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WO2008067572A2 - Energy from wave motion - Google Patents

Energy from wave motion Download PDF

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Publication number
WO2008067572A2
WO2008067572A2 PCT/ZA2007/000081 ZA2007000081W WO2008067572A2 WO 2008067572 A2 WO2008067572 A2 WO 2008067572A2 ZA 2007000081 W ZA2007000081 W ZA 2007000081W WO 2008067572 A2 WO2008067572 A2 WO 2008067572A2
Authority
WO
WIPO (PCT)
Prior art keywords
pontoons
energy
arms
motion
rise
Prior art date
Application number
PCT/ZA2007/000081
Other languages
French (fr)
Other versions
WO2008067572A3 (en
Inventor
Manuel Ferreira Da Costa
Original Assignee
Da Costa, Carl
Da Costa, Adrian
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Da Costa, Carl, Da Costa, Adrian filed Critical Da Costa, Carl
Publication of WO2008067572A2 publication Critical patent/WO2008067572A2/en
Publication of WO2008067572A3 publication Critical patent/WO2008067572A3/en

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
    • F03B13/1815—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 an up-and-down movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/90—Mounting on supporting structures or systems
    • F05B2240/93—Mounting on supporting structures or systems on a structure floating on a liquid surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/40—Transmission of power
    • F05B2260/406—Transmission of power through hydraulic systems
    • 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

Definitions

  • This invention relates to the derivation of energy from wave motion, and particularly from the wave motion of the sea, dams, rivers or lakes.
  • Patent WO2004063562 Japanese et al
  • a guided floating body moves in a captive air tank so that the movement of the submerged tank is opposite to that of the floating body, the resultant motion being transferred into energy.
  • Patent W03098033 (Raj) a guided float moves a pinion gear of a turbine for the generation of power.
  • Patent WO 0165112 has a floating chamber with a water plane area so that its vertical oscillations are damped relative to the height of the waves, and has an inlet facing into a wave train and vertical side plates that deliver compressed air to an outlet in the container.
  • GB2210667 (McMonagle) has a float mounted in a frame which can be moved vertically the accommodate changes in tide level.
  • the float has a linkage to a piston and cylinder by means of a cam that moves in response to the movement of the float to pump hydraulic or pneumatic fluid.
  • GB2063373 comprised hinged pontoons, the hinges including flexible elements that reduce in cross-section with radial displacement from the centre of the hinge and that constitute pump chambers discharging into a turbine.
  • a Japanese device involved an oscillating water column to illuminate navigational buoys while the National Engineering Laboratory worked on a similar concept but was very wide for a small electrical output.
  • the Bristol Oscillating cylinder moved in response to wave motion and its movement was transmitted to pumps at the base of the mooring tubes.
  • a device for converting wave motion into energy includes one or more floating pontoons adapted to be located at right angles to wave propagation, the pontoons having one or more articulated arms for rise and fall motion relative to the pontoon/s in sympathy with the wave motion, and means associated with the arm/s for converting the motion into a form of energy.
  • the pontoons are spaced apart in substantial parallel or near-parallel relationship and the arms span the distance between the pontoons.
  • the arms may be in the form of pairs, each arm of a pair being associated with a pontoon and being joined across the distance between the pontoons by means of a floating member.
  • the extremities of the arms may include connectors to hydraulic cylinders, linear electric generators, rotary electric generators or other devices for converting the rise and fall of the arms to a form of energy.
  • the energy converters are ideally located inside the pontoons where they are protected from the sea water.
  • Figure 1 is an isometric representation of the concept of the invention
  • Figure 2 is a cross-sectional view through a pontoon
  • Figure 3 is a detailed cross-sectional view thereof.
  • a pair of pontoons 10, 12 is shown in Figure 1 in parallel relationship. They are joined at their ends by cross formations 14.
  • the pontoons are spanned by floating members 20 between pairs of arms 22 that are journalled inside the pontoons.
  • the pontoons float on the surface 24 of the sea and the arms rise and fall with the motion of the waves as shown in Figure 2, the rise and fall being relative to the rise and fall of the pontoons.
  • the number of torque arm pontoons 22, incorporated on each generator will ensure that the power available from each wave/swell will be harnessed to the maximum, as each wave flows/travels through the generator.
  • the rise and fall of the arms is used to actuate the piston of a hydraulic cylinder 30 as shown in the cut away portion of Figure 3.
  • the energy derived is additive.
  • the rise and fall of the floating arms may, alternatively, be used to drive a linear generator or a reverse helical shaft.
  • the pontoons are anchored to the sea bed by means of a cable 32.
  • H is the wave height in metres
  • T is the wave period (crest to crest) in seconds.

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)
  • Revetment (AREA)

Abstract

A device for converting wave motion into energy has one or more pontoons (10, 12) that are located at right angles to the wave propagation. The pontoons are spaced apart in substancially paralled relationship and one or more floating members (20) span the distance between the pontoons. The pontoons have pairs of articulated arms connected to the extremities of the floating members and that rise and fall with the motion of the waves relative to the rise and fall of the pontoons. The extremities of the arms are connected to energy converters located inside the pontoons.

Description

ENERGY FROM WA VE MOTION
TECHNICAL FIELD OF THE INVENTION
This invention relates to the derivation of energy from wave motion, and particularly from the wave motion of the sea, dams, rivers or lakes.
BACKGROUND ART
Many ingenious devices have been proposed for the derivation of energy from the sea and the majority of these have involved the provision of a float that moves with the standing waves and the conversion of this reciprocatory motion to the production of an electrical charge or into pneumatic or hydraulic energy.
An example of the latter is Patent WO2004063562 (Joaquin et al) in which a guided floating body moves in a captive air tank so that the movement of the submerged tank is opposite to that of the floating body, the resultant motion being transferred into energy.
In Patent W03098033 (Raj) a guided float moves a pinion gear of a turbine for the generation of power.
Patent WO 0165112 (Kemp) has a floating chamber with a water plane area so that its vertical oscillations are damped relative to the height of the waves, and has an inlet facing into a wave train and vertical side plates that deliver compressed air to an outlet in the container.
In GB2210667 (McMonagle) has a float mounted in a frame which can be moved vertically the accommodate changes in tide level. The float has a linkage to a piston and cylinder by means of a cam that moves in response to the movement of the float to pump hydraulic or pneumatic fluid. GB2063373 comprised hinged pontoons, the hinges including flexible elements that reduce in cross-section with radial displacement from the centre of the hinge and that constitute pump chambers discharging into a turbine.
In Christopher Cockerell's invention (GB1571283) interconnected members, at least one of which was buoyant, were connected by hydraulic rams so that their movements relative to one another could be converted into electrical energy.
None of these reached commercial success mainly because they had to be of such a great size that they were uneconomical.
Several ideas were thoroughly investigated, such as the "Salter Duck" that comprised a float that nodded in the manner of a duck. A gyroscope mounted inside the duck rotated on its axis as a result of this motion and this caused pumps arranged on rings above and below the gyroscope to pump fluid to a generator.
A Japanese device involved an oscillating water column to illuminate navigational buoys while the National Engineering Laboratory worked on a similar concept but was very wide for a small electrical output.
The Bristol Oscillating cylinder moved in response to wave motion and its movement was transmitted to pumps at the base of the mooring tubes.
It is an object of the present invention to provide a small unit that is capable of producing substantial energy.
DISCLOSURE OF THE INVENTION
According to the invention a device for converting wave motion into energy includes one or more floating pontoons adapted to be located at right angles to wave propagation, the pontoons having one or more articulated arms for rise and fall motion relative to the pontoon/s in sympathy with the wave motion, and means associated with the arm/s for converting the motion into a form of energy. In a preferred form of the invention the pontoons are spaced apart in substantial parallel or near-parallel relationship and the arms span the distance between the pontoons.
The arms may be in the form of pairs, each arm of a pair being associated with a pontoon and being joined across the distance between the pontoons by means of a floating member. The extremities of the arms may include connectors to hydraulic cylinders, linear electric generators, rotary electric generators or other devices for converting the rise and fall of the arms to a form of energy.
The energy converters are ideally located inside the pontoons where they are protected from the sea water.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention is described below with reference to the accompanying drawings, in which
Figure 1 is an isometric representation of the concept of the invention;
Figure 2 is a cross-sectional view through a pontoon; and
Figure 3 is a detailed cross-sectional view thereof.
BEST MODE FOR CARRYING OUR THE INVENTION
A pair of pontoons 10, 12 is shown in Figure 1 in parallel relationship. They are joined at their ends by cross formations 14.
The pontoons are spanned by floating members 20 between pairs of arms 22 that are journalled inside the pontoons.
The pontoons float on the surface 24 of the sea and the arms rise and fall with the motion of the waves as shown in Figure 2, the rise and fall being relative to the rise and fall of the pontoons. The number of torque arm pontoons 22, incorporated on each generator will ensure that the power available from each wave/swell will be harnessed to the maximum, as each wave flows/travels through the generator.
The rise and fall of the arms is used to actuate the piston of a hydraulic cylinder 30 as shown in the cut away portion of Figure 3. As each arm is similarly configured, the energy derived is additive.
The rise and fall of the floating arms may, alternatively, be used to drive a linear generator or a reverse helical shaft.
The pontoons are anchored to the sea bed by means of a cable 32.
It has been calculated that the available power from wave motion is according to the following equation
Power (kW/m) = k H2T 0.5 H2T
Where k is a constant, H is the wave height in metres, and T is the wave period (crest to crest) in seconds.

Claims

CLAIMS:
1. A device for converting wave motion into energy including one or more floating pontoons adapted to be located at right angles to wave propagation, characterised in that the pontoons have one or more articulated arms for rise and fall motion relative to the pontoon/s in sympathy with the wave motion, and means associated with the arm/s for converting the motion into a form of energy.
2. A device according to claim 1 characterised in that the pontoons are spaced apart in substantial parallel or near-parallel relationship and the arms span the distance between the pontoons.
3. A device according to either of the above claims characterised in that the arms are in the form of pairs, each arm of a pair being associated with a pontoon and being joined across the distance between the pontoons by means of a floating member.
4. A device according to any of the above claims characterised in that the extremities of the arms include connectors to hydraulic cylinders, linear electric generators, rotary electric generators or other devices for converting the rise and fall of the arms to a form of energy.
5. A device according to claim 4 characterised in that the energy converters are located inside the pontoons.
PCT/ZA2007/000081 2006-12-01 2007-11-27 Energy from wave motion WO2008067572A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA2006/10853 2006-12-01
ZA200610853 2006-12-01

Publications (2)

Publication Number Publication Date
WO2008067572A2 true WO2008067572A2 (en) 2008-06-05
WO2008067572A3 WO2008067572A3 (en) 2008-08-28

Family

ID=39462192

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/ZA2007/000081 WO2008067572A2 (en) 2006-12-01 2007-11-27 Energy from wave motion

Country Status (1)

Country Link
WO (1) WO2008067572A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2475405A (en) * 2009-11-11 2011-05-18 David Bowerman Wave energy generator for harvesting kinetic energy of waves and tidal flow
CN110425077A (en) * 2019-07-22 2019-11-08 山东大学 A kind of float type wave energy power generation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US855258A (en) * 1906-03-16 1907-05-28 John W Neal Wave-motor.
GB104157A (en) * 1916-02-12 1918-01-31 Antonio Manganella Di Giovanni Improvements in Wave-Motors.
GB237807A (en) * 1925-01-20 1925-08-06 Odoardo Harley Di San Giorgio Improvements in means for the utilisation of wave movement for producing motive power
FR2532691A1 (en) * 1982-09-07 1984-03-09 Garzon Astete Jorge System for transforming wave energy from the sea into mechanical energy
GB2434620A (en) * 2006-01-28 2007-08-01 John Charlton Gaunt Rocking beam type wave generator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US855258A (en) * 1906-03-16 1907-05-28 John W Neal Wave-motor.
GB104157A (en) * 1916-02-12 1918-01-31 Antonio Manganella Di Giovanni Improvements in Wave-Motors.
GB237807A (en) * 1925-01-20 1925-08-06 Odoardo Harley Di San Giorgio Improvements in means for the utilisation of wave movement for producing motive power
FR2532691A1 (en) * 1982-09-07 1984-03-09 Garzon Astete Jorge System for transforming wave energy from the sea into mechanical energy
GB2434620A (en) * 2006-01-28 2007-08-01 John Charlton Gaunt Rocking beam type wave generator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2475405A (en) * 2009-11-11 2011-05-18 David Bowerman Wave energy generator for harvesting kinetic energy of waves and tidal flow
GB2475405B (en) * 2009-11-11 2012-09-19 David Bowerman Wave powered generator
CN110425077A (en) * 2019-07-22 2019-11-08 山东大学 A kind of float type wave energy power generation
CN110425077B (en) * 2019-07-22 2024-04-09 山东大学 Float type wave energy power generation device

Also Published As

Publication number Publication date
WO2008067572A3 (en) 2008-08-28

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