Floating drum turbine for electricity generation

Abstract

A floating drum turbine is used for generating the electrical energy from the kinetic energy of a water stream (sea wave or river flow) that provides the mechanical energy needed to rotate an electrical generator for generating the electricity. The drum turbine is installed on a buoyant skid anchored to the seabed by some chains/ropes to keep it in a fixed position and direction along the water stream. The turbine is coupled to an electrical generator with a power transmission system, and generates the electricity that is transferred to the coast using a cable system floated on the water surface.

Claims

1. A floating drum turbine, which is used for generating electricity from kinetic energy of a water stream that provides mechanical energy needed to rotate an electrical generator, comprising: a drum turbine configured to get the mechanical energy of the water stream that converts linear force of the water stream into a rotational torque, a buoyant skid floated on the water stream to support the drum turbine; two bearing housings mounted on the buoyant skid to support the drum turbine; the electrical generator rotated by the drum turbine to generate the electricity; a counterweight box configured to balance the buoyant skid; two base frames configured, one for mounting the electrical generator on the buoyant skid, and another one for mounting the counterweight box on the buoyant skid; a power transmission system configured to transfer generated torque by the drum turbine to the electrical generator; chains/ropes configured for anchoring the buoyant skid to seabed.

2. The floating drum turbine of claim 1, wherein the drum turbine comprises longitudinal-radial curved blades surrounded by side plates that arc connected to a central shaft; major parameters of the drum turbine are drum length and drum diameter that directly determine amount of the generated torque by the drum turbine.

3. The floating drum turbine of claim 1, wherein the buoyant skid comprises two hollow capsules, each has a diverter in front portion to increase water stream velocity acting on the said drum turbine, and a guide blade in bottom portion to keep the buoyant skid along the water stream; the hollow capsules are connected by two rafters to form the buoyant skid.

4. The floating drum turbine of claim 1, wherein the bearing housings are mounted on the said buoyant skid to support the said drum turbine that is adjusted by placing shim plates under the bearing housings to merge drum turbine blades fully into the water stream; merge depth is an essential parameter of the said drum turbine to enhance kinetic energy conversion into electrical energy.

5. The floating drum turbine of claim 1, wherein the base frames are mounted on the said buoyant skid over the said bearing housings to support the electrical generator and the counterweight box.

6. The floating drum turbine of claim 1, wherein the power transmission system comprises a belt and two pulleys to transfer the generated torque of the said drum turbine to the electrical generator.

7. The floating drum turbine of claim 1, wherein the chains/ropes are used for anchoring the said buoyant skid to the seabed to keep it in a fixed position on the water stream; reaction forces applied to the said drum turbine by the water stream are absorbed by the chains/ropes.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is an operational drawing of the invented floating drum turbine.

(2) FIG. 2 is a 2D drawing of a floating drum turbine showing its components, including section and side views of the invented turbine.

(3) FIG. 3 is a 3D drawing of a floating drum turbine.

DESCRIPTION OF THE INVENTION

(4) The operation method of this invention is shown in FIG. 1, a floating drum turbine with some longitudinal radial blades that floats on a water stream, and be anchored to the seabed that is rotated by the water stream pushing the turbine blades. The drum length and diameter are the major parameters of the turbine that directly determine the amount of the generated mechanical energy. The turbine floats on the water surface using a buoyant skid mounted below the turbine shaft bearing housings. The buoyant skid consists of two rafter connected hollow capsules, each has a diverter in the front portion to increase the stream velocity acted on the turbine blades, and a guide blade in the bottom portion to keep the skid along the water stream. The skid is anchored to the seabed by some chains/ropes to keep it in a fixed position. The turbine's merge depth into the water is an essential parameter of the system for enhancing the kinetic energy conversation into the electrical energy that is adjusted by placing some shim plates under the bearing housings to merge the turbine blades fully into the water stream.

(5) The major components of this invention are shown in FIG. 2, which includes the turbine side plates 1, a turbine shaft 7, the turbine blades 8, two bearing housings 3, two hollow capsules 2 associated with two guide blades 9, two rafters 11, two base frames 4, an electrical generator 5, a counterweight box 6, and a power transmission system 10 (including a belt and two pulleys installed on the shafts of the turbine and generator).

(6) The drum turbine consists of three major parts 1, 7, and 8. The bearing housings 3 enable the turbine to rotate freely, and transfers the generated torque to the generator shaft through a power transmission system 10 for generating the electricity. The generated electricity is transferred to the coast using a floating cable system. Two base frames 4 are for mounting the generator 5 and the counterweight box 6 that balances the turbine set. The reaction forces, applied to the turbine set by the water stream, are absorbed by anchoring the turbine to the seabed. The hollow capsules 2 are connected to each other by two rafters 11.

(7) To decrease the turbine's moment of inertia that eases rotation, the turbine blades and side plates are made from a low-weight materials like as aluminum alloys or FRP materials that are able to resist against the sea water for the corrosion/erosion protection, and the turbine shaft that is a hollow shaft made from stainless steel pipes to present high strength. The hollow capsules and associated guide blades are made from FRP materials for resisting against the sea water for the corrosion/erosion protection. The base frames, rafters, and counterweight box are made from galvanized steel materials for the corrosion protection.