GB2223099A - An improved flowmeter having a chamber in which liquid level is measured ultrasonically - Google Patents
An improved flowmeter having a chamber in which liquid level is measured ultrasonically Download PDFInfo
- Publication number
- GB2223099A GB2223099A GB8822476A GB8822476A GB2223099A GB 2223099 A GB2223099 A GB 2223099A GB 8822476 A GB8822476 A GB 8822476A GB 8822476 A GB8822476 A GB 8822476A GB 2223099 A GB2223099 A GB 2223099A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chamber
- flowmeter
- flow
- liquid
- weir
- 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.)
- Granted
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 17
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 abstract 1
- 230000002285 radioactive effect Effects 0.000 description 2
- 238000011088 calibration curve Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/002—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow wherein the flow is in an open channel
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/20—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow
- G01F1/22—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by detection of dynamic effects of the flow by variable-area meters, e.g. rotameters
-
- 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
- G01F23/22—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—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 measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2962—Measuring transit time of reflected waves
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Measuring Volume Flow (AREA)
Abstract
A flowmeter comprising a chamber 1 to receive a liquid flow and having a V-notch weir 12 in the outlet 3 from the chamber. An ultrasonic transducer 6 monitors the height of liquid in the chamber in front of the weir to provide a measurement of flow rate through the chamber. Baffles 10, 11 can be provided in the chamber to stabilise the flow. The angle of the notch 12 is chosen so that the flowmeter is suitable for low rates of flow. A calibration procedure is carried out at a known flow rate. <IMAGE>
Description
An improved flowmeter
The present invention concerns a flowmeter, in particular a flowmeter for use in the determination of low rates of liquid flow.
According to the present invention a flowmeter comprises a chamber having an inlet and an outlet for a liquid flow, a V-notch weir in the outlet and an ultrasonic transducer to monitor the height of liquid in the chamber in front of the weir to thereby provide a measurement of flow rate through the chamber.
Preferably the weir incorporates an angle of about i5 to cater for low flow rates, that is, flow rates less than 5 litres/minute. The flow rate can be in the region of 1 litre/minute.
Conveniently, baffles are provided in the chamber to stabilise flow through the chamber from the inlet to the outlet.
The invention will be described further, by way of exmaple, with reference to the accompanying drawings; in which:
Figure 1 is a sectional elevation of a flowmeter;
Figure 2 is a section on A-A in Figure 1; and
Figure 3 is a view in the direction B in Figure 1.
The flowmeter comprises a chamber 1 having an inlet pipe 2 and an outlet pipe 3. The outlet pipe 3 has an initial portion of increased diameter coaxial with the inlet pipe 2, this initial portion reducing through an eccentric to a final portion of the same diameter as the inlet pipe 2. A drain plug 4 is provided in base 5 of the chamber and an ultrasonic transducer assembly 6 is carried in a cover 7 which is secured by bolts 8 to a flanged neck 9 of the chamber 1.
Two baffle plates are located within the chamber 1.
A first baffle plate 10 is fixedly secured to the base 5 and extends across and beyond the inlet pipe 2. A second baffle plate 11 is fixedly secured across the chamber and spaced above the base 5. The baffle plates stabilise incoming liquid flowing from the inlet pipe 2 into the chamber.
A V-shaped notch 12 in a vertical thin plate 13 constitutes a weir in the initial portion of the outlet pipe 3. Conveniently the V-shaped notch incorporates an angle of or about 15 to cater for low flow rates.
During testing and calibrating, a liquid conveniently water was allowed to flow into the chamber 1 to initiate a flow over the V-notch weir. Liquid was introduced at a known flow rate and the flow levels allowed to stabilise. The volume of liquid flowing through the chamber and across the weir was collected and measured. The level of the liquid surface in the chamber 1 was measured and recorded by the ultrasonic transducer assembly. The level of liquid for zero flow through the weir constitutes the datum level. A calibration curve is obtained by plotting volumetric flow in litres/minute against height of liquid surface above the datum level.
In use and for the measurement of radioactive flows the flowmeter can be mounted behind shielding. The ultrasonic transducer is clear of the liquid and can therefore be removed if required for repair or replacement. For use with radioactive liquids the flowmeter can be constructed from stainless steel.
Claims (6)
1, A flowmeter comprising a chamber having an inlet and an outlet for a liquid flow, a V-notch weir in the outlet and an ultrasonic transducer to monitor the height of liquid in the chamber in front of the weir to thereby provide a measurement of flow rate through the chamber.
2. A flowmeter as claimed in claim 1 in which the
V-notch incorporates an angle of or about 15.
3. A flowmeter as claimed in claim 1 or 2 including baffles in the chamber to stabilise flow through the chamber.
4. A flowmeter as claimed in any preceding claim in which the transducer is releasably mounted on the chamber.
5. A flowmeter as claimed in any preceding claim in which the outlet has an initial portion of increased diameter coaxial with the inlet, the initial portion reducing through an eccentric to a final portion of the same diameter as the inlet.
6. A flowmeter substantially as herein described with reference to and as illustrated in the accompanying drawings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8822476A GB2223099B (en) | 1988-09-23 | 1988-09-23 | An improved flowmeter |
| IT8967788A IT1232924B (en) | 1988-09-23 | 1989-09-22 | FLOW METER DEVICE |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8822476A GB2223099B (en) | 1988-09-23 | 1988-09-23 | An improved flowmeter |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8822476D0 GB8822476D0 (en) | 1988-10-26 |
| GB2223099A true GB2223099A (en) | 1990-03-28 |
| GB2223099B GB2223099B (en) | 1992-04-15 |
Family
ID=10644179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8822476A Expired - Lifetime GB2223099B (en) | 1988-09-23 | 1988-09-23 | An improved flowmeter |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2223099B (en) |
| IT (1) | IT1232924B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0532938A1 (en) * | 1991-08-21 | 1993-03-24 | Fischer & Porter GmbH | Device for measuring flow of a liquid containing electrical charges |
| NL9300504A (en) * | 1993-03-22 | 1994-10-17 | Paulus Arthur Ubald Lukas Verk | Wastewater inspection, measuring and/or sampling device |
| GB2400676A (en) * | 2003-04-16 | 2004-10-20 | Bryan Frederick Davenport | A flow measuring apparatus including a weir with an integral nozzle |
| EP2278279A1 (en) * | 2009-07-24 | 2011-01-26 | EHP-Tekniikka Oy | Thermally insulated flowmeter casing |
-
1988
- 1988-09-23 GB GB8822476A patent/GB2223099B/en not_active Expired - Lifetime
-
1989
- 1989-09-22 IT IT8967788A patent/IT1232924B/en active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0532938A1 (en) * | 1991-08-21 | 1993-03-24 | Fischer & Porter GmbH | Device for measuring flow of a liquid containing electrical charges |
| US5327787A (en) * | 1991-08-21 | 1994-07-12 | Fischer & Porter Company | Electromagnetic flow meter with weir |
| NL9300504A (en) * | 1993-03-22 | 1994-10-17 | Paulus Arthur Ubald Lukas Verk | Wastewater inspection, measuring and/or sampling device |
| GB2400676A (en) * | 2003-04-16 | 2004-10-20 | Bryan Frederick Davenport | A flow measuring apparatus including a weir with an integral nozzle |
| GB2400676B (en) * | 2003-04-16 | 2006-04-05 | Bryan Frederick Davenport | Liquid flow measuring apparatus |
| EP2278279A1 (en) * | 2009-07-24 | 2011-01-26 | EHP-Tekniikka Oy | Thermally insulated flowmeter casing |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8822476D0 (en) | 1988-10-26 |
| IT1232924B (en) | 1992-03-05 |
| GB2223099B (en) | 1992-04-15 |
| IT8967788A0 (en) | 1989-09-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20010923 |