Power plants – Motor having a buoyant working member – Working member actuated by the rise and fall of a surface of...
Patent
1995-04-07
1997-12-30
Lazarus, Ira S.
Power plants
Motor having a buoyant working member
Working member actuated by the rise and fall of a surface of...
60497, 60499, 417331, F03B 1312
Patent
active
057017409
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for a buoy-based wave power apparatus, where the buoy coacts with a cylinder/piston arrangement which is connected to the sea bottom, and where the arrangement is provided wit valve means allowing fluid flow through a piston and possibly a piston rod in said arrangement.
U.S. Pat. No. 4,218,192 discloses a device of said type where liquid may flow through piston and piston rod and where the production equipment proper is located within the buoy, and outside flexible hose being arranged for recirculation of the liquid flowing in a closed system. The pressure establishment is made on the top side of the piston. The device produces energy only at downward stroke caused by the heavy weight of the buoy. The construction is firmly anchored to the sea bottom, and can not submerge in bad weather, which makes it quite vulnerable to damages and in addition wear at the lead-through of the piston rod into the cylinder. A specific problem related to the know device is also that generated energy is brought ashore by means of an electric cable attached to buoy. This cable will therefor be subjected to great dynamic stresses, and is vulnerable to damage or complete breakdown.
For further elucidation of the prior art it is referred to U.S. Pat. No. 4,742,241 which discloses an embodiment with a flow-through of liquid in piston and piston-rod, the piston-rod being fitted to a fixed frame at both ends and where a plurality of cylindrical buoys are operating in the same frame system. The piston rod extends through both inflow and pressure chamber. There is in addition installed a specific type of valve control means in the piston.
U.S. Pat. No. 4,914,915 relates to a sea bed fixed installation with liquid flow-through through a turbine located within the piston. The piston-rod is here working as compact rotation shaft connected to a generator located at the top of the installation. The buoy is located externally of the cylinder and is movable up and down therealong, which causes the generator and turbine as well as the piston to move simultaneously with the buoy. The device implies an extensive concrete structure extending from the sea bed and well above maximum wave height. The installation must therefore at any time extend well above the sea surface, and the buoy is designed to have a roller connection with the inside of the cylinder face of the concrete structure.
British patent 1478312 relates to a device having a buoy which via a universal joint is connected to a cylinder/piston arrangement, where water can be pumped out from the top or bottom of the cylinder during movement of the buoy. The cylinder is in addition anchored to the sea bed in a non-turnable fashion.
For further elucidation of the prior art relating to wavepower apparatus and anchoring systems of constructions below water, it is referred to WO81/03358 (PCT/GB80/00091) and Norwegian patent application No. 850602 and Norwegian patent No. 148650.
Neither of the prior art embodiments have been able to present a wavepower apparatus which is characterized by an inexpensive and simple production, suitable installation and good possibilities for convenient demounting in connection with repair work. The system is easy to adapt to different fields of use, e.g. for making pressurized air, lifting of water, production of electric current, pressure making through the liquid-osmosis principles, forming of sound (e.g. by pressurized air), light-buoys etc.
The characteristic features of the invention will appear from the subsequent patent claims and from the subsequent description with reference to the enclosed drawings which show with regard to the invention non-limitative embodiments of the device according to the invention.
FIG. 1 shows a first embodiment of the device according to the invention.
FIG. 2 shows a second embodiment of the device according to the invention.
FIG. 3 shows a third embodiment of the device according to the invention.
FIG. 4 shows a fourth embodiment of the device according to the invention.
FIG. 5 show
REFERENCES:
patent: 644093 (1900-02-01), Place
patent: 3515889 (1970-06-01), Kammerer
patent: 4076463 (1978-02-01), Welczer
patent: 4218192 (1980-08-01), West
patent: 4742241 (1988-05-01), Melvin
patent: 5179837 (1993-01-01), Sieber
Basichas Alfred
Lazarus Ira S.
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