JPS5754868A - Flow velocity and flow rate measuring device - Google Patents

Flow velocity and flow rate measuring device

Info

Publication number
JPS5754868A
JPS5754868A JP55130292A JP13029280A JPS5754868A JP S5754868 A JPS5754868 A JP S5754868A JP 55130292 A JP55130292 A JP 55130292A JP 13029280 A JP13029280 A JP 13029280A JP S5754868 A JPS5754868 A JP S5754868A
Authority
JP
Japan
Prior art keywords
eddy current
low
flow velocity
current generating
flow
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.)
Granted
Application number
JP55130292A
Other languages
Japanese (ja)
Other versions
JPS6331041B2 (en
Inventor
Masayoshi Katayama
Masaaki Ono
Kazuichi Shinoda
Shigeru Nishiyama
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.)
Hitachi Ltd
Original Assignee
Tokico Ltd
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 Tokico Ltd filed Critical Tokico Ltd
Priority to JP55130292A priority Critical patent/JPS5754868A/en
Priority to GB8128161A priority patent/GB2084324B/en
Publication of JPS5754868A publication Critical patent/JPS5754868A/en
Publication of JPS6331041B2 publication Critical patent/JPS6331041B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • G01P5/01—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by using swirlflowmeter
    • 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
    • G01F1/20—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 detection of dynamic effects of the flow
    • G01F1/32—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 detection of dynamic effects of the flow using swirl flowmeters
    • G01F1/325—Means for detecting quantities used as proxy variables for swirl
    • G01F1/3259—Means for detecting quantities used as proxy variables for swirl for detecting fluid pressure oscillations
    • 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
    • G01F1/20—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 detection of dynamic effects of the flow
    • G01F1/32—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 detection of dynamic effects of the flow using swirl flowmeters
    • G01F1/325—Means for detecting quantities used as proxy variables for swirl
    • G01F1/3273—Means for detecting quantities used as proxy variables for swirl for detecting fluid speed oscillations by thermal sensors

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Measuring Volume Flow (AREA)

Abstract

PURPOSE: To improve measuring performance in low-density of low-speed condition, in a flow velocity measuring equipment provided with a plume-like eddy current generating body in a fluid body, by making such an arrangement that width of section of the eddy current generating body is to become smaller toward the downstream and that the surface opposite to the flow is to become concave.
CONSTITUTION: A pulme-like eddy current generating body 21 is provided in a fluid body. A surface 21C opposite to a flow is formed into a concavity, and the ratio between the curvature radius R and a length (d) of the concavity 21C is selected within a range of R/d=1.4W2.5. The eddy current generating body is made of a surface 21B, width of which section is to become smaller toward the down-stream. This surface 21B is provided with a pair of eddy current detecting unit consisting of a diaphragm 22, an electrode 23, an insulation material 24, a charged liquid 25 and a through passage 26, etc. As corner of the front surface forms an acute angle, and since exfoliation of the fluid body hitting the concave section is remarkable, strength of the eddy current is increased. And therefore, flow velocity can be measured positively even in the case of a gaseous body of low fluid density, etc., and instrumental error characteristics in the low flow velocity region can be improved.
COPYRIGHT: (C)1982,JPO&Japio
JP55130292A 1980-09-19 1980-09-19 Flow velocity and flow rate measuring device Granted JPS5754868A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP55130292A JPS5754868A (en) 1980-09-19 1980-09-19 Flow velocity and flow rate measuring device
GB8128161A GB2084324B (en) 1980-09-19 1981-09-17 Vortex shedding fluid flowmeter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55130292A JPS5754868A (en) 1980-09-19 1980-09-19 Flow velocity and flow rate measuring device

Publications (2)

Publication Number Publication Date
JPS5754868A true JPS5754868A (en) 1982-04-01
JPS6331041B2 JPS6331041B2 (en) 1988-06-22

Family

ID=15030819

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55130292A Granted JPS5754868A (en) 1980-09-19 1980-09-19 Flow velocity and flow rate measuring device

Country Status (2)

Country Link
JP (1) JPS5754868A (en)
GB (1) GB2084324B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61500080A (en) * 1983-09-13 1986-01-16 ザ　フオツクスボロ　カンパニ− Vortex instrument with small flow path size
JPS6235225U (en) * 1985-08-20 1987-03-02
JP2007147418A (en) * 2005-11-28 2007-06-14 Oval Corp Vortex flowmeter having vibration transmitting means

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4694702A (en) * 1984-09-12 1987-09-22 Tokico Ltd. Vortex shedding flowmeter
US4718283A (en) * 1987-01-30 1988-01-12 Itt Corporation Vortex meter body
DE19632198C1 (en) * 1996-08-09 1998-03-12 Bosch Gmbh Robert Device for measuring the mass of a flowing medium
US6938496B2 (en) 2001-09-04 2005-09-06 Endress + Hauser Flowtec Ag Vortex flow pickup
DE10249543A1 (en) * 2002-10-23 2004-05-06 Endress + Hauser Flowtec Ag, Reinach vortex
US7603914B2 (en) 2006-07-21 2009-10-20 Endress + Hauser Flowtec Ag Measuring system with a flow conditioner arranged at an inlet of a measuring tube
US7882751B2 (en) 2007-07-19 2011-02-08 Endress + Hauser Flowtec Ag Measuring system with a flow conditioner for flow profile stabilization
DE102007063372A1 (en) * 2007-12-30 2009-07-02 Endress + Hauser Flowtec Ag Measuring system for a medium flowing in a process line
US8042411B2 (en) * 2009-06-04 2011-10-25 Invensys Systems, Inc. Small line size vortex flowmeter
CN119001140B (en) * 2024-10-18 2024-12-20 中交第一航务工程勘察设计院有限公司 Light-transmitting fluid speed measuring system and method based on image recognition

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61500080A (en) * 1983-09-13 1986-01-16 ザ　フオツクスボロ　カンパニ− Vortex instrument with small flow path size
JPS6235225U (en) * 1985-08-20 1987-03-02
JP2007147418A (en) * 2005-11-28 2007-06-14 Oval Corp Vortex flowmeter having vibration transmitting means

Also Published As

Publication number Publication date
JPS6331041B2 (en) 1988-06-22
GB2084324B (en) 1984-08-08
GB2084324A (en) 1982-04-07

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