WO2000014490A1 - Debitmetre - Google Patents

Debitmetre Download PDF

Info

Publication number
WO2000014490A1
WO2000014490A1 PCT/DK1999/000454 DK9900454W WO0014490A1 WO 2000014490 A1 WO2000014490 A1 WO 2000014490A1 DK 9900454 W DK9900454 W DK 9900454W WO 0014490 A1 WO0014490 A1 WO 0014490A1
Authority
WO
WIPO (PCT)
Prior art keywords
flowmeter according
separating wall
cleaning
measuring rotor
cleaning element
Prior art date
Application number
PCT/DK1999/000454
Other languages
English (en)
Inventor
Jørgen Seindal WIWE
Jørgen SEERUP
Arne Markvart
Jan S. Harling
Original Assignee
Danfoss A/S
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 Danfoss A/S filed Critical Danfoss A/S
Priority to AU52795/99A priority Critical patent/AU5279599A/en
Publication of WO2000014490A1 publication Critical patent/WO2000014490A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F7/00—Volume-flow measuring devices with two or more measuring ranges; Compound meters
    • 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
    • G01F1/06—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 using rotating vanes with tangential admission
    • G01F1/065—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 using rotating vanes with tangential admission with radiation as transfer means to the indicating device, e.g. light transmission
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/12—Cleaning arrangements; Filters

Definitions

  • the invention concerns a flowmeter with a housing having a measuring rotor with markings, arranged in a flow pipe, and an optic scanner, producing scanning signals in dependence of the markings registered, a transparent separating wall being arranged between measuring rotor and scanner.
  • Such flowmeters are particularly meant for the detection of a fluid flow.
  • They serve the purpose of water consumption measuring or the detection of leakages in a piping.
  • the markings act upon a light beam, for example by reflection or interruption, transmitted by an opto-electric transmitter, for example a light emission diode, so that scanning signals, whose frequency is a measure for the volume flow measured, are transmitted by an opto-electrical receiver, for example a photo cell or a photo resistor.
  • the separating wall ensures that the opto- electrical parts are not getting in touch with the fluid to be measured to ensure proper operation.
  • the response sensitivity of such opto-electrical scanners deteriorate over the time, so that from time to time the energising current of the transmitter must be increased, or the transmitter can be operated with this higher current right from the beginning.
  • the task of the invention is to provide a flowmeter as described in the introduction, which can be operated for a longer period with lower power.
  • this task is solved in that the side of the separating wall facing the measuring rotor is provided with at least one cleaning element, the clean- ing element and the separating wall being displaceable in relation to each other.
  • This proposal is based on the consideration that a major share of the output drop of the optic scanner is caused by an impurification, particularly a calcification , on the inside of the separating wall. If this impurification is removed by the cleaning element at regular intervals, a minimum energising current for the optical transmitter will be sufficient for long periods. This is particularly interesting, when only battery supply is available for the optical scanning and the evaluation of the measuring results .
  • the cleaning element bears resiliently on the separating wall.
  • the surface of the wall is submitted to a certain pressure, which promotes the removal of impurities.
  • the cleaning element is arranged on a carrier, which is axially displaceable by means of a pin led to the outside through a sealing.
  • the cleaning process can easily be initiated from the outside.
  • the housing carries an element with an operating motor for displacing the pin. This facilitates the cleaning process.
  • the flowmeter can also be fitted in less easily accessible surroundings.
  • a constructively simple solution involves that the operating motor displaces a stop and the carrier is loaded by a spring, which holds the pin against the stop.
  • the pin and also the carrier for the cleaning element follow the stop, which is displaceable by the operating motor.
  • the cleaning device cleans additional parts of the flow pipe.
  • a preferred embodiment involves that the measuring rotor is an impeller wheel, which receives fluid via an orifice, and that the orifice can be cleaned by a cleaning element of the cleaning device.
  • the orifice can be cleaned by a cleaning element of the cleaning device.
  • the orifice is made of a resilient material and is deformed by the cleaning element .
  • the measuring rotor is ar- ranged in the movable valve element of a lifting valve, that both separating wall, transmitter and receiver are fixed on the housing, and that the cleaning process is initiated in dependence of the closing movement of the lifting valve.
  • utilising the closing movement involves an additional simplification.
  • Fig. 1 a three-dimensional, partial view of a leakage detector with a flowmeter according to the invention
  • Fig. 2 a longitudinal section through the leakage de- tector in Fig. 1
  • Fig. 3 a cross section through the leakage detector in
  • the leakage detector has a housing 1, having an inlet connector 2 and an outlet connector 3, each with an internal thread, for building into a pipe of a piping to be monitored.
  • An element 4 is fixed on the housing 1 by means of the nut 5 with external thread.
  • the element has a cover 6 and a rotary knob 7 projecting towards the outside.
  • an insert 10 is mounted using two sealing rings 8 and 9, which insert has an upper wall 11 for limiting an inlet chamber 12 and a lower wall 13 for separating an outlet chamber 14 from the inlet chamber 12 and for forming the valve seat 15 of a lifting valve 16.
  • the valve seat 15 is formed by an annular slot 17, which is connected with the inlet chamber 12 via bores 18.
  • the locking piece is a movable valve element 19 provided with a sealing ring, which valve element is loaded by a first, weaker closing spring 20 against the flow direction, and - as will be explained in detail later - which can be loaded by a second, stronger closing spring 21.
  • a main flow path 22 extends between the inlet cham- ber 12 and the outlet chamber 14, which path comprises the bores 18, the annular slot 17 and the lifting valve 16.
  • a measuring rotor 23 in the shape of an impeller wheel is supported in the movable valve element 19. It is fed with fluid via an orifice 24 arranged on the insert 10, which fluid can flow off through a channel 25 in the movable valve element 19. This gives an auxiliary flow path 26 between the inlet chamber 12 and the outlet chamber 14, which path comprises the orifice 24, the measuring rotor
  • the measuring rotor 23 is part of a flowmeter 27 having an optic scanning device 28.
  • This device comprises an electro-optic transmitter 29, for example a light-emission diode, and on the opposite side of the measuring rotor 23 an electro-optic receiver 30, for example a photocell, a photo transistor or a photo resistor.
  • Transmitter and receiver are separated from the fluid carrying chamber by means of transparent separating walls 31 and 32, and thus are mounted in protected surroundings.
  • the separating walls 31, 32 can be made in one piece with the insert 10, provided that it is made completely of a trans- parent material.
  • the impellers of the measuring rotor 23, extending radially with constant thickness, form markings 33, which temporarily interrupt the light beam transmitted by the transmitter 29, so that a pulse-shaped scanning signal occurs.
  • the measuring rotor 23 can have very small dimensions, for example a diameter of 15 mm and a width of 1 mm.
  • a carrier 34 projects through openings in the movable valve element 19 by means of a counter flange 35, the second closing spring 21 being made inactive.
  • the carrier 34 bears with an end stop 36 on a pin 37 extending sealingly outwards, which pin again is brought to bear on an end stop 38 on an adjusting element 39 by the force of the closing spring 21.
  • a displacement of the adjusting element 39 in the outwards direction brings the carrier 34 to a second position, in which the second closing spring 21 acts upon the movable valve element 19.
  • two cleaning elements 40 and 41 are connected with the carrier 34, which elements bear flexibly with a cleaning edge on the separating walls 31 and 32, respectively, and, on displacement of the carrier 34 cleans the working area of the optic scanning device 28 of impurities, for example calcification.
  • a closing and cleaning element 42 is arranged on the carrier 34, which element closes the orifice 24 on the upward movement of the carrier 34, that is, blocks the auxiliary flow path 26.
  • the orifice 24 can be cleaned, either through a pin (not shown) in the closing and cleaning element 42 being pushed into the orifice opening, or through the flexible material of the orifice 24 being deformed by the closing and cleaning element 42, so that any impurities stuck in the orifice are set free.
  • a third spring can be provided, which presses the carrier 34 as far upwards as permitted by the end stop 38 on the adjusting element 39.
  • the element 4 comprises an evaluating and control circuit 43 supplied with the scanning signals, which circuit can, for example, be made on a printed circuit board 44, and an electrical battery 45.
  • An electronic operating motor 46 controlled by the evaluating and control circuit 43 is able to displace the adjusting element 39 axially via a gear 47.
  • the rotary knob 7 permits an auxiliary displacement via a cam 48.
  • a pressure sensor 49 can also be provided in the inlet chamber 12, whose measuring signal can also be supplied to the evaluating and control circuit 43.
  • the scanning signals of the scanning device 28 are evaluated in two ways. Due to their frequency, which corresponds to the speed of the measuring rotor 23, the volume flow in the auxiliary flow path 26 is registered. Due to the pulse-pause relation, which increases with increasing - 1 - downwards motion of the lifting valve 16, caused by the constant thickness of the impellers, the lift of the movable valve element 19 and thus the volume flow in the main flow path are calculated.
  • the total flow is registered by the flowmeter 27. Small volume flows can be measured very accurately. In this situation the pulse-pause relation is constant, whereas the frequency is proportional to the flow.
  • the lifting valve 16 opens, the resulting lift depending exclusively on the flow and on the characteristic of the first spring 20.
  • the lift is a direct measure for the flow through the main flow path 22.
  • the evaluating and control circuit 43 the total flow thus can be calculated by a conversion of the measured lift of the volume flow in the main flow path 22 added to the volume flow in the auxiliary flow path 26 registered by means of the flowmeter 27.
  • the device shown acts as blocking device, when the adjusting element 39 and thus the carrier 34 are moved upward, which only requires little motor power due to the load by the second closing spring 21.
  • the valve element is pushed with large force into the closed position.
  • the orifice 24 is closed by means of the closing and cleaning element 42.
  • main and auxiliary flow paths are blocked.
  • the same displacement of the carrier 34 can also be used to clean the separating walls 31 and 32 by means of the cleaning elements 40 and 41, and to clean the orifice 24 by inserting a pin in the orifice 24 opening and/or by squeezing the orifice 24. This can be made in dependence of time or of degree of impurification.
  • the movement of the carrier 34 over partial areas can be used to make a zero-point adjustment or to throttle the flow.
  • the latter serves the signal transmission to a consumer, who is tapping water, to persuade him to change or end the tapping.
  • the blocking procedure is initiated when a leakage occurs.
  • a small leakage for example, is assumed, when small volume flows appear, without reports from the pressure sensor 49 about changes in the supply pressure.
  • a large leakage is assumed when large volume flows appear and it is recognisable that no tapping- is going on, which is, for example, established in that a random throttling of the flow at the leakage detector is not responded by a change of the volume flow with the tapping consumer.
  • the field current of the opto-electrical transmitter 29 can be set at a minimum value, which is permissible due to the repeated cleaning processes, and the individual measurings of the leakage detection can be performed at larger intervals, for example 20 minutes.

Abstract

L'invention porte sur un débitmètre constitué d'un corps (1) à l'intérieur duquel sont placés un rotor (23) de mesurage doté de repères (33) et un scanner (28) numérique générant des signaux de balayage en fonction des repères (33) détectés. Une paroi (31, 32) de séparation transparente est placée entre le rotor (23) et le scanner (28). Sur un côté de la paroi (31, 32) de séparation opposée au rotor (23) de mesurage se trouve un dispositif de nettoyage pourvu d'au moins un élément (40, 41) de nettoyage, l'élément de nettoyage et la paroi de séparation pouvant se déplacer l'un par rapport à l'autre, ce qui permet de faire fonctionner le débitmètre sur une plus longue durée à une puissance réduite.
PCT/DK1999/000454 1998-09-02 1999-08-30 Debitmetre WO2000014490A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU52795/99A AU5279599A (en) 1998-09-02 1999-08-30 Flowmeter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998139954 DE19839954C1 (de) 1998-09-02 1998-09-02 Durchflußmesser
DE19839954.5 1998-09-02

Publications (1)

Publication Number Publication Date
WO2000014490A1 true WO2000014490A1 (fr) 2000-03-16

Family

ID=7879537

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1999/000454 WO2000014490A1 (fr) 1998-09-02 1999-08-30 Debitmetre

Country Status (3)

Country Link
AU (1) AU5279599A (fr)
DE (1) DE19839954C1 (fr)
WO (1) WO2000014490A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014149449A1 (fr) * 2013-03-15 2014-09-25 Abbott Medical Optics Inc. Système et procédé de détection de débit de phaco-émulsification

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021122630A1 (de) * 2021-09-01 2023-03-02 Binder Gmbh Reinigungsvorrichtung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1354816A (en) * 1920-10-05 Meter
US3813940A (en) * 1972-12-18 1974-06-04 Sperry Rand Corp Flow meter with a bypass
US5103757A (en) * 1991-02-19 1992-04-14 Dwyer Instruments, Inc. Self cleaning device for sight flow indicators

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2423604A (en) * 1944-06-12 1947-07-08 Claude M Mccord Wiper and valve for register box windows
CH261426A (de) * 1948-02-09 1949-05-15 Kunz Max Wassermesser mit trocken bleibendem Zifferblatt.
US2904815A (en) * 1957-01-28 1959-09-22 Carl J Mitchell Transparent meter dial guard wiper
JPS5520429A (en) * 1978-08-01 1980-02-13 Tokyo Tatsuno Co Ltd Self-sweep unit for flow meter
JPS6059526B2 (ja) * 1978-08-01 1985-12-25 株式会社東京タツノ コミなどの障害物が自動的に除去される流量計
JPH0464018A (ja) * 1990-07-04 1992-02-28 Taiyo Valve Seisakusho:Kk 透明体内面洗浄装置およびフローゲージ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1354816A (en) * 1920-10-05 Meter
US3813940A (en) * 1972-12-18 1974-06-04 Sperry Rand Corp Flow meter with a bypass
US5103757A (en) * 1991-02-19 1992-04-14 Dwyer Instruments, Inc. Self cleaning device for sight flow indicators

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014149449A1 (fr) * 2013-03-15 2014-09-25 Abbott Medical Optics Inc. Système et procédé de détection de débit de phaco-émulsification
US9597229B2 (en) 2013-03-15 2017-03-21 Abbott Medical Optics Inc. Phacoemulsification flow rate detection system and method
AU2014238172B2 (en) * 2013-03-15 2018-02-08 Johnson & Johnson Surgical Vision, Inc. Phacoemulsification flow rate detection system and method

Also Published As

Publication number Publication date
AU5279599A (en) 2000-03-27
DE19839954C1 (de) 2000-05-25

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