US3744525A - Momentum-interaction type fluidic devices - Google Patents

Momentum-interaction type fluidic devices Download PDF

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Publication number
US3744525A
US3744525A US00068965A US3744525DA US3744525A US 3744525 A US3744525 A US 3744525A US 00068965 A US00068965 A US 00068965A US 3744525D A US3744525D A US 3744525DA US 3744525 A US3744525 A US 3744525A
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United States
Prior art keywords
jet
power
control
input
nozzles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00068965A
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English (en)
Inventor
G Davies
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Plessey Overseas Ltd
Original Assignee
GE Healthcare UK Ltd
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Assigned to PLESSEY OVERSEAS LIMITED reassignment PLESSEY OVERSEAS LIMITED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PLESSEY COMPANY LIMITED THE
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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
    • F15C1/14—Stream-interaction devices; Momentum-exchange devices, e.g. operating by exchange between two orthogonal fluid jets ; Proportional amplifiers
    • 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]
    • Y10T137/2164—Plural power inputs to single device
    • Y10T137/2169—Intersecting at interaction region [e.g., comparator]
    • 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
    • Y10T137/224—With particular characteristics of control input
    • Y10T137/2245—Multiple control-input passages

Definitions

  • ABSTRACT In order to permit a fluidic amplifier of the momentum- 'i interaction type to receive, in addition to its main con- 5 Fie'ld 137/81 5 trol by a pair of transverse control jets, a secondary control input, its power input is arranged in the form of two jet nozzles 2A and 28 respectively aligned with the [56] References cued output branches at the two sides of asplitter wedge 15, UNITED STATES PATENTS thus permitting a pressure difference representing the 3,331,379 7/1967 Bowles 137/815 secondary control input to be applied between the two SOWCI'S...
  • This invention relates to the control of momentuminteraction type fluidic devices, more particularly fluidic amplifiers, and has for an object to provide improved devices of this kind which lend themselves to the introduction of a secondary control unit.
  • the facility of such secondary input is in many cases desirable, for example to introduce a time-differential dependent function of a primary input to achieve a certain degree of transient or dynamic response.
  • a secondary control facility is provided by supplementing or replacing momentum-interaction type fludic device, more particularly of a fluidic amplifier by an arrangement having two separate input-flow passages arranged to produce two input jets inclined in opposite directions to the longitudinal axis of the device thus permitting a secondary input to be applied as a pressure difference between these two inlets, the arrangement being such that the jets from the two input passages combine to form a single jet which in the absence of a secondary input extends along the longitudinal axis of the device, i.e., the axis, in which in a normal amplifier, the power jet is arranged to operate.
  • FIG. 1 shows the arrangement of the passages in a customary momentum-interaction proportional fluidic amplifier having a single pair of control-input connections
  • FIG. 2 similarly illustrates double-input momentuminteraction amplifier as'previously proposed for the provision of a secondary-input facility.
  • FIG. 3 illustrates one form of improved amplifier according to thepresentinvention, which while simpler in construction provides facilities equivalent to those provided by the amplifier shown in FIG. 2,
  • FIG. 4 illustrates a fluidic arrangement in which an amplifier as shown in FIG. 3 is combined with transient-bias means arranged to produce the secondary input.
  • a fluidic amplifier of the momentum-interaction type has a power-input connection 1 leading to a power nozzle 2.
  • This nozzle is adapted to produce a power jet of operating fluid and is normally so arranged that this power jet will produce equal pressures and/or equal rates of flow at two output ports 3 and 4 which are inclined, symmetrically to each other, in opposite directions to the axis of the jet produced by the nozzle 2 and separated from each other by a splitter portion 15.
  • the amplifier is further provided with a pair of control-input nozzles 7 and 8. These extend at right angles to the axis of the power jet, and a control-input pressure difference can be applied between their inlets 9 and 10 respectively to pro Jerusalem a control jet transverse to the power jet.
  • This control jet will operate to divert the power jet so as to increase the amount of flow and/or the pressure in output port 3 over that in output port 4 or vice versa, according to the direction of the pressure difference producing the control jet.
  • the same reference numerals as for FIG. 1 are employed to indicate corresponding elements.
  • a second pair of control-input ports 11, 12 having input connections 13 and 14 to which a secondary control-pressure difference can be applied, are arranged between the main control ports 7, 8 and the vents 5, 6. It will be seen that in this construction,'in order to get a reasonable approach to ideal action conditions, the direction of the main control nozzles 7 and 8 had to be changed somewhat to one side of a line at right angles to the main power jet, the secondary control ports being offset from this line by the same amount in the opposite direction.
  • FIG. 3 illustrates an amplifier according to the'present invention.
  • the same reference numerals as in FIG. 1 have again been employed for corresponding parts, and it will be readily appreciated that it was possible to maintain most elements in the same form and mutual arrangement as in the single-control amplifier of FIG. 1.
  • the power-jet inlet 1 and power-jet nozzle 2 which extend along the longitudinal axis of the device of FIG. 1, have, however, been replaced by a pair of inlets 1A and 1B each provided with a power jet nozzle 2A and 2B respectively, these two nozzles being inclined oppositely and symmetrically to the longitudinal axis of the device, In the illustrated preferred form they are in substantial respective alignment with the two outlets 4 and 3 of the device.
  • both inlets 1A and 1B are sup-- plied with fluid under the same pressure
  • the jets formed by the nozzles 2A and 28 will combine to form a single jet flowing along the longitudinal axis of the device, while when, in order to achieve a secondary control, a pressure difference is applied between the inlets 1A and 1B, the combined jet formed by combination of the jets issuing from the nozzles 2A and 28 will be inclined, in accordance with the amount and sign of this pressure difference, towards one or the other of the outlets 3 and 4 which are separated by the splitter 15 v of the amplifier.
  • FIG. 4 the device of FIG. 3 is shown connected to means for deriving from a main-control pressure difference, a transient bias in the form of a pressure difference, which is applied between the inlets 1A and 13 as a secondary input.
  • a power-input pressure source 17 is connected to the input end 1A of one of the power-jet nozzles 2A and this input end 1A is also connected to a reservoir 20 via a venturi 21, while the input end 18 of the other power-jet nozzle 28 is arranged at the throat of the venturi 21.
  • the one nozzle 7 has been connected at 10 to a point under reference pressure, while the same pressure source 17 which feeds the power inlet 1A and whose pressure is presumed to be variable, is applied, via a so-called planar jet collector 16 to control input 9 leading to the other main control nozzle 8.
  • the jet collector chamber 16 is vented to the environmental atmosphere, so as to cause the pressure difference between the two control inlets 9 and to be affected, in a non-linear fashion, by the environmental atmospheric pressure, as well as by the pressure of the input source 17.
  • the outputs 3 and 4 are shown connected to the control-input nozzles 7b, 8b of a further amplifier stage 18A which may be constructed as shown in FIG. 1.
  • the system illustrated in FIG. 4 may, for example, be employed for the control of the compressor-intake vanes of a gas-turbine engine in a manner which is explained in more detail in our copending application corresponding to British Pat. application No. 44708/69.
  • the jet collector chamber 16 instead of being vented to the atmosphere, may communicate with some other reference pressure, which may be variable.
  • a pure-fluidic device for the production of a continuously variable output which comprises in combination: a body formed with an inter-action chamber, with two power-jet nozzles leading into said chamber with their axes intersecting at an acute angle to produce two component jets which join to form a composite power jet whose angular direction varies continuously, within the plane defined by the two component jets, between the respective directions of the two component jets ac.- cording to the ratio of the respective flow rates in the two said nozzles, with two power-jet inlet ducts, one for each nozzle, for respective connection of the said nozzles to two fluid sources of independently variable pressures, with two output passages extending from the inter-action chamber at points which are respectively in the path of such composite power jet at two different angular directions thereof in said plane, and with a jet splitter forming a wedge that separates the two said output passages at their ends connected to the interaction chamber, and in which said body is further provided with a control-input passage leading into the inter-action chamber to produce
  • a fluidic device as claimed in claim 1 which includes a planar jet collector attached to the said control input passage for connection to a control-input pressure.

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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)
  • Measuring Volume Flow (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Measuring Fluid Pressure (AREA)
US00068965A 1969-09-10 1970-09-02 Momentum-interaction type fluidic devices Expired - Lifetime US3744525A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4470769 1969-09-10

Publications (1)

Publication Number Publication Date
US3744525A true US3744525A (en) 1973-07-10

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ID=10434416

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Application Number Title Priority Date Filing Date
US00068965A Expired - Lifetime US3744525A (en) 1969-09-10 1970-09-02 Momentum-interaction type fluidic devices

Country Status (7)

Country Link
US (1) US3744525A (enrdf_load_stackoverflow)
JP (1) JPS491915B1 (enrdf_load_stackoverflow)
DE (1) DE2044913A1 (enrdf_load_stackoverflow)
FR (1) FR2061635B1 (enrdf_load_stackoverflow)
GB (1) GB1304009A (enrdf_load_stackoverflow)
SE (1) SE360151B (enrdf_load_stackoverflow)
SU (1) SU433693A3 (enrdf_load_stackoverflow)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1400686A (fr) * 1964-05-28 1965-05-28 Comparateur-différentiateur de fluide
US3444876A (en) * 1966-09-19 1969-05-20 Us Army Proportional comparator

Also Published As

Publication number Publication date
DE2044913A1 (de) 1971-03-11
GB1304009A (enrdf_load_stackoverflow) 1973-01-24
FR2061635B1 (enrdf_load_stackoverflow) 1976-03-19
FR2061635A1 (enrdf_load_stackoverflow) 1971-06-25
SU433693A3 (ru) 1974-06-25
SE360151B (enrdf_load_stackoverflow) 1973-09-17
JPS491915B1 (enrdf_load_stackoverflow) 1974-01-17

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Owner name: PLESSEY OVERSEAS LIMITED

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PLESSEY COMPANY LIMITED THE;REEL/FRAME:003962/0736

Effective date: 19810901