US3428065A - Feedback isolator - Google Patents

Feedback isolator Download PDF

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Publication number
US3428065A
US3428065A US3428065DA US3428065A US 3428065 A US3428065 A US 3428065A US 3428065D A US3428065D A US 3428065DA US 3428065 A US3428065 A US 3428065A
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Prior art keywords
stream
collector
fluid
nozzle
passage
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Expired - Lifetime
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English (en)
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Terence J Cawley
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Corning Glass Works
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Corning Glass Works
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
    • F15C1/00—Circuit elements having no moving parts
    • F15C1/02—Details, e.g. special constructional devices for circuits with fluid elements, such as resistances, capacitive circuit elements; devices preventing reaction coupling in composite elements ; Switch boards; Programme devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/206—Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
    • Y10T137/2229—Device including passages having V over T configuration
    • Y10T137/2234—And feedback passage[s] or path[s]

Definitions

  • a fluid feedback isolator in a fluid passage having an emitter nozzle upstream of a constant pressure chamber and a collector downstream thereof is disclosed.
  • the collector is disposed in a spaced, longitudinally aligned, stream intercepting relationship with said emitter, with the emitter nozzle and collector having a cross section substantially smaller than the passage within which they are located.
  • This invention relates to fluid operated systems and more particularly to a device for isolating or nullifying the effect of downstream disturbances or feedback in a fluid operated system, but is not limited to such applications.
  • a fluid stream hereinafter referred to as the power stream, issues from a nozzle or orifice constructed such that the power stream is well defined in space.
  • a control stream is directed toward the power stream in a direction generally perpendicular thereto to provide a differential pressure or pressure gradient across the power stream.
  • the apparatus is provided with at least two outlets or fluid recovery apertures or passages facing the power stream, which recovery apertures or passages are arranged such that when the power stream is undefiected by the control stream, all of the fluid of the power stream is directed to one of the outlet passages.
  • Deflection of the power stream by the control stream results in delivery of at least a portion of the power stream to the second outlet passage where some of the kinetic energy of the power stream entering the second outlet passage may be recovered, or where the fluid so directed may be delivered to a utilization device.
  • a low energy control stream can deflect a well defined high energy power stream to the extent required to cause a substantial portion of the power stream to be delivered to the second outlet passage, while the integrity or the well defined character of the power stream is retained sufliciently a-fter interaction of the two streams so that the total energy or change in total energy delivered to the second outlet passage can be greater than the energy or change in energy required to accomplish this deflection.
  • the apparatus is capable of amplification and can produce a power gain.
  • This of course is but one fluid amplifier system, and the gain achieveable with a particular system will vary and be to a degree dependent upon the spacing between the outlet passages and the nozzle from which the power stream issues.
  • Another object of this invention is to provide a means [for producing a well defined high energy fluid stream totally independent of downstream flow resistance or pressure changes, and totally independent of any feedback from any downstream source.
  • a further object is to obtain optimum design parameters from fluid amplifier circuitry.
  • a feedback isolator having an emitter means for issuing a stream of fluid under pressure, a collector positioned in an intercepting relationship to said stream, and a constant pressure chamber intermediate said emitter means and said collector with said stream passing through said chamber so that its integrity is retained and a substantial portion thereof is delivered to said collector.
  • FIGURE 1 is a fragmentary plan view of a fluid operated device embodying the feedback isolator of this invention.
  • FIGURE 2 is a cross sectional elevation of the device of FIGURE 1 taken along line 2-2 thereof.
  • FIGURE 3 is a cross sectional elevation of the device of FIGURE 1 taken along line 33 thereof.
  • FIGURE 4 is a fragmentary plan view of a fluid operated device illustrating another embodiment of the feedback isolator of this invention.
  • FIGURE 5 is a plan view of a bistable fluid amplifier embodying the feedback isolator of this invention in two outlet apertures thereof.
  • the present invention may be utilized with many multistable fluid amplifiers, or other fluid operated devices wherein a high energy fluid stream passes through a passage or aperture.
  • the stream fluid may be compressible such as air, nitrogen, or other gases, or incompressible such as water or other liquids. This invention is not limited to any particular fluid.
  • a fluid operated device 10 comprising plates 12 and 14 and having fluid stream passages or apertures 16 and 18 formed in plate 12.
  • Feedback isolator emitter nozzle 20 is formed terminating aperture 16.
  • a collector 22 is formed, which collector is connected to aperture 18.
  • a constant pressure chamber 24, comprising channel 26 and openings 28 and 30, is formed intermediate emitter nozzle 20 and collector 22 thereby separating them.
  • Channel 26 and openings 28 and 30 are formed in plate 12 and extend through plate 14 to the exterior of device .10. The pressure in chamber 24 is maintained constant since it is open to ambient.
  • passage 18 is a continuation of passage 16 downstream of the feedback isolator.
  • Plates 12 and 14 may be formed of any suitable material such as metal, glass, ceramic, plastics or the like, and are sealed or bonded together by any suitable method well known to one familiar with the art.
  • a well defined high energy power stream flows through aperture 16, in the direction indicated by the arrows in FIGURE 1, it enters emitter 20. Being a well defined and high energy stream, it passes through channel 26 of chamber 24 and it is intercepted by or enters collector 22 sufficiently retaining its well defined character so that it can pass through aperture 18 and deliver sufficient energy necessary at the point of utilization, not shown. Any change of flow resistance or pressure downstream of chamber 24, such as by the functioning of a utilization device, leaks, or resulting from any cause whatever, or any low energy feedback through aperture 18, will have no affect on the quality or characteristics of the stream in aperture 16, since any such change or feedback will be dissipated in chamber 24. Suitable utilization devices are timers, digital logic circuit elements, analog circuit elements, or the like.
  • Collector 32 is formed with a funnel-like section opposing emitter nozzle 20, which funnel-like section aids in maintaining a well defined power stream and also aids in dissipating any feedback.
  • FIGURE 5 illustrates a bistable fluid amplifier device 34, having feedback isolators of this invention formed in each of the outlet apertures thereof.
  • a bistable fluid amplifier device 34 having feedback isolators of this invention formed in each of the outlet apertures thereof.
  • Such a device may also be formed of two plates such as that described in connection with the devices of FIGURES l-3, however, for the purposes of clarity the upper plate 36 is shown as being transparent.
  • a pair of outlet passages 42 and 44 are formed at the outlet of nozzle 40.
  • outlet passages 42 and 44 that is the left wall of passages 42 and the right wall of passage 44, are set back from nozzle 40 so that, in accordance with Bernoullis Theorem, the high energy power stream issuing from nozzle 40 can create a region of low pressure adjacent either of these walls causing the stream to lock-on to such wall. Such a condition is maintained as long as fluid is supplied to aperture 38 and nothing disturbs the power stream.
  • Two control signal input apertures 46 and 48 are provided for control purposes. If the power stream is lockedon the left wall of passage 42 and a pressure is applied to aperture 46, a control stream will issue from control nozzle 50 causing it to impinge on the power stream, displacing the power stream and causing it to lock-on to the right wall of passage 44. The opposite is also true. When the power stream is locked-n to the right wall of passage 44, and a pressure is applied to aperture 48, a control stream will issue from control nozzle 52 displacing the power stream again, causing it to lock-on to the left wall of passage 42.
  • a common constant pressure chamber 54 is formed across and intermediate the ends of both outlet passages 42 and 44.
  • Chamber 54 comprises channels 56 and 58, and openings 60, 62, and 64.
  • As the high energy power stream flows through passage 42 it passes through emitter nozzle 66, channel 56 and enters collector 68, from which it flows through passage 70, which passage 70 is obviously that portion of outlet passage 42 that is downstream of collector 68, to a point of utilization.
  • a typical example of a feedback isolator embodied within a fluid amplifier such as that illustrated in FIG- URE is as follows.
  • the emitter nozzle and collector have a width of 0.030 inch and a height the same as the power stream nozzle of 0.040 inch.
  • the constant pressure chamber has a width, that is the spacing between the emitter nozzle and collector, of 0.020 inch and a length of 0.090 inch.
  • the chamber openings are 0.080 inch in diameter.
  • a power stream having a pressure of 2 p.s.i. upstream of a feedback isolator having the above dimensions has been found to emerge from the isolator having a pressure of approximately 1.9 p.s.i.
  • the preferred emitter nozzle and collector widths are from approximately W to approximately lOW while maintaining the same height. Further, it has been found that the preferred width of the constant pressure chamber is at least 2W. Neither the length of the chamber channel nor the size of the chamber openings are critical.
  • any specific feedback isolator will at least in part depend on the fluid density, temperature, and pressure, as well as the characteristics required of the power stream at the point of utilization. It must be noted that for proper operation, the width of the constant pressure chamber channel must :be of such size that the well defined high energy stream can pass through it, while downstream disturbances, or changes are dissipated by it.
  • a feedback isolator comprising means for issuing a stream of fluid under pressure
  • a collector for receiving said stream having a cross section of substantially the same size as that of said means positioned in a stream intercepting relationship with said means, and an elongated chamber intermediate said means and said collector opened to ambient atmosphere along its length including that portion which separates said collector from said means, said stream being passable through said chamber.
  • a feedback isolator for a fluidic system comprising means for issuing a well defined high energy fluid stream disposed within a fluid passage,
  • a collector for receiving said stream disposed within said passage in a spaced, stream intercepting relationship and in longitudinal alignment with said means, said means and said collector having a cross section substantially smaller than that of said passage, and
  • an elongated chamber intermediate said means and said collector opened to ambient atmosphere along its length including that portion which separates said collector from said means, said stream being passable through said chamber.
  • Adevice comprising a fluid amplifier of the type having interconnected fluid passages whereby a well defined high energy fluid stream may flow from an inlet nozzle to any one of a plurality of outlet passages,
  • nozzle means substantially smaller in width than said outlet passages for channeling said well defined high energy fluid stream through such outlet passages disposed intermediate the ends of at least one of said plurality of outlet passages,
  • collector in a spaced, longitudinally aligned, stream intercepting relationship with each of said means, for receiving said stream, said collector having a cross section substantially smaller than that of said passages, and
  • a device comprising a fluid amplifier of the type having interconnected fluid passages whereby a well defined high energy fluid stream may flow from an inlet nozzle having a width W to any one of a plurality of outlet passages,
  • a feedback isolator for a fluidic system comprising 10 a collector for receiving said stream having a width an emitter nozzle for issuing a well defined high enranging from approximately W to approximately ergy stream disposed within a fluid passage, 10W disposed in a spaced, longitudinally aligned, a collector disposed within said passage in a spaced, stream intercepting relationship with said emitter longitudinally aligned, stream intercepting relationnozzle, and ship with said nozzle for receiving said stream, said an elongated chamber intermediate said emitter nozzle collector having a funnel like portion facing said and said collector opened to ambient atmosphere nozzle, said nozzle and said collector having a cross along its length including that portion which sepsection substantially smaller than that of said pasarates said collector from said emitter nozzle, said sage, and stream being passable through said chamber.
  • an elongated chamber intermediate said emitter nozzle 15. The device of claim 14 wherein the width of said and said collector opened to ambient atmosphere along its length including that portion which separates said collector from said emitter
  • a feedback isolator for a fluidic system comprising means for issuing a well defined high energy fluid 9.
  • a fluid operated system comprising stream disposed within a fluid passage,
  • a fluid amplifier of the type having interconnected fluid a collector within said passage for receiving said stream passages whereby a well defined, high energy fluid having a cross section of substantially the same size stream may flow from an inlet nozzle to at least as that of said means, said collector being disposed one of a plurality of outlet passages, in a spaced, stream intercepting relationship and in an emitter nozzle disposed intermediate the ends of longitudinal alignment with said means, said means at least one of said plurality of outlet passages, and said collector having a cross section substantially a collector in a spaced, longitudinally aligned, stream smaller than that of said passage, and
  • utilization means arranged to thereafter receive the stream fluid, said stream upstream from said chamber being insensitive to changes in stream conditions downstream from said chamber.
  • each said collector 236113-172 3 gl has a funnel-like portion facing each said emitter nozzle. 3 33 5 4 at a 7 8 11.
  • the system of dam 9 whereln said fluid 1s a gas. 3:336:931 8/1967 FOX et a1. 137815 12.
  • the system of claim 9 wherein said fluid is a liquid.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)
US3428065D 1965-02-16 1965-02-16 Feedback isolator Expired - Lifetime US3428065A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US43309665A 1965-02-16 1965-02-16

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US3428065A true US3428065A (en) 1969-02-18

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US3428065D Expired - Lifetime US3428065A (en) 1965-02-16 1965-02-16 Feedback isolator

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US (1) US3428065A (es)
DE (2) DE1523469C3 (es)
ES (1) ES322724A1 (es)
GB (1) GB1140191A (es)
NL (1) NL6601450A (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628774A (en) * 1971-03-17 1971-12-21 Bendix Corp Fluidic fluid-metering system
US3698413A (en) * 1969-09-15 1972-10-17 Bendix Corp Fluidic fluid metering system
US3720218A (en) * 1971-12-07 1973-03-13 Us Army High speed decoupled fluidic switching device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4874016A (en) * 1989-02-28 1989-10-17 Allied-Signal Inc. Method for improving signal-to-noise ratios in fluidic circuits and apparatus adapted for use therewith

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3261372A (en) * 1963-05-06 1966-07-19 Honeywell Inc Fluid control element
US3272215A (en) * 1963-10-29 1966-09-13 Johnson Service Co Fluid control apparatus
US3326227A (en) * 1964-01-07 1967-06-20 Ibm Pulse powered fluid device with flow asymmetry control
US3336931A (en) * 1964-09-16 1967-08-22 Sperry Rand Corp Fluid logic vortex apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3261372A (en) * 1963-05-06 1966-07-19 Honeywell Inc Fluid control element
US3272215A (en) * 1963-10-29 1966-09-13 Johnson Service Co Fluid control apparatus
US3326227A (en) * 1964-01-07 1967-06-20 Ibm Pulse powered fluid device with flow asymmetry control
US3336931A (en) * 1964-09-16 1967-08-22 Sperry Rand Corp Fluid logic vortex apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3698413A (en) * 1969-09-15 1972-10-17 Bendix Corp Fluidic fluid metering system
US3628774A (en) * 1971-03-17 1971-12-21 Bendix Corp Fluidic fluid-metering system
US3720218A (en) * 1971-12-07 1973-03-13 Us Army High speed decoupled fluidic switching device

Also Published As

Publication number Publication date
DE1523469A1 (de) 1969-07-31
GB1140191A (en) 1969-01-15
DE1523469B2 (de) 1974-11-28
DE1523469C3 (de) 1975-07-10
ES322724A1 (es) 1966-07-16
DE1973188U (de) 1967-11-23
NL6601450A (es) 1966-08-17

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