EP0682772A1 - Sonde rheometrique - Google Patents

Sonde rheometrique

Info

Publication number
EP0682772A1
EP0682772A1 EP95903786A EP95903786A EP0682772A1 EP 0682772 A1 EP0682772 A1 EP 0682772A1 EP 95903786 A EP95903786 A EP 95903786A EP 95903786 A EP95903786 A EP 95903786A EP 0682772 A1 EP0682772 A1 EP 0682772A1
Authority
EP
European Patent Office
Prior art keywords
measuring probe
outer tube
flow measuring
electrodes
pipeline
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.)
Withdrawn
Application number
EP95903786A
Other languages
German (de)
English (en)
Inventor
Patrick Berdillon
Michel Claudin
Sven Hirt
Sören LESER
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.)
Endress and Hauser Flowtec AG
Original Assignee
Endress and Hauser Flowtec AG
Flowtec AG
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 Endress and Hauser Flowtec AG, Flowtec AG filed Critical Endress and Hauser Flowtec AG
Priority to EP95903786A priority Critical patent/EP0682772A1/fr
Publication of EP0682772A1 publication Critical patent/EP0682772A1/fr
Withdrawn legal-status Critical Current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
    • G01F1/20—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
    • G01F1/28—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 by drag-force, e.g. vane type or impact flowmeter
    • 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
    • G01P5/02—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring forces exerted by the fluid on solid bodies, e.g. anemometer
    • G01P5/04—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring forces exerted by the fluid on solid bodies, e.g. anemometer using deflection of baffle-plates

Definitions

  • the invention relates to flow measuring probes which can be inserted into the wall of a pipeline through which a fluid flows, practically perpendicular to the longitudinal axis thereof.
  • DE-A 36 16 777 describes a flow measuring probe which serves to measure the mass pulse flow of a flowing fluid and which is inserted practically perpendicular to the longitudinal axis of a pipe through which a fluid flows,
  • EP-A 26 715 also describes a flow measuring probe which serves to measure the volume of a flowing fluid and which is inserted practically perpendicular to the longitudinal axis of the pipeline through which the fluid flows,
  • an inflow surface is arranged at an angle of 90 ° with respect to the longitudinal axis of the pipeline.
  • DE-A 24 13 245 describes a flow measuring probe which is used to measure the flow and which is inserted into the wall of a pipeline through which the fluid flows practically perpendicular to its longitudinal axis, with a mechanically clamped in the wall into the flowing fluid immersed and deflectable under a force exerted by it and
  • an inflow surface is arranged at an angle of 90 ° with respect to the longitudinal axis of the pipeline
  • the invention therefore consists in a flow measuring probe which can be inserted into a wall of a pipeline through which a fluid flows, practically perpendicular to its longitudinal axis,
  • the capacitive sensor described in US Pat. No. 4,716,770 in connection with a vortex flow meter - but only for two capacitances - which is however modified in accordance with the invention.
  • the sensor described above is not immersed in the free flow, but is arranged in a bore in the bluff body to which the fluid has access. There the pressure fluctuations generated by the vortices detaching from the bluff body are measured. In contrast, the force exerted directly on the bluff body by the flowing fluid is measured in the invention.
  • the outer tube carries an insulating layer with an applied electrode layer on the inner surface near the end, which forms capacitors with the electrodes.
  • a bluff body is provided, of which an inflow surface is arranged at an angle deviating from 90 ° with respect to the longitudinal axis of the pipeline. According to a development of this embodiment of the invention, an angle of practically 45 ° is provided between the inflow surface of the bluff body and the longitudinal axis of the pipeline.
  • four electrodes are provided at an angle of 45 ° between the sectional plane and the longitudinal axis of the pipeline.
  • an insulating layer is provided on the inner surface of the outer pipe near the end, which carries an electrode layer which is in contact with the four Electrode capacitors.
  • FIG. 1 shows in perspective a flow measuring probe inserted in a pipeline
  • FIG. 4 shows a bottom view of a flow measuring probe with four capacities
  • FIG. 5 shows a development of the arrangement according to FIG. 3 in a longitudinal sectional view.
  • Fig. 1 is one in perspective in the wall
  • Pipe 1 inserted and there mechanically rigidly clamped flow measuring probe 2 is shown, the part of which protrudes into the pipe 1 in the manner of a bending beam or a cantilever is immersed in a fluid 3 flowing in the pipe 1, as can be seen at the cut-open point of the pipe 1 .
  • the flow measuring probe 2 has a housing 4 in which evaluation electronics for the signals generated by the flow measuring probe 2 are accommodated.
  • the fluid 3 flowing in the pipeline 1 can be a liquid, e.g. Water or milk, a steam, a gas, e.g. Air, or a powdery substance.
  • FIG. 1 With regard to the outer structure of the flow measuring probe 2, it can also be seen from FIG. 1 that it has a metallic outer tube 5 with a bluff body 6 which is attached to the tightly closed free end of the outer tube 5.
  • An inflow surface of the bluff body 6 is arranged at an angle, preferably deviating from 90 °, with respect to the longitudinal axis of the pipeline 1.
  • the bluff body 6 is preferably, as can be seen in FIGS. 1 and 2, a circular plate; however, other two- and / or three-dimensional shapes of the bluff body 6 are also possible.
  • FIG. 2a shows the fastening by means of a union nut 7 which is to be screwed tightly with a threaded connector attached to the wall of the pipeline.
  • FIG. 2b shows, instead of the union nut 7 from FIG. 2a, a flat plate 8 which is to be fastened tightly to a counterplate attached to the pipeline 1 in the manner of a so-called triclamp connection.
  • FIG. 2 c instead of the union nut 7 from FIG. 2 a, part 9 of a milk pipe connection that is common in Europe is shown, the counterpart of which is located on the pipeline 1.
  • FIG. 2d shows that a flange connection is also possible; there is a flange 10 on the flow measuring probe 2, the counter flange of which is attached to the pipeline 1.
  • FIGS. 3 to 5 A partial section of the flow measuring probe 2 is shown in the partial figure 3a of FIG. 3, and a bottom view of the flow measuring probe 2 is shown in the partial figure 3b thereof.
  • the bluff body 6 is omitted for reasons of clarity.
  • an inner tube 11 is spaced and rigidly arranged, which protrudes into the cavity 12 of the outer tube 5 and thus from the latter acting forces is decoupled.
  • the inner tube 11 and outer tube 5 are preferably made of stainless steel.
  • the inner tube 11 has two sections of different diameters.
  • a first section 11a has a larger outer diameter than a second section 11b, which carries an even number of electrodes 13, 14, which are insulated and symmetrical with respect to a section plane containing the axis of the inner pipe 11 and which form capacitors with the inner surface of the outer pipe 5.
  • two electrodes are provided, as can be seen. They are arranged near the free end of the outer tube 5, where its deflection is greatest.
  • the diameter line X-X can be seen in this figure from the section plane mentioned, which runs perpendicular to the plane of the drawing in FIG. 3b.
  • the electrodes 13, 14 are attached to the outer surface of the inner tube 11 with the interposition of an insulating part 15.
  • the insulating part 15 can e.g. consist of an adhesive layer by means of which e.g. foil-like, metal of the electrodes 13, 14 is fastened on the section 11b of the inner tube 11.
  • the outer tube 5 is sealed at its free end by a closure body 17.
  • the electrodes 13, 14 cover the largest part of the circumferential surface of the second section 11b of the inner tube 11 and the lower end face of the insulating part 15, where a gap 18, 19 is left open Feed lines 20, 21 are attached to them. These lead through the hollow interior of the inner tube 11 into the housing 4 to the evaluation electronics located therein.
  • FIG. 4 shows a bottom view corresponding to FIG. 3b of a preferred development with four electrodes 22, 23, 24, 25 arranged symmetrically to the cutting plane mentioned. As a result, there are two further gaps 26, 27, so that the four electrodes 22, 23, 24, 25 are galvanically separated from one another.
  • the feed lines 20, 21 and the two further feed lines corresponding to these are omitted in FIG. 4 for the sake of clarity.
  • the diameter line X-X of the section plane mentioned is to be aligned so that it forms an angle of practically 45 ° with the longitudinal axis of the pipeline 1.
  • this orientation there are two electrodes facing each other, e.g. the electrodes 23, 24, vertically above or below the longitudinal axis of the pipeline 1, while this longitudinal axis then cuts the two other electrodes 22, 25 lying opposite one another in the middle.
  • FIG. 5 shows a detail of a development of the arrangement according to FIG. 3 in a longitudinal sectional view, in which the inner surface of the outer tube 5 serves as a common electrode of the two electrodes 13, 14.
  • this common electrode is at the potential of the circuit zero point of the evaluation electronics mentioned, which of course limits the possibilities of wiring all the capacitor electrodes.
  • an insulating layer 31 is arranged on the inner surface of the outer tube 5 near the end, which has an electrode layer 32 applied thereon. This then forms corresponding capacitors with the electrodes 13, 14 or 22, 23, 24, 25 arranged on the inner tube 11.
  • the electrode layer 32 can be provided with a feed line.
  • the flow measuring probe of the invention with two electrodes, together with a corresponding circuit can serve as a flow monitor, with which the flow or the non-flow of the fluid 3 can be monitored.
  • Such circuits are common and are outside the scope of the invention.
  • the flow measuring probe according to the invention with four electrodes can be used together with a corresponding circuit for the continuous measurement of flow velocity, volume flow, mass flow, density and / or viscosity of the fluid 3. Since there are four capacities influenced by the flow, of which two are influenced essentially in opposite directions, at least two signals which are practically independent of one another can be evaluated. Circuits for this are also common and are outside the scope of the invention.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

Une sonde rhéométrique peut, selon différents modes de réalisation et/ou des agencements divers de ses composants, servir de dispositif de surveillance d'un courant, de capteur de la vitesse d'écoulement, du débit volumétrique, du débit massique et/ou de la densité. A cet effet la sonde (1), qui peut être insérée, pratiquement perpendiculairement à son axe longitudinal, dans une paroi d'une canalisation (1) traversée par un fluide (3), comprend un tube métallique extérieur (5) hermétiquement fermé à son extrémité libre qui d'un côté est relié de manière mécaniquement rigide à la paroi de la canalisation, qui est immergé dans le fluide en écoulement et qui peut être fléchi par une force exercée par le courant à la manière d'une barre flexible. La sonde (2) comprend en outre un corps de retenue (6) monté à l'extrémité libre du tube extérieur et un tube intérieur (11) fixé à l'intérieur du tube extérieur (5) avec un certain écartement. Le tube intérieur (11) porte sur au moins une partie de sa surface extérieure un nombre pair d'électrodes (13, 14) isolées et agencées symétriquement par rapport à un plan de coupe qui contient l'axe du tube intérieur. Ces électrodes (13, 14) forment des condensateurs avec le tube extérieur.
EP95903786A 1993-12-07 1994-12-01 Sonde rheometrique Withdrawn EP0682772A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP95903786A EP0682772A1 (fr) 1993-12-07 1994-12-01 Sonde rheometrique

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP93119668 1993-12-07
EP93119668 1993-12-07
EP95903786A EP0682772A1 (fr) 1993-12-07 1994-12-01 Sonde rheometrique
PCT/EP1994/003993 WO1995016186A1 (fr) 1993-12-07 1994-12-01 Sonde rheometrique

Publications (1)

Publication Number Publication Date
EP0682772A1 true EP0682772A1 (fr) 1995-11-22

Family

ID=8213468

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95903786A Withdrawn EP0682772A1 (fr) 1993-12-07 1994-12-01 Sonde rheometrique

Country Status (4)

Country Link
EP (1) EP0682772A1 (fr)
JP (1) JPH08501885A (fr)
CN (1) CN1117314A (fr)
WO (1) WO1995016186A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO317390B1 (no) * 2002-08-27 2004-10-18 Corrocean As Fremgangsmate og anordning ved stromningsmaling
GB2499995B (en) * 2012-03-05 2018-01-31 Spirax-Sarco Ltd Flow meter
JP6496315B2 (ja) * 2013-08-23 2019-04-03 ユニトラクト シリンジ プロプライエタリイ リミテッドＵｎｉｔｒａｃｔ Ｓｙｒｉｎｇｅ Ｐｔｙ Ｌｔｄ 薬剤送り出しポンプ用の一体形穿刺可能シール流体経路連結手段及び薬剤容器
CN104569480B (zh) * 2015-02-04 2018-10-16 西安科技大学 一种液体冲力流速测量仪及其测量方法
DE102015114197A1 (de) * 2015-08-26 2017-03-02 Bürkert Werke GmbH Strömungsmesser
US11248904B2 (en) 2017-03-29 2022-02-15 Rutgers, The State University Of New Jersey Systems and methods for real time measurement of surface curvature and thermal expansion of small samples
KR102400906B1 (ko) * 2021-04-26 2022-05-23 하태수 우수 감지장치

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2413245A1 (de) * 1974-03-20 1975-09-25 Eckardt Ag J Vorrichtung zum messen von durchflussmengen
DE3544198A1 (de) * 1985-12-13 1987-06-19 Flowtec Ag Wirbelstroemungsmesser
US4788869A (en) * 1986-06-27 1988-12-06 Florida State University Apparatus for measuring fluid flow
DE3801770A1 (de) * 1987-11-30 1989-06-08 Siebert & Kuehn Dr Vorrichtung zur ueberwachung der stroemung fluessiger oder gasfoermiger medien
US5144251A (en) * 1991-04-02 1992-09-01 The United States Of America As Represented By The United States Department Of Energy Three-axis particle impact probe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9516186A1 *

Also Published As

Publication number Publication date
WO1995016186A1 (fr) 1995-06-15
CN1117314A (zh) 1996-02-21
JPH08501885A (ja) 1996-02-27

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