WO1998036245A1 - Dispositif pour indiquer le debit d'un fluide a l'interieur d'un conduit - Google Patents

Dispositif pour indiquer le debit d'un fluide a l'interieur d'un conduit Download PDF

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Publication number
WO1998036245A1
WO1998036245A1 PCT/AU1998/000082 AU9800082W WO9836245A1 WO 1998036245 A1 WO1998036245 A1 WO 1998036245A1 AU 9800082 W AU9800082 W AU 9800082W WO 9836245 A1 WO9836245 A1 WO 9836245A1
Authority
WO
WIPO (PCT)
Prior art keywords
flap
conduit
magnet
rest position
fluid
Prior art date
Application number
PCT/AU1998/000082
Other languages
English (en)
Inventor
Barton John Kenyon
Original Assignee
Resmed 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 Resmed Limited filed Critical Resmed Limited
Priority to AU59731/98A priority Critical patent/AU5973198A/en
Publication of WO1998036245A1 publication Critical patent/WO1998036245A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • F16K31/08—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet
    • F16K31/084—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid using a permanent magnet the magnet being used only as a holding element to maintain the valve in a specific position, e.g. check valves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/08—Bellows; Connecting tubes ; Water traps; Patient circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0025—Electrical or magnetic means
    • F16K37/0041—Electrical or magnetic means for measuring valve parameters
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
    • A61M2016/003—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter
    • A61M2016/0033—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter electrical
    • A61M2016/0036—Accessories therefor, e.g. sensors, vibrators, negative pressure with a flowmeter electrical in the breathing tube and used in both inspiratory and expiratory phase

Definitions

  • the present invention relates to an apparatus for indicating the flow rate of a fluid through a conduit.
  • the invention has been developed primarily for use in indicating the flow rate of air (or breathable gas) supplied to a patient undergoing continuous positive airway pressure (CPAP) treatment for obstructive sleep apnea.
  • CPAP continuous positive airway pressure
  • the pressure of the gas supplied to the patient is bi-level (in synchronism with patient inspiration and expiration) or auto setting in level, the flow rate of the supplied air is required by a control system for triggering purposes.
  • the invention is also suited for many other flow rate indicating or measuring applications.
  • An example is the monitoring, for diagnostic purposes, of the respiratory flow rate of a patient.
  • a known method of measuring the flow rate of a fluid (liquid or gas) through a conduit involves measuring the pressure either side of a restriction of constant area in the conduit. If the pressure drop across the restriction is recorded for a variety of known flow rates then the function of the flow rate with respect to the pressure drop can be determined.
  • the flow rate is basically related to the pressure drop by a quadratic function (ie. the pressure drop is proportional to the square of the flow rate).
  • the function is known then, by measuring the pressure drop, it is possible to calculate the corresponding flow rate.
  • the pressure drop can be measured by an electronic differential pressure transducer which provides an electrical signal indicative of the pressure drop to a conversion unit in the control system for converting the signal into a flow rate.
  • variable area restriction includes a resilient plastic flap that, in an unstressed
  • the flap deflects to enlarge the permitted flow area of the conduit under the influence of the fluid flowing through the restriction.
  • the higher the air flow the more the flap deflects, and the larger the restriction area becomes.
  • the resilient flap can be configured to provide an almost linear relationship between pressure drop and flow rate over a useful range of flows. In ⁇ o this way, the resilient flap provides the desired level of accuracy at both relatively low and high flows. Further, as the area of the restriction is increased at high flows, the resilient flap does not cause a large pressure drop at these high flows.
  • the resilient flap suffers from the disadvantage that, after continuous use, it can take on a permanently deflected set and therefore provide erroneous or
  • the present invention discloses an apparatus for indicating the flow rate of a fluid through a conduit, the apparatus including: a flap mounted in said conduit, said flap being off-centre pivotally mounted to pivot in response to the flow of
  • biasing means associated with the flap to rotationally urge the flap against the action of the flow; and means to sense the position of the flap and issue a signal indicative of the flap position, wherein the flap position signal is indicative of the flow rate of the fluid through the conduit.
  • the biasing means preferably urges said flap to a rest position when no fluid is
  • the flap preferably substantially occludes the conduit in the rest position.
  • the flap is also preferably substantially perpendicular to the general direction of fluid flow through the conduit when in the rest position.
  • the flap progressively pivots to progressively increase the flow area of the conduit in response to increasing fluid flow therethrough.
  • the biasing means takes the form of a magnet mounted on the flap which, in the rest position, is positioned between one or more, preferably two, magnets mounted on the conduit remote from the flap magnet.
  • the flap is mounted on a pivotable shaft and the biasing means includes a flap magnet eccentrically mounted on the shaft, the flap magnet, in the rest position, being positioned between at least two magnets mounted on the conduit remote the flap magnet.
  • the shaft passes through a wall of the conduit and the flap magnet is mounted exterior the conduit.
  • the conduit magnets are preferably symmetrically mounted either side of the flap magnet.
  • the flap magnet and the conduit magnets are preferably adapted to provide a repelling force therebetween to urge the flap to the rest position.
  • an attracting magnet is placed on the conduit adjacent the flap magnet, when the flap is in the rest position, to therefore attract the flap magnet and urge the flap into the rest position.
  • a ferro-magnetic metal such as steel, is placed on the flap and is attracted by the conduit magnet to bias the flap to the rest position.
  • a ferro-magnetic metal can be placed on the conduit and a flap magnet used to attract the flap into the rest position.
  • a spring for example, a clock spring, has one end attached to the flap and the other end attached to the conduit to urge the flap to the rest position.
  • gravity can be used to urge the flap to the rest position.
  • a weight is preferably placed on the portion of the flap below the hinge axis.
  • the portion of the flap below the hinge axis is preferably configured to be larger and thereby heavier than that above.
  • the flap position sensing means is preferably one or more continuous output Hall Effect sensors mounted on or adjacent the conduit and adapted to issue an output signal in response to their distance from a magnet disposed on the flap.
  • the magnet associated with the Hall Effect sensor(s) is desirably also used to provide the biasing force in combination with either conduit magnets or ferro- magnetic material mounted on the conduit.
  • the magnet associated with the Hall Effect sensors is disposed remote from any magnets or metal associated with the biasing means.
  • two Hall Effect sensors are each arranged either side of the flap rest position and the difference in their signals used to indicate the flap position.
  • the flap position sensing means is a linearly variable differential transformer having a first and second part adapted for relative rotation therebetween wherein the output signal of the transformer is indicative of flap position.
  • one of the first or second parts is non-rotatably mounted to the flap and the other of the first or second parts is non-rotatably mounted to the conduit.
  • the flap position sensing means includes a light source and a photodetector each arranged either side of the flap, wherein flap rotation alters the amount of light passing the flap and incident on the photodetector which thereby issues a signal indicative of flap position.
  • an optically encoded disc is attached to the flap having for example a rotary Grey scale and an optical sensor is mounted on or adjacent the conduit and adapted to recognise regions of the scale and thereby indicate the amount of rotation or position of the flap.
  • Fig. 1 is a cross-sectional side view of a first embodiment
  • Fig. 2 is a cross-sectional end view along line 2-2 of the embodiment shown in Fig. 1
  • Fig. 3 is a side view of the embodiment shown in Fig. 1 under the influence of a relatively low flow rate
  • Fig. 4 is a side view of the embodiment shown in Fig. 1 under the influence of a relatively high flow rate
  • Fig. 5 is a plot of the relationship between the flow rate of the fluid in the conduit and the output voltage of the differential amplifier connected to the Hall Effect sensors of the embodiment shown in Fig. 1 ;
  • Fig. 6 is a top view of a second embodiment
  • Fig. 7 is a bottom view of the embodiment of Fig. 6
  • Fig. 8 is a rear perspective view of the embodiment of Fig. 6
  • Fig. 9 is a top perspective view of the embodiment of Fig. 6;
  • Fig. 10 is an exploded view of the embodiment shown in Fig. 6;
  • Fig. 11 is a side view of the embodiment of Fig. 6;
  • Fig. 12 is a plot of the relationship between the flow rate of fluid (air) in the conduit and the output voltage of the differential amplifier connected to the Hall Effect sensors of the embodiment of Fig. 6;
  • Fig. 13 is a side view of a third embodiment
  • Fig. 14 is a side view of a fourth embodiment
  • Fig. 15 is a side view of a fifth embodiment
  • Fig. 16 is a diagrammatical end view of the embodiment shown in Fig. 1 ;
  • Fig. 17 is a diagrammatical end view of a sixth embodiment;
  • Fig. 18 is a diagrammatical end view of a seventh embodiment
  • Fig. 19 is a diagrammatical side view of an eighth embodiment
  • Fig. 20 is an end view of the embodiment of Fig. 19. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • FIGs. 1 and 2 there is shown a first embodiment of an apparatus 10 for indicating the flow rate of a fluid F through a conduit 12.
  • the apparatus 10 includes a substantially rigid flap 14 which is mounted for off-centre
  • the flap has two pivot shafts 17 that each terminate in a relatively sharp cone 18.
  • the pivot shafts 17 are received within two pivot bores 20 which each terminate in a relatively wide cone 22 to provide point contact of low friction between each of the pivot shafts 17 and the associated pivot bores 20.
  • the apparatus 10 also includes biasing means in the form of magnet 24 mounted on the flap 14 and magnets 26 mounted on the conduit 12 either side of the flap magnet 24.
  • the magnets 24 and 26 are preferably fabricated from Neodymium Iron Boron or Samarium Cobalt type material.
  • the conduit magnets 26 are oriented so that they each repel the flap magnet 24 and thereby urge the flap to the position shown
  • the flap 14 has a relatively large area 28 and a relatively small area 30 either side of the pivot axis 16. Accordingly, when fluid flow F is occurring in the conduit 12 the flap 14 is forced to pivot in the direction of arrow 32 (see Figs. 6 and 7) about
  • the apparatus 10 also includes means to sense the position of the flap 14 and
  • the Hall Effect sensors 36 are mounted on the conduit 12 and issue an output signal along connecting wires 38 indicative of the distance between the flap magnet 24 and each of the Hall Effect sensors 36.
  • the output signals travel along the wires 38 to a differential amplifier (not shown) which issues a voltage indicative of
  • Fig. 3 shows the flap 14 rotated to a position ⁇ L in response to the flow of fluid F L .
  • the force on the flap 14 in the direction of arrow 32 is balanced by the repelling force provided by the magnets 24 and 26 in the direction of the arrow 34.
  • Fig. 4 shows the flap 14 under the influence of a higher flow of fluid F H where the flap 14 is rotated to position ⁇ H . Accordingly, the higher the flow rate F of the fluid through the conduit 12, the more the flap 14 pivots away from the rest position.
  • the Hall Effect sensor 36 upstream of the flap 14 will issue a larger signal than the downstream Hall Effect sensor 36.
  • the output signal provided by the Hall Effect sensors 36 is inversely proportional to the square of the distance between the flap magnet 24 and the Hall Effect sensor 36.
  • the apparatus 10 provides extremely desirable output characteristics as, in the lower flow rates, for example below 20 litres per minute, a relatively steep linear relationship exists between flow rate and output signal voltage which provides a higher level of accuracy at this lower range.
  • Figs. 6 to 11 show a second embodiment of an apparatus 50 for indicating the flow rate of a fluid F through a conduit 12.
  • the apparatus 50 includes a housing 51 having two housing halves 52 and 54 which are held together by clamps 56 to define a right-angled section of conduit 12 having open ends 58 and 60.
  • the aluminium flap 14 is mounted adjacent one edge to a vertical shaft 62 which has ends protruding through both of the housing halves 52, 54.
  • a first flap magnet 24a is eccentrically mounted to one end of the shaft 62 external the conduit 14.
  • the flap magnet 24a is repelled by the conduit magnets 26 mounted within circular recesses 55. The repulsion between the magnets 24 and 26 biases the flap 14 to the
  • the other end of the shaft 62 also includes an external eccentrically mounted second flap magnet 24b.
  • the magnet 24b pivots between the Hall Effect sensors 36 mounted on a printed circuit board 66.
  • the housing half 54 includes boss 68 and recessed lug 70 to locate the housing 51 with respect to the board 66 and thus position
  • the Hall Effect sensors 36 each produce a voltage output which is supplied to respective inputs of a differential amplifier whose output is supplied to an analogue to digital (a-d) converter having an a-d count output.
  • Fig. 12 shows a plot of a-d output (counts) over a range of air flow rates (litres/min).
  • the housing halves 52, 54 each also include a dampening magnet 72 disposed to attract each other.
  • a steel yoke 74 closes the magnetic field therebetween.
  • the flap 14 includes a radial fin 76 extending partially around the shaft 62, as best shown in Fig. 10.
  • the fin 76 is positioned between the facing poles of the dampening magnets 72 and, as the flap 14 pivots, the fin 76 moves through the magnets' magnetic field and creates eddy currents.
  • the eddy currents produce their own magnetic field which opposes the movement of the fin 76 and dampens oscillation in the flap 14.
  • the fin 76 is constructed of a conductive, non ferro-magnetic material such as Aluminium.
  • Fig. 13 shows a third embodiment of a flow indicating apparatus 80, similar to the second embodiment, but in which the position of the flap 14 and corresponding rotation of the shaft 62 is directly measured by a linearly variable differential transformer 82 connected to the shaft 62.
  • Fig. 14 shows a fourth embodiment of a flow indicating apparatus 90 in which the position of the flap 14 and corresponding rotation of an optically encoded disc 92 mounted on the shaft 62 is sensed by an optical sensor 94.
  • the disc 92 can have a rotary Grey scale thereon.
  • Fig. 15 shows a fifth embodiment of a flow indicating apparatus 100 in which the position of the flap 14 is measured by sensing the amount of light from a light source 102 that is incident on a photodetector 104.
  • the corner 106 includes a transparent portion 108 to permit the light to enter the conduit 12.
  • Fig. 16 is a diagrammatical representation of the flap 14 within the conduit 12 of the first embodiment.
  • Fig. 17 is a diagrammatical representation of a sixth embodiment having an irregular shaped flap 110 provided within a correspondingly shaped conduit 112 to exemplify that the flap 110 and the conduit 112 can be of many different shapes.
  • Fig. 18 is a diagrammatical representation of a seventh embodiment having a flap 120 which pivots about the horizontal axis 16 near the upper edge 122 of the flap
  • the off-centre pivot axis can be placed at different positions in the flap 120. Further, in this embodiment, gravity alone, or with the assistance of a weight
  • Figs. 19 and 20 show an eighth embodiment 130 in which a flap magnet 132 is used to attract a conduit magnet 134 to bias the flap 14 to the rest position shown.
  • one of the flap magnet or the conduit magnet can be replaced by ferro- magnetic metal.
  • the flap 14 substantially occludes the cross sectional area of the conduit 12 in the rest position. This is a preferred configuration only and in other embodiments (not shown) the flap 14 only partially occludes the conduit when in the rest position. Similarly, in the embodiment of Fig. 1 the flap 14, in the rest position, is substantially perpendicular to the direction of fluid flow F through the conduit 12. This is also a preferred configuration and in other embodiments (not shown) the flap 14 is angled with respect to the flow direction at the rest position.
  • the apparatus 10 as shown in Fig. 1, is inherently damped due to the drag of the flap 14 as it rotates. Drag between the flap 14 and the fluid tends to resist rotation of the flap 14 and increases with fast rotations thereby providing true damping. The damping effect is more pronounced with denser fluids. Further, if flap size is increased then more drag and thereby more damping is created. ⁇ o The movement of the flap 14 can also be damped by providing friction between the pivot shafts 17 and the pivot bores 20.
  • the apparatus' described above possess the previously described advantages over the fixed area restriction as they function in the manner of a variable area restriction. Further, the apparatus' are they also advantageous over the flexible flap i s restriction previously described as the pivotable flap cannot take on a permanent deflection or set through constant use thereby increasing the accuracy of the apparatus' when indicating flow rate. Also, the function between the flow rate and the output signals of the Hall Effect sensors can be altered to provide other desired relationships by varying the flap size, shape, pivot axis or the force of the biasing means.
  • the function tends to an asymptote of substantially constant output voltage. Additionally, by comparing the output signals of the upstream and downstream Hall Effect sensors the apparatus can also provide an indication of flow direction.
  • the apparatus' are relatively inexpensive as they avoid the use of
  • the apparatus' is important.
  • the apparatus' can be configured so that the only materials in contact with the fluid are those of the flap and the conduit. If magnets or ferro-magnetic material are fitted to the flap, then they can be fitted inside the flap and fully encased by the material from which the flap is produced.
  • Embodiments of the apparatus' also provide good signal sensitivity at low
  • the apparatus' are more thermally stable than devices using differential pressure transducer as such devices commonly use thermal elements which do not compensate ambient temperature variations very accurately.
  • the apparatus' also have a large and accurate measurement range compared to prior art devices. More particularly, the apparams' exhibit high accuracy at low flow rates and slightly lower, but acceptable, accuracy at large flow rates.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Emergency Medicine (AREA)
  • Anesthesiology (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Pulmonology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • General Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

Un dispositif (10), permettant d'indiquer le débit d'un fluide (F) à l'intérieur d'un conduit (12), comprend un volet (14) monté à l'intérieur dudit conduit (12), qui est fixé pivotant décentré de façon à pivoter en réponse à l'écoulement d'un fluide (F) dans ledit conduit (12). Un système de sollicitation (24, 26) associé au volet (14) fait pivoter ce dernier de façon à le pousser contre l'action du flux (F). Un système (36) destiné à détecter la position du volet (14) émet un signal qui indique la position dudit volet. Le signal de position du volet indique le débit du fluide (F) à l'intérieur du conduit (12).
PCT/AU1998/000082 1997-02-14 1998-02-13 Dispositif pour indiquer le debit d'un fluide a l'interieur d'un conduit WO1998036245A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU59731/98A AU5973198A (en) 1997-02-14 1998-02-13 An apparatus for indicating the flow rate of a fluid through a conduit

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPO5114 1997-02-14
AUPO5114A AUPO511497A0 (en) 1997-02-14 1997-02-14 An apparatus for indicating the flow rate of a fluid through a conduit

Publications (1)

Publication Number Publication Date
WO1998036245A1 true WO1998036245A1 (fr) 1998-08-20

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PCT/AU1998/000082 WO1998036245A1 (fr) 1997-02-14 1998-02-13 Dispositif pour indiquer le debit d'un fluide a l'interieur d'un conduit

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AU (1) AUPO511497A0 (fr)
WO (1) WO1998036245A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001094822A1 (fr) * 2000-06-09 2001-12-13 Kil Bong Song Dispositif de vanne automatique
WO2002040914A2 (fr) * 2000-11-17 2002-05-23 Controlink, Llc. Robinet a poignee intelligente
WO2003050923A1 (fr) * 2001-12-11 2003-06-19 Mss Power Systems Pty Ltd Appareil de sertissage hydraulique
WO2003063937A1 (fr) 2002-01-28 2003-08-07 Pari GmbH Spezialisten für effektive Inhalation Dispositif de mesure de debit respiratoire
EP2481702A1 (fr) * 2011-02-01 2012-08-01 Atuser SARL Dispositif de pompage d'un fluide, notamment d'un fluide visqueux
WO2014161099A1 (fr) * 2013-04-02 2014-10-09 Medela Holding Ag Dispositif doté d'un conduit d'écoulement
US9974911B2 (en) 1996-09-23 2018-05-22 Resmed Limited Method and apparatus for providing ventilatory assistance
KR102241747B1 (ko) * 2021-01-11 2021-04-16 안용관 IoT 통신기능을 가진 부단수 물방향 표시장치
CN114184514A (zh) * 2022-02-15 2022-03-15 山东省煤田地质局第五勘探队 一种露天水源勘测系统及方法
WO2023214046A1 (fr) * 2022-05-06 2023-11-09 Coroflo Limited Débitmètre cible compact

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US3992598A (en) * 1974-12-04 1976-11-16 Afton Incorporated Airflow velocity switch
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US4530334A (en) * 1982-12-09 1985-07-23 Solex (U.K.) Limited Air flow metering
GB2205167A (en) * 1987-05-23 1988-11-30 Ronald James Care Universal flow sensor
US5183983A (en) * 1992-03-20 1993-02-02 Dwyer Instruments, Inc. Flow switch assembly for fluid flow monitoring
US5305787A (en) * 1993-02-03 1994-04-26 C & S Valve Company Disk valve with improved disk mounting

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US3992598A (en) * 1974-12-04 1976-11-16 Afton Incorporated Airflow velocity switch
US4301833A (en) * 1979-10-05 1981-11-24 Donald Iii Robert A Flow responsive safety valve
US4530334A (en) * 1982-12-09 1985-07-23 Solex (U.K.) Limited Air flow metering
GB2205167A (en) * 1987-05-23 1988-11-30 Ronald James Care Universal flow sensor
US5183983A (en) * 1992-03-20 1993-02-02 Dwyer Instruments, Inc. Flow switch assembly for fluid flow monitoring
US5305787A (en) * 1993-02-03 1994-04-26 C & S Valve Company Disk valve with improved disk mounting

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Title
PATENT ABSTRACTS OF JAPAN, Vol. 96, No. 2; & JP,A,07 280 609 (TAIYO VALVE SEISAKUSHO KK) 27 October 1995. *

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9974911B2 (en) 1996-09-23 2018-05-22 Resmed Limited Method and apparatus for providing ventilatory assistance
WO2001094822A1 (fr) * 2000-06-09 2001-12-13 Kil Bong Song Dispositif de vanne automatique
WO2002040914A2 (fr) * 2000-11-17 2002-05-23 Controlink, Llc. Robinet a poignee intelligente
WO2002040914A3 (fr) * 2000-11-17 2003-04-24 Mark Peters Robinet a poignee intelligente
US7114510B2 (en) 2000-11-17 2006-10-03 Ino Therapeutics, Inc. Valve with smart handle
WO2003050923A1 (fr) * 2001-12-11 2003-06-19 Mss Power Systems Pty Ltd Appareil de sertissage hydraulique
WO2003063937A1 (fr) 2002-01-28 2003-08-07 Pari GmbH Spezialisten für effektive Inhalation Dispositif de mesure de debit respiratoire
DE10203079A1 (de) * 2002-01-28 2003-08-21 Pari Gmbh Atemflussmessvorrichtung
EP2481702A1 (fr) * 2011-02-01 2012-08-01 Atuser SARL Dispositif de pompage d'un fluide, notamment d'un fluide visqueux
FR2970959A1 (fr) * 2011-02-01 2012-08-03 Atuser Sarl Dispositif de pompage d'un fluide, notamment un fluide visqueux
CH707857A1 (de) * 2013-04-02 2014-10-15 Medela Holding Ag Vorrichtung mit einem Durchflusskanal.
CN105228667A (zh) * 2013-04-02 2016-01-06 美德乐控股公司 具有流动通道的设备
US9770542B2 (en) 2013-04-02 2017-09-26 Medela Holding Ag Device having a flow channel, a nonreturn valve, and a flow detector that detects a position of the nonreturn valve
AU2014247665B2 (en) * 2013-04-02 2018-03-29 Medela Holding Ag Device having a flow channel
WO2014161099A1 (fr) * 2013-04-02 2014-10-09 Medela Holding Ag Dispositif doté d'un conduit d'écoulement
TWI633897B (zh) * 2013-04-02 2018-09-01 瑞士商米黛拉控股公司 具有流動通道的裝置
KR102241747B1 (ko) * 2021-01-11 2021-04-16 안용관 IoT 통신기능을 가진 부단수 물방향 표시장치
CN114184514A (zh) * 2022-02-15 2022-03-15 山东省煤田地质局第五勘探队 一种露天水源勘测系统及方法
CN114184514B (zh) * 2022-02-15 2022-05-10 山东省煤田地质局第五勘探队 一种露天水源勘测系统及方法
WO2023214046A1 (fr) * 2022-05-06 2023-11-09 Coroflo Limited Débitmètre cible compact

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