| 摘要 |
<p>1,105,541. Fluid-pressure servomotor systems; regulating fluid-flow. SANDERS ASSOCIATES Inc. March 9, 1965 [March 16, 19641, No.9987/65. Headings G3H and G3P. A hydraulic servovalve system comprises a flapper 11a which is moved by an electric torque motor 10 to control the flow from jets 12, 13 whereby a pressure difference may be produced to act on a valve 21 controlling the supply and exhaust to a motor 27, which may actuate a ships rudder. The conduits 22, 23 connected to the opposite ends of the motor are connected by lines 42, 43 to the bore of valve 21 which has a groove 30 which, when the valve 21 is actuated, connects a conduit 28 to the low pressure conduit 22 or 23. The conduit 28 leads from the chamber of the flapper valve and has a connection through a restrictor 38 to a drain conduit 36 whereby when the flapper 11a is in its null position the leakage from the chamber is kept to a minimum. When the spool has moved from its null position, the pressure in conduit 22 or 23 connected to the pilot return is indicative of the load on the motor 27 and this pressure, acting in the flapper chamber modifies the pressure differential acting on the spool. Restrictors 60, 61 in the conduits 8, 9 control the frequency response. The specification describes a laminar flow restrictor in which a piston successively opens flow ports which are graduate in size. In a modification, the flow ports of the restrictor are of the same size with graduated fluted inserts to vary the flow area.</p> |
