| Submersible with deep-depth is an important implement to exploit ocean source.Buoyancy regulating system is an important part of submersible, in which super-pressureseawater pump is core equipment. Oil-water separated structure is mainly used in existinghigh pressure seawater pump, which has low efficiency and is harmful to the environmentdue to leakage oil. Structure design and efficiency analysis of a novel super-pressureseawater pump with water lubrication are made in this paper. This paper mainly includes thefollowing aspects:（1）The pivotal parts of the structure in the novel super-pressure seawater pump suchas stepped piston-barrel pair, thrust bearing and flat valve are designed in this paper. Thematerial used in friction pair in this pump is selected. Friction coefficient of the material isachieved by friction and wear experiment, which is used in the mechanical efficiencyanalysis.（2）The source of mechanical efficiency loss is deduced. The loss caused bybearing-shaft pair, slipper-swash plate pair and piston-barrel pair is analyzed. Geneticalgorithm is used to optimize structure parameters. Each part takes different proportion ofentire mechanical efficiency loss.（3）The source of volumetric efficiency loss is deduced. The loss caused bypiston-barrel pair, flat valve and dead volume is analyzed. The design parameters areoptimized to improve the seawater pump volumetric efficiency.According to the results of optimization, the rated pressure of novel super-pressureseawater pump with water lubrication is80MPa, the rated flow is8L/min. The results showthat the mechanical efficiency is90.97%, the volumetric efficiency is93.81%，and the totalefficiency is85.34%.Theoretical analysis in this paper provides a method for efficiencyassessment of pump. Theoretical basis is provided for prototype machining in this paper. |
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