Provided is an underwater floating-type ocean current power generation device whereby cyclical directional vibration of a floating body of the ocean current power generation device, caused by shadow moment, can be suppressed. An underwater floating type ocean current power generation device includes ocean current power generation device main bodies, each including a rotor of a power generator housed in a nacelle, and a structure. The rotor is configured to be driven by a rotary blade protruding outward from the nacelle. A twin drum floating body capable of floating underwater is constituted by the structure and the ocean current power generation device main bodies joined to the left and right of the structure. The underwater floating type ocean current power generation device is moored to an ocean floor by a mooring rope.

A hydroelectric power generating apparatus includes a check dam mounted on a hilltop portion of a hillside to accumulate water of a river reach, a power generating device mounted on a hill bottom portion of the hillside to be driven by a kinetic energy carried by the water for power generation, a diversion pipe extending from the check dam to the power generating device and having at least one diversion duct which extends along the river reach to make a pipeline that converts gravitational potential energy of the water into the kinetic energy, and a surge tank disposed to stand uprightly from the diversion duct for balancing pressure in the diversion duct.

There is provided a turbine including a hub body including a shaft for transmitting the torque generated by the turbine to a driven machine, a plurality of turbine blades carried by the hub body and rotatable about their longitudinal axes, an adjusting body in an interior of the hub body, arranged as a spherical link chain extending coaxially to the shaft and rotatable about a shaft axis of the shaft, and a guide rod chain for each of the plurality of turbine blades, including a smooth spherical shell having a uniform surface and two guide rods, including a first guide rod having a first end linked to the adjusting body via a swivel joint and a second guide rod having a first end linked to a second end of the first guide rod via the swivel joint.

A hydropower generator includes: a driving shaft installed along a path through which a fluid flows; a plurality of blade assemblies installed along a lengthwise direction of the driving shaft; a spinning supporter connected to rotatably support the driving shaft; a power generator receiving a spinning force of the driving shaft and generating electricity; and a flow pipeline internally provided with the driving shaft along a lengthwise direction thereof and formed with a channel through which a fluid flows.

A water mill, power generator, for use underwater, has a flexible support shaft which permits the water current to orient the turbine axis substantially parallel to the direction of flow so that the force of the water on the blades is optimized for a given turbine, without the need for slip ring style connections between the generator at the turbine and the 5 anchored base. Optionally, the design features fins or cowlings on the flexible support shaft to further improve reorientation of the turbine with the water current or flow acting as the source of power; and/or output power links or power conditioning systems at the anchored base. The generators may be selected to meet low rotation operating conditions, and the entire system may be designed for particular ocean bottom and/or current parameters applicable to the 10 deployment.

A self-propelled, robotic power generating system remains submerged in deep water areas, tethered within steady-state, generally unidirectional sea currents in non-tidal areas for the continuous production of turbine-generated electricity that is transmittable by multipurpose undersea power cable to onshore electric grids. System aspects include a shore-to-system communication means to remotely manage all system functions; a sea current intake consisting of a cone-like, retractable current amplifier to significantly increase the energy density of the currents passing through the amplifier to the turbine; a self propulsion means to move the system to maintain a desirable location within a prescribed area that may be subject to meandering currents; a snorkel-like vertical air conduit for ballast control; a seawater pumping means for ballast control; a retractable marine wildlife protector to cover the sea current intake; and a remotely retractable anchor means to maintain the generating system in a target position for extended time periods.

An underwater structure includes a power generation unit, which includes a main body, a mounting portion which extends from the main body and which defines a mounting axis, and a support structure adapted for engagement with a bed of a body of water, and support housing. The mounting portion defines a substantially continuous mounting surface which extends substantially completely around the mounting portion, and the support housing defines a substantially continuous support surface which extends substantially completely around the support housing. The mounting surface and support surface are arranged to abut one another substantially continuously when the power generation unit is mounted on the support structure. The mounting portion and the support housing are adapted to cooperate with one another for mounting of the power generation unit on the support structure in any polar orientation about the mounting axis.

An assembly for generating electrical power from a fluid flow being installable to a fluidic conduit comprising a fluid, the assembly comprising a turbine for generating power from the fluid flow, the turbine provided within a turbine body, a connecting member having a proximal portion attached to a distal portion of the turbine body and a distal portion comprising a cap, a separate enclosure for housing the turbine and turbine body, the enclosure slidably receiving the connecting member through a distal portion, the cap of the connecting member being securable to the enclosure. The enclosure is connectable to a valve member, the valve member and the enclosure for provision external to the fluidic conduit comprising the fluid.

An accelerated and/or redirected flow arrangement, optimally serving as a wildlife and/or debris excluder (WDE), is used in combination with a turbine-like device having an inlet end and an outlet end for fluid flowing therethrough, e.g., a hydro-turbine. The arrangement includes at least a forward part designed to be placed in front of a fluid inlet of a turbine-like device and configured to produce at least one of the following effects on the fluid: (a) imparting a re-direction of the fluid; and/or (b) accelerating the flow velocity of the fluid, as it flows through the forward part. Turbine-like devices having both a forward part and a rearward part of flow arrangement are disclosed, as well as a method of enhancing turbine performance.

A rotor shaft unit for a tidal system, which tidal system includes a main frame and a rotor and a housing connected to the rotor, includes a rotor shaft configured to be connected to the main frame, at least one bearing unit for rotatably supporting the housing for rotation relative to the rotor shaft, and a sleeve configured to be mounted in the main frame, the sleeve being disposed around a first end portion of the rotor shaft and connected to the rotor shaft by a friction connection. Also a tidal system including the rotor shaft unit.