the gates in the rotor blades can be controlled from outside by a cam or automatically with the water pressure outside.
It is yet another object of the present invention wherein a plurality of through gates may be formed in each blade to define a plurality of passages around the rotor surface and a plurality of closures may be provided to extend through these passages respectively
Other objects and advantages of the invention will become apparent as the description proceeds Summary of the Invention In the following description
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Invention are given in the accompanying drawing, of which
Fig.1 shows a rotator system for wave energy generation as per the object of the present invention;

Fig. 2 shows an alignment of the gates on the rotor blade as per the embodiment of the present invention;
Fig.Sa, 3b and 3c are the different positions of the blade at different operating times as per the embodiment of the present invention.
DETAILED DESCRIPTION
Now, preferred embodiments of the present invention will be described with reference to the accompanying drawings.
Referring to Figure 1, a rotator system for wave energy generation consists of a wall arrangement for the acceptance of the wave thrust inside the arrangement and passing it on to a rotor assembly having a plurality of moving blades buried in a rotor surface.
The system is covered by 3 feet thick walls from three sides. The side facing the sea is open at one side and is having horizontally tapered walls, making a passage say 'P' for the incoming waves. The waves converge through this passage P with increased force and speed. The height of the water level inside the system is about 14 feet. The height of all the walls is not be less than 20 feet, so that fresh waves do not enter the system from any other side except through the passage P. Also the system consists three pockets i.e. pocket 'A', pocket 'B' and pocket '3' as shown in the Figure 1.
According to the another aspect of the invention, in water actuated or actuating rotary machine having a plurality of rotor blades, means for damping vibration of said blades comprises of plurality of through gates formed in each blade to define a plurality of passages around the rotor surface and a plurality of closures may be provided to extend through these passages respectively. The gates are

shown in Figure 2. The gates are automatically actuated with the water pressure and the gravitational force for the opening and the closing operation. There is also provided a cam made of cast iron mounted on a support above the Rotor shaft.
The rotor as disclosed have at least 4 blades, each 10 feet long and 6 feet high, provided between Pocket A and Pocket B. The rotor is fixed slightly upward from the ground level so that it is effected only by the sea waves, and unnecessarily does not do water churning.
In the present system, rows of blades project radially outwardly from the circumferences of respective rotor disks that are, in turn, attached along a length of an axially aligned shaft. Each blade extends radially from a rotor disk and is affixed at its root to the disk by a mechanical connection. The top portion of each blade reacts to the forces of a working fluid flowing axially through the system to produce rotation of the rotor, thereby extracting mechanical shaft power from the working fluid. The blades experience steady state centrifugal forces, bending moments and alternating forces during operation. In addition, blade vibration from alternating forces will generate significant stresses on the attachment structure.
When Ocean waves enter the system through the passage P, they push the rotor blades in front of them inside pocket A. At this time all the blades entering pocket A, their gates will remain closed. The closed gates are shown in Fig 3(a). The blades are thus pushed by the waves. At the same time all the gates of the blades inside pocket B will remain open allowing the water to move freely through them. The blade condition along with the defined position of the gates at pocket B is shown in Figure 3(b). The incoming waves will go on pushing and rotating the blades. Due to open gates in pocket B, their will not be much water resistant.

All blades of the rotor will be having gates like Venetian blind, which will close and open when needed. They will remain closed when they are inside pocket A and will open when they are inside pocket B. The arbitrary position of gates in between is shown in figure 3(c). This is done by a cam provided at the top of the rotor shaft. Gates can be closed and opened without Cam but also by water pressure. The walls shown as X and Y have opening at the ground level, below for releasing the water collected from the waves. Thus the fresh waves will not disturb the still water inside pocket B.
The rotor blades used in the system are around 10 feet long and 6 feet high blade is sufficient enough to generate force. The material used for the rotor blades is high tensile stainless steel. The walls are made up of high quality bricks and the walls are made such that they are open at the ground level. The system goes on releasing the collected water through the ground opening in walls X and Y.
The mechanical energy produced from the disclosed system is taken out from the rotor shaft drive by either directly or through air compressor or hydraulic pumps for running electric generators.
Although the foregoing description of the present invention has been shown and described with reference to particular embodiments and applications thereof, it has been presented for purposes of illustration and description and is not intended to be exhaustive or to limit the invention to the particular embodiments and applications disclosed. It will be apparent to those having ordinary skill in the art that a number of changes, modifications, variations, or alterations to the invention as described herein may be made, none of which depart from the spirit or scope of the present invention. The particular embodiments and applications were chosen and described to provide the best illustration of the principles of the invention and its practical application to thereby enable one of ordinary skill in the art to utilize the invention in various embodiments and with various modifications

as are suited to the particular use contemplated. All such changes, modifications, variations, and alterations should therefore be seen as being within the scope of the present invention as determined by the appended claims when interpreted in accordance with the breadth to which they are fairly, legally, and equitably entitled.

I Claim:
1. A system for extracting energy from the kinetic energy of the waves
comprising of :-
a wall arrangement for the acceptance of the wave thrust having thick
covered walls from three side with open at one side for the acceptance of
the waves;
a rotor assembly having a plurality of moving blades;
wherein the wall arrangement have three different pockets arranged for
converting water flow generated along at least one of said surfaces by the
reciprocating, preferably substantially a vertical movement thereby
transmitting the kinetic energy to the stationary rotor blades and converted
into transmissible electrical power.
2. A system for extracting energy as claimed in claim 1, wherein the walls
are at least 3 feet thick made up of high quality bricks and the wall side, facing
the sea is open having horizontally tapered walls, thereby making a passage for
the incoming waves.
3. A system for extracting energy as claimed in claim 1, wherein the height of
the walls are not be less than 20 feet, so that fresh waves do not enter the
system from any other side except through the passage and the height of the
water level inside the system is about 14 feet.
4. A system for extracting energy as claimed in claim 1, wherein the walls
are open at the ground level for the release of the collected water through the
ground openings.
5. A system for extracting energy as claimed in claim 1, wherein the rotor
assembly has at least four blades and are around 10 feet long and 6 feet high.

6. A system for extracting energy as claimed in claim 5, wherein the rows of
rotor blades project radially outwardly from the circumferences of respective rotor
disks that are, in turn, attached along a length of an axially aligned shaft and
each blade extends radially from a rotor disk and is affixed at its root to the disk
by a mechanical connection.
7. A system for extracting energy as claimed in claim 5, wherein each blade
further comprises of a plurality of gates formed on each blade to define a plurality
of passages around the rotor surface and a plurality of closures is provided to
extend through these passages respectively.
8. A system for extracting energy as claimed in claim 7, wherein the gates
are automatically actuated with the water pressure and the gravitational force for
the opening and the closing operation
9. A system for extracting energy as claimed in claim 7, wherein the gates
are also actuated by a cam made of cast iron mounted on a support above the
rotor shaft.
10. A method for the extracting energy from the kinetic energy of the waves
using a system as claimed in any of the preceding claims.