US3677276A - Interruptible jet sensor - Google Patents

Interruptible jet sensor Download PDF

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Publication number
US3677276A
US3677276A US77595A US3677276DA US3677276A US 3677276 A US3677276 A US 3677276A US 77595 A US77595 A US 77595A US 3677276D A US3677276D A US 3677276DA US 3677276 A US3677276 A US 3677276A
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US
United States
Prior art keywords
fluid
jet
sensor port
nozzle
sensor
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
Application number
US77595A
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English (en)
Inventor
Anthony Kopera
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.)
Bowles Fluidics Corp
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Bowles Fluidics Corp
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Filing date
Publication date
Application filed by Bowles Fluidics Corp filed Critical Bowles Fluidics Corp
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Classifications

    • 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
    • F15C1/005—Circuit elements having no moving parts for measurement techniques, e.g. measuring from a distance; for detection devices, e.g. for presence detection; for sorting measured properties (testing); for gyrometers; for analysis; for chromatography
    • 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
    • Y10T137/0318—Processes
    • Y10T137/0396—Involving pressure control
    • 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
    • Y10T137/2278—Pressure modulating relays or followers
    • Y10T137/2322—Jet control type

Definitions

  • the present invention relates to object detection and more I particularly to object detection by means of interruptible fluid results from the fact that the jet entrains dust, dirt particles,
  • the sensor port communicates with a fluid supply passage arranged to aspirate the outlet passage when the sensing jet is interrupted.
  • the pressure of fluid in the supply passage is selected to prevent the uninterrupted jet from entering the sensor port. In this manner, impact of the jet against supply fluid occurs just outside the sensor port, creating a back pressure therein which in turn diverts the clean supply fluid into the outlet passage.
  • the sensing jet When no object is present in gap 11, as illustrated in FIG. 3, the sensing jet is uninterrupted and impinges against fluid issued from nozzle 25.
  • the size of restrictor 23 in secondary supply passage 21 is chosen so that the total pressure of fluid supplied to nozzle 25 from secondary supply passage 21 is equal to or just slightly greater than the total pressure of the sensing jet at the sensor opening (i.e. at the termination of nozzle 25). This prevents the sensing jet (and its entrained impurities) from ever entering nozzle .25. However, the flow balance condition achieved at the sensor opening between the jet and the secondary supply fluid creates a back pressure in nozzle 25 which diverts secondary supply fluid into nozzle'29.
  • This fluid increases the pressure in outlet passage 27 to a relatively high level.
  • the device of the present invention minimizes the possibility of contamination of an output device connected to the outlet passage.
  • an output device may be, for example, a fluidic OR/NOR gate such as the type described in US. Pat. No. 3,340,885.
  • FIG. 1 is a view in perspective of an interruptible jet sensor according to the present invention
  • FIGS. 2 and 3 are diagrammatic illustrations of respective operating modes of the sensor of FIG. 1;
  • FIG. 4 is an enlarged partial view in plan of an alternative embodiment of the sensor of FIG. 1.
  • a sensor 10 has an outline contour which defines a generally U-shaped gap 11. Pressurized fluid, for example, air, is received through a fitting l3 and causes a fluid jet to be issued across gap 11. In the manner to be described below, interruption of the jet by an object in gap 11 provides a relatively low pressure at an output fitting 15. When the jet is uninterrupted a relatively high pressure appears at fitting l5.
  • Pressurized fluid for example, air
  • inlet fitting 11 supplies the pressurized fluid to a primary supply passage 17 which feeds a nozzle 19 terminating at one side of gap 11.
  • a portion of the pressurized fluid in primary supply passage 17 is also fed to secondary supply passage 21 which includes a flow restrictor 23 and which feeds another nozzle 25 terminating directly across gap 11 from and in alignment with nozzle 19.
  • the termination of nozzle 25 defines the sensor port or opening of the unit.
  • An outlet passage 27 terminates at one end at output fitting 15 of FIG. 15.
  • the other end of outlet passage 27 is fed from an output nozzle 29 which terminates angularly at nozzle 25. More specifically, nozzle 29 terminates at an angle of about 30 relative to nozzle 25 and at a location upstream of the sensor port.
  • the pressurized fluid supplied to primary supply passage 17 is filtered and substantially free from dirt and other foreign particles.
  • the pressure of the supply fluid is such to cause a pressure drops to low, sensing jet fluid will be permitted to enter nozzle 25 and outlet passage 27.
  • restrictor 23 must be increased in size if the output device requires a larger flow than originally contemplated.
  • FIG. 4 It is possible to provide for improved jet pressure recovery at the sensing port without enlarging nozzle 29 in its entirety.
  • nozzle 25 is narrower upstream of its intersection with nozzle 29 than downstream thereof at region 25.
  • the widening at downstream region 25 is effected by cutting back the noule wall through which nozzle 29 communicates.
  • the advantage of this arrangement is that the narrower upstream portion of nozzle 25 presents a relatively high impedance to reverse flow, thereby providing more secondary supply fluid to the outlet passage.
  • a sensor comprising:
  • a fluid supply passage terminating in a sensor port and arranged to flow pressurized fluid through said sensor port;
  • An interruptible jet sensor comprising:
  • a body having a contour wherein two sidewalls define a gap therebetween, one of said sidewalls having a sensor port defined therein and opening into said gap;
  • supply means for issuing supply fluid from said sensor port at sufficient pressure to balance said jet proximate said sensor port and prevent inflow of fluid from said jet into said sensor port, thereby providing a relatively high pressure in said sensor port;
  • output means for sensing said relatively high pressure at said sensor port, said output means comprising a fluid passage disposed at an angle with respect to said sensor port to permit said supply fluid to aspirate fluid from said fluid passage whenever said fluid jet is blocked from impinging against said supply fluid.
  • An interruptible jet sensor comprising a body having defined therein:
  • a nozzle arranged to receive pressurized fluid from said first fluid passage and issue a fluid jet across said gap;
  • a second fluid passage arranged to receive pressurized fluid from said first fluid passage, said second fluid passage including a flow restrictor;
  • a second nozzle terminating across said gap from said first nozzle and arranged to receivepressurized fluid from said second fluid passage and issue same into said gap;
  • an outlet passage terminating at said second nozzle and arranged to be aspirated by fluid issuing into said gap from said second nozzle and to receive fluid from said second nozzle when the pressure in said gap is greater than ambient;
  • the size of said flow restrictor is chosen such that for a predetermined pressure of fluid applied to said first fluid said jet and fluid issued from said second nozzle achieve a flow balance sufficiently proximate said second nozzle to thereby increase the pressure in said second noule above ambient.
  • outlet passage is disposed at an angle of approximately 30 relative to said second fluid passage at said second nozzle to permit efficient aspiration of fluid from said second nozzle whenever said fluid jet is blocked from impinging against fluid issued from said second nozzle in said open gap area.
  • the step of sensing comprises aspirating a fluid outlet passage communicating with said sensor port when said jet is interrupted and supplying fluid from upstream of said sensor port to said outlet passage when said jet is uninterrupted.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Analytical Chemistry (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Measuring Arrangements Characterized By The Use Of Fluids (AREA)
  • Measuring Volume Flow (AREA)
  • Measuring Fluid Pressure (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
US77595A 1970-10-02 1970-10-02 Interruptible jet sensor Expired - Lifetime US3677276A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US7759570A 1970-10-02 1970-10-02

Publications (1)

Publication Number Publication Date
US3677276A true US3677276A (en) 1972-07-18

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Application Number Title Priority Date Filing Date
US77595A Expired - Lifetime US3677276A (en) 1970-10-02 1970-10-02 Interruptible jet sensor

Country Status (8)

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US (1) US3677276A (enExample)
AT (1) AT322877B (enExample)
BE (1) BE773318A (enExample)
CH (1) CH531652A (enExample)
DE (1) DE2149006B2 (enExample)
FR (1) FR2109863A5 (enExample)
GB (1) GB1369822A (enExample)
IT (1) IT939436B (enExample)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877485A (en) * 1973-06-15 1975-04-15 Dana Corp Fluidic sensor
US3986856A (en) * 1974-11-18 1976-10-19 Saint-Gobain Industries Blowing apparatus having individual control of nozzles
US6267642B1 (en) * 1998-02-14 2001-07-31 Lam Research Corporation Sensing the presence of a wafer
NL1034674C2 (nl) * 2007-11-12 2008-12-29 Johannes Cornelis Gerard Groot Bandbesturingssysteem.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3021026C2 (de) * 1980-06-03 1983-12-29 Samson Ag, 6000 Frankfurt Vorrichtung zur Überwachung der Funktionsfähigkeit eines Bohrwerkzeugs oder sonstigen beweglichen Organs

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2919712A (en) * 1956-05-25 1960-01-05 Gpe Controls Inc Fluid jet edge position detector
US3285608A (en) * 1964-10-05 1966-11-15 Pitney Bowes Inc Pneumatic sheet detecting control means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2919712A (en) * 1956-05-25 1960-01-05 Gpe Controls Inc Fluid jet edge position detector
US3285608A (en) * 1964-10-05 1966-11-15 Pitney Bowes Inc Pneumatic sheet detecting control means

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877485A (en) * 1973-06-15 1975-04-15 Dana Corp Fluidic sensor
US3986856A (en) * 1974-11-18 1976-10-19 Saint-Gobain Industries Blowing apparatus having individual control of nozzles
US6267642B1 (en) * 1998-02-14 2001-07-31 Lam Research Corporation Sensing the presence of a wafer
US6283827B1 (en) * 1998-02-14 2001-09-04 Lam Research Corporation Non-contacting support for a wafer
US6796881B1 (en) 1998-02-14 2004-09-28 Lam Research Corporation Sensing the presence of a wafer
NL1034674C2 (nl) * 2007-11-12 2008-12-29 Johannes Cornelis Gerard Groot Bandbesturingssysteem.

Also Published As

Publication number Publication date
CH531652A (de) 1972-12-15
AT322877B (de) 1975-06-10
DE2149006A1 (de) 1972-04-13
GB1369822A (en) 1974-10-09
IT939436B (it) 1973-02-10
DE2149006B2 (de) 1973-06-07
BE773318A (fr) 1972-01-17
FR2109863A5 (enExample) 1972-05-26

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