Ocean wave energy converter

• US 4,672,222 A
• Filed: 03/13/1986
• Issued: 06/09/1987
• Est. Priority Date: 03/13/1986
• Status: Expired due to Fees

• Current Assignee: P. Foerd Ames
• Original Assignee: P. Foerd Ames
• Inventors: Ames, P. Foerd
• Primary Examiner(s): Shoop, Jr., William M.
• Assistant Examiner(s): Duncanson, Jr., W. E.
• Application Number:
  US06/782,798
• Time in Patent Office: 453 Days
• Field of Search: 290/42-44, 290/52-54, 60/495-507, 417/330-334
• US Class Current: 290/53
• CPC Class Codes: F03B 13/1895 where the tie is a tension/compression member
• CPC Class Codes: Y02E 10/30 Energy from the sea, e.g. using wave energy or salinity gradient

Abstract

A self-stabilized and modularly expandable system of independently operative point absorbers with respective drive transmissions and electrical generators produces electricity from wave motion on a body of water.

Claims

1. Apparatus for converting the energy of wave motion on the surface of a body of water to electricity comprising:

(a) a plurality of lower structural support means approximately forming edge elements of an equilateral triangle;

(b) a plurality of lower tube receptacles connected to said lower structural support means approximately forming vertex elements of an equilateral triangle;

(c) a plurality of tubular members having upper and lower portions positioned within said tube receptacles approximately forming trimetric edge elements of a right conical frustum;

(d) a separable buoyancy device affixed to the upper portions of said tubular members above said lower structural support means, said buoyancy device having upper and lower surfaces and an enclosed space therein;

(e) an annulated receptacle plate affixed to said upper surface of said buoyancy device;

(f) a plurality of truncated right circular cylinders connected to said annulated receptacle plate extending outwardly in coaxial alignment with respective tubular members;

(g) a plurality of articulated brackets connected to said annulated receptacle plate in radial extension;

(h) a plurality of upper structural support means connected to said articulated brackets in radial extension for connection to other receptacle plate articulated brackets of a module array;

(i) dual rolling contact support means comprising open linear slide bearings operatively positioned within said tube upper portions and said truncated cylinders.

2. the apparatus recited in claim 1, further including:

(a) a reciprocable driveshaft having upper and lower ends and a coaxially extending rack longitudinally supported in rolling contact engagement within said linear slide bearings wherein said rack protrudes in the bearing openings thereby inhibiting driveshaft axial torque and whereby the axis of said reciprocation is inclined from vertical orientation for increasing stroke length and duration of wave engagement;

(b) a universal or flexible joint operatively connected to said driveshaft upper end;

(c) a separable float device operatively connected to said universal or flexible joint, said float device having upper and lower surfaces and an enclosed space therein;

(d) a removable stop affixed to said driveshaft lower end;

(e) shock absorbing means operatively positioned within said tubular members for contacting said stop for limiting upward and downward strokes and reducing load transfer;

(f) continuous rotary motion generation means operatively connected in driving engagement with said reciprocable driveshaft;

(g) transmission means and electrical energy production means operatively connected in driving engagement with said continuous rotary motion generation means.

3. The apparatus recited in claim 2, wherein transmission means and electrical energy production means comprise a harmonic drive operatively connected in driving engagement with said continuous rotary motion generation means and a single direct current generator wherein said transmission means are adapted to vary the gear speed ratio and torque relations for maximally increasing output velocity in accordance with an extensive range of water wave conditions.

4. The apparatus recited in claim 2, wherein transmission means and electrical energy production means comprise an internal gear operatively connected with said continuous rotary motion generation means and a plurality of operatively meshing pinion gears operatively connected in driving engagement with a plurality of direct current generators arranged in close-packed configuration wherein fixed gear speed ratio and torque relations are preselected for increasing output velocity in accordance with a predetermined average range of water wave conditions.

5. The apparatus recited in claim 2, wherein continuous rotary motion generation means comprise, (a) a rack meshing spur gear affixed on a freely rotatable axle positionally secured in rolling contact engagement with radial bearings whereby said axle is extended from at least one side of said radial bearings, (b) an overrunning clutch having inner and outer portions affixed on said axle extension whereby said clutch inner portion provides numerous positively engaging load points with said clutch outer portion in one direction of rotation and lift-off disengagement in the opposite direction of rotation, (c) a flywheel operatively connected with said overrunning clutch for being driven in one direction of continuous rotation by momentum of a plurality of discrete weight elements fixedly superposed between support frames mounted to said clutch outer portions and wherein said elements are incrementally movable as required for adjusting loads in congruence with long term environmental effects or intercomponent adaptation at the point of assembly.

6. The apparatus recited in claim 5, wherein said flywheel weight elements are shaped as disks with relatively uniform thickness between said clutch outer portions and said flywheel outer portions.

7. The apparatus recited in claim 5, wherein said flywheel weight elements are shaped as rims, or segmented rim portions thereof, and concentratively positioned about said flywheel periphery for increasing overturning inertia in relation to loading.

8. The apparatus recited in claim 2, wherein said float device lower surfaces are shaped in generally planar form for increasing hydroface resistance and quick actuation after submergence and upper surfaces are shaped in generally hemispherical form radially symmetrical about the associated universal or flexible joint center of gyration, said radial length being preselected for prohibiting contact interference with other respective floats in normal operation and whereby said float lower surface is naturally adjustable for optimizing the orientation of planar surface resistance in relation to procession of continuously changing wave forms.

9. The apparatus recited in claim 1, wherein said buoyancy device upper surfaces are shaped in generally conical form for upwardly redirecting at least some water wave laminar flow toward float devices.

10. The apparatus recited in claim 2, wherein said float device enclosed space contains closed cell foam for prohibiting water infiltration and increasing float shell resistance to breaks and/or punctures whereby said shell wall thickness and weight is accordingly reduced in comparison to the required wall thickness and weight of a float device devoid of interiorly disposed closed cell foam.

11. The apparatus recited in claim 1, further including removable damper plates adapted to be carried on lower structural support means for stabilizing a module, or plurality of modules, as required.

12. The apparatus recited in claim 2, further including proportionately diminished transmission means and electrical energy production means adapted to be utilized in relatively large modules for converting the less forceful energy of downward driveshaft and float movement.

13. The apparatus recited in claim 1, wherein respective articulated brackets and upper structural support ends further include modified quick disconnect couplings for sealing end openings and electrical leads and conductors against water penetrations when detached.

14. The apparatus recited in claim 2, wherein ends of universal or flexible joints connecting a respective float and driveshaft are freely rotatable for inhibiting axial torque in normal operation.