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WO1996036851A1 - Apparatus for the measurement of liquid flow - Google Patents

Apparatus for the measurement of liquid flow Download PDF

Info

Publication number
WO1996036851A1
WO1996036851A1 PCT/FI1996/000268 FI9600268W WO9636851A1 WO 1996036851 A1 WO1996036851 A1 WO 1996036851A1 FI 9600268 W FI9600268 W FI 9600268W WO 9636851 A1 WO9636851 A1 WO 9636851A1
Authority
WO
WIPO (PCT)
Prior art keywords
vessel
dam
pipe
liquid
measuring device
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.)
Ceased
Application number
PCT/FI1996/000268
Other languages
French (fr)
Inventor
Juha Karvinen
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.)
Ecopump Oy
Original Assignee
Ecopump Oy
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 Ecopump Oy filed Critical Ecopump Oy
Priority to AU56513/96A priority Critical patent/AU5651396A/en
Publication of WO1996036851A1 publication Critical patent/WO1996036851A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • G01F23/14—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 measurement of pressure
    • 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

Definitions

  • the present invention relates to an apparatus as defined in the preamble of claim 1.
  • a solution is known in which the rise in liquid level caused by a dam in a channel is measured.
  • the level is pro ⁇ portional to the flow rate according to a mathematical for ⁇ mula or a curve obtained via calibration measurements.
  • a known measuring device is used to measure a pipe partly filled with liquid, the pipe must have a long horizontal portion to ensure an accurate measurement result.
  • the object of the present invention is to achieve a com- pletely new type of apparatus in which a flow measurement on a pipe in a vertical or slanting position yields an ac ⁇ curate result regardless of the height of fall above the apparatus.
  • the invention is based on the idea that a container is mounted in a pipe and dam flow measurement is performed in ⁇ side the container.
  • the invention has numerous significant advantages.
  • the ap ⁇ paratus makes it possible to achieve an accurate and well reproducible flow measurement e.g. on the exit ducts of the wire and press section of a paper machine.
  • the apparatus can be easily installed- without major changes in the pip ⁇ ing. In the most advantageous case, it is only necessary to remove a portion corresponding to the length of the measur ⁇ ing device from the pipe and connect the measuring device in place of the removed portion. Quick installation will minimize process down time.
  • the apparatus comprises a frame 12 with an inflow pipe 8 connected to its upper part and an outflow pipe 11 con ⁇ nected to its lower part.
  • a partition 2 with an opening 1 in it.
  • the parti ⁇ tion 2 forms a so-called dam vessel, into which liquid is passed from the inflow pipe 8.
  • the apparatus is based on a damming procedure, in which the water level in the dam ves ⁇ sel rises as the amount of water supplied into it in ⁇ creases.
  • the water level is measured by means of a measur ⁇ ing element 3, e.g. a differential pressure transmitter.
  • the liquid flowing into the chamber increases the pressure in the vessel.
  • a negative pressure condition may prevail in the pipe.
  • nipple 6 Placed in the lower part of the dam vessel is a nipple 6 connecting the vessel to the measuring element 3.
  • the liq ⁇ uid also moves in the direction of the measurement nipple 6.
  • This dynamic pressure is the higher the larger is the height of fall above the apparatus.
  • This error factor has been eliminated by placing a plate 7 near the nipple ori ⁇ fice, in front of it.
  • the velocity of flow of the liquid flowing from the inflow pipe 8 into the dam vessel is reduced by providing the in- flow pipe with a contraction 9 and/or by placing at least one, preferably transverse retarding vane 10 in the pipe.
  • the dam vessel is provided with at least one plate 14 to guide the flow so that a controlled flow inside the vessel is achieved.
  • the invention works as follows: Liquid is supplied into the apparatus via the inflow pipe. The velocity of flow is re ⁇ tarded by means of the vanes 10 and the contraction 9. Af ⁇ ter the retardation, the liquid enters into a dam vessel containing an accurately calibrated dam, and the liquid level produced by the dam is measured by means of a measur ⁇ ing element, such as a differential pressure transmitter 3. After the dam, the liquid is passed into the outflow pipe 11. Positive or negative pressure generated in the dam ves- sel is compensated by means of a pipe 4 connected from the negative side of the transmitter 3 to the upper part of the chamber.
  • any liquid possibly appearing in this pipe 4 is passed to the outflow side of the apparatus, preferably to the outflow pipe 11, in such a way that it will not disturb the operation of the measuring element 3, preferably via a pipe 5.
  • a preferred implementation of this is one in which a portion of the pipe 4 or a separate connecting pipe 13 is so connected to the transmitter that it is slightly in ⁇ clined in a direction away from the transmitter.
  • the liquid moving inside the dam vessel does not disturb the operation of the transmitter, because a guard plate 7 is provided in front of the nipple 6.
  • the measuring apparatus of the invention is especially ap ⁇ plicable for water quantity measurements in paper industry, in particular for measurements in the press and wire sec ⁇ tion of a paper machine.

Landscapes

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

Abstract

Apparatus for the measurement of liquid quantity, comprising a frame (12) with a chamber inside it, an inflow pipe (8) connected to the upper part of the frame to pass liquid into the chamber, an outflow pipe (11) connected to the lower part of the frame to pass liquid out of the chamber, elements (1, 2) placed in the chamber to form a dam vessel and means (3) for measuring the liquid level in the dam vessel (2). The means for measuring the liquid level consist of a measuring device (3) preferably connected via a measurement connection (6) to a desired point below the liquid level in the dam vessel (2), and that a compensating connection (4) is provided from a point above the liquid level to the measuring device (3), so that the measuring device (3) measures the pressure difference between said connections (4, 6).

Description

APPARATUS FOR THE MEASUREMENT OF LIQUID FLOW
The present invention relates to an apparatus as defined in the preamble of claim 1.
A solution is known in which the rise in liquid level caused by a dam in a channel is measured. The level is pro¬ portional to the flow rate according to a mathematical for¬ mula or a curve obtained via calibration measurements. When a known measuring device is used to measure a pipe partly filled with liquid, the pipe must have a long horizontal portion to ensure an accurate measurement result.
The object of the present invention is to achieve a com- pletely new type of apparatus in which a flow measurement on a pipe in a vertical or slanting position yields an ac¬ curate result regardless of the height of fall above the apparatus.
The invention is based on the idea that a container is mounted in a pipe and dam flow measurement is performed in¬ side the container.
In more precise terms, the invention is characterized by what is presented in the claims.
The invention has numerous significant advantages. The ap¬ paratus makes it possible to achieve an accurate and well reproducible flow measurement e.g. on the exit ducts of the wire and press section of a paper machine. The apparatus can be easily installed- without major changes in the pip¬ ing. In the most advantageous case, it is only necessary to remove a portion corresponding to the length of the measur¬ ing device from the pipe and connect the measuring device in place of the removed portion. Quick installation will minimize process down time.
In the following, the invention is described by referring to the attached drawing, which presents a sectioned and simplified view of an apparatus as provided by the inven¬ tion.
The apparatus comprises a frame 12 with an inflow pipe 8 connected to its upper part and an outflow pipe 11 con¬ nected to its lower part. In the chamber inside the frame, there is a partition 2 with an opening 1 in it. The parti¬ tion 2 forms a so-called dam vessel, into which liquid is passed from the inflow pipe 8. The apparatus is based on a damming procedure, in which the water level in the dam ves¬ sel rises as the amount of water supplied into it in¬ creases. The water level is measured by means of a measur¬ ing element 3, e.g. a differential pressure transmitter. The liquid flowing into the chamber increases the pressure in the vessel. In addition, a negative pressure condition may prevail in the pipe. This leads to an erroneous meas¬ urement result. The error is eliminated by means of a pres¬ sure compensating pipe 4, through which the pressure exist¬ ing above the liquid column is passed to the negative side of the transmitter. To prevent condensation of the liquid and to reduce the effects of possible splashes getting into the compensating pipe, an exit pipe 5 is provided from the transmitter to a point below the dam vessel.
Placed in the lower part of the dam vessel is a nipple 6 connecting the vessel to the measuring element 3. The liq¬ uid also moves in the direction of the measurement nipple 6. This dynamic pressure is the higher the larger is the height of fall above the apparatus. This error factor has been eliminated by placing a plate 7 near the nipple ori¬ fice, in front of it.
The velocity of flow of the liquid flowing from the inflow pipe 8 into the dam vessel is reduced by providing the in- flow pipe with a contraction 9 and/or by placing at least one, preferably transverse retarding vane 10 in the pipe. Moreover, the dam vessel is provided with at least one plate 14 to guide the flow so that a controlled flow inside the vessel is achieved.
The invention works as follows: Liquid is supplied into the apparatus via the inflow pipe. The velocity of flow is re¬ tarded by means of the vanes 10 and the contraction 9. Af¬ ter the retardation, the liquid enters into a dam vessel containing an accurately calibrated dam, and the liquid level produced by the dam is measured by means of a measur¬ ing element, such as a differential pressure transmitter 3. After the dam, the liquid is passed into the outflow pipe 11. Positive or negative pressure generated in the dam ves- sel is compensated by means of a pipe 4 connected from the negative side of the transmitter 3 to the upper part of the chamber. Any liquid possibly appearing in this pipe 4 is passed to the outflow side of the apparatus, preferably to the outflow pipe 11, in such a way that it will not disturb the operation of the measuring element 3, preferably via a pipe 5. A preferred implementation of this is one in which a portion of the pipe 4 or a separate connecting pipe 13 is so connected to the transmitter that it is slightly in¬ clined in a direction away from the transmitter.
The liquid moving inside the dam vessel does not disturb the operation of the transmitter, because a guard plate 7 is provided in front of the nipple 6.
The measuring apparatus of the invention is especially ap¬ plicable for water quantity measurements in paper industry, in particular for measurements in the press and wire sec¬ tion of a paper machine.
It is obvious to a person skilled in the art that the in¬ vention is not restricted to the embodiments described above, but that it may instead be varied in the scope of the following claims.

Claims

1. Apparatus for the measurement of liquid quantity, com¬ prising a frame (12) with a chamber inside it, an inflow pipe (8) connected to the upper part of the frame to pass liquid into the chamber, an outflow pipe (11) connected to the lower part of the frame to pass liquid out of the cham¬ ber, elements (1, 2) placed in the chamber to form a da vessel and means (3) for measuring the liquid level in the dam vessel (2), characterized in that the means for measur¬ ing the liquid level consist of a measuring device (3) preferably connected via a measurement connection (6) to a desired point below the liquid level in the dam vessel (2), and that a compensating connection (4) is provided from a point above the liquid level to the measuring device (3), so that the measuring device (3) measures the pressure dif¬ ference between said connections (4, 6) .
2. Apparatus as defined in claim 1, characterized in that it is provided with an exit pipe (5) leading from the com¬ pensating connection (4) to a point below the dam vessel (2) .
3. Apparatus as defined in claim 1 or 2, characterized in that the measuring device (3) is connected to the compen¬ sating pipe (4) via a connecting pipe (13) inclined in a downward direction.
4. Apparatus as defined in any one of claims 1 - 3, charac- terized in that it comprises a plate (7) placed in front of the measurement connection (6) .
5. Apparatus as defined in any one of claims 1 - 4, charac¬ terized in that its inflow pipe (8) is provided with a con- traction (9) .
6. Apparatus as defined in any one of claims 1 - 5, charac¬ terized in that its inflow pipe (8) is provided with at least one retarding vane (10) .
7. Apparatus as defined in any one of claims 1 - 6, charac¬ terized in that the dam vessel (2) is provided with at least one guide plate (14) for guiding liquid flow.
8. Apparatus as defined in any one of claims 1 - 7, charac¬ terized in that at least a part of the side wall of the frame (12) forms part of the wall of the dam vessel (2) .
9. Apparatus as defined in any one of claims 1 - 8, charac¬ terized in that the measuring device (3) is a differential pressure transmitter.
PCT/FI1996/000268 1995-05-15 1996-05-13 Apparatus for the measurement of liquid flow Ceased WO1996036851A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU56513/96A AU5651396A (en) 1995-05-15 1996-05-13 Apparatus for the measurement of liquid flow

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI952363A FI98093C (en) 1995-05-15 1995-05-15 Apparatus for measuring fluid flow
FI952363 1995-05-15

Publications (1)

Publication Number Publication Date
WO1996036851A1 true WO1996036851A1 (en) 1996-11-21

Family

ID=8543421

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1996/000268 Ceased WO1996036851A1 (en) 1995-05-15 1996-05-13 Apparatus for the measurement of liquid flow

Country Status (3)

Country Link
AU (1) AU5651396A (en)
FI (1) FI98093C (en)
WO (1) WO1996036851A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5875675A (en) * 1997-09-24 1999-03-02 Ecopump Oy Apparatus for the measurement of liquid flow
EP1772709A3 (en) * 2005-10-07 2009-06-17 Voith Paper Patent GmbH Measuring apparatus, in particular for measuring dewatering amounts of paper machines
WO2018142024A1 (en) * 2017-02-02 2018-08-09 Runtech Systems Oy Apparatus for measuring the dewatering of a paper machine at different points of the wet end and a method for implementing it

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH492958A (en) * 1968-11-02 1970-06-30 Gerdts Gustav F Kg Device for measuring the flow rate of liquids under pressure
US3527251A (en) * 1967-12-21 1970-09-08 Gambro Ag Device intended for metering the flow of a liquid preferably blood
DE2447261A1 (en) * 1974-10-03 1976-04-08 Reuschenbach Hermann Flowmeter determining volumetric flow of liquids by pressure chamber - is used especially to measure milk flow in dairy installations
DE3740603A1 (en) * 1987-12-01 1989-06-15 Eckardt Ag Device for measuring the volume flow of a liquid flowing out of or into an open container
DE4133542A1 (en) * 1991-10-10 1993-04-15 Manfred Husslein Stationary measurement device for monitoring internal combustion engine fuel consumption - has vertical measurement tube with e.g. differential pressure transducer at lower end

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3527251A (en) * 1967-12-21 1970-09-08 Gambro Ag Device intended for metering the flow of a liquid preferably blood
CH492958A (en) * 1968-11-02 1970-06-30 Gerdts Gustav F Kg Device for measuring the flow rate of liquids under pressure
DE2447261A1 (en) * 1974-10-03 1976-04-08 Reuschenbach Hermann Flowmeter determining volumetric flow of liquids by pressure chamber - is used especially to measure milk flow in dairy installations
DE3740603A1 (en) * 1987-12-01 1989-06-15 Eckardt Ag Device for measuring the volume flow of a liquid flowing out of or into an open container
DE4133542A1 (en) * 1991-10-10 1993-04-15 Manfred Husslein Stationary measurement device for monitoring internal combustion engine fuel consumption - has vertical measurement tube with e.g. differential pressure transducer at lower end

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5875675A (en) * 1997-09-24 1999-03-02 Ecopump Oy Apparatus for the measurement of liquid flow
WO1999015861A1 (en) * 1997-09-24 1999-04-01 Ecopump Oy Apparatus for the measurement of liquid flow
EP1772709A3 (en) * 2005-10-07 2009-06-17 Voith Paper Patent GmbH Measuring apparatus, in particular for measuring dewatering amounts of paper machines
WO2018142024A1 (en) * 2017-02-02 2018-08-09 Runtech Systems Oy Apparatus for measuring the dewatering of a paper machine at different points of the wet end and a method for implementing it
US11634866B2 (en) 2017-02-02 2023-04-25 Runtech Systems Oy Apparatus for measuring the dewatering of a paper machine at different points of the wet end and a method for implementing it

Also Published As

Publication number Publication date
FI952363A0 (en) 1995-05-15
FI98093B (en) 1996-12-31
AU5651396A (en) 1996-11-29
FI98093C (en) 1997-04-10

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