Compact electrohydraulic drive for valves of turbomachines, espe

Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy

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Details

60416, 60418, 91459, 91461, 417310, F16D 3102

Patent

active

046272356

ABSTRACT:
An electrohydraulic compact drive for turbomachine valves includes: a device for supplying electric power, receiving electrical addressing signals and converting the signals into positioning and control variables; an hydraulic supply system including a fluid tank, pump, motor, accumulator and manifold; an hydraulic power piston/cylinder system including a piston rod connected to a valve, and a spring biasing the piston; an electrohydraulic addressing system generating a pressurized fluid flow opening the valve spindle against the spring dependent upon the variables; control members of the addressing system, the power system and the supply system forming a compact drive block at a valve; the pump being switched as a function of a pressure limit by intermittent charging and discharging operations between the charging pressures; the pump charging the accumulator in charging operation until the upper pressure is reached and, after being switched, returning the fluid to the tank in substantially pressureless circulating operation until the lower pressure is reached and being switched to the charging operation depending on the pressure limit; and the usable accumulator volume and the lower charging pressure being sufficiently high for extreme control processes so that: ##EQU1## AV being the work capacity of the accumulator, P.sub.min the minimum operating pressure of the supply system,

REFERENCES:
patent: 3906726 (1975-09-01), Jameson
patent: 4065094 (1977-12-01), Adams
patent: 4142368 (1979-03-01), Mantegani
patent: 4475710 (1984-10-01), Leupers

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