Underwater hydraulic system for reducing pump noise

Power plants – Pressure fluid source and motor

Patent

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60415, 60459, 91 4R, 114315, 440 5, F16D 3100, F15B 2104, B63C 1146

Patent

active

054170630

ABSTRACT:
A hydraulic system which includes a pump for supplying hydraulic fluid to a load and receiving hydraulic fluid therefrom wherein the pump is acoustically isolated from the surrounding water medium. The pump and a motor which drives the pump is enclosed in a pressure vessel, the interior of which is supplied with a gas at a certain pressure less than the ambient water pressure. The pressure of the hydraulic fluid in the return line is maintained at a pressure less than the ambient by a reservoir arrangement which includes a piston and rod assembly with the rod being subject to the ambient water medium. A certain pressure within an oil filled compartment of the reservoir is maintained at a fraction of the ambient water medium pressure by making the ratio of the cross sectional area of the piston to the rod equal to that predetermined fraction. This reduced pressure compartment is hydraulically connected to the fluid return line as well as to a gas regulator.

REFERENCES:
patent: 3100965 (1963-08-01), Blackburn
patent: 3161028 (1964-12-01), Odum et al.
patent: 3469555 (1969-09-01), Greiner
patent: 3643449 (1972-02-01), Murphy
patent: 4539814 (1985-09-01), McKie

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