GB1213366A - Air velocity measuring system - Google Patents

Air velocity measuring system

Info

Publication number
GB1213366A
GB1213366A GB5330868A GB5330868A GB1213366A GB 1213366 A GB1213366 A GB 1213366A GB 5330868 A GB5330868 A GB 5330868A GB 5330868 A GB5330868 A GB 5330868A GB 1213366 A GB1213366 A GB 1213366A
Authority
GB
United Kingdom
Prior art keywords
conduit
air
aperture
velocity
air velocity
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
Application number
GB5330868A
Inventor
Alfred Arthur Obermaier
Martin Joseph Pierman
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.)
ILLINOIS TESTING LABORATORIES
Original Assignee
ILLINOIS TESTING LABORATORIES
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ILLINOIS TESTING LABORATORIES filed Critical ILLINOIS TESTING LABORATORIES
Publication of GB1213366A publication Critical patent/GB1213366A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
    • G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
    • G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
    • G01F1/40—Details of construction of the flow constriction devices
    • G01F1/46—Pitot tubes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
    • G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
    • G01P21/025—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers for measuring speed of fluids; for measuring speed of bodies relative to fluids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
    • G01P5/14—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid
    • G01P5/16—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring differences of pressure in the fluid using Pitot tubes, e.g. Machmeter

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)

Abstract

1,213,366. Measuring fluid flow. ILLINOIS TESTING LABORATORIES Inc. Nov. 11, 1968 [Nov. 13, 1967], No.53308/68. Heading G1R. In an air velocity probe, such as for use in an air velocity measuring system including an air velocity measuring device having an input and an output, comprising a conduit 16, a pair of tubes 20, 21, preferably of D-shaped cross-section longitudinally positioned within the conduit 16 and an air flow control member 28 telescoped in the end of the conduit 16 the arrangement is such that an air stream 38, having a total pressure consisting of velocity and static pressures, enters a passageway 30 and the velocity pressure component 40 is diverted, primarily, by a fixed baffle 36 into the tube 20 and a variable baffle 31 effects a fine adjustment of the air flow 40 to match a pressure indicated by a pilot tube standard. The air velocity component 40 is directed through a transverse aperture 48 into a chamber 54 of a range adjusting switch 12, containing a rubber bushing 54 against which the end 19 of the conduit 16 abuts and passes through a filter 60 into a tube 90 and through a duct 64, by-passing the filter 60, to the downstream side of the baffle 36. A rotatable range switch plate 66, rotated by a spring biased screw 68, is mounted at the lower end of the switch 12 and is provided with a plurality of co-operative pairs of apertures 70, 71, 72, 73 and a control aperture 74, Fig. 6A (not shown) which aperture 74 coacts with a screw 76 for securing the plate in position if needle valve 80 is housed in each aperture 72, 73 and places a different precalibrated resistance in the air stream path and therefore increases the range of the measuring apparatus.
GB5330868A 1967-11-13 1968-11-11 Air velocity measuring system Expired GB1213366A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US68708467A 1967-11-13 1967-11-13

Publications (1)

Publication Number Publication Date
GB1213366A true GB1213366A (en) 1970-11-25

Family

ID=24758974

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5330868A Expired GB1213366A (en) 1967-11-13 1968-11-11 Air velocity measuring system

Country Status (1)

Country Link
GB (1) GB1213366A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112114167A (en) * 2020-10-14 2020-12-22 中国计量科学研究院 Airflow flow velocity detection and calibration device and system for biological safety cabinet
RU207837U1 (en) * 2021-06-02 2021-11-18 Максим Николаевич Карпов Flow meter probe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112114167A (en) * 2020-10-14 2020-12-22 中国计量科学研究院 Airflow flow velocity detection and calibration device and system for biological safety cabinet
CN112114167B (en) * 2020-10-14 2022-05-10 中国计量科学研究院 Airflow flow velocity detection and calibration device and system for biological safety cabinet
RU207837U1 (en) * 2021-06-02 2021-11-18 Максим Николаевич Карпов Flow meter probe

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee