DESC:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

Title of the invention:
WAVE ENERGY CONVERTER - POINT ABSORBER

Applicant:
GOA SHIPYARD LIMITED
(A Govt. of India Undertaking-Ministry of Defence)
Having address as:
GOA SHIPYARD LIMITED
Vasco-Da-Gama, Goa - 403802, India

The following specification particularly describes the invention and the manner in which it is to be performed.
CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] The present application claims priority to Indian Patent Application No. 201821043737 titled “Wave energy converter - point absorber” filed on November 20th, 2018, the entity of which is hereby incorporated by reference.
TECHNICAL FIELD
[002] The present disclosure, in general, relates to the field of power generation. More particularly, the present subject matter relates to a wave energy converter.
BACKGROUND
[003] Generally, with increase in manufacturing and consumer sector, there is a greater need for development of green energy resources to fulfil the energy demand. Ocean wave contains tremendous energy and are considered as major source of renewable energy. The surface ocean waves possess a high and consistent kinetic energy. The captured energy can then be used for electricity generation, powering plants. The energy produced by the ocean waves are continues as the waves occur all though the day.
SUMMARY
[004] Before the present wave energy converter, is described, it is to be understood that this application is not limited to the particular system, and methodologies described, as there can be multiple possible embodiments, which are not expressly illustrated in the present disclosure. It is also to be understood that the terminology used in the description is for the purpose of describing the particular implementations, versions, or embodiments only, and is not intended to limit the scope of the present application. This summary is provided to introduce aspects related to a wave energy converter. This summary is not intended to identify essential features of the claimed subject matter nor is it intended for use in determining or limiting the scope of the claimed subject matter.
[005] In one embodiment, a wave energy converter is disclosed. The wave energy generator comprises an oscillating body that floats on the water surface. Further, the wave energy converter consists of a stationary body with a mooring arrangement. The mooring arrangement of the stationary body restricts the motion of the stationary body. The stationary body is cylindrical in shape which holds liquid and the cylinder is connected to the oscillating body through a rigid arm. The oscillating body is connected to the stationary body through the power take off system. Further the Power take off system consist of pair of solid structure positioned on the opposite walls at predetermined distance of the power take off system and a fixed turbine is placed between the solid structure. The power take-off system utilizes the energy generated by the motion of the oscillating body to rotate the fixed turbine.
BRIEF DESCRIPTION OF DRAWINGS
[006] The foregoing detailed description of embodiments is better understood when read in conjunction with the appended drawings. For the purpose of illustrating of the present subject matter, an example of construction of the present subject matter is provided as figures; however, the present subject matter is not limited to the specific method and system disclosed in the document and the figures.
[007] The present subject matter is described detail with reference to the accompanying figures. In figures, the left-most digit (s) of a reference number identifies the figure in which the reference number first appears. The same number are used throughout the drawing to refer various features of the present subject matter.
[008] Figure 1 and Figure 2 illustrates a cross sectional view of the wave energy converter, in accordance with an embodiment of the present subject.
[009] Figure 2 illustrates a detailed structural drawing of the Power take of system (007).
DETAILED DESCRIPTION
[0010] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words “ comprising”, “having”, “containing” and “including” and other forms thereof, are intended to be open ended in that an items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. It must also be noted that as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Although a wave energy converter, similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary, wave energy converter are now described.
[0011] Various modification of the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art will readily recognize that the present disclosure of wave energy converter is not intended to be limited to the embodiments described but is to be accorded the widest scope consistent with the principles and features described herein.
[0012] As mentioned above, ocean wave contains tremendous energy and are considered as major source of renewable energy. The surface ocean waves possess a high and consistent kinetic energy. The captured energy can then be used for electricity generation, powering plants. The energy produced by the ocean waves are continues as the waves occur all though the day.
[0013] Different method and techniques are developed to utilize the energy generated by the moving oceanic wave. The existing techniques include an acceleration tube attached to a buoyant body. An intermediate section of the acceleration tube defines a working cylinder, with openings in the acceleration tube above and below the working cylinder allowing unobstructed flow of water between the working cylinder and the body of water in which the acceleration tube is immersed. A working piston reciprocates in the working cylinder. A relief passage at each end of the working cylinder is controlled by the working piston to allow unrestricted flow past the working piston when the piston moves past a predetermined position at the end of the working cylinder. An energy absorbing device is connected to the working piston. A restoring device is provided to apply a return force to the working piston towards the working cylinder, if the working piston moves past the predetermined position. Typically, the efficiency of the blade, as disclosed, cannot be maintained same in both directions of the liquid flow. This leads to uneven blade deformations, reduction in the efficiency due to vortices generated at the rotating blades. Therefore, wave energy converter with increase efficiency of the overall wave converter is of utmost importance.
[0014] Another technique may include A wave energy converter (WEC) that contains a shell suitable for being placed within a body of water. The shell contains an internal oscillator comprising a "reaction mass and a spring mechanism coupled between the reaction mass and the shell. The shell and internal oscillator are constructed such that, when placed in a body of water and in response to waves in the body of water, there is relative motion between the shell and the internal oscillator's mass. A power take-off (PTO) device is coupled between the internal oscillator and the shell to convert their relative motion into electric energy. Typically, utilization of such spring systems as disclosed, leads to fatigue and the efficiency of the spring deteriorates with time.
[0015] The present disclosure is directed to overcome one or more limitations stated above or any other limitation associated with the conventional arts. Disclosed is a wave energy converter that converts energy generated by ocean waves into electrical energy.
[0016] The wave energy converter, as disclose in the present subject matter, may comprise an oscillating part that floats on the surface of the water body. The wave energy converter may further include a stationary part having a mooring arrangement to restrict the movement of the stationary part. The oscillating part and the stationary part are connected through a power take off system. Further the power take of system contains a pair of solid structure 005 positioned on the opposite walls of the power take off system. A fixed turbine is placed between the solid structure 005. The power take of system utilizes the energy generated by the motion of ocean waves to rotate the fixed turbine. The fixed turbine is further connected to horizontal permanent magnet, the permanent magnet converts the rotational energy produced by the fixed turbine to the electrical energy. The structure of the power take off system increases the torque generated on the turbine because of the solid structure. A working piston reciprocates in the working cylinder (stationary part). Working piston holds the liquid with the help of two plates which are connected by vertical rods. The plates of the working piston are designed to prevent any leakages of the liquid. An energy absorbing device i.e. permanent magnetic generator is connected to turbine placed inside the working piston. The crest and trough created by the waves and the self-weight of the floating structure act as active and restoring forces which provide consistent energy.
[0017] Before moving to the figures, the following table 1 lists the reference numbers and the respective elements illustrated in the figures, for the sake of easy readability. It should be noted that the below reference numerals have been utilized in the subsequent description of the present subject matter with reference to the figures.
Reference Number Description
001 Stationary Part
002 Oscillating Part
003 Fixed Turbine
004 Liquid
005 Solid structure
006 Horizontal Permanent Magnet
007 Power Take of System
[0018] Now Referring to Figures 1 and 2, the Figure shows a cross-sectional view of a wave energy oscillator.
[0019] Wave energy converter consists of two major part: 1) Oscillating Body 002 and 2) Stationary Body 001. In the embodiment, Oscillating Body (002) may be exposed to the open sea and the forces of water waves, wind and environmental loads act on this structure. This result in the oscillation (displacement) of oscillating body 002 about a reference line. This Oscillating Body 002 may be connected to a Stationary Body 001 through a Power Take-Off (PTO) System 007. The motion of the Stationary Body 001 may be restricted by providing sufficient mooring arrangement. The mechanical energy generated by the Oscillating Body 002 may be utilized by the Power Take-Off (PTO) System to rotate the Fixed Turbine 003. Further from Figure 1, it may be observed that the Fixed Turbine 003 may be connected to a Horizontal Permanent Magnet 006 which converts the rotational energy to electrical energy.
[0020] Further, the Oscillating body 002 may be made from low density material which helps it to float on water. When an incident wave passed through the Point Absorber, it attains a heave motion. As the Stationary Body (Part 001 of Figure 2) contains a closed cylinder in which 004 liquid 004 may be stored, the motion of the Oscillating Body 002 directs the liquid 004 to flow through the narrow solid structure 005 as can be observed from Figure 1.
[0021] Further refereeing to Figure 2, the power take off system 007 contains a fixed turbine 003 and the fixed turbine placed between the solid structure 005. Since the cross-section may be reduced at View AA’ and View BB’, the velocity of the liquid may be increased which results in a higher Rotation per Minute (RPM) of the turbine, thus providing more efficient energy. To increase the pressure on the piston of the Oscillating Body 002, the oscillating cylinder which may have a heave motion may be connected to the Oscillating Body 002 with a rigid arm.
[0022] As observed from Figure 2, the design of power take-off system contains solid structure 005 to direct the liquid 004 flow and the novel design may be used to displace the liquid 004 about the narrow solid structure (005) and the turbine fixed in-between the solid structure can rotate. This turbine may be connected to a horizontal permanent magnet generator. Since this structure may be installed in an open ocean, there will be a continuous oscillation of the oscillating body 002. This setup will generate continuous liquid displacement which results in constant turbine rotation. The torque generated on the turbine may be greatly increased because of the cross-section which follows the Bernoulli’s Principle.
[0023] Although implementations for wave energy converter have been described in language specific to structural features and/or methods, it may be understood that the appended claims are not necessarily limited to the specific features of wave energy converter as described. Rather, the specific features are disclosed as examples of implementations of wave energy converter.
,CLAIMS:
1. A wave energy converter, wherein the wave energy converter comprising:
an oscillating body (002); wherein the oscillating body (002) is exposed to a surface of a water body;
a stationary body (001), wherein the stationary body (001) is provided with a mooring arrangement to restrict the motion of the stationary body (001) wherein the stationary body comprises a cylinder, and wherein the cylinder is connected to the oscillating body through a rigid arm and wherein the cylinder contains liquid;
a power take off system (007), wherein one end of the power take off (007) is connected to the oscillating body (002) and the second end in connected to the stationary body (001);
a fixed turbine (003), wherein the fixed turbine (003) is placed between a solid structure (005) in the power take of system (007), and wherein the solid structure are placed on the opposite walls of the power take of system 007 and wherein an energy generated by a motion of the oscillating body (002) is utilized by the power take off system (007) to rotate the fixed turbine (003);

2. The wave energy converter as claimed in claim 1, wherein the oscillating body is made of low-density material.

3. The wave energy converter as claimed in claim 1, wherein the oscillating body 002 is set in a continues oscillating motion.

4. The wave energy converter as claimed in claim 1, wherein an oscillation of the oscillating body (002) directs the liquid (004) stored in the closed cylinder to flow through the narrow solid structure (005).

5. The wave energy converter as claimed in claim 1, wherein an oscillating cylinder, wherein oscillating cylinder has a heave motion and wherein the oscillating cylinder is connected to the oscillating body with a rigid arm.

6. The wave energy converter as claimed in claim 1, wherein the length of the rigid arm is adjusted as per the sea environmental condition.
7. The wave energy converter as claimed in claim 1, wherein the fixed turbine (003) is connected to a horizontal permanent magnet (006), and wherein the horizontal permanent magnet (006) converts a rotational energy to an electrical energy.

8. The wave energy converter as claimed in claim 1, wherein the design of the fixed turbine (003) and the configuration of the power takeoff system.