U.S. patent application number 13/159419 was filed with the patent office on 2011-12-15 for methods and devices for converting wave energy into rotational energy.
Invention is credited to NETANEL RAISCH.
Application Number | 20110304145 13/159419 |
Document ID | / |
Family ID | 45095631 |
Filed Date | 2011-12-15 |
United States Patent
Application |
20110304145 |
Kind Code |
A1 |
RAISCH; NETANEL |
December 15, 2011 |
METHODS AND DEVICES FOR CONVERTING WAVE ENERGY INTO ROTATIONAL
ENERGY
Abstract
The invention discloses devices and methods for converting wave
energy to rotational energy. Specifically, the invention allows for
two or more flotation elements to move in opposite directions in
response to a wave contacting a wave energy transducer according to
embodiments of the present invention. Motion of the flotation
elements leads to rotation of associated wheel assemblies, thus
allowing for generation of rotational energy and by extension,
electricity.
Inventors: |
RAISCH; NETANEL; (Psagot,
IL) |
Family ID: |
45095631 |
Appl. No.: |
13/159419 |
Filed: |
June 14, 2011 |
Current U.S.
Class: |
290/53 ;
60/497 |
Current CPC
Class: |
F03B 13/20 20130101;
Y02E 10/38 20130101; F03B 13/1865 20130101; Y02E 10/30
20130101 |
Class at
Publication: |
290/53 ;
60/497 |
International
Class: |
F03B 13/18 20060101
F03B013/18 |
Claims
1. A device for converting wave energy into rotational energy,
including the following: a first flotation element including an
upper wheel assembly and a lower wheel assembly, said lower wheel
assembly being below water level during action of said device; a
second flotation element, smaller than and independent in
individual motion of said first flotation element; a chain, wherein
said chain is attached at a first end to said second flotation
element and is adapted to rotate said lower wheel assembly and
transfer change in potential energy of said first floatation
element to mechanical rotational energy, and said chain further
passing the upper wheel assembly; and, an anchor, wherein said
anchor is attached to a second end of said chain and remains
effectively unmoved during the action of said device.
2. The device according to claim 1, wherein said rotational energy
is employed in the generation of electricity.
3. The device according to claim 2, wherein said device is a
plurality of devices.
4. The device according to claim 1, further including a motor, said
motor being associated with a wheel assembly.
5. The device according to claim 1, wherein said anchor sits on a
water bed.
6. The device according to claim 1, wherein said device is realized
as a buoy.
7. A device for converting wave energy into rotational energy,
including the following: a first flotation element including an
upper wheel assembly and a lower wheel assembly, said lower wheel
assembly being below water level during action of said device; a
second flotation element, smaller than and independent in
individual motion of said first flotation element; a chain, wherein
said chain is attached at a first end to said second flotation
element and is adapted to rotate said upper wheel assembly and
transfer change in potential energy of said first floatation
element to mechanical rotational energy, and wherein said chain is
attached at a second end to the sea floor.
8. The device according to claim 7, wherein said cable is attached
to a cement block on said sea floor.
9. The device according to claim 7, wherein said device is used in
the production of electricity.
10. The device according to claim 7, wherein said rotational energy
is employed in the compression of liquid or gas.
11. The device according to claim 7, wherein said device could be
part of a raft or ship.
12. The device according to claim 4, further including an
electrical system for local off-grid uses.
13. The device according to claim 4, further including a light and
adapted for use as lighthouse or marking buoy.
14. The device according to claim 1 wherein said device includes a
gear system to convert turns of said wheels to larger turns of a
component associated with a motor.
15. The device according to claim 4, wherein there is a load on a
shaft associated with said motor.
16. The device according to claim 4, wherein there is no load on
said motor.
17. A method for converting wave energy to rotational motion,
including the following: providing a buoy having a first flotation
element including an upper wheel assembly and a lower wheel
assembly, said lower wheel assembly being below water level, a
second flotation element, smaller than and motion independent of
said first flotation element and, a cable, wherein said cable is
attached at a first end to said second flotation element and is
attached at a second end to a water bed, and wherein said cable is
adapted to pass above and rotate said upper wheel assembly and pass
beneath and rotate said lower wheel assembly; placing said buoy
into a body of water so that said first flotation element and said
second flotation element are on the surface of said body of water;
anchoring said buoy through said cable to said bed of said body of
water; allowing action of waves to raise said first flotation
element and concomitantly sink said second flotation element,
wherein the motion of said second flotation element allows for the
rotation of said upper wheel assembly and said lower wheel
assembly; and, allowing action of said waves to lower said first
flotation element and concomitantly raise said second flotation
element, wherein the motion of said second flotation element allows
for the rotation of said upper wheel assembly and said lower wheel
assembly.
18. The method according to claim 17, furthering including the step
of generating electricity from said rotation of said upper wheel
assembly and said lower wheel assembly.
19. The method according to claim 17, wherein said cable may be
comprised of a cable and a chain in a row.
20. The method according to claim 17, wherein there is further
included a system adapted to convert rotation in two directions to
rotation in a single predetermined direction rotation.
Description
FIELD AND BACKGROUND OF THE INVENTION
[0001] The present invention, in some embodiments thereof, relates
to devices and methods for efficiently converting energy associated
with water waves into rotational energy, but not exclusively, to
methods for effectively producing electrical energy from wave
action.
[0002] There is a tremendous push in the world toward "renewable"
energy sources. While solar and wind have been of the dominant
varieties of alternative electricity sources, waves from the oceans
could power a significant portion of the world electrical demand
(see for example:
http://peswiki.com/index.php/Directory:Ocean_Wave_Enemy). As with
any form of energy supplied to the world public, wave-based
electricity must be price competitive with other energy sources.
Creating electricity is not the same as providing electricity in
quantities and at prices that allow for its use in the electrical
grid.
[0003] Wave-based electrical generators have been prepared and
different versions have been used in sea trials, though none is
commercially in use. While each system has unique features as well
as performance specifications, most use the same basic physics of a
wave driving either a linear or rotary element to eventually create
electricity.
[0004] U.S. patent application Ser. No. 12/221,407 to Kim, et al
describes electricity generation from the ocean wave by use of
mechanical systems, submerged or on surface, collecting energy day
and night regardless weather condition in a way similar to the way
of collecting energy by use of solar panels or wind mills, without
contacting the salty ocean water. The principal mechanism invented
is as follows. Swinging of a heavy mass due to the ocean wave
generates torque that sways gear wheel in clockwise or
counterclockwise, thus transmitting the torque energy to two gear
wheels that separate clockwise swing and counterclockwise swing via
two sets of spring-piston clutching system and by use of gear
chain, either converting clockwise swing to counterclockwise swing
or vise versa such that the back and forth motion of the mass
transforms into unidirectional rotation that rotates the rotor of
electricity generator.
[0005] U.S. patent application Ser. No. 12/248,575 to Rasmussen
teaches systems and methods are disclosed for harnessing wave
energy. In one embodiment, a wave energy conversion device
comprises a buoyant component connected to a generator such that
wave energy is transferable from the buoyant component to the
generator. A restricting mechanism connected with the buoyant
component, is configured to selectively restrict the buoyant
component from rising strictly along with passing waves. The
restricting mechanism may be selectively released at an optimal
time during a passing wave. In some embodiments, a system may
include an array of wave energy conversion devices and a
communications network. The communications network may allow for
each of the buoyant components in the array to be released at an
optimal time in sequential fashion
[0006] U.S. patent application Ser. No. 12/867,431 to Sidenmark
describes a wave energy converter including a buoy and a
transmission unit. In the transmission unit there is a driveshaft,
which is driven to rotate either when the buoy rises or sinks, yet
always in the same direction. The driveshaft is mechanically
coupled to one of the rotating parts of an electric generator and
drives this to generate electric current. Further on there is an
energy accumulation device, which is also coupled to the driveshaft
to accumulate energy when the buoy rises or sinks and the
driveshaft rotates and which is then used to drive the generator at
the other of the rising and sinking motions. The coupling between
the energy accumulation device and the driveshaft can go by the
generator's second rotatable part, the air gap between the
generator's parts and the generator's first part. The coupling over
the air gap gives a torque, which drives the second part to rotate
along and which also counteracts the rotation of the driveshaft.
The generator's second part is driven by the energy accumulation
device to rotate in the other direction, when the torque from the
driveshaft does not exceed the counteracting torque.
[0007] U.S. Pat. No. 4,568,836 to Reenberg teaches an apparatus for
converting wave energy to electrical energy in a sea environment
comprises a flotation duck anchored to the sea bottom and a turbine
assembly pivotally connected thereto comprising an air chamber
partially filled with liquid and/or granular particles having a
turbine mounted on the upper portion thereof. The turbine is either
self-rectifying or with a flap valve controlled entrance to the air
chamber. A generator is coupled to the turbine and driven thereby.
In operation, the motion of the waves causes the liquid and/or
granular particles to compress the air within the chamber which is
then used to drive the turbine. The spent air is fed back into the
air chamber from the turbine as wave motion continues. In alternate
embodiments the turbine generator assembly is mounted to the upper
portion of an air chamber open to the sea on the bottom in an
apparatus which rotates about a fixed or stable central axis.
Gearing arrangements to drive the generator either alone or in
combination with a liquid or air turbine drive are also disclosed.
Compression of the air within the chamber or liquid, as the case
may be, drives the turbine. Multiple assemblies may be readily
coupled together to generate electrical energy in commercially
practical quantities.
[0008] U.S. patent application Ser. No. 12/698,779 to Bender
describes a power generating device comprising a weight suspended
from a buoy via a zip-line and at least two gears disposed on said
zip-line which are coupled to drives shafts, which in turn are
couple to electric generators. The device converts the mechanical
power of oscillating ocean waves into electricity.
[0009] U.S. Pat. No. 7,012,340 to Yi teaches an ocean wave energy
conversion apparatus including a float adapted to ride on the
surface of the ocean in reciprocal vertical motion in response to
ocean wave front action and a lever adapted to ride on the surface
of the ocean. The lever has one end coupled to the float. A fulcrum
pivotally supports the lever. A magnet is coupled to the other end
of the lever. Parallel stator cores having electric coils wound
thereon together with the magnet form a magnetic circuit. Springs
are adjacent the magnet and interconnected to the lever and the
magnet. A barrier is disposed between adjacent stator cores. The
upward motion of the float caused by impact of waves will move the
magnet downward by the lever and compresses the springs. Downward
motion of the float will move the magnet upward by the lever and
expand the springs. Repeated movement of the magnet will induce a
voltage in the electric coils.
[0010] The prior art generally describes production of electrical
energy through the movement of weights with concomitant generation
of electrical energy.
SUMMARY OF THE INVENTION
[0011] It is therefore a purpose of the present invention, in some
embodiments, to describe methods and devices for converting wave
energy into rotational energy, the rotational energy being, in some
embodiments, being further converted to electricity.
[0012] The invention includes a device for converting wave energy
into rotational energy, including the following: a first flotation
element including an upper wheel assembly and a lower wheel
assembly, the lower wheel assembly being below water level during
action of the device; a second flotation element, smaller than and
independent in individual motion of the first flotation element; a
chain, wherein the chain is attached at a first end to the second
flotation element and is adapted to rotate the lower wheel assembly
and transfer change in potential energy of the first floatation
element to mechanical rotational energy, and the chain further
passing the upper wheel assembly; and, an anchor, wherein the
anchor is attached to a second end of the chain and remains
effectively unmoved during the action of the device.
[0013] In one aspect of the device, the rotational energy is
employed in the generation of electricity.
[0014] In another aspect of the device, the device is a plurality
of devices.
[0015] In another aspect of the device, there is additionally a
motor being associated with a wheel assembly.
[0016] In another aspect of the device, the anchor sits on a water
bed.
[0017] In another aspect of the device, the anchor is realized as a
weight.
[0018] In another aspect of the device, there is additionally an
electrical cable for dispatching electricity generated by the motor
to an electrical grid.
[0019] In another aspect of the device, the device is realized as a
buoy.
[0020] In another aspect of the device, the wheel assembly includes
teeth adapted for interaction with the chain.
[0021] In another aspect of the device, the rotational energy is
employed in water pumping.
[0022] In another aspect of the device, the rotational energy is
employed in the compression of liquid or gas.
[0023] In still another aspect of the device, the device could be
part of a raft or ship.
[0024] In another aspect of the device, there is additionally an
electrical system for local off-grid uses.
[0025] In another aspect of device, there is additionally a light
and adapted for use as lighthouse or marking buoy.
[0026] In another aspect of the device, there is additionally a
gear system to convert turns of the wheels to larger turns of a
component associated with a motor.
[0027] In another aspect of the device, there is a load on a shaft
associated with the motor.
[0028] In another aspect of the device, there is no load on the
motor.
[0029] In another aspect of the device, the chain may be comprised
of a cable and a chain in a row.
[0030] In another aspect of the device, there is further included a
system adapted to convert rotation in two directions to rotation in
a single predetermined direction rotation.
[0031] The invention additionally includes a device for converting
wave energy into rotational energy, including the following: a
first flotation element including an upper wheel assembly and a
lower wheel assembly, the lower wheel assembly being below water
level during action of the device; a second flotation element,
smaller than and independent in individual motion of the first
flotation element; a chain, wherein the chain is attached at a
first end to the second flotation element and is adapted to rotate
the upper wheel assembly and transfer change in potential energy of
the first floatation element to mechanical rotational energy, and
wherein the chain is attached at a second end to the sea floor.
[0032] In one aspect of the device, the cable is attached to a
cement block on the sea floor.
[0033] In another aspect of the device, the device is used in the
production of electricity.
[0034] In another aspect of the device, the device is a plurality
of devices.
[0035] The invention additionally provides for a method for
converting wave energy to rotational motion, including the
following: providing a buoy having a first flotation element
including an upper wheel assembly and a lower wheel assembly, the
lower wheel assembly being below water level, a second flotation
element, smaller than and motion independent of the first flotation
element and, a cable, wherein the cable is attached at a first end
to the second flotation element and is attached at a second end to
a water bed, and wherein the cable is adapted to pass above and
rotate the upper wheel assembly and pass beneath and rotate the
lower wheel assembly; placing the buoy into a body of water so that
the first flotation element and the second flotation element are on
the surface of the body of water; anchoring the buoy through the
cable to the bed of the body of water; allowing action of waves to
raise the first flotation element and concomitantly sink the second
flotation element, wherein the motion of the second flotation
element allows for the rotation of the upper wheel assembly and the
lower wheel assembly; and, allowing action of the waves to lower
the first flotation element and concomitantly raise the second
flotation element, wherein the motion of the second flotation
element allows for the rotation of the upper wheel assembly and the
lower wheel assembly.
[0036] In one aspect of the method, the lower wheel is associated
with an electric motor.
[0037] In another aspect of the method, there is an additional step
of generating electricity from the rotation of the upper wheel
assembly and the lower wheel assembly.
[0038] In another aspect of the method, there is an additional step
of transferring the electricity from the buoy to an electrical
grid.
[0039] In another aspect of the method, the buoy is realized as a
plurality of buoys.
[0040] In another aspect of the method, the electricity is used to
power the buoy.
[0041] In another aspect of the method, the cable is realized as a
chain adapted to rotate teeth associated with the upper wheel
assembly and the lower wheel assembly.
[0042] In another aspect of the method, there is additionally a
system placed between the wheel and motor for conversion of two
directions of rotation of said wheel to one direction of rotation
and could optionally to a higher rate of revolution.
[0043] In another aspect of the method, the cable may be comprised
of a cable and a chain in a row.
[0044] In another aspect of the method, there is additionally
included a system adapted to convert rotation in two directions to
rotation in a single predetermined direction rotation.
[0045] Unless otherwise defined, all technical and/or scientific
terms used herein have the same meaning as commonly understood by
one of ordinary skill in the art to which the invention pertains.
"Buoy", "flotation element", "gear", "cable", "chain", "motor",
"anchor", "wheel assembly", "sprocket", and other relevant terms
may have their standard meanings as applied in the appropriate
arts, unless otherwise defined in the instant invention. A chain
may include a chain and a cable.
BRIEF DESCRIPTION OF THE DRAWINGS
[0046] Some embodiments of the invention are herein described, by
way of example only, with reference to the accompanying drawings.
With specific reference now to the drawings in detail, it is
stressed that the particulars shown are by way of example and for
purposes of illustrative discussion of embodiments of the
invention. In this regard, the description taken with the drawings
makes apparent to those skilled in the art how embodiments of the
invention may be practiced. It is noted that similar elements in
various drawings will have the same number, advanced by the
appropriate multiple of 100.
[0047] In the drawings:
[0048] FIG. 1 is a schematic representation of wave energy amenable
to conversion to rotational energy;
[0049] FIG. 2A is a schematic representation of an embodiment of
the instant invention;
[0050] FIGS. 2B-2D show schematic views of the steps of energy
transduction of an embodiment of the present invention;
[0051] FIG. 3 is a schematic representation of an alternative
embodiment of the present invention;
[0052] FIGS. 4A & 4B are schematic representations of still
another embodiment of a wave to rotational energy device;
[0053] FIG. 5 is a schematic representation of another embodiment
of the present invention;
[0054] FIG. 6A shows details of an electricity generating module
associated with an embodiment of the present invention;
[0055] FIG. 6B shows further detail of the mechanism for converting
rotational energy to a single direction;
[0056] FIG. 7 is a schematic representation of electricity
generation according to an embodiment of the present invention;
[0057] FIG. 8 is a schematic representation of a field of devices
according to an embodiment of the present invention for the purpose
of generating MW levels of electricity;
[0058] FIG. 9 shows a schematic representation of an embodiment of
the present invention with a weight in place of anchor; and,
[0059] FIG. 10 shows a flowchart associated with a method of the
present invention.
DESCRIPTION OF SPECIFIC EMBODIMENTS OF THE INVENTION
[0060] The present invention, in some embodiments thereof, relates
to converting the energy associated with waves into rotational
energy and, more particularly, but not exclusively, to methods and
devices for producing grid-deliverable electricity from wave
energy.
[0061] For purposes of better understanding some embodiments of the
present invention, as illustrated in FIGS. 1-10 of the drawings,
reference is first made to FIG. 1 which shows a general conceptual
schematic for a wave that could be used for production of
rotational energy. Water waves have associated energies and are
produced by a variety of factors; their intensity and frequency,
critical for energy extraction, are related to these factors
(http://en.wikipedia.org/wiki/Water_waves):
[0062] The great majority of large breakers one observes on a beach
result from distant winds. Five factors influence the formation of
wind waves: [0063] Wind speed [0064] Distance of open water that
the wind has blown over (called the fetch) [0065] Width of area
affected by fetch [0066] Time duration the wind has blown over a
given area [0067] Water depth
[0068] All of these factors work together to determine the size of
wind-generated water waves. The greater each of the variables, the
larger the waves. Waves are characterized by: [0069] Wave height
(from trough to crest) [0070] Wavelength (from crest to crest)
[0071] Wave period (time interval between arrival of consecutive
crests at a stationary point) [0072] Wave propagation direction
[0073] Waves in a given area typically have a range of heights. For
weather reporting and for scientific analysis of wind wave
statistics, their characteristic height over a period of time is
usually expressed as significant wave height. This figure
represents an average height of the highest one-third of the waves
in a given time period (usually chosen somewhere in the range from
20 minutes to twelve hours), or in a specific wave or storm system.
Given the variability of wave height, the largest individual waves
are likely to be about twice the reported significant wave height
for a particular day or storm.
[0074] FIG. 1 shows a wave 110 heading towards a shore 120. The
wave has a wave height and groups of waves have an associated
wavelength. Energy stored in the moving wave is delivered to shore
(often as sound and froth) and then the remaining return wave heads
out to sea, thus creating a trough. Energy associated with a wave
is most closely associated with wave height, wave speed and the
wave period.
First Embodiment
[0075] Attention is turned to FIG. 2A, which shows a schematic view
of an embodiment of the instant invention. A wave energy transducer
200 includes a first flotation element 230, a second flotation
element 240, an upper wheel assembly 250, a lower wheel assembly
260, and an anchor 275. At a resting state between or in the
absence of waves, both flotation elements sit on the face of a body
of water 205 where the transducer 200 is present. The wave energy
transducer 200 works on a unique concept in which a passing wave
(not shown) will necessarily raise the first flotation element 230,
as floating materials generally rise with each passing wave. The
second flotation element 240 is significantly smaller than the
first flotation element 230 and is also attached via a chain or
cable 290 to said anchor 275. Thus, when a wave passes the wave
energy transducer 200, the first flotation element 230 is raised
with the height of the wave, while the smaller second flotation
element 240 is transiently sunken into the water. The second
flotation element 240 is necessarily sunken into the water due the
presence of a cable 290 attached anchor 275 which may rest on a
seabed 207. Thus during a wave event, the first flotation element
230 goes up, while concomitantly the second flotation element 240
goes down. The associated chain or cable 290 associated with the
second flotation element 240 turns the upper wheel assembly 250 and
the lower wheel assembly 260. It is thus through the wave action
that wave energy is efficiently converted to rotational energy,
primarily associated with the action of the at least two wheel
assemblies 250 & 260.
[0076] In FIG. 2A, the upper wheel assembly 250 is attached to gear
wheels 285 that may be further attached to generator 280. It is
noted that either wheel assembly may stand as an independent
element, may be associated with an electricity production apparatus
or may be associated directly or otherwise with elements that make
benefit from rotation of a wheel assembly such as but not limited
to a propeller screw or other rotational element.
[0077] It is appreciated that additional elements not shown in FIG.
2A may be associated with the wave energy transducer 200. For
example, GPS transponder, computer, lighting, armament, power
cables, buoy markings, and other elements may optionally be
associated with a transducer.
[0078] It is stressed that in the present invention, there is no
requirement for enormous counterweights which are often used in
prior art systems. Rather, the differential size of the at least
two flotation elements in association with an anchor or attachment
to the ocean floor guarantees that only one flotation element rises
with the impending wave, while the other, smaller, flotation
element necessarily sinks. The first flotation element 230 is
generally at least twice the size of the second flotation element
240, though this ratio can be higher or lower, according to needs
of the transducer 200. After the wave has passed, the rotation
elements return to their prior positions, namely the first
flotation element 230 "comes down" on the back side of the wave
crest to the original sea level, while the second flotation element
240 comes back up from the depths to again return to sea level.
This return to position also drives the cable 290 through the upper
wheel assembly 250 and lower wheel assembly 260, thus guaranteeing
additional rotational energy transduction with each passing wave.
It is noted that the lower wheel assembly 260 is always beneath sea
level, whereas the upper wheel assembly 250 can be either above sea
level, at sea level or at times beneath sea level.
[0079] Attention is now turned to FIGS. 2B-2D which show the
"lifecycle" of a wave energy transducer 200 in its interaction with
a wave. FIG. 2B shows a wave energy transducer 200 at rest in water
205, namely the first flotation element 230 and the second
flotation element 240 are at rest, floating in the water. An
anchoring element 275 is solidly attached to the ocean floor 207.
Cable 290 is attached to said anchoring element 275, passes over
upper wheel assembly 250 and under lower wheel assembly 260 before
terminating at the smaller second flotation element 240. The cable
290 is of a length to allow the two flotation elements to rest in
flat water, with the cable being taught in its disposition.
[0080] Attention is turned to FIG. 2C, which shows the wave energy
transducer 200 during its interaction with a wave 210, wherein the
transducer 200 sits in this view on the wave 210 crest. As
expected, the first flotation element 230 rises with the impending
wave 210. Under other conditions, the second flotation element 240
would also rise with the wave 210; in the present invention, the
intentionally smaller second flotation element 240 necessarily
sinks in the wave due to the cable 290 connecting the second
flotation element 240 to the anchoring element 275. Thus, as shown
in the figure, a separation space 295 is created between the first
flotation element 230 and the second flotation element 240. During
the time when this separation space 295 is created, cable 290
rotates the upper wheel assembly 250 or a portion thereof and the
lower wheel assembly 260 or a portion thereof. Thus, by separating
flotation elements according to size and the connection of one
flotation element 240 to a fixed anchoring element 275, wave energy
is converted to rotational energy in the wheel assemblies. One can
use the rotational energy either directly or indirectly to generate
electricity or rotational mechanical energy.
[0081] Attention is turned to FIG. 2D, which shows the wave
transducer 200 after the wave 210 has passed and the wave energy
transducer 200 is sitting in a trough 215 between waves 210. The
larger first flotation element 230 has gone down and sits on the
trough 215. The smaller second flotation element (not visible in
figure) has risen from the depths of the sea (or other water
source) and is again floating, this time in the trough 215. The
movement of the flotation elements towards the trough 215 again
turns the upper wheel assembly 250 and lower wheel assembly 260 via
the cable 290, this time the rotation being in a direction opposite
that when the transducer 200 passed over the wave (see FIG. 2C).
The invention thus creates rotational energy both in reaching the
crest of a wave 210 and in coming back down into the trough (FIG.
2D, 215) after a wave 210. As discussed in a further embodiment,
the rotation of the wheel assemblies in opposite directions during
a full wave cycle can be converted to rotation in a single
direction and alternatively at a higher rate of rotation through
appropriate gears and other elements.
[0082] It is noted that the length of the cable may be important
for efficient energy conversion by the wave energy transducer. The
cable 290 is generally attached to the seabed or other water bed.
It is strung through the wheel assemblies and finally attached to
the smaller second flotation element. If the cable 290 is too
short, the second flotation element will be partially submerged and
will have limited travel distance when a wave passes. If the cable
290 is too long, wave passage will not lead to sinking of the
smaller flotation element. Thus, cable 290 should be of a length to
allow both flotation elements to sit on a calm water surface but
should generally not be significantly shorter or longer, unless
there is a reason for such a modification. The cable 290 will be
adapted to be easily modified for length based on changing water
conditions such as tides.
[0083] At the end of the process, the energy transducer 200 returns
to its starting condition as shown in FIG. 2B.
Second Embodiment
[0084] Attention is turned to FIG. 3 which shows a schematic view
of an alternative embodiment of the present invention. A wave
energy transducer 300 is shown in its resting position when the sea
305 is "flat" and not encountering waves. Conical first flotation
element 330 is outside of and significantly larger than conical
second flotation element 340. The first flotation element 330 (or
alternatively a collection of flotation elements that collectively
serve as a first flotation element 330) is generally twice as large
as the second flotation element 340, though the specific size ratio
may vary according to application and specific embodiment. Anchor
370 rests on sea floor 307 and is attached to cable 390 which is
further threaded through upper wheel assembly 350 and lower wheel
assembly 360 before being finally attached to said second flotation
element 340. As shown in FIG. 3, in its resting state, the wave
energy transducer 300 has first flotation element 330 and second
flotation element 340 both floating on the sea 305. When a wave
passes by (not shown), the flotation elements move in opposite
directions: the larger first flotation element 330 rises with the
wave, while the smaller, anchored second flotation element 340 is
driven into the body of the sea. Cable 390 rotates upper wheel
assembly 350 and lower wheel assembly 360, thus converting energy
associated with a propagated water wave into rotational energy. The
rotating wheel assemblies can be associated with elements that
convert the rotational energy into motion, electricity, or any
other desired energetic outcome. In FIG. 3, a battery 385 for the
wave energy transducer 300 is associated with the lower wheel
assembly 360 and powers the device which can serve as a buoy or
beacon for shipping.
[0085] One will note that the wave energy transducer 300 includes a
shaft 365 which houses the lower wheel assembly 360, portions of
the cable 390 that run through the lower wheel assembly 360 and the
battery 385. The shaft may be open or partially sealed, may float
or may either rest or be anchored to the sea floor 307.
Third Embodiment
[0086] Attention is turned to FIG. 4A which shows an alternative
embodiment of the present invention. A wave energy transducer 400
includes a shaft 465 that is open to water around it both at its
top and its bottom. A second flotation element 440 is located
inside the shaft 465 and may move down and up inside the shaft 465
as a function of wave interaction with the transducer 400. The
first flotation element 430 is actually realized as two unique
flotation elements 430 placed on either side of the partially
submerged shaft 465. An anchor 470 is located at the end of cable
490 running from the second flotation element 440 and passing
through the upper wheel assembly 450 and lower wheel assembly 460.
Cable 490 could alternatively be attached to a large weight or the
seabed itself (neither shown in figure). The cable 490 is adapted
to pass around both wheel assemblies and to thus rotate the wheel
assemblies as second flotation element 440 initially is sunk by
wave presence and then elevated after a wave has passed. A battery
485 associated with lower wheel assembly 460 receives energy
generated through the wave-specific rotation of lower wheel
assembly 460.
[0087] Cable 490 may be realized as a chain that allows for spokes
from the wheel assemblies to pass through it (FIG. 4B). The chain
491 includes spacing 492 for receiving spokes 493 from a sprocket
494 associated with a wheel assembly. Chain 491 dressed around
sprocket 494 of wheel assembly is adapted to rotate sprocket 494
and thus wheel assembly (not shown) and any associated rotational
elements including but not limited to a rotating element of an
electrical generator.
Fourth Embodiment
[0088] Attention is now turned to FIG. 5 which shows a schematic
view of an additional embodiment of the present invention. A wave
energy transducer 500 includes a plurality of wheel assemblies 555
which are adapted to be rotated by a cable 590 whose penultimate
ends are an anchor 570 and a second flotation element 540 which is
half the size or less than a first flotation element 530. Multiple
wheel assemblies 555 aid in more efficient cable motion and
potentially higher efficiencies of energy conversion between wave
motion and rotational energy realized in the wave energy transducer
500.
Fifth Embodiment
[0089] Attention is now turned to FIG. 6A which shows a gear system
682 that may be associated with an embodiment of the present
invention. Gear 685 is rotated by chain or cable (not shown for
purposes of clarity) as described in previous embodiments. The gear
685 is associated with a two-way to one-way rotation converter 686,
as the gear rotates in both clockwise and counterclockwise
directions during a single wave pulse. The converter 686 converts
all gear 685 rotation into a single direction of rotation for
conversion of wave to rotational energy. The converter 686 is
connected to a step-up gear 687 that typically has a ratio of 50:1
or 100:1 to increase the percentage of wave energy that is realized
as usable rotational energy. Finally, the step-up gear 687 is
connected to a motor/generator 680 that can generate electricity
through the appropriate rotation of magnet, rotor or the like to
allow for production of electricity from rotational energy. The
gear system 682 thus takes wave energy via a wheel
assembly-associated gear 685 and allows for conversion of said
energy into electricity which can be used on-site or transferred
elsewhere. Rotation of gear 685 is specifically dependent on wave
action as described in the first embodiment of the instant
invention.
[0090] FIG. 6B shows greater detail of the gear 685 function in
transduction of wave energy to rotational energy. With movement of
flotation elements (not shown), chain 690 rotates gear 685
associated with wheel assembly 655; gear 685 in turn rotates a
plurality of gears 687 associated with a backstop freewheel system.
As depicted in FIG. 6B, the upper gears 693 rotate shaft 691 only
when chain 690 rotates gear 685 in a clockwise direction; lower
gears 692 do not function at all. When chain 690 rotates gear 685
in a counterclockwise direction, lower gears 692 rotate shaft 691
in the same direction 696 as before, while upper gears 692 do not
function. The plurality of gears 687 aids in efficiently converting
the wave-specific rotation of wheel assembly 655 gear 685 into
single-direction rotational energy as shown in FIG. 6A.
Sixth Embodiment
[0091] Attention is turned to FIG. 7 which shows an embodiment of
the invention used for production of electricity. A wave energy
transducer 700 is shown with separation of first flotation element
730 and second flotation element 740 that occurs when the
transducer 700 is lifted by a wave (not shown). Cable 790 attached
to an anchoring element rotates a lower wheel assembly 760 which is
associated with an electrical generator 780. Electricity generated
by the electrical generator 780 is sent by a transmission cable to
an electrical grid (not shown). Optional stabilizers 295 are also
shown.
Seventh Embodiment
[0092] Attention is turned to FIG. 8 which shows an embodiment of
the present invention. A plurality of wave energy transducers 800
are placed in the sea 805, wherein said transducers 800 are
anchored to the seabed 807. Waves passing through the field 802 of
transducers 800 will cause the action of each transducer 800 to
convert wave energy into rotational energy and optionally into
electricity which can be taken from the field 802 with an
appropriate set of transmission wires (not shown). Note that
different transducers 800 can be in wave crest 810 or trough 815 at
the same time.
Eighth Embodiment
[0093] Attention is turned to FIG. 9 which shows a schematic view
of an embodiment of the present invention. The wave energy
transducer 900 includes a weight 977 in place of anchor, said
weight either resting on seabed 907 or being suspended in the sea,
as a function of the cable 990 length. In such an embodiment, the
transducer 900 may be held in place by a separate line 995 or other
means. It is assumed that the transducer will remain generally in a
single location during the time of its use.
Ninth Embodiment
[0094] FIG. 10 shows a method of the present invention. The method
includes providing a buoy having a first flotation element
including an upper wheel assembly and a lower wheel assembly, the
lower wheel assembly being below water level, a second flotation
element, smaller than and motion independent of the first flotation
element and, a cable, wherein the cable is attached at a first end
to the second flotation element and is attached at a second end to
a water bed, and wherein the cable is adapted to pass above and
rotate said upper wheel assembly and pass beneath and rotate the
lower wheel assembly; placing the buoy into a body of water so that
the first flotation element and the second flotation element are on
the surface of the body of water; anchoring the buoy through the
cable to the bed of said body of water; allowing action of waves to
raise the first flotation element and concomitantly sink the second
flotation element, wherein the motion of the second flotation
element allows for the rotation of the upper wheel assembly and the
lower wheel assembly; and, allowing action of the waves to lower
the first flotation element and concomitantly raise the second
flotation element, wherein the motion of the second flotation
element allows for the rotation of the upper wheel assembly and the
lower wheel assembly.
[0095] It is expected that during the life of a patent maturing
from this application, additional wave-based energy systems will be
developed, and the scope of the term of the invention is intended
to include all such new technologies a priori.
[0096] As used herein the term "about" refers to .+-.10%.
[0097] The terms "comprises", "comprising", "includes",
"including", "having" and their conjugates mean "including but not
limited to".
[0098] The term "consisting of means "including and limited
to".
[0099] The term "consisting essentially of" means that the, method
or structure may include additional ingredients, steps and/or
parts, but only if the additional ingredients, steps and/or parts
do not materially alter the basic and novel characteristics of the
claimed composition, method or structure.
[0100] As used herein, the singular form "a", "an" and "the"
include plural references unless the context clearly dictates
otherwise. For example, the term "a compound" or "at least one
compound" may include a plurality of compounds, including mixtures
thereof.
[0101] Throughout this application, various embodiments of this
invention may be presented in a range format. It should be
understood that the description in range format is merely for
convenience and brevity and should not be construed as an
inflexible limitation on the scope of the invention. Accordingly,
the description of a range should be considered to have
specifically disclosed all the possible subranges as well as
individual numerical values within that range. For example,
description of a range such as from 1 to 6 should be considered to
have specifically disclosed subranges such as from 1 to 3, from 1
to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6 etc., as
well as individual numbers within that range, for example, 1, 2, 3,
4, 5, and 6. This applies regardless of the breadth of the
range.
[0102] Whenever a numerical range is indicated herein, it is meant
to include any cited numeral (fractional or integral) within the
indicated range. The phrases "ranging/ranges between" a first
indicate number and a second indicate number and "ranging/ranges
from" a first indicate number "to" a second indicate number are
used herein interchangeably and are meant to include the first and
second indicated numbers and all the fractional and integral
numerals therebetween.
[0103] Although the invention has been described in conjunction
with specific embodiments thereof, it is evident that many
alternatives, modifications and variations will be apparent to
those skilled in the art. Accordingly, it is intended to embrace
all such alternatives, modifications and variations that fall
within the spirit and broad scope of the appended claims. The
present invention could be employed for a wide variety of
embodiments with differentially sized flotation elements as
herewith described.
[0104] It is appreciated that certain features of the invention,
which are, for clarity, described in the context of separate
embodiments, may also be provided in combination in a single
embodiment. Conversely, various features of the invention, which
are, for brevity, described in the context of a single embodiment,
may also be provided separately or in any suitable subcombination
or as suitable in any other described embodiment of the invention.
Certain features described in the context of various embodiments
are not to be considered essential features of those embodiments,
unless the embodiment is inoperative without those elements.
[0105] All publications, patents and patent applications mentioned
in this specification are herein incorporated in their entirety by
reference into the specification, to the same extent as if each
individual publication, patent or patent application was
specifically and individually indicated to be incorporated herein
by reference. In addition, citation or identification of any
reference in this application shall not be construed as an
admission that such reference is available as prior art to the
present invention. To the extent that section headings are used,
they should not be construed as necessarily limiting.
* * * * *
References