WO1989002065A1 - Detecteur d'ecoulement - Google Patents

Detecteur d'ecoulement Download PDF

Info

Publication number
WO1989002065A1
WO1989002065A1 PCT/GB1988/000698 GB8800698W WO8902065A1 WO 1989002065 A1 WO1989002065 A1 WO 1989002065A1 GB 8800698 W GB8800698 W GB 8800698W WO 8902065 A1 WO8902065 A1 WO 8902065A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow
chamber
closure member
detector
detector according
Prior art date
Application number
PCT/GB1988/000698
Other languages
English (en)
Inventor
Adrian Scott
Original Assignee
Changestart Limited
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 Changestart Limited filed Critical Changestart Limited
Publication of WO1989002065A1 publication Critical patent/WO1989002065A1/fr

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

Definitions

  • This invention relates to flow detectors and, more particularly, to a flow detector capable of sensing relatively small flow rates.
  • Flow detectors are well known in the art and conventionally comprise a closure member, located in a fluid flow passage and displaceable between a "no- flow” position and a "flow" position or positions.
  • the present invention seeks to provide a flow detector which is sensitive to relatively small flow rates.
  • a flow detector comprising a flow chamber, a closure member supported within said chamber and displaceable between a no-flow position and a flow position or positions, a fluid inlet to the chamber to one side of the closure member and a fluid outlet from said chamber on the other side of said closure member, characterised in that -the closure member is pivotably displaceable within said chamber from its no-flow position to its flow position or positions by fluid flow through the chamber.
  • the chamber is defined by two substantially parallel plane walls connected by a substantially continuous wall.
  • the closure member comprises an elongate element of substantially uniform cross section pivotably supported on a pivot the axis of which- lies at right angles to the planes of the two parallel walls, and each end of the elongate element sweeps, or lies closely adjacent to, a section of the continuous wall, which has an arcuate configuration based on a radius centred on the pivotable axis.
  • the fluid flow passage past the elongate element is substantially constant for all those positions of the elongate element where the ends of the elongate element are sweeping their respective arcuate wall sections.
  • the elongate element adopts a substantially vertical position in a no-flow condition through the chamber and the pivotal axis for the elongate element passes through the elongate element above the centre of the gravity of the element so that gravity urges the elongate element towards its no-flow position.
  • the elongate element comprises, includes or supports a permanent magnet and the apparatus includes a sensor, such as a reed switch so located relative to the elongate element in a no- flow position that the permanent magnet closes the sensor only whilst the elongate element is in its no-flow position.
  • the sensor may conveniently be in an electrical circuit which is activated when the sensor is activated by sensing the magnetic field indicative of a no-flow condition through the chamber, and which circuit is broken when the sensor is de-activated, indicative of a flow condition through the chamber.
  • an array of sensors may be positioned to be- operated successively as the elongate element with the magnet is displaced between the no-flow position for the elongate element and the full flow position for said element.
  • the said array of reed switches may control electrical circuits which can, thereby, identify the degree of displacement of the elongate member from its no-flow position.
  • the flow detector comprises a body, generally indicated by reference numeral 11, of rectangular configuration made from a non-ferrous material.
  • a flow chamber, generally indicated by reference numeral 12 is cut into one face of the block 11 and, in practise, the chamber 0 12 will be closed by a plate of non-ferrous material (not shown in the drawings) secured to the face of block 11 by screws (not shown in the drawings).
  • the flow chamber recess 12 is of uniform depth so that the "bottom” 13 of the chamber 12 lies substantially parallel to the internal surface of the non-ferrous chamber closure plate (not shown).
  • the bottom 13 of the flow chamber and the internal surface of the chamber closure plate define parallel side walls for the chamber and the "depth" o wall 14 of • the flow chamber 12 defines a substantially continuous wall connecting the side walls of the chamber 12.
  • the flow detector is intended to operate with an external face 15 of the block 11 lowermost and substantially horizontal and, hereinafter, the terms “upper” and “lower” will apply to the device as the device is arranged to operate with the surface 15 lowermost and substantially horizontal.
  • a pivot pin 16 is outstanding from the plane of the bottom 13 of the recess, the axis of the pivot 16 being at right angles to the plane of bottom 13, and thereby horizontal when the external face 15 is horizontal, and a closure member 17 is pivotally J5 supported on the pivot 16.
  • the closure 17 is of substantially uniform rectangular cross section and the pivot pin 16 passes through the closure member 17 at a location spaced above the mid-regions of the member 17 and spaced from the upper end 17_a of the member 17, so
  • a fluid flow inlet to the chamber 12 comprises an externally threaded tubular element 18 which passes through a threaded bore in the continuous
  • a fluid supply duct 21 supplies fluid to the tubular element 18.
  • the element 18 enters into the lower regions of the flow chamber 12 and, in practise, is axially
  • the 0 continuous wall 14 in that region of the flow chamber adjacent the upper end 17ja of the element 17 is radiussed, as at 14a_, the radius being based on a radius from the axis of the pivot pin 16, so that the space between the end 17 ⁇ of element 16 and the 5 radiussed wall 14a. is substantially constant for all positions of the closure member 17 within the flow chamber 12.
  • the continuous wall 14 includes a radiussed section 14b_, based on a radius from the axis of the pivot pin 16 and which radius is slightly greater than the distance between the axis of pivot 16 and the lower end 17b_ of closure member 17 and the radiussed side wall section 14b_ is substantially constant for all positions of said end 17b_ adjacent the radiussed wall 14b_.
  • the member 17 is of substantially uniform cross section the clearance between the sides of member 17 and the bottom 13 and the closure plate (not shown) will be uniform for all positions of the member 17 within the chamber 12.
  • a fluid flow outlet defined by a tubular element 22, is entered through the side wall 14 to open into the flow chamber 12 at a location adjacent to the end 17b_ of member 17 when said member 17 is in position of- maximum displacement away from the tubular element 18 and said element 22 enters through the continuous wall 14 at a radiussed section 14 ⁇ of said wall 14.
  • the radiussed section 14c_ is based on a centre between the pivot pin 16 and the wall section 14c_.
  • the end 17b_ of the element 17 lies adjacent to the radiussed wall section 14b_ for some 80 to 85% of the total angle of displacement of the element 17 from its closure position abutting tubular element 18 to its "full flow" position (shown in broken line in the drawing) where the end 17b_ is most remote from the tubular element 18.
  • the block 11 further includes a bore 11a, in that side wall penetrated by the tubular element 18, and a sesor, comprising a reed switch 23 is supported in the bore 11a by a rod 24 with a nut 25 on its upper regions, and by which the depth of the reed switch 23 can be adjusted within the bore 24.
  • the electrical connections 26 and 27 for the reed switch 23 extends through an axial bore in the rod 24 and extends out of the rod 24, above nuts 25, for connection to an electrical circuit to be described hereinafter.
  • the closure member 17 may comprise a permanent magnet but in the illustrated embodiment said member
  • ' is constructed from a non ferrous material and support a permanent magnet 28.
  • the magnet 28 is so selected that when the closure member 17 is in engagement with the tubular element 18, constituting a no-flow condition, the reed switch 23 is closed
  • the reed switch 23 With the closure member 17 abutting the tubular element 18 the detector device is in a no-flow condition, the reed switch 23 is closed and the electrical circuit, completed by the reed switch 23, can actuate display means (not shown) to indicate that the device is in a no-flow condition.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

Détecteurs d'écoulement capables de détecter des débits relativement faibles. Globalement le détecteur comprend une chambre d'écoulement (12) dotée d'un élément de fermeture allongé (17), de section transversale sensiblement uniforme, supporté pivotant dans ladite chambre (12). L'axe pivotant destiné à l'élément (17) se trouve au-dessus du centre de gravité dudit élément (17). En position de non-écoulement, l'élément (17) pend de manière sensiblement verticale afin de fermer l'extrémité d'une arrivée de fluide (18). La chambre d'écoulement a une configuration telle que dans la majeure partie du déplacement de l'élément de fermeture (17), à partir d'une position de non écoulement jusqu'une position de plein écoulement, le passage d'écoulement allant de l'arrivée (18) à la sortie (2) se trouve autour de l'élément (17), ledit passage d'écoulement ayant une section transversale sensiblement constante. Dans un mode préféré de réalisation, un réseau de détecteurs (23a à 23d) détecte la position de l'élément de fermeture (17) à l'intérieur de la chambre.
PCT/GB1988/000698 1987-08-28 1988-08-25 Detecteur d'ecoulement WO1989002065A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878720412A GB8720412D0 (en) 1987-08-28 1987-08-28 Flow detectors
GB8720412 1987-08-28

Publications (1)

Publication Number Publication Date
WO1989002065A1 true WO1989002065A1 (fr) 1989-03-09

Family

ID=10623014

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1988/000698 WO1989002065A1 (fr) 1987-08-28 1988-08-25 Detecteur d'ecoulement

Country Status (3)

Country Link
AU (1) AU2305288A (fr)
GB (1) GB8720412D0 (fr)
WO (1) WO1989002065A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991011140A1 (fr) * 1990-01-23 1991-08-08 Ferraris Development & Engineering Company Limited Appareil a ventilation servant a mesurer les cretes d'un flux d'air expiratoire
GB2238664B (en) * 1989-12-02 1994-06-22 Powered Showers Plc Flow switch assembly
EP1324011A2 (fr) * 2001-12-20 2003-07-02 Itt Manufacturing Enterprises, Inc. Appareil pour détecter la présence d'écoulement d'un liquide
CN103941303A (zh) * 2014-03-14 2014-07-23 格力电器（武汉）有限公司 微风检测装置
US8800473B1 (en) * 2010-08-06 2014-08-12 Richard DeVerse Mass velocity sensor device and method for remote monitoring and visual verification of fluid velocity
FR3062206A1 (fr) * 2017-01-21 2018-07-27 Christian Marreiro Dispositif et procédé de mesure de débit et volume d’écoulement de fluides par clapet à battant articulé.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1103119A (en) * 1964-08-20 1968-02-14 Walter Douglass Flow indicators
US3653260A (en) * 1968-12-23 1972-04-04 Grant V W Roth Flow indicator
US3857277A (en) * 1972-12-29 1974-12-31 Laval Turbine Flow indicator
JPS59196421A (ja) * 1983-04-22 1984-11-07 Taketo Kobayashi 流動状態監視装置
DE3330450A1 (de) * 1983-08-24 1985-03-14 Agfa-Gevaert Ag, 5090 Leverkusen Durchflussanzeige- oder -messvorrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1103119A (en) * 1964-08-20 1968-02-14 Walter Douglass Flow indicators
US3653260A (en) * 1968-12-23 1972-04-04 Grant V W Roth Flow indicator
US3857277A (en) * 1972-12-29 1974-12-31 Laval Turbine Flow indicator
JPS59196421A (ja) * 1983-04-22 1984-11-07 Taketo Kobayashi 流動状態監視装置
DE3330450A1 (de) * 1983-08-24 1985-03-14 Agfa-Gevaert Ag, 5090 Leverkusen Durchflussanzeige- oder -messvorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Vol. 9, No. 62, (P-342); & JP,A,59 196 421 (7 November 1984). *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2238664B (en) * 1989-12-02 1994-06-22 Powered Showers Plc Flow switch assembly
WO1991011140A1 (fr) * 1990-01-23 1991-08-08 Ferraris Development & Engineering Company Limited Appareil a ventilation servant a mesurer les cretes d'un flux d'air expiratoire
US5253651A (en) * 1990-01-23 1993-10-19 Ferraris Development And Engineering Company Limited Ventilatory instrument for measuring peak expiratory flow
AU646010B2 (en) * 1990-01-23 1994-02-03 Ferraris Development & Engineering Company Limited Ventilatory instrument for measuring peak expiratory flow
EP1324011A2 (fr) * 2001-12-20 2003-07-02 Itt Manufacturing Enterprises, Inc. Appareil pour détecter la présence d'écoulement d'un liquide
EP1324011A3 (fr) * 2001-12-20 2003-11-05 Itt Manufacturing Enterprises, Inc. Appareil pour détecter la présence d'écoulement d'un liquide
US8800473B1 (en) * 2010-08-06 2014-08-12 Richard DeVerse Mass velocity sensor device and method for remote monitoring and visual verification of fluid velocity
US20140345516A1 (en) * 2010-08-06 2014-11-27 Fluidics Hawaii, Llc Mass velocity sensor device and method for remote monitoring and visual verification of fluid velocity
CN103941303A (zh) * 2014-03-14 2014-07-23 格力电器（武汉）有限公司 微风检测装置
FR3062206A1 (fr) * 2017-01-21 2018-07-27 Christian Marreiro Dispositif et procédé de mesure de débit et volume d’écoulement de fluides par clapet à battant articulé.

Also Published As

Publication number Publication date
AU2305288A (en) 1989-03-31
GB8720412D0 (en) 1987-10-07

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