GB2262572A - Sea or lake wave energy convertor. - Google Patents
Sea or lake wave energy convertor. Download PDFInfo
- Publication number
- GB2262572A GB2262572A GB9126753A GB9126753A GB2262572A GB 2262572 A GB2262572 A GB 2262572A GB 9126753 A GB9126753 A GB 9126753A GB 9126753 A GB9126753 A GB 9126753A GB 2262572 A GB2262572 A GB 2262572A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rotor
- supporting structure
- cylinder
- rotation
- waves
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
- F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
- F03B13/16—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
- F03B13/18—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore
- F03B13/1805—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom is hinged to the rem
- F03B13/181—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom is hinged to the rem for limited rotation
- F03B13/182—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom is hinged to the rem for limited rotation with a to-and-fro movement
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
- F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
- F03B13/16—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
- F03B13/18—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore
- F03B13/1805—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom is hinged to the rem
- F03B13/181—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom is hinged to the rem for limited rotation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
- F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
- F03B13/16—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
- F03B13/18—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore
- F03B13/1805—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom is hinged to the rem
- F03B13/1825—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom is hinged to the rem for 360° rotation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
A device for extracting energy from sea waves utilises the motion of a rotor comprising a frame (1) and a pair of parallel cylinders (2) held at or below the surface of a liquid perpendicular to the wave direction, the cylinders being caused to rotate so as to produce Magnus effect lift, resulting in a torque around the rotor axis A---A, thus causing the rotor to perform full or part rotations. The rotor is coupled to the shaft of a hydraulic pump (3), with the pump housing held steady by tie members (4) attached to the sea bed. The pump extracts energy from the rotation of the rotor, and may be adapted to pressurise water, or to pressurise a hydraulic circuit to which a hydraulic motor may be connected to turn an electrical generator. In an alternative arrangement (Fig. 3) the hydraulic pump may be interposed between two rotors linked by a compliant member and adapted to partially contrarotate, the pump being actuated by their relative oscillation. End caps (5) (Fig 2) may be applied to the ends of the cylinders to reduce losses due to fluid circulation. <IMAGE>
Description
WAVE ENERGY CONVERTER
This invention relates to a wave energy converter.
Of the numerous patented wave energy converter designs the majority seek to absorb energy from waves upon a sea or lake by using wave action upon a moving member which is coupled to a reaction frame via a power take-off device. The reaction frame is usually adapted to be substantially static, for example by means of mooring or fixing to the sea bed or by being a floating structure large enough for wave forces to cancel over its extent. By contrast, the moving member is adapted to couple effectively to the local wave motion by means of inertial, drag and buoyancy forces.Among the challenges a designer faces are: the provision of an effective moving member; a reaction frame able to resist the instantaneous and fatigue forces of mooring, bending and shear upon it; rectification of the oscillating power absorbed; and the accommodation of the range of wave frequency and amplitude found in nature.
The present invention addresses these challenges by use of lift forces, in particular
Magnus lift forces which offer a high degree of controllability.
The Magnus effect is the interaction of a rotating body with a moving fluid, the body experiencing a lift force perpendicular to the plane defined by the fluid velocity vector and the axis of rotation of the body, the lift force dependent for its magnitude and direction upon the magnitudes and directions of the body rotation vector and the fluid velocity vector.
In waves on the surface of a liquid, if the liquid depth is of the order of or greater than the wavelength, the fluid velocity vector is of nearly constant magnitude but with a direction which rotates at a constant rate at the wave frequency.
For a cylinder rotating beneath waves the lift force is in line with the inertial force and can be many times its size depending on the rotation rate, and of either polarity depending on the rotation direction.
According to the present invention there is provided a device for extracting energy from waves on a liquid, the device being located at or below the surface of the liquid and comprising a supporting structure and at least one rotor mounted for rotation about its axis on the supporting structure, said axis arranged to be substantially perpendicular to the direction of the waves, said rotor comprising a frame provided with a pair of substantially circular cylinders mounted with their axes substantially parallel and coplanar with the rotor axis, and provided with means for being rotated about their respective axes, their rotation rate and direction, and their size and location in the frame being arranged such that when acted on by the waves a substantially balanced torque is produced about the rotor axis.
The invention will now be further described by example with reference to the accompanying drawings in which:
Figure 1 shows a perspective view of a wave energy converter;
Figure 2 shows a perspective view of one modified form of the device of figure 1;
Figure 3 shows a perspective view of a second modified form of the device of figure 1.
Referring to Figure 1, the device shown comprises a frame (1) and a pair of parallel cylinders (2) located close below the liquid surface (W) with the device oriented such that the cylinder axes are perpendicular to the wave direction. The cylinders are caused to rotate in opposite directions thus experiencing opposite lift forces in the moving liquid and producing a torque on the rotor. The relative sizes of the cylinders, their location in the frame and their rotation rates can be arranged to produce a substantially balanced torque about the rotor axis, A---A. Attached to the frame is a hydraulic pump (3) the housing of which is held substantially static by means of tie members (4) attached to the bed of the liquid (not shown), the device being adapted for positive buoyancy to provide tension in the tie members.The aforesaid torque on the rotor will tend to rotate it against the impedance of the hydraulic pump, and providing the impedance is low enough and with the frame in correct orientation, the rotor will tend to phase lock to the rotating wave velocity vector. In this mode the device performs as a synchronous motor and in a steady single-frequency wave the device outputs steady rectified power. The rotor has no end-stop, infinite rotation is allowed thus accommodating the largest waves.
Figure 2 shows a modified form of the device of figure 1 in which the rotor has been modified by the addition of end-caps (5) to the cylinders. These act to reduce the loss of fluid circulation off the ends of the cylinders and hence increase the lift.
The device may also be constrained to operate in an oscillatory mode. Figure 3 shows a second modified form of the device of figure 1 comprising two rotors coupled coaxially by means of a hydraulic pump (3), the pump housing being mounted on the frame of one rotor, the pump drive shaft on the other rotor.
Relative rotation of the rotors thus pressurizes hydraulic fluid. Combined with the hydraulic pump is a compliant member, for example a torsion spring (not shown), adapted to bias the rotors so that in the absence of waves the rotors are disposed as indicated, that is with all cylinder axes coplanar and antisymmetric cylinder rotations. Under wave action the rotors rotate in opposite directions but in an oscillatory fashion, partly because of the restoring force of the compliant member, and partly because one of the rotors is rotating in the opposite sense to the wave velocity vector. The stiffness of the compliant member is chosen to set the resonant frequency of the device to match the principle frequency of the prevailing wave climate. The resonance of the device will be broad because the compliance is partly determined by the the wave itself.The compliant member need only be capable of sustaining a half-turn, at which point the rotors will be symmetric and therefore experiencing torque in the same direction. Under these conditions infinite rotation is allowed thus accommodating the largest waves. The mooring shown in figure 3 attaches to a bearing (6) allowing full rotation of the rotors. Because in this former the device torque reactions are cancelled internally mooring forces are much reduced and the problems of providing a large or rigid or tightly moored supporting structure are removed. The device as shown may experience moments in yaw due to unbalanced wave forces on the antisymmetric structure: these can be avoided by coupling three or more rotors coaxially with a central axis of symmetry.
The cylinders in a rotor require to be rotated. This may be accomplished by mounting a hydraulic motor on the rotor frame coaxial with the cylinder so as to rotate the cylinder relative to the frame. At the rotor pivot provision is made for supplying pressurised hydraulic fluid onto the rotor frame through a sealed rotating joint.
Alternatively, each cylinder may be rotationally coupled by means of a mechanical transmission to the supporting structure, the rotation of the rotor relative to the supporting structure thereby providing rotation of the cylinder. This means of cylinder drive may be implemented for the synchronous device by a gear train or by belt and pulleys, the device then being potentially self-starting: the wave has a phase gradient horizontally and an amplitude gradient vertically, these produce a force gradient across a stationary rotor which will tend to turn it, thus rotating the cylinders, thus producing a lift torque which accelerates the turning of the rotor until it phase-locks to the rotating fluid velocity vector.
It will be understood that a plurality of wave energy devices of any of the types described here may be deployed either separately moored or joined with suitable joints and collectively moored.
Claims (15)
1. A device for extracting energy from waves on a liquid, the device being located at or below the surface of the liquid and comprising a supporting structure and at least one rotor mounted for rotation about its axis on the supporting structure, said axis arranged to be substantially perpendicular to the direction of the waves, said rotor comprising a frame provided with a pair of substantially circular cylinders mounted with their axes substantially parallel and coplanar with the rotor axis, and provided with means for being rotated about their respective axes, their rotation rate and direction, and their size and location in the frame being arranged such that when acted on by the waves a substantially balanced torque is produced about the rotor axis.
2. A device as claimed in claim 1 in which either the supporting structure is moored by tie members to the rigid boundary of the liquid with the device or structure or both being adapted to have positive buoyancy, or the supporting structure is fixed to the rigid boundary of the liquid, or the supporting structure is adapted to float.
3. A device as claimed in claims 1 or 2 in which a work performing means is interposed between the supporting structure and the or each rotor, said means being actuated by the rotation of the or each rotor relative to the supporting structure.
4. A device as claimed in claim 3 in which the impedance of the work performing means is adapted to allow the rotor to which it is coupled to perform full rotations substantially at the same frequency as, and in a substantially constant phase relationship to, the wave acting upon it.
5. A device as claimed in claim 3 in which a compliant member is interposed between the rotor and the supporting structure, said member being adapted to bias the rotor to a rest position on its axis.
6. A device as claimed in claims I or 2 comprising a plurality of rotors arranged with their axes substantially colinear there being interposed between each pair of adjacent rotors one work performing means and one compliant member, the work performing means being actuated by the relative rotation of the adjacent rotors, and the compliant member being adapted to bias the adjacent rotors to a rest position on their mutual axis in which the cylinder axes of both rotors are substantially coplanar and the orientation of the rotors, as defined by the rotation of their cylinders, is antisymmetric.
7. A device as claimed in claims 5 or 6 in which the compliant member is adapted to set the natural frequency of oscillation of the rotor to which it is coupled approximately equal to the frequency of the waves to which the device is exposed.
8. A device as specified in any of the claims 3 to 7 in which the work performing means is a pump arranged to pressurise water.
9. A device as specified in any of the claims 3 to 7 in which the work performing means comprises a mechanical transmission and an electrical generator.
10. A device as specified in any of the claims 3 to 7 in which the work performing means is a hydraulic pump arranged to pressurize a hydraulic circuit.
11. A device as claimed in claim 10 in which a hydraulic motor is connected to the hydraulic circuit and arranged to drive an electrical generator.
12. A device as specified in claims 10 or 11 in which the means for rotating each cylinder in the device comprises a hydraulic motor interposed between the rotor frame and the cylinder, said motor being connected to the hydraulic circuit and arranged to drive the cylinder.
13. A device as specified in any of the claims 1 to 11 in which the means for rotating each cylinder in the device comprises a mechanical transmission interposed between the cylinder and the supporting structure, said mechanical transmission arranged such that rotation of the rotor relative to the supporting structure causes rotation of the cylinder.
14. A device as claimed in any preceding claim in which each cylinder in the device is provided with an annular disc at or towards each of its ends.
15. A device for extracting energy from waves on a liquid substantially as described herein with reference to figures 1 and 3, or 2 and 3 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9126753A GB2262572B (en) | 1991-12-17 | 1991-12-17 | Wave energy converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9126753A GB2262572B (en) | 1991-12-17 | 1991-12-17 | Wave energy converter |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9126753D0 GB9126753D0 (en) | 1992-02-12 |
| GB2262572A true GB2262572A (en) | 1993-06-23 |
| GB2262572B GB2262572B (en) | 1995-01-25 |
Family
ID=10706397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9126753A Expired - Fee Related GB2262572B (en) | 1991-12-17 | 1991-12-17 | Wave energy converter |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2262572B (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2386160A (en) * | 2002-01-04 | 2003-09-10 | Technologies Ltd Ocean | Variable geometry magnus effect turbine |
| GB2425154A (en) * | 2005-04-12 | 2006-10-18 | Green Cat Renewables Ltd | Wave powered turbine |
| WO2009097855A2 (en) * | 2008-02-06 | 2009-08-13 | Oxydice A/S | A device for converting wave energy into mechanical energy |
| WO2009018524A3 (en) * | 2007-08-02 | 2010-04-08 | Douglas Joel S | Magnus force fluid flow energy harvester |
| WO2010111354A1 (en) * | 2009-03-26 | 2010-09-30 | Nguyen Huu Cuong | Wave powered electric generator system |
| WO2010085615A3 (en) * | 2009-01-26 | 2010-11-04 | Egen Llc | Fluid flow energy harvester |
| US7994651B2 (en) * | 2010-09-27 | 2011-08-09 | Dov Frishberg | Apparatus for converting the energy of waves on a body of water |
| CN105508127A (en) * | 2016-01-19 | 2016-04-20 | 曲阜师范大学 | Multi-joint stretchable rod type wave power generation system |
| ES2684449A1 (en) * | 2017-03-29 | 2018-10-02 | Francisco Javier CASTIÑEIRAS CERNEIRA | HYDRAULIC GENERATOR (Machine-translation by Google Translate, not legally binding) |
| CN111878291A (en) * | 2020-07-31 | 2020-11-03 | 魏谦 | Ocean current energy power generation device |
| GB2625082A (en) * | 2022-12-03 | 2024-06-12 | Desmond Lewis Stephen | Reduced cost tidal and/or water flow power generator |
| WO2024123188A1 (en) | 2022-12-07 | 2024-06-13 | World Wide Wind Tech As | Contra-rotating wave turbine (crwt) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1986004646A1 (en) * | 1985-02-12 | 1986-08-14 | Kjell Budal | Arrangement for controlling wave forces on bodies submerged in a fluid |
-
1991
- 1991-12-17 GB GB9126753A patent/GB2262572B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1986004646A1 (en) * | 1985-02-12 | 1986-08-14 | Kjell Budal | Arrangement for controlling wave forces on bodies submerged in a fluid |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2386160A (en) * | 2002-01-04 | 2003-09-10 | Technologies Ltd Ocean | Variable geometry magnus effect turbine |
| GB2425154A (en) * | 2005-04-12 | 2006-10-18 | Green Cat Renewables Ltd | Wave powered turbine |
| WO2009018524A3 (en) * | 2007-08-02 | 2010-04-08 | Douglas Joel S | Magnus force fluid flow energy harvester |
| US7986054B2 (en) | 2007-08-02 | 2011-07-26 | Egen Llc | Magnus force fluid flow energy harvester |
| WO2009097855A2 (en) * | 2008-02-06 | 2009-08-13 | Oxydice A/S | A device for converting wave energy into mechanical energy |
| WO2009097855A3 (en) * | 2008-02-06 | 2009-10-22 | Oxydice A/S | A device for converting wave energy into mechanical energy |
| WO2010085615A3 (en) * | 2009-01-26 | 2010-11-04 | Egen Llc | Fluid flow energy harvester |
| US8671675B2 (en) | 2009-03-26 | 2014-03-18 | Nguyen Huu Cuong | Wave powered electric generator system |
| WO2010111354A1 (en) * | 2009-03-26 | 2010-09-30 | Nguyen Huu Cuong | Wave powered electric generator system |
| US7994651B2 (en) * | 2010-09-27 | 2011-08-09 | Dov Frishberg | Apparatus for converting the energy of waves on a body of water |
| CN105508127A (en) * | 2016-01-19 | 2016-04-20 | 曲阜师范大学 | Multi-joint stretchable rod type wave power generation system |
| CN105508127B (en) * | 2016-01-19 | 2017-11-24 | 曲阜师范大学 | Multinode Telescopic shaft type Wave energy generating system |
| ES2684449A1 (en) * | 2017-03-29 | 2018-10-02 | Francisco Javier CASTIÑEIRAS CERNEIRA | HYDRAULIC GENERATOR (Machine-translation by Google Translate, not legally binding) |
| CN111878291A (en) * | 2020-07-31 | 2020-11-03 | 魏谦 | Ocean current energy power generation device |
| GB2625082A (en) * | 2022-12-03 | 2024-06-12 | Desmond Lewis Stephen | Reduced cost tidal and/or water flow power generator |
| WO2024123188A1 (en) | 2022-12-07 | 2024-06-13 | World Wide Wind Tech As | Contra-rotating wave turbine (crwt) |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2262572B (en) | 1995-01-25 |
| GB9126753D0 (en) | 1992-02-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19961217 |