A WEC module for connection to a WEC system having a power take-off (PTO) configured to generate electricity in response to fluid flow in a fluid flow path of the system. The module includes a mounting portion for releasably mounting the module to the system, a deformable sealing member configured to provide a sealed fluid connection between the module and the fluid flow path, and a working surface configured to exchange, in response to wave motion, a working fluid with the fluid flow path via the sealed fluid connection. Also disclosed is a WEC system and a method of deploying the WEC module. Also disclosed is an installation device for a working surface and a method of installing a working surface.

A method for driving a transmission mechanism output power in response to an anticipated fluid-pressure gradient field is provided. The method includes sensing the change of direction of pressure gradient field at a desired location from the different area of the transmission mechanism within fluid. The method further includes constructing fluid-pressure gradient field based upon isolation-fluid apparatus or low-density fluid space installed on a transmission mechanism within fluid.

A turbine unit for a hydraulic installation, and more in particular it deals with the hub of the turbine unit. The present invention proposes to provide means for adjusting a gap extent formed between the hub and the inner edge of the blade, this way dramatically increasing the performance of the turbine.

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.

This invention provides a rolling bearing protection device and a vertical-axis tidal current energy generating device applying the same. The vertical-axis tidal current energy generating device includes a frame, a vertical-axis hydraulic generator, a rolling bearing, and a rolling bearing protection device. The vertical-axis hydraulic generator includes a main shaft disposed vertical to a horizontal surface, one end of the main shaft is rotatably disposed at a bottom of the frame. The rolling bearing is sleeved on one end of the main shaft. The rolling bearing protection device is disposed above the rolling bearing. The rolling bearing protection device includes a first sealing protection device, a first water leak-proof chamber, and a second sealing protection device disposed in sequence along a gravity direction.

The disclosure provides a sealing system applicable for an ocean power generation device, which includes at least one first seal and a water leakage protection device. The water leakage protection device is located at a side of at least one first seal away from seawater, and includes a sealed water storage tank and a drain pipe. The sealed water storage tank collects and stores seawater leaked from the at least one first seal. One end of the drain pipe is communicated with the sealed water storage tank, and the seawater stored in the sealed water storage tank is discharged through the drain pipe.

There is provided a seal assembly comprising: a first component and a second component spaced apart from the first component so as to define a passage for the transfer of fluid from an inlet of the seal assembly to an outlet of the seal assembly, wherein the first component comprises a concavity at least partially defining the passage, and wherein no part of the second component extends into the portion of the passage bounded by the concavity.

This invention aims to provide the composition of inlet so that the strong output may be provided by rotating with the state of high efficiency as the water falling energy and the flow pressure are simultaneously provided to the impeller and to provide impeller assembly for hydroelectric power generation device maximizing the output efficiency by improving the composition of impeller positively. Namely, this invention inserts the impeller in the main body of cylinder shape that the closed inner space is formed by the cover member, the driving shaft shall be supported in the bearing coupled to the cover member, the impeller installed in the inner space shall be driven by forming the inlet and the outlet in the main body in the impeller assembly for a hydroelectric power generation device; the abovementioned inlet, the fluid like the involute curve shall be supplied from the 12 o'clock direction to the 4 o'clock direction of the main body, the outlet is formed from 6 o'clock direction to 8 o'clock direction, the abovementioned impeller forms the plural fluid tanks opened toward the inner surface of the main body, the moment of rotation of the impeller shall be increased by forming the abovementioned fluid tank in the closed pressuring part is formed in the direction of 4 o'clock direction to 6 o'clock direction.

A method for driving a transmission mechanism output power in response to an anticipated fluid-pressure gradient field is provided. The method includes sensing the change of direction of pressure gradient field at a desired location from the different area of the transmission mechanism within fluid. The method further includes constructing fluid-pressure gradient field based upon isolation-fluid apparatus or low-density fluid space installed on a transmission mechanism within fluid.

This invention provides a rolling bearing protection device and a vertical-axis tidal current energy generating device applying the same. The vertical-axis tidal current energy generating device includes a frame, a vertical-axis hydraulic generator, a rolling bearing, and a rolling bearing protection device. The vertical-axis hydraulic generator includes a main shaft disposed vertical to a horizontal surface, one end of the main shaft is rotatably disposed at a bottom of the frame. The rolling bearing is sleeved on one end of the main shaft. The rolling bearing protection device is disposed above the rolling bearing. The rolling bearing protection device includes a first sealing protection device, a first water leak-proof chamber, and a second sealing protection device disposed in sequence along a gravity direction.