An energy conversion device is disclosed. Some embodiments include a mounting system for mounting the device in a fluid, an axle fixed to the mounting system, a hollow shell that rotates about the axle having axial symmetry about a longitudinal axis. The hollow shell may be substantially rounded at the front, expanding to a maximum diameter less than half the distance from the front end to the back end, and tapering radially along the longitudinal axis to the back end. The energy device may further comprise a plurality of blades on the exterior of the hollow shell, each blade extending from the front end of the hollow shell to the back end, rising to a maximum height, and having concave and convex walls. Other embodiments are described and claimed.

A gravity driven hydroelectric system, whereby hydroelectric power is developed from potential energy of dammed water driving a water turbine assembly. The hydroelectric power extracted from the water depends on volume and on a difference in height between a source and an outflow of the water. A penstock delivers the water to the water turbine assembly. The penstock has a housing secured by frame assemblies to a structure. The housing has electromagnetic coils that produce electricity from a rotation of turbine blades having magnets.

The double-regulated turbine comprises a spherical hub, adapted to rotate around a first rotation axis, and blades, which are each able to be swivelled relative to the hub around a second rotation axis, transversal to the first rotation axis, by respective coupling flanges that are mounted fixedly on the spherical hub and that include each an attachment surface for a corresponding blade. The attachment surface of the coupling flanges includes a flat portion.

A movable-blade operation system for a hydraulic machine according to an embodiment includes an oil hydraulic cylinder installed within a rotational shaft, a bidirectional pump, a pump drive motor, a control unit, and an oil head installed in the hydraulic machine. The bidirectional pump selectively feeds pressurized hydraulic oil to one of a first cylinder chamber and a second cylinder chamber. The oil head couples the rotational shaft rotatably, and the hydraulic oil fed from the bidirectional pump to the first cylinder chamber and the second cylinder chamber flows through the oil head. The bidirectional pump, the pump drive motor, and the control unit are installed outside the hydraulic machine.

A power generation plant including a turbine (1) of a Kaplan, bulb, diagonal flow or propeller turbine type, a water intake (4) and a water run-off (5). Additional vanes vane (8) are deployable into a water passage formed between the water intake (4) and the housing of the turbine. Eddy flows formed in the water intake (4) are reduced by the additional vanes. The vanes allow the turbine operating range to be extended to cover smaller outputs.

The present invention discloses a ducted bidirectional tidal current power station system, mainly consisting of a bidirectional tidal current power generation device, a dam, an open sea, an inland sea, a duct, and an opening/closing gate. The bidirectional tidal current power generation device is installed in the duct on the bottom of the dam. Openings, respectively communicated with the open sea and the inland sea, are formed at two ends of the duct, and an opening/closing gate is arranged at each of the two openings. By the ducted bidirectional tidal current power station system of the present invention, the cost of marine construction, operation and maintenance of the tidal current power generation device in an open sea area is saved, and the complex structure of the power generation device in the tidal power station and the cost of strict construction of auxiliary devices and runners are avoided.

An ocean energy power generation water leak-proof device includes a water storage tank and a water pump. Water leaking into the ocean energy power generation device from the external is accumulated by the water storage tank, and is pumped by the water pump to the external of the ocean energy power generation device. An ocean energy power generation device includes a generator 1, at least one horizontal-axis hydro turbine, a sealed cabin, a sealing ring and at least one water leak-proof device. The hydro turbine is effectively prevented from damage caused by water leaking into the interior of the horizontal-axis hydro turbine.

Some embodiments include a mounting system for mounting the device in a fluid, an axle fixed to the mounting system, a solid walled hollow body that rotates about the axle having axial symmetry about a longitudinal axis. The solid walled hollow body may be substantially rounded at the front, expanding to a maximum diameter less than half the distance from the front end to the back end, and tapering radially along the longitudinal axis to the back end. The energy device may further comprise a plurality of blades on the exterior of the hollow body, each blade extending from the front end of the solid walled hollow body to the back end, rising to a maximum height, and having concave and convex walls.

The present invention discloses a ducted bidirectional tidal current power station system, mainly consisting of a bidirectional tidal current power generation device, a dam, an open sea, an inland sea, a duct, and an opening/closing gate. The bidirectional tidal current power generation device is installed in the duct on the bottom of the dam. Openings, respectively communicated with the open sea and the inland sea, are formed at two ends of the duct, and an opening/closing gate is arranged at each of the two openings. By the ducted bidirectional tidal current power station system of the present invention, the cost of marine construction, operation and maintenance of the tidal current power generation device in an open sea area is saved, and the complex structure of the power generation device in the tidal power station and the cost of strict construction of auxiliary devices and runners are avoided.

A power generation plant including a turbine (1) of a Kaplan, bulb, diagonal flow or propeller turbine type, a water intake (4) and a water run-off (5). Additional vanes vane (8) are deployable into a water passage formed between the water intake (4) and the housing of the turbine. Eddy flows formed in the water intake (4) are reduced by the additional vanes. The vanes allow the turbine operating range to be extended to cover smaller outputs.