Modular Hydro-Kinetic Power Source

Abstract

A modular system of generating electrical power from mechanical energy of kinetic motion originating in current, waves, and tides, where the system resembles natural habitat and illustrates options for optimizing the transmission of current through the system. One or more branches elongate members containing current generators extend up from the bottom of a body of water. The elongate members move with water, in the manner of kelp, to actuate the current generators, and thus transform mechanical energy due to forces inherent in a body of water to electrical power.

Claims

1. A hydro-kinetic power source to generate power from movement of a body of water, the hydro-kinetic power source comprising: a flexible elongate member having a member length extending vertically from an anchor point toward a surface of the body of water; and a generator affixed to the elongate member, the generator to generate power responsive to flexing of the elongate member.

2. The power source of claim 1, wherein the generator is one of a plurality of generators placed vertically along the member length, the generators to generate power responsive to flexing of the elongate member at respective positions along the member length.

3. The power source of claim 2, further comprising a relay coupled to the generators to combine the power from the generators and transmit the combined power.

4. The power source of claim 2, the elongate member comprising joints, each of the generators resisting articulation of at least one of the joints.

5. The power source of claim 1, wherein the power from the generator is electrical power.

6. The power source of claim 1, further comprising an anchor anchoring the flexible elongate member to an aquatic floor beneath the body of water.

7. The power source of claim 6, further comprising a pivot between the flexible elongate member and the anchor.

8. The power source of claim 1, wherein the elongate member envelopes the generator.

9. The power source of claim 1, wherein the elongate member is buoyant.

10. The power source of claim 1, where the elongate member is fully submerged in the body of water.

11. The power source of claim 1, where the elongate member has an asymmetrical horizontal cross section along most of the member length.

12. The power source of claim 1, further comprising a trunk system electrically coupled to the generator.

13. The power source of claim 12, further comprising a second flexible elongate member having: a second member length extending vertically from toward the surface of the body of water; and a second generator affixed to the second elongate member and electrically coupled to the trunk system, the second generator to generate power responsive to flexing of the second elongate member.

14. The power source of claim 1, the elongate member including a disconnect mechanism to the anchor point.

15. The power source of claim 14, wherein the disconnect member comprises a twist seal.

16. The power source of claim 1, further comprising an anchor coupled to the anchor point to affix the elongate member to an aquatic floor.

17. The power source of claim 12, that supports additional trunk systems.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The detailed description is illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar elements and in which:

[0019] FIG. 1 depicts hydro-kinetic power source 100 that generates power from the movement of a body of water 105.

[0020] FIG. 2 depicts a generator 200 that can be used for generators 125 in one embodiment.

[0021] FIG. 3 depicts a hydro-kinetic power source 300 in accordance with another embodiment.

[0022] FIG. 4 shows a cross-sectional view of an aquatic body equipped with a hydro-kinetic power source 400.

[0023] FIG. 5A is a cross section of a spherical turbine blade 500 for omnidirectionally extracting hydrodynamic kinetic energy.

[0024] FIG. 5B depicts a gimballed power source 510 that allows turbine blade 500 of FIG. 5A to rotate along two axes supported by a pair of rings 515 and 520 pivoted at right angles.

[0025] FIG. 5C depicts a hydro-kinetic power source 535 incorporating columns of gimballed power sources 510 of FIG. 5B all connected physically and electrically to a trunk system 540.

DETAILED DESCRIPTION

[0026] FIG. 1 depicts hydro-kinetic power source 100 that generates power from the movement of a body of water 105. Power source 100 includes flexible, elongate members 110 each of a member length and extending vertically from an anchor point 115 toward the surface 120 of water body 105. Members 110 are equipped with generators 125 that are activated by tidal flow, waves, and surge current 130 as members 110 move about like kelp. Generators 125 convert kinetic energy to electrical energy. A relay platform 135 relays electrical energy to wherever it is needed via a conduit within a trunk section 140 along the bottom 145 of water body 105. Power source 100 can have multiple members 110 each exploiting movement near the respective position. Power source 100 can thus exploit complex eddy currents and changing current and surge directions. Relay 135 combines power from generators 125 for transmission.

[0027] In this embodiment, elongate members 110 are relatively rigid with generators 125 positioned at joints where they resist articulation to generate electrical power. Relay platform 135 includes and anchor (not shown) that secures power source 100 to the aquatic floor. The bottom-most member 110, and thus the entire flexible systems of members 110, can be connected to relay platform 135 via a pivotal connection. Generators 125 can be external to members 110, or all or part of each generator can be enveloped within the members. Members 110 and generators 125 are collectively buoyant, and various types of floating elements can be added to facilitate buoyancy. Members 110, tubes in this example, can have other cross-sectional shapes, or can have a blend of different shapes. In one embodiment, for example, member 110 proximal relay platform 135 are cylindrical, while distal members 110 are e.g. flat or cruciform in cross section to increase resistance to flow. Some embodiments include a mix of flexible and inflexible members. Some embodiments include piezoelectric generators that produce an electric charge in response to mechanical stresses imposed between or within members 110.

[0028] FIG. 2 depicts a generator 200 that can be used for generators 125 in one embodiment. Orthogonal gears 205 and 210 cause pivotal motion along a vertical axis to rotate the shaft of an electric generator 215. A weight 217 responds to movement by inducing circular motion of gear 205, which in turn rotates gear 210 and coaxial magnetic coil assembly 215. Electrical energy produced by this action is conveyed to relay platform 135 via a cable 220.

[0029] FIG. 3 depicts a hydro-kinetic power source 300 in accordance with another embodiment. Flexible elongate members 305 of e.g. circular cross section include energy-harvesting yarns of e.g. carbon nanotubes (CNTs) that stretch or twist with movement of the elongate members. The energy-harvesting yarns of CNT are coated or immersed within an ionically conducting material, an electrolyte (not shown). A voltage develops across the yarn when stretched or twisted in the electrolyte. This voltage inspires current flow and the resultant power is conveyed to an attached relay platform 135. A trunk system 140 conveys power from one or more relay platform 135 to a relay station 310, which conditions and conveys that power to the grid, represented here as power lines 315.

[0030] Members 305 can branch in the manner of e.g. kelp, and some of member 305 can be replaced with ridged members. may include ridged members and generators of the type detailed in connection with FIG. 1. Hydro-kinetic power sources of the type disclosed herein enhance aquatic habitat and protect aquatic life, particularly when groups of three or more flexible elongate members are collocated within e.g. 24 inches. Such collections create artificial kelp beds that offer shelter to species of aquatic life.

[0031] Trunk section 140 holds each elongate member at or within proximity to the bottom. An optimum depth for the trunk system may be within 10 meters of the water surface, or as identified per location, to optimize the cost of the system and forces originating from the body of water, ease of maintenance, and the cost and efficiency of power transfer. The highest points of power source 300 can be spaced from surface 120 to prevent interference with e.g. ships and bathers.

[0032] Relay platforms 135 may include one or more cables encased in an environmentally protective layer or coating and may be submerged or above ground. Relay platforms 135 conduct the energy pulled from each current generator to optimize the transmission of power through the system. They connect into a form of circuit or switch at the base of each elongate member. Similarly, multiple generator bodies optimize the transmission of energy by mapping into a separate system of circuits and switches. This system, relay platform, connects into the power transmission module. The relay platform connects via wired or wireless connections into the power transmission module, which then connects into either a power grid or energy storage facility.

[0033] Power transmission module 310 may connect to one or more short-distance or long-distance power lines, connecting to a public or private energy backbone or grid for widespread access to the power generated. Similarly, power may be collected in an energy storage facility, such as a system of accumulators or batteries, whether by coil, layer, or other. All materials with contact to water and the outside environment can be encased in polymers and metals formed of non-corroding materials, with a protective coating.

[0034] FIG. 4 shows a cross-sectional view of an aquatic body equipped with a hydro-kinetic power source 400. In this view, aquatic forces, such as river and ocean current or waves would be flowing into the page, with a river bank off the page to the left and right, or going into (or away) from shore in a lake, sea, or ocean, etc. Anchors 405 or other adhering system secures a trunk system 410 on or near the aquatic body floor. There are a multitude of mechanisms to secure such anchor or adhering system. Elongate members 415 are attached to trunk system 410 via pre-configured connectors 420, which can be included for ease of assembly, maintenance, or extensibility.

[0035] FIG. 4 includes an expanded view of one embodiment of a connector 420 and corresponding end of an elongate member 415. To allow for ease of installation and removal, connector 420 may be done in water with pressures consistent to the depths for placement of the trunk and base of an elongate body. A water- and air-tight seal 425 along the base of an elongate member, allowing a firm seal to the trunk, also helps align the corresponding elongate member with its wiring connection(s) and those in the trunk. Threads 430 and O-ring 435 support a twist-and-lock second seal. The end of the elongate member 415 may hold a contour (such as concave were trunk to be oval or round, or precut to a special shape cutout commensurate with the circumference of elongate member 415) allowing it to fit into trunk 410. When a person or machine attaches the elongate member to the trunk, the base of the elongate member touches one or more (two shown) seals in the trunk. With contact of the elongate member to the trunk, water gets forced away from the one or more seals, out from the base, with water not pushed away between the seals and the bottom of the elongate member flowing out through one or more small holes 440. Once the elongate member connects into the trunk, it may be further locked into place by e.g. tabs 445 that set and lock into seal 425 A tab or tabs 445 secure each elongate member 415 to trunk 410 and further ensure proper member orientation, which can be important for proper wire connections.

[0036] A means for conveying the power generated from each generator 125 runs the length of each elongate member 415 and connects into trunk 410. With one embodiment, the means of conveying the power run continuously through each elongate member and trunk, but the optional embodiment shown FIG. 4 is modular, with one or more tabs ensuring proper alignment of this means of conveying the power seamlessly from each elongate member through the trunk, while also providing an additional means of attachment between the elongate member and the trunk.

[0037] FIG. 5A is a cross section of a spherical turbine blade 500 for omnidirectionally extracting hydrodynamic kinetic energy. Asymmetrical blade elements 505 cause blade 500 to rotate on its axis responsive to flow in any direction parallel with the plane of the page.

[0038] FIG. 5B depicts a gimballed power source 510 that allows turbine blade 500 of FIG. 5A to rotate along two axes supported by a pair of rings 515 and 520 pivoted at right angles. Though not shown, power source 510 includes a generator that turns with blade 500 and conductors that send power so generated through one or both of a pair of supporting members 530.

[0039] FIG. 5C depicts a hydro-kinetic power source 535 incorporating columns of gimballed power sources 510 of FIG. 5B all connected physically and electrically to a trunk system 540. Supporting members 530 are rigid. Blades 500 turn responsive to flow through power source 535 in any direction and can thus capture energy from complex, unpredictable flow patterns.

[0040] While the subject matter has been described in connection with specific embodiments, other embodiments are also envisioned. For example, generators noted previously can generate and transmit AC or DC power, pressurized gas, or hydraulic fluid. Therefore, the spirit and scope of the appended claims should not be limited to the foregoing description. Only those claims specifically reciting means for or step for should be construed in the manner required under the sixth paragraph of 35 U.S.C. 112.