WO2006135301A1 - Appareil de mesure d’écoulement - Google Patents

Appareil de mesure d’écoulement Download PDF

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Publication number
WO2006135301A1
WO2006135301A1 PCT/SE2006/000608 SE2006000608W WO2006135301A1 WO 2006135301 A1 WO2006135301 A1 WO 2006135301A1 SE 2006000608 W SE2006000608 W SE 2006000608W WO 2006135301 A1 WO2006135301 A1 WO 2006135301A1
Authority
WO
WIPO (PCT)
Prior art keywords
float
compartment
liquid
outlet
sensor
Prior art date
Application number
PCT/SE2006/000608
Other languages
English (en)
Inventor
Gunnar EDERSTÅL
Helmut OBERMÜLLER
Original Assignee
Delaval Holding Ab
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 Delaval Holding Ab filed Critical Delaval Holding Ab
Priority to DE212006000045U priority Critical patent/DE212006000045U1/de
Publication of WO2006135301A1 publication Critical patent/WO2006135301A1/fr

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01J—MANUFACTURE OF DAIRY PRODUCTS
    • A01J5/00—Milking machines or devices
    • A01J5/007—Monitoring milking processes; Control or regulation of milking machines
    • A01J5/01—Milkmeters; Milk flow sensing devices
    • 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
    • G01F1/52—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 measuring the height of the fluid level due to the lifting power of the fluid flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
    • G01F23/72—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using magnetically actuated indicating means

Definitions

  • the present invention relates to an apparatus for measuring the flow of a liquid. More specifically the present invention relates to an apparatus for measuring the flow of a liquid according to the preamble of claim 1.
  • the milk flow will decrease when the udder of the animal is almost empty. Instead of continuing the milking after the milk flow has decreased below a certain level it is preferable to stop the milking and start milking another animal, as only a small amount of milk may be achieved, and as the teats of the animal may be injured during continued milking after the milk flow has decreased below said level. In order to be able to determine when the milk flow has fallen below a certain limit it is thus necessary to have a flow measurement apparatus.
  • the British Patent GB 1 280 160 describes a milk flow indicator which comprises an outer tube and an inner metering stem, wherein the milk is led into a chamber defined between the inner metering stem and the outer tube.
  • the metering stem comprises at least one metering aperture through which milk may flow from the chamber to the inside of the metering stem.
  • the level in the chamber depends on the milk flow.
  • An electrical sensing probe is arranged in the chamber for detection of when the milk level in the chamber is below a predetermined level.
  • US Patent 4,346,596 describes a milk flow measurement apparatus comprising a debubbling apparatus for receiving milk which may contain bubbles, and for removing bubbles therefrom.
  • the apparatus comprises an inner volume into which milk is arranged to flow.
  • the inner volume is connected with a measuring volume, which is connected to an outlet through a vertical slit.
  • the level of the milk in the measuring volume is dependent on the flow rate of the milk.
  • the level of the milk in the measuring volume is measured using an electrode.
  • the German Patent application DE 2447261 describes a flow meter for measuring the flow rate of the milk.
  • the flow meter comprises an inner volume with an inlet and an outlet.
  • a wall with at least one aperture is arranged between the inner volume and the outlet.
  • the milk level in the inner volume is dependent on the flow rate of the milk through the flow meter.
  • Various embodiments for measuring the milk level are described.
  • the UK Patent Application GB 2089049 describes a gaseous- liquid dual-phase fluid flow measuring apparatus. Gas and liquid are arranged to enter a separation chamber in which the gas and the liquid are separated. The liquid is allowed to pass to a measuring chamber from which the liquid may leave through vertical slit-like openings. The level of the liquid in the measuring volume is dependent on the flow rate of the liquid through the apparatus. A float with a magnet is arranged in the measuring volume. A plurality of leads are arranged to measure the position of the magnet and thus the level of liquid in the measuring volume.
  • An object of the present invention is to provide an apparatus for measuring the flow rate of a liquid which is an alternative to the apparatuses for measuring the flow rate of a liquid according to the prior art.
  • Another object of the present invention is to provide an apparatus for measuring the flow rate of a liquid which may be produced at a low cost.
  • Still another object of the present invention is to provide an apparatus for measuring the flow rate of a liquid which is more reliable in measuring the weight of the liquid which passes through the flow meter than apparatuses according to the prior art.
  • An apparatus for measuring the flow rate of a liquid comprises a length axis which is arranged to be essentially vertical during normal use, a housing with an inner space, an inlet for the liquid into the inner space, an outlet for the liquid out of the inner space, a parting wall arranged in the inner space and dividing the inner space into a float compartment and an outlet compartment, and a float arranged to float on the liquid in the float compartment.
  • the outlet is connected to the outlet compartment, wherein the parting wall defines a slit which has an extension parallell to the length axis and through which the liquid passes from the float compartment to the outlet compartment.
  • the size of the portion of the slit through which liquid flows depends on the level of the liquid in the float compartment.
  • the apparatus is characterized in that it comprises a position means arranged on the float and a sensor arranged at the bottom of the housing and arranged to measure a quantity which is dependent on the distance from the sensor to the position means, and to output a signal which is indicative of the distance between the sensor and the position means and thereby also indicative of the level of the liquid in the float compartment and thereby also the flow rate of the liquid through the flow compartment.
  • An apparatus according to the present invention is relatively un- complicated and inexpensive to manufacture.
  • the weight of the liquid flowing through the apparatus is measured due to the use of a float to measure the level of the liquid.
  • This is in contrast to the prior art apparatuses for flow measurement described in US 4,346,596 and GB 1 280 160, in which apparatuses an electrode is used for measuring the level of the liquid.
  • the volume of the liquid is measured.
  • a flow meter measuring the weight of the milk and not the volume.
  • the variation of the pressure differential between the pressure at the outlet and the pressure in the inner space must be known.
  • the apparatus described in GB 2089049 comprises a plurality of leading switches 14.
  • the fluid level is determined as being at the level of the leading switch being closest to the magnet in the float.
  • an apparatus according to the present invention is less complicated and may measure the level of the liquid more accurately than what is possible with a limited number of leading switches according to GB 2089049.
  • the measurement of the milk level by measuring a quantity which is dependent on the distance from the sensor to the position makes it possible to use an inexpensive sensor.
  • the sensor and the position means may be provided in many different ways.
  • the position means may comprise a permanent magnet, wherein the sensor is arranged to measure the magnetic field from the permanent magnet. Magnetic sensors are easily available and may be provided at a low cost.
  • the senor comprises a Hall effect element arranged to measure the magnetic field generated by the position means.
  • Hall effect elements are relatively cheap as they are based on a semiconductor circuit.
  • the sensor may consist of a transceiver while the position means may consist of a reflector.
  • the sensor is then arranged to send out an electromagnetic or acoustical pulse and to receive a pulse that has been reflected in the position sensor.
  • the transceiver is arranged to send out an electromagnetic pulse the pulse is preferably a light pulse.
  • Light transceivers are relatively inexpensive.
  • the float may be slidably arranged on the parting wall. In this way the motion of the float may be controlled to be along a straight line without adding any additional components to the apparatus.
  • the parting wall may comprise a tube which extends from the outlet parallell to the length axis. It is possible to arrange the parting wall in other ways. By arranging the parting wall as a tube it is, however, possible to arrange the float slidable on the parting wall. It is also easier to provide for the parting wall being movable.
  • the float may at least partly encircle the tube. This is an uncomplicated way of providing for the float being slidably arranged on the parting wall.
  • the parting wall may be arranged to be lifted by the float when the level of liquid in the float compartment is sufficiently high, thus providing a direct path from the float compartment to the outlet compartment and to the outlet.
  • the apparatus becomes less sensitive to any particles that may be stuck in the slit and hinder the flow of liquid from the float compartment. In case the flow is hindered the level of the liquid in the float compartment will rise until the level of the liquid is sufficiently high for the parting wall to be lifted by the float.
  • the apparatus may comprise a separation plate which further divides the inner space to also comprise a separation compartment, wherein the separation plate comprises a first passage for liquid and a second passage for gas, and wherein the inlet leads into the separation compartment.
  • the separation plate comprises a first passage for liquid and a second passage for gas
  • the inlet leads into the separation compartment.
  • the gas passage is preferably made sufficiently large for allowing gas to pass the passage without losses. It is important that low losses are achieved as the accuracy of the apparatus is dependent on a stable pressure at the outlet and in the inner space of the apparatus. It is important to keep the pressure differential between the pressure at the outlet and the pressure in the inner space essentially constant in order to achieve an accurate measurement of the flow rate.
  • the first passage may comprise a number of holes with corresponding hole axes. It is also possible that the first passage comprises a single hole through which the liquid may pass. In case the first passage comprises multiple holes the first passage may also function as a filter in which larger particles may be collected.
  • the first passage may comprise a first set of holes comprising at least one hole, wherein the hole axis of each hole in the first set of holes is essentially parallell to the length axis.
  • the first passage may comprise a second set of holes comprising at least one hole, wherein the hole axis of each hole in the first set of holes is essentially perpendicular to the length axis.
  • the second passage comprises a number of holes having their hole axes essentially perpendicular to the length axis of the apparatus.
  • the first set of holes is preferably combined with the second set of holes.
  • the apparatus according to the invention may comprise a gas passage for gas from the inlet to the outlet.
  • the gas passage is preferably dimensioned to provide for a minimum pressure drop between the inlet and the outlet. By minimizing the pressure drop the measurement of the flow may be made accurately. Any pressure drop variations over time may have an influence on the measurement.
  • the parting wall may comprise a passage at the bottom of the parting wall which provides for total emptying of the float compartment. This is advantageous in that it then is possible to avoid the slit from extending all the way down to the bottom of the parting wall, while still allowing the float compartment to be competely emptied after milking is finished.
  • Fig 1 shows an apparatus for measuring the flow of a liquid according to an embodiment of the present invention.
  • Fig 1 shows an apparatus 1 for measuring the flow of a liquid according to an embodiment of the present invention.
  • the apparatus 1 comprises a length axis 2 which is arranged to be essentially vertical during normal use of the apparatus.
  • the apparatus 1 further comprises a housing 3 with an inner space 4, an inlet 5 for the liquid into the inner space 4 and an outlet 6 for the liquid out of the inner space 4.
  • a parting wall 7 is arranged in the inner space and divides the inner space into a float compartment 8 and an outlet compartment 9.
  • the outlet 6 is connected to the outlet compartment 9.
  • the parting wall 7 is an open tube with a bottom edge 1 1 which stands on the bottom of the housing 3.
  • an opening 26 into the outlet compartment is provided by the open top end of the parting wall 7.
  • the parting wall 7 defines a slit 27 which extends parallell to the length axis 2 and through which the liquid 12 is arranged to pass from the float compartment 8 to the outlet compartment 9.
  • the size of the portion of the slit 27 through which liquid flows depends on the level of the liquid 12 in the float compartment 8.
  • the slit 27 ends at a distance from the bottom of the inner space.
  • a notch 24 is arranged extending from the bottom edge 1 1 to provide for draining of the float compartment 8.
  • a float 10 is arranged to float on the liquid 12 in the float compartment 8.
  • the float 10 is arranged encircling the parting wall 7. In this way the float 10 is slidably arranged on the parting wall 7 and may only move parallell to the length axis.
  • the float 10 comprises a position means 13 in the form of a permanent magnet arranged on the float 10.
  • a sensor 14 in the form of a magnetic field sensor is arranged at the bottom of the housing 3 and is arranged to measure the magnetic field at the sensor.
  • the magnetic field from the permanent magnet is dependent on the distance from the sensor 14 to the position means 13.
  • the magnetic field is a quantity that is dependent on the distance between the sensor 14 and the position means 13.
  • the sensor 14 is also arranged to output a signal, which is indicative of the distance between the sensor and the position means.
  • the distance between the sensor and the position means is dependent on the level of the liquid in the float compartment 8 which is dependent on the size of the flow through the float compartment 8.
  • the signal is also indicative of the flow rate of the liquid through the apparatus 1.
  • the sensor 14 is connected to a control unit 28.
  • the position means and the sensor by other means than by using a permanent magnet and a Hall element. It is for example possible to use a transmitter and a receiver as the sensor, and a reflecting surface as the position means.
  • the sensor may be arranged to transmit a pulse and to measure the time between the transmission of the pulse and the reception of the reflection from the position means.
  • the transmitter may be arranged to transmit e.g. an electromagnetic pulse or an acoustic pulse.
  • the apparatus 1 comprises a separation wall 15 which divides the inner space 4 to also comprise a separation compartment 16.
  • the inlet 5 leads into the separation compartment 16.
  • the separation plate 15 comprises a first passage in the form of a first set of holes 18 with corresponding hole axes 19 and a second set of holes 20 with corresponding hole axes 21.
  • the liquid may pass from the separation compartment 16 to the float compartment 8 through the first passage 18, 20.
  • the first set of holes 18 are arranged with their hole axes 19 essentially parallell with the length axis 2 while the second set of holes 20 are arranged with their hole axes 21 essentially perpendicular to the length axis 2.
  • the separation plate 15 also comprises a second passage 25 through which gas may pass from the separation compartment 16 to the float compartment 8.
  • the separation plate 15 also comprises a support 22 which extends essentially parallell to the length axis.
  • the parting wall 7 is arranged supported by the support 22 movable along the length axis 2.
  • the parting wall 7 is also provided with a flange 23.
  • the parting wall 7 is arranged to be lifted by the float 10 when the level of liquid in the float compartment 8 is sufficiently high for the float 10 to come into contact with the flange 23.
  • a milk line is connected to the outlet of the apparatus 1. Vacuum is applied to the outlet 6 through the milk line.
  • the inlet 5 is connected to a teat cup or a set of teat cups.
  • Milk and air enters the inner space 4 of the apparatus 1 through the inlet 5 and enters the separation compartment 16.
  • the air leaves the separation compartment through the second passage 25 into the float compartment 8 and further through the opening at the top of the parting wall 7 and out through the outlet 6.
  • the milk flows through the first set of holes 18 and the second set of holes 20 into the float compartment 8. At low flow rates the milk will flow primarily through the first set of holes 18, while at high flow rates the milk will flow also through the second set of holes 20.
  • the milk in the float compartment will flow through the slit 27 to the outlet compartment 9 and out through the outlet 6.
  • the level of milk in the float compartment 8 will depend on the flow rate of milk through the float compartment 8.
  • the sensor 14 measures the magnetic field at the sensor and outputs a signal which depends on the strength of the magnetic field. As the magnetic field at the sensor 14 is dependent on the distance between the permanent magnet and the sensor 14, the output signal from the sensor 14 will be indicative of the milk level in the float compartment 8 and thus the milk flow through the float compartment 8.
  • the shape of the float compartment and the size of the slit are chosen so that the float will not come into contact with the flange 23 during normal flows of milk from animals.
  • the control unit 28 may be calibrated so that the output signal from the sensor may be converted to a flow rate.
  • the milking is stopped. After the milking has been stopped the last milk is drained from the float compartment through the notch 24.
  • the apparatus is advantageously cleaned by flowing water through the apparatus.
  • Water is preferably flowed through the apparatus at a high flow rate so that water flows through the second set of holes 20.
  • the flow of water during cleaning is preferably sufficiently high for the float 10 to come in contact with the flange 23, so that the parting wall 7 is lifted. This will also contribute to an efficient cleaning of the inner space 4 of the apparatus 1.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Husbandry (AREA)
  • Environmental Sciences (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L’invention concerne un appareil (1) permettant de mesurer l’écoulement d’un liquide. L’appareil (1) comprend une entrée (5) débouchant dans un espace interne (4), une sortie (6) débouchant à l’extérieur de l’espace interne (4), une cloison de séparation (7) avec une fente (27) disposée dans l’espace interne (4) et divisant l’espace interne (4) en un compartiment flotteur (8) et un compartiment de sortie (9) connecté à la sortie (6), et un flotteur (10) disposé pour flotter sur le liquide dans le compartiment flotteur (8). L’appareil comprend un moyen de positionnement (13) disposé sur le flotteur (10) et un capteur (14) disposé au fond de l’appareil (1) et aménagé pour mesurer une quantité dépendant de la distance du capteur (14) au moyen de positionnement (13) et pour générer un signal, qui est indicatif de la distance entre le capteur (14) et le moyen de positionnement (13) et donc également du débit du liquide traversant le compartiment flotteur (8).
PCT/SE2006/000608 2005-06-16 2006-05-24 Appareil de mesure d’écoulement WO2006135301A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE212006000045U DE212006000045U1 (de) 2005-06-16 2006-05-24 Strömungsmessvorrichtung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0501374-3 2005-06-16
SE0501374 2005-06-16

Publications (1)

Publication Number Publication Date
WO2006135301A1 true WO2006135301A1 (fr) 2006-12-21

Family

ID=37532567

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2006/000608 WO2006135301A1 (fr) 2005-06-16 2006-05-24 Appareil de mesure d’écoulement

Country Status (2)

Country Link
DE (1) DE212006000045U1 (fr)
WO (1) WO2006135301A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2378678A1 (es) * 2010-03-17 2012-04-17 Universidad De Extremadura Dispositivo autom�?tico de medición del volumen de leche ordeñada.
EP3155897A1 (fr) * 2015-10-15 2017-04-19 N.V. Nederlandsche Apparatenfabriek NEDAP Debitmetre
EP3329767A1 (fr) * 2016-12-05 2018-06-06 N.V. Nederlandsche Apparatenfabriek NEDAP Compteur à lait
EP3628146A1 (fr) * 2018-09-28 2020-04-01 Nedap N.V. Compteur à lait

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3832970A (en) * 1971-12-03 1974-09-03 Alfa Laval Ab Flow indicator
GB2089049A (en) * 1980-11-19 1982-06-16 Orion Machinery Co Ltd Gaseous-liquid dual-phase fluid flow measurement
US4372249A (en) * 1980-05-28 1983-02-08 Westfalia Separator Ag Volumetric apparatus for milk and method of measuring the total quantity of milk collected from a cow in milking
EP1106059A2 (fr) * 1996-01-16 2001-06-13 Dec International, Inc. Dispositif de mesure de lait
WO2003004357A1 (fr) * 2001-07-06 2003-01-16 Icon Dynamics, Llc Systeme, appareil et procede de mesure et de transfert de contenus d'une cuve
WO2004042329A1 (fr) * 2002-11-08 2004-05-21 Acos Limited Appareil de mesure d'ecoulement de liquide

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3832970A (en) * 1971-12-03 1974-09-03 Alfa Laval Ab Flow indicator
US4372249A (en) * 1980-05-28 1983-02-08 Westfalia Separator Ag Volumetric apparatus for milk and method of measuring the total quantity of milk collected from a cow in milking
GB2089049A (en) * 1980-11-19 1982-06-16 Orion Machinery Co Ltd Gaseous-liquid dual-phase fluid flow measurement
EP1106059A2 (fr) * 1996-01-16 2001-06-13 Dec International, Inc. Dispositif de mesure de lait
WO2003004357A1 (fr) * 2001-07-06 2003-01-16 Icon Dynamics, Llc Systeme, appareil et procede de mesure et de transfert de contenus d'une cuve
WO2004042329A1 (fr) * 2002-11-08 2004-05-21 Acos Limited Appareil de mesure d'ecoulement de liquide

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2378678A1 (es) * 2010-03-17 2012-04-17 Universidad De Extremadura Dispositivo autom�?tico de medición del volumen de leche ordeñada.
EP3155897A1 (fr) * 2015-10-15 2017-04-19 N.V. Nederlandsche Apparatenfabriek NEDAP Debitmetre
NL2015620B1 (nl) * 2015-10-15 2017-05-08 N V Nederlandsche Apparatenfabriek Nedap Melkmeter.
US9958304B2 (en) 2015-10-15 2018-05-01 N. V. Nederlandsche Apparatenfabriek Nedap Milk meter
EP3329767A1 (fr) * 2016-12-05 2018-06-06 N.V. Nederlandsche Apparatenfabriek NEDAP Compteur à lait
NL2017924B1 (nl) * 2016-12-05 2018-06-18 N V Nederlandsche Apparatenfabriek Nedap Melkmeter
US10905089B2 (en) 2016-12-05 2021-02-02 N.V. Nederlandsche Apparatenfabriek Nedap Milk meter
EP3628146A1 (fr) * 2018-09-28 2020-04-01 Nedap N.V. Compteur à lait
NL2021725B1 (nl) * 2018-09-28 2020-05-07 Nedap Nv Melkmeter
US11346693B2 (en) 2018-09-28 2022-05-31 Nedap N.V. Milk meter

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