A multiple-action radial piston pump scheme with a revolving outer ring featuring low speed and high volumetric efficiency is proposed to solve the problem of rotating speeds mismatch between the seawater hydraulic pump and the hydro-turbine in the reverse osmosis desalination system driven by tidal current energy. The pump is composed of a moving shell
a cylinder
a distributing valve
a plunger component
a liquid spring
a pipeline shaft
and a pressure regulator
etc. When the pump is working
the tidal current energy hydro-turbine drives the shell directly and the multi-row misaligned axisymmetric plunger component is closely attached to the inner wall of the shell under the action of the liquid spring
moves reciprocally along the multi-action curve of the inner wall relative to the cylinder hole
and completes seawater suction and compression through the distribution valve. The pump reali-es multiple actions within single rotation to raise the frequency and velocity of the pist
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