US 4,258,753 AGranted

Fluidic switch

AssigneeAvco Everett Research Laboratory, Inc.

InventorRudolf Limpaecher

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Abstract

A fluidic amplifier or switch for supplying pulses of a power gas to be controlled which is insensitive to load impedance or back pressure. One arm of the fluidic switch comprising part of the gas injection path is coupled to a working outlet and the other arm is coupled through a sonic orifice to a vent outlet. An orifice is provided in the downstream end of the power gas injection path, the injection pressure is maintained at preferably at least about twice the maximum back pressure and a substitute gas is injected into the arm of the fluidic switch not carrying the power gas to be controlled. The two gases are each alternately supplied to the working outlet and the vent outlet. When the power gas to be controlled is supplied to the working outlet, the substitute gas is supplied to the vent outlet and when the substitute gas is supplied to the working outlet, the power gas to be controlled is supplied to the vent outlet to maintain the pressure constant across the working outlet orifice.

A fluidic switch comprising:

(a) a first interaction chamber;
(b) first means for issuing a first deflectable continuous jet of fluid to be controlled under pressure through said first interaction chamber;
(c) first and second reception channels having entrances from said first interaction chamber and located to receive said first continuous jet selectively according to the direction of flow of said first continuous jet;
(d) first and second control means disposed in opposed relationship adapted to controllably issue streams of fluid impacting against said first continuous jet to deflect said first continuous jet to selectably flow into one or the other of said first and second reception channels;
(e) first and second orifices for receiving fluid flow from respectively said first and second reception channels;
(f) a second interaction chamber;
(g) second means for issuing a second deflectable continuous jet of substitute fluid under pressure through said second interaction chamber;
(h) third and fourth reception channels having entrances from said second interaction chamber and located to receive said second continuous jet selectably according to the direction of flow of said second continuous jet, the exit of said third reception channel being coupled to said first reception channel and the exit of said fourth reception channel being coupled to said second reception channel;
and
(i) flow control means effective to deflect said second continuous jet of substitute fluid in such direction that said second continuous jet of substitute fluid flows into said third reception channel when said first continuous jet of fluid flows into said second reception channel, and said second continuous jet of substitute fluid flows into said fourth reception channel when said first continuous jet of fluid flows into said first reception channel, whereby when said second jet of substitute fluid flows substantially only through one of said orifices, said first jet of fluid flows substantially only through the other of said orifices.

7 more elements

Facts

Application

06/040,195Filed 18 May 1979

Granted

31 Mar 1981

Term ends

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Classification8 codes

F15C 1/10
Boundary-layer devices, e.g. wall-attachment amplifiers coanda effect: for digital operation, e.g. to form a logical flip-flop, OR-gate, NOR-gate…
Y10T 137/2076
Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]: utilizing diverse fluids
Y10T 137/2125
System comprising plural fluidic devices or stages: plural power inputs [e.g., parallel inputs]
Y10T 137/2142
Plural power inputs [e.g., parallel inputs]: with variable or selectable source of control-input signal

Abstract

Claims6