Motors: expansible chamber type – Working member position feedback to motive fluid control – Fluid operated
Patent
1974-07-18
1976-11-02
Maslousky, Paul E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Fluid operated
91 51, 91461, 13762563, F15B 1316
Patent
active
039889661
ABSTRACT:
Two fluid passages are connected through flow restrictors to a fluid supply. Downstream of the restrictors the fluid supply has a drooping pressureload 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. This forms a mechanical to fluidic translator. Pressures at the translator's outputs are a function of the obstructor's position. This translator forms the transmitter of a servo or remote control or indicator system.
Fluid conduits connect these pressure outputs to a fluid to mechanical translator comprising a double acting piston moving in a cylinder whose opposite ends are connected to the fluid conduits. The piston and cylinder form the responder of the system, which may be adjacent the mechanical to fluidic translator and form part of the transmitter. A receiver is formed by a piston and cylinder or other fluidic motor remotely fluidically connected to the responder, the motor driving a load. Alternatively the remote motor may be omitted, the responder itself constituting a receiver and driving directly a load connected by a mechanical linkage to the responder. The responder may be remote from the translator and form part of the receiver. 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 degree of feed back venting is a function of piston position. The responder may serve as an amplifier and its piston connected, mechanically or fluidically, to an output display or load for indication or proportional control.
The feedback means includes variable cross-section surface passages, 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 venting means is preferably of the spool or other gate valve or needle valve type to provide a linear pressure change in response to position, however, a typically non-linear flapper and jet arrangement may also be used. 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: 2841168 (1958-07-01), Levefus et al.
patent: 2989950 (1961-06-01), Lockman
patent: 3040715 (1962-06-01), McCombs et al.
patent: 3215044 (1965-11-01), Lissau
patent: 3415163 (1968-12-01), Inoba et al.
patent: 3486416 (1968-12-01), Eastman
patent: 3583285 (1971-06-01), Johnson
patent: 3665806 (1972-05-01), Heath
Maslousky Paul E.
Robinson Murray
LandOfFree
Fluidic repeater does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluidic repeater, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluidic repeater will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1152455