Fluidic repeater

Motors: expansible chamber type – Working member position feedback to motive fluid control – Fluid operated

Patent

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Details

91 51, 91402, 91461, 13762562, F15B 1316, F15B 1522

Patent

active

041378253

ABSTRACT:
Two fluid passages are connected through flow restrictors to a fluid supply. Downstream of the restrictors the fluid supply has a drooping pressure-load characteristic. Venting means for the fluid passages comprises vent openings therein downstream of the restrictors and variable position obstructor means cooperating with vent openings to vary the venting and thereby vary fluid pressures in the fluid passages.
Fluid conduits connect these pressure outputs to a piston moving in a cylinder whose opposite ends are connected to the fluid conduits. The piston and cylinder form the responder of the system. A feed back means controlled by the position of the responder piston and/or the load varies pressure in the fluid conduits by variably venting same.
The feedback means includes variable cross-section surface pasages, e.g. sloping grooves, in the responder piston or fluidic load piston or both. Alternatively or additionally a separate feedback piston may be connected to the receiver or load piston. The feedback vent-position function must be properly correlated to produce negative pressure feedback with respect to the obstructor means vent-position function to obtain a receiver piston motion directly proportional to transmitter obstructor motion.
Instead of variable venting, variable pressures can be generated by making the restrictors variable and conducting the downstream pressure by two lines to the responder. Furthermore, the transmitter may be modified to effect change in only one pressure. A single line may then be used between transmitter and responder.

REFERENCES:
patent: 2709421 (1955-05-01), Avery
patent: 2836154 (1958-05-01), Lantz
patent: 2841168 (1958-07-01), Levitus et al.
patent: 2974639 (1961-03-01), O'Connor et al.
patent: 3040715 (1962-06-01), McCombs et al.
patent: 3076442 (1963-02-01), Raeber
patent: 3215044 (1965-11-01), Lissou
patent: 3415163 (1968-12-01), Inaba et al.
patent: 3543648 (1970-12-01), Stahle
patent: 3548876 (1970-12-01), Viersma et al.
patent: 3777784 (1973-12-01), Nicholson

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