The invention belongs to the technical field of ocean energy utilization, and particularly relates to an ocean energy utilization device which comprises a sealed cabin, a sleeve shell and an oscillating floater. The oscillating floater is driven by
sea waves to move up and down, and the sleeve shell rigidly connected with the oscillating floater and the
middle column penetrating through the sealed cabin are driven to synchronously reciprocate; the upper section of the
middle column directly drives the linear generator to generate power to complete
core energy conversion; when the
piston head moves upwards, cold
seawater is sucked in through a filter plug at the
tail end of the water inlet
pipe, and at the moment, a one-way valve I is opened; when the
piston head is pressed downwards, the first one-way valve is closed,
seawater is pressurized, pumped into the flow guide grooves in the two sides of the interior of the sealed cabin and ascends along the grooves to flow through the cabin wall of the linear generator to be actively cooled, and the
seawater absorbing heat jacks open the second one-way valve and is discharged from the water outlet
pipe. Part of discharged
water flow is evenly sprayed on the outer wall of the sealed cabin through a collector ring on the inner side of the supporting bridge, and the cleaning effect of the first scraping ring and the second scraping ring fixed to the sleeve shell in the follow-up scraping process is enhanced.