GB2033970A - Syringe Device for Calibrating Oil-in-water Meters - Google Patents
Syringe Device for Calibrating Oil-in-water Meters Download PDFInfo
- Publication number
- GB2033970A GB2033970A GB7933140A GB7933140A GB2033970A GB 2033970 A GB2033970 A GB 2033970A GB 7933140 A GB7933140 A GB 7933140A GB 7933140 A GB7933140 A GB 7933140A GB 2033970 A GB2033970 A GB 2033970A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulse
- pulse train
- fluid
- cylinder
- plunger
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 239000012530 fluid Substances 0.000 claims description 37
- 238000002156 mixing Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
- G01F11/02—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement
- G01F11/021—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type
- G01F11/029—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers which expand or contract during measurement of the piston type provided with electric controlling means
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
- G05D11/131—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring the values related to the quantity of the individual components
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D11/00—Control of flow ratio
- G05D11/02—Controlling ratio of two or more flows of fluid or fluent material
- G05D11/13—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
- G05D11/131—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring the values related to the quantity of the individual components
- G05D11/132—Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring the values related to the quantity of the individual components by controlling the flow of the individual components
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Fluid Mechanics (AREA)
- Reciprocating Pumps (AREA)
- Accessories For Mixers (AREA)
Abstract
A syringe device e.g. for supplying small measured quantities of oil into a water stream for calibrating an oil-in- water meter, comprises a cylinder 1 for receiving the oil and having a tubular piston rod 3 on which a nut 9, engaging a rotatable threaded rod 12, is mounted. The rod 12 may be rotated by an electric motor controlled by a pulse system providing an accurate oil delivery from the cylinder. <IMAGE>
Description
SPECIFICATION
Calibrating Oil in Water Meters
This invention relates to fluid dosing arrangements for calibrating fluid pollution measuring systems and in particular to arrangements for calibrating oil-in-water meters.
Present oil tanker navigation is submitted to increasingly stringent regulations in relation to pollution of the sea water by fluids drained therein. In order to comply with these regulations in many places aboard a tanker the oil content of bilge water and the like is measured by measuring apparatus installed to this purpose. In order to be able to guarantee the reliability of the indications of the measuring apparatus a periodical calibration is necessary in which the accuracy of the calibration apparatus used should be one order of magnitude higher than that of the measuring apparatus. Generally, the calibrating apparatus consists of a pump which delivers a stream of water of about 1000 liter/hour to which a changing, but accurately known quantity of oil is added.Subsequently the stream of water containing the accurately known oil content is passed through the measuring apparatus in which the oil content indication of the apparatus can be compared with the accurately known content of the calibrating fluid. The lowest measuring and calibrating ranges which should be provided by this method are 0--20 volume parts oil to 1,000,000 volume parts water, in other words 0--20 ppm. Accordingly this implies that an oil stream having a delivery which is controllable between 0 and 20 cm3/hour with an accuracy of 0.2 cm3/hour should be injected into the water stream. The controllability of the oil delivery not only serves the purpose of adjustment of the various calibrating values of the oil content, but also to be able to follow changes in the water delivery because relative quantities and not absolute quantities are concerned.
The problem arising in the above procedure lies in the fact that none of the prior art dosing arrangements is able to supply a fluid delivery which is subject to relatively fast changes and amounts to only a few cm3 of fluid per hour with the required accuracy.
According to one aspect of the present invention there is provided a dosing arrangement for a fluid, including a cylinder having a single aperture, serving the purpose of both of an inlet and outlet for the fluid to be dosed, a plunger movably arranged in the cylinder and extending sealingly through one of the cylinder end walls, the plunger being provided with an extension which is guided by a guiding means arranged ir a fixed position relative to the cylinder so as to prevent the plunger from rotating relative to the cylinder, in which the plunger from the end protruding from the cylinder is provided with a bore not completely passing through the plunger, in which the plunger near said end is provided with an internal thread having a diameter which is smaller than the diameter of the bore, in which the internal thread engages with a threaded rod which at its one side is bearing in said internal thread and at the other side is bearing in a bearing which positions the threaded rod in the radial and longitudinal direction relative to the cylinder, and wherein the rotational position of the threaded rod is continuously variable by a driving means which is provided with a position indicator.
The dosing arrangement may be employed for blending two fluids in an adjusted fixed blending ratio if the driving member consists of an electrical or air motor and the position indicator consists of a pulse transmitter which delivers a predetermined number of pulses evenly distributed over one revolution per revolution of the driving shaft of the driving member, in which the delivery of the first fluid is measured by a flowmeter which generates one pulse for a predetermined quantity of fluid passed, that said first pulse train is passed through an adjustable pulse scaler which converts the first pulse train into a second pulse train, the pulse rate of said second train having a fixed adjustable ratio to the pulse rate of the first train, whereafter the pulse rate of said second train is compared in a pulse rate comparator with the pulse rate of a third pulse train generated by the pulse transmitter on the driving shaft and in which when the pulse rate of the second pulse train exceeds the pulse rate of the third pulse train the speed of the driving motor is increased whereas when the pulse rate of the third pulse train exceeds the speed of the driving motor is decreased.
The invention will now be described by way of example with reference to the accompanying drawings in which:
Figs. 1 and 2 are partional elevational, partional longitudinal sectional views of the dosing arrangement: the parts shown utmost right in Fig. 2 are the same as the parts shown utmost left in Fig. 1;
Fig. 3 shows a schematic diagram of the dosing arrangement in use for blending two fluids in a fixed blending ratio, and
Fig. 4 is a schematic diagram of an alternative use of the dosing arrangement for blending two fluids in a fixed blending ratio.
Fig. 1 shows a cylinder 1 which is closed except for an aperture 2, in which cylinder a generally tube-shaped plunger or piston 3 can move in an axial direction. The plunger is at its one end guided coaxially in cylinder 1 by an apertured guiding member 4 which closes the hollow plunger at one end, and at its other end is guided in a bore 5 of flange 6. In the flange 6 a recess is machined in which a collar seal 7 is arranged which seals plunger 3 against flange 6.
The cylinder end directed away from flange 6 is closed by means of a plug 8 having an aperture 2 therein.
Through aperture 2 the dosing fluid may enter or leave the cylinder. A displacement of the plunger 3 in the cylinder 1 is provided by a threading mechanism. To this end the plunger 3 at its end directed away from guiding member 4 is secured to a nut 9 having a two-pronged fork, which nut is provided with internal thread 10 having a core diameter which is smaller than the inner diameter of the plunger. The internal thread 10 engages a threaded rod 12 which in that position is radially guided by the nut 9 having the two-pronged fork 11. The left handed of threaded rod 12 is radially and axially fixedly supported by a ball bearing 13.By rotating the threaded rod 1 2 which is fixedly supported in the axial direction, the combination of the plunger 3 and nut 9 may be displaced axially, the nut is being prevented from rotating by the threaded rod due to the two-pronged fork 11 of nut 9 which engages the guiding rod 14, one end of which is inserted in a bore in flange 6.The ball bearing 13 and the other end of the guiding rod 14 are held in position while they are confined by flange 15, said flange and flange 6 being held in spaced relationship by an intermediate member 1 6. The confinement of ball bearing 13 within flange 1 5 is done by means of a nut 1 7. The rotational drive of the threaded rod 12 is provided by means of an electric motor 1 8 through a reduction gear 1 9 and a coupling providing proper alignment of the driving shaft of the reduction gear and the threaded rod. Generally the coupling consists of a pin 20 perpendicularly arranged in the driving shaft which engages axial slots 21 arranged in a bushing which is secured to the end of threaded rod 12.The motor 1 8 is combined with the reduction gear 19, the latter being secured to flange 1 5 by means of end portion 22. On the extended motor shaft a disc 23 is secured having teeth at its periphery which may cooperate with an optical or magnetical detector 24 which itself is secured to the motor by means of a clamp 25.
In this way the disc 23 and the detector 24 provide a pulse transmitter which delivers a predetermined member of electrical pulses for each revolution of the motor shaft and evenly distributed over each revolution.
The following numeral example will show that the dosing arrangement is able to deliver a quantity of fluid for each unit of time which is readily controllable and adjustable. Suppose the number of teeth on the disc to be 1 6, the gearing ratio of the reduction gear to be 625, the pitch of the threaded rod to be 1 mm and the surface of the cross section of the plunger to be 1 cm2, then the quantity of fluid delivered for each pulse generated by the pulse transmitter amounts to
1/1 6x 1/625 x0.1 x 1=1 0-5 cm3. When a dosing arrangement having the above data for instance is used to provide a calibrating fluid having a delivery of 900 liter per hour and an oil content which is adjustable between 0 and 20 pm, then a simple calculation shows that this corresponds to a pulse frequency range from 0 to 500 Hz.An advantage of the dosing arrangement is that the magnitude of the dosing is determined directly digitally.
Fig. 3 shows schematically how the dosing arrangement can be used for blending two fluids in a settable fixed blending ratio. A first liquid supplied at 26 is passed through a flowmeter 27 and delivered at 28. The flowmeter is of the type generating an electrical pulse for a predetermined quantity of fluid passed. The first pulse train generated by the flowmeter 27 is given on an adjustable pulse scaler 29 which derives a second pulse train from the first pulse train, the number of pulses from the second pulse train having a fixed adjustable ratio to the number of pulses of the first pulse train.The second pulse train is compared in a pulse rate comparator 30 with a third pulse train generated by a pulse transmitter being part of the dosing unit 31, 32, 33. The pulse frequency of the third pulse train genera ted by the pulse sender 31 is proportional to the quantity of fluid per unit of time which is blended by the threaded rod/plunger/cylinder unit 33 to the first fluid at 28.By controlling the motor speed of the motor reductor combination 32 by the result of the comparison between the number of pulses of the second and third pulse trains by the pulse rate comparator 30 through motor driving control power amplifier 34 in such a way that when the second pulse train exceeds the speed of the motor increases whereas when the third pulse train exceeds the speed of the motor decreases a fixed ratio between the number of pulses of the second and third pulse trains is maintained by the control. Because said pulse trains are proportional to the quantity of the first fluid and the quantity of the second fluid per unit of time, a fixed blending ratio of the fluids is provided. The required blending ratio can be adjusted by means of the adjustable dividing ratio of the pulse scaler 29.
A simpler method for blending two liquids in a fixed adjustable ratio is shown in Fig. 4. Reference numbers of identical parts of Figs. 3 and 4 are identical. By substituting the motor, the reductor and the pulse by a stepping motor 36 the dosing arrangement 33, 36 can be driven directly through a power amplifier 35 by the second pulse train generated by the adjustable pulse scaler 29.
It should be noted that embodiments of the present dosing arrangement are feasible in which the guiding member 4 is configured as a sealing piston or in which a threaded rod is fastened to the plunger which is shifted by a nut mechanism driven by the reduction member 1 9.
Due to the generally relatively high coefficient of expansion of fluids the temperature of cylinder 1 should not vary too much if the utmost accuracy of dosing is required. If required temperature compensation can be used.
The dosing arrangement can also be used for adding a liquid to a gaseous medium by substituting the fluid flowmeter 27 by a gas flowmeter.
Claims (11)
1. A dosing arrangement for a fluid, including a cylinder having a single aperture, serving the purpose of both an inlet and an outlet for the fluid to be dosed, a plunger is movably arranged in the cylinder and extendingly sealing through one of the cylinder end walls, the plunger being provided with an extension which is guided by guide means arranged in a fixed position relative to the cylinder so as to prevent the plunger from rotating relative to the cylinder, in which the plunger from the end protruding from the cylinder has a bore not completly passing through the plunger, in which the plunger near said end has an internal thread of a diameter smaller than the diameter of the bore, in which the internal thread engages with a threaded rod which at its one end engages said internal thread and at the other side engages a bearing which bearing positions the threaded rod in the radial and longitudinal direction relative to the cylinder, and wherein the rotational position of the threaded rod is continuously variable by a driving means provided with a position indicator.
2. A dosing arrangement according to claim 1, wherein a reduction gear is arranged between the threaded rod and the driving means.
3. A dosing arrangement according to claim 1 or 2 wherein the driving member consists of an electrical or air motor and the position indicator consists of a pulse transmitter which delivers a predetermined number of pulses evenly distributed over one revolution per revolution of the driving shaft of the driving member.
4. A dosing arrangement according to claim 1 or 2, wherein the driving means which is provided with a position indicator consists of an electrical stepping motor.
5. A dosing arrangement according to claim 1 or 2, wherein the driving member consists of a hand wheel, a position indicator disc and a counter for the number of complete revolutions.
6. A dosing arrangement according to claim 3 for blending two fluids in an adjustable fixed blending ratio, wherein delivery of the first fluid is measured by a flowmeter which generates one pulse for a predetermined quantity of fluid passed, wherein said first pulse train is passed through an adjustable pulse scaler which converts the first pulse train into a second pulse train, the pulse rate of the second train having a fixed adjustable ratio to the pulse rate of the first train, whereafter the second pulse train is compared in a pulse rate comparator with the pulse rate of a third pulse train generated by the pulse transmitter on the driving shaft and in which when the pulse rate of the second pulse train exceeds the pulse rate of the third pulse train, the speed of the driving motor is increased whereas when the pulse rate of the third pulse train exceeds the pulse rate of the second pulse train, the speed of the driving motor is decreased.
7. A dosing arrangement according to claim 3 for blending two fluids in a fixed blending ratio, wherein the delivery of the first fluid is measured by a flow-meter which generates one pulse for the predetermined quantity of fluid passed, wherein said pulse train is passed through an adjustable pulse scaler which converts the first pulse train into a second pulse train, the pulse rate of said second pulse train having a fixed adjustable ratio to the pulse rate of the first pulse train, whereafter said second pulse train is used to step the stepping motor.
8. Dosing arrangement according to one of the preceding claims wherein the plunger within the cylinder is provided with a non-sealing guiding member.
9. A fluid dosing arrangement substantially as described herein with reference to Figs.1,2 and 3; or to Figs. 1, 2 and 4 of the accompanying drawings.
10. An oil-in-water meter provided with a dosing arrangement as claimed in any one of claims 1 to 9.
11. A method of calibrating a first fluid to a second fluid, which method is substantially as described herein with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7809683A NL7809683A (en) | 1978-09-25 | 1978-09-25 | DISPENSER FOR A LIQUID |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2033970A true GB2033970A (en) | 1980-05-29 |
| GB2033970B GB2033970B (en) | 1983-01-19 |
Family
ID=19831602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7933140A Expired GB2033970B (en) | 1978-09-25 | 1979-09-25 | Syringe device for calibrating oil-in-water meters |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2033970B (en) |
| NL (1) | NL7809683A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2577433A1 (en) * | 1985-02-21 | 1986-08-22 | Commissariat Energie Atomique | Apparatus for mixing a plurality of liquids |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL9202280A (en) * | 1992-12-29 | 1994-07-18 | Berg P Watertech Bv Van Den | Method and device for supplying an active substance to a carrier medium. |
-
1978
- 1978-09-25 NL NL7809683A patent/NL7809683A/en not_active Application Discontinuation
-
1979
- 1979-09-25 GB GB7933140A patent/GB2033970B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2577433A1 (en) * | 1985-02-21 | 1986-08-22 | Commissariat Energie Atomique | Apparatus for mixing a plurality of liquids |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2033970B (en) | 1983-01-19 |
| NL7809683A (en) | 1980-03-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |