CN108444562A - A kind of liquid-volume measurement apparatus - Google Patents
A kind of liquid-volume measurement apparatus Download PDFInfo
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- CN108444562A CN108444562A CN201810640368.2A CN201810640368A CN108444562A CN 108444562 A CN108444562 A CN 108444562A CN 201810640368 A CN201810640368 A CN 201810640368A CN 108444562 A CN108444562 A CN 108444562A
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- liquid
- threeway electromagnetic
- optoelectronic switch
- peristaltic pump
- spherical cavity
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- 238000005259 measurement Methods 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 230000005693 optoelectronics Effects 0.000 claims abstract description 46
- 230000002572 peristaltic effect Effects 0.000 claims abstract description 36
- 239000011521 glass Substances 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 4
- 230000005622 photoelectricity Effects 0.000 claims 1
- 239000004575 stone Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 description 25
- 238000012360 testing method Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000003149 assay kit Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F22/00—Methods or apparatus for measuring volume of fluids or fluent solid material, not otherwise provided for
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a kind of liquid-volume measurement apparatus, including peristaltic pump, at least one set of gauge assembly, gauge assembly includes diaphanometer buret, threeway electromagnetic gas valve, threeway electromagnetic liquid valve, optoelectronic switch, container, threeway electromagnetic gas valve is arranged above diaphanometer buret, threeway electromagnetic liquid valve is arranged below diaphanometer buret, optoelectronic switch is two pairs, is separately positioned on diaphanometer buret top and bottom both sides；There is a spherical cavity, spherical cavity to be located between two pairs of switches or be less than lower end optoelectronic switch on diaphanometer buret.Bubble is generated when the present invention can effectively avoid extracting liquid by spherical cavity to interfere caused by cubing, and error is greatly reduced；Stringent control rotating speed is also no longer needed based on this peristaltic pump, improves metered rate.Simultaneously can metering liquid volume as needed quantity, matched with a peristaltic pump using one or more threeway electromagnetic gas valves, threeway electromagnetic liquid valve, greatly reduce the usage quantity of peristaltic pump.
Description
Technical field
The invention belongs to liquid meter technical fields, are related to a kind of liquid-volume measurement apparatus.
Background technology
In recent years, with the implementation energetically of " river length system ", water environment pollution problem receives the great attention of governments at all levels,
Therefore being monitored to the polluter in water environment seems particularly significant.Although the accuracy of laboratory manual analysis method is high,
But it needs field sampling and takes back laboratory progress manual analyzing, time-consuming for analytic process, complicated for operation.
Water quality online analyzer uses more and more extensive, the accuracy of liquid sample amount in monitoring water environment field at present
It is to determine the very important link of water quality online analyzer monitoring precision.From realizing in terms of angle, mainly there is wriggling pump-metered side
Two kinds of formula and step motor control syringe pump metering method.Wriggling pump mode is widely used in various Water Test Kits, but wriggles
The hose of pump during use due to repeatedly extruded so that its be easy aging deformation, the liquid in addition measured if it is
It is easier to lead to its reduced service life when strong acid, highly basic or the strong liquid of oxidisability, it is therefore desirable to regularly replace peristaltic pump
Hose, this considerably increases the maintenance costs of instrument.Although step motor control syringe pump measures essence come the mode measured
Degree is high, but injecting unit abrasion is very fast, and sample injection pipeline is more complicated, and when cleaning is more difficult, once in sample injection system
Air is sucked, generally more difficult complete exclusion can cause the inaccuracy of sample introduction, in addition syringe pump expensive, disadvantage mentioned above
Limit its further genralrlization application.
Applicant early period is in patent《A kind of Water quality ammonia nitrogen in-line analyzer》(grant number：ZL201720014003.X it is carried in)
The photoelectric metering mode that the liquid volume metering arrived uses, not only measuring accuracy is high, but also cheap, has good effect
The shortcomings that fruit, but it is using isometrical diaphanometer buret, this metering method, is to need strictly to control turning for peristaltic pump
Speed can interfere metering once generating bubble in pipeline is not easy Natural Ruptures, cause metering inaccurate.
Invention content
To solve the above problems, the invention discloses a kind of liquid-volume measurement apparatus, only pass through a peristaltic pump and one
A or multiple threeway electromagnetic liquid valves, threeway electromagnetic gas valve connect with one or more sample intake passage, and use more structurally sound
Infrared electro metering method more crucially devises a spherical cavity in diaphanometer buret.
In order to achieve the above object, the present invention provides the following technical solutions：
A kind of liquid-volume measurement apparatus, including peristaltic pump, at least one set of gauge assembly, the gauge assembly includes transparent
Gauge line, threeway electromagnetic gas valve, threeway electromagnetic liquid valve, optoelectronic switch, container, the threeway electromagnetic gas valve are arranged in transparent meter
Above pipe, the threeway electromagnetic liquid valve is arranged below diaphanometer buret, and optoelectronic switch is two pairs, is separately positioned on transparent meter
Pipe top and bottom both sides；Peristaltic pump is connect with threeway electromagnetic gas valve by wriggling pump hose, diaphanometer buret upper end and threeway
Electromagnetic gas valve, lower end are connected with threeway electromagnetic liquid valve, and threeway electromagnetic liquid valve is connect by pipeline with container；Each optoelectronic switch output
Signal to controller, the peristaltic pump, threeway electromagnetic gas valve, threeway electromagnetic liquid valve, each optoelectronic switch has electricity with controller
Connection, controller are powered simultaneously for controlling peristaltic pump, threeway electromagnetic gas valve and threeway electromagnetic liquid valve, each optoelectronic switch by controller
To controller output signal；There is a spherical cavity, the spherical cavity to be located between two pairs of switches or low on diaphanometer buret
In lower end optoelectronic switch.
Further, the inside radius ratio range of the cylinder and spherical cavity is 5~25.
Further, the inside radius of diaphanometer buret cylindrical portion ranging from 1mm~5mm.
Further, the inside radius of spherical cavity part ranging from 8mm~25mm.
Further, the range of flow of the peristaltic pump is 10mL/min~100mL/min.
Further, the transparent meter tubing matter is quartz, simple glass or organic glass.
Further, the optoelectronic switch is infrared type optoelectronic switch, including light emitting end and optical receiving end.
Compared with prior art, the invention has the advantages that and advantageous effect：
Bubble is generated when it is possible to prevente effectively from extracting liquid to volume by the spherical cavity designed in diaphanometer buret
Interference, is greatly reduced error caused by measurement；Stringent control rotating speed is also no longer needed based on this peristaltic pump, improves metering
Speed.Meanwhile can metering liquid volume as needed quantity, using one or more threeway electromagnetic gas valves, threeway electromagnetism
Liquid valve is matched with a peristaltic pump, greatly reduces the usage quantity of peristaltic pump.
Description of the drawings
Fig. 1 is to implement a liquid-volume measurement apparatus structural schematic diagram provided, and wherein spherical cavity is arranged in gauge line
Lower end, for measuring less liquid.
Fig. 2 is to implement a liquid-volume measurement apparatus structural schematic diagram provided, and wherein spherical cavity is arranged in gauge line
Between the optoelectronic switch of two pairs of middle part, for measuring more liquid.
Fig. 3 is to implement the two liquid-volume measurement apparatus structural schematic diagrams provided, and wherein spherical cavity is arranged in gauge line
Lower end, for measuring less liquid.
Fig. 4 is to implement the two liquid-volume measurement apparatus structural schematic diagrams provided, and wherein spherical cavity is arranged in gauge line
Between the optoelectronic switch of two pairs of middle part, for measuring more liquid.
Fig. 5 is electronic component connection diagram in one device of embodiment.
Fig. 6 is electronic component connection diagram in embodiment two devices.
Reference sign：
A- peristaltic pumps, B- threeway electromagnetic gas valves, C：Diaphanometer buret, D：Photoelectric infrared switch, wherein D-1 are light emitting
End, D-2 is optical receiving end, E：Threeway electromagnetic liquid valve, F：Liquid bottles.
Specific implementation mode
Technical solution provided by the invention is described in detail below with reference to specific embodiment, it should be understood that following specific
Embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.
Embodiment one：Measure a kind of liquid volume
As shown in Figure 1, this example measures a kind of liquid of smaller size smaller, device includes peristaltic pump A and a Sets of Measurement component, meter
Amount component includes diaphanometer buret C, the threeway electromagnetic gas valve B that is arranged above diaphanometer buret C, is arranged in diaphanometer buret C
The threeway electromagnetic liquid valve E of lower section, be arranged diaphanometer buret top and bottom both sides two couples of optoelectronic switch D, with threeway electromagnetism
The liquid bottles F of liquid valve connection；Peristaltic pump A is connect with threeway electromagnetic gas valve B by wriggling pump hose, the diaphanometer upper ends buret C with
Threeway electromagnetic gas valve B, lower end are connected with threeway electromagnetic liquid valve E, and threeway electromagnetic liquid valve E is connect by pipeline with liquid bottles F.Each light
Electric switch D outputs signal to controller indirect control threeway electromagnetic gas valve and threeway electromagnetic liquid valve, peristaltic pump A, threeway electromagnetism gas
Valve B, threeway electromagnetic liquid valve E, each optoelectronic switch D, which have with controller, to be electrically connected, and controller works for controlling peristaltic pump A,
Each optoelectronic switch D is powered from controller and to controller output signal, and optoelectronic switch both ends apply voltage, the voltage finally generated
The break-make of skip signal indirect control threeway electromagnetic gas valve and threeway electromagnetic liquid valve.There is a spherical cavity on diaphanometer buret C,
In gauge line end side on the lower side, two couples of Photoelectric infrared switch D are fixed on spherical cavity for spherical cavity design in diaphanometer buret C
End, volume size can be calculated according to spherical cavity radius size：
The volume of diaphanometer buret cylindrical portion can be calculated by following formula：
VCylinder=π .R2.h (2)
Specifically, diaphanometer buret is vertically-mounted, suitable position need to be selected solid according to the size of metering liquid volume
Determine optoelectronic switch.Controller is PLC or microcontroller.Optoelectronic switch is infrared type optoelectronic switch, including light emitting end and light connects
Receiving end.Optoelectronic switch is fixed on vertically on diaphanometer buret.Transparent meter tubing matter is quartz, simple glass or organic glass
Glass.
The range of flow of peristaltic pump is 10mL/min~100mL/min, and it is 1~24V that optoelectronic switch both ends, which apply voltage, often
Include light emitting end D-1 and optical receiving end D-2 to optoelectronic switch.The inside radius of diaphanometer buret cylindrical portion is ranging from
1mm~5mm, inside radius ranging from 8mm~25mm of spherical cavity part, the inside radius ratio range of cylinder and spherical cavity
It is 5~25.
For the liquid meter of smaller size smaller, the metering of liquid and the volume size of spherical cavity are unrelated, only and cylinder
The distance h of partial radius R and two optoelectronic switches is related, therefore selects the spherical cavity of correct radial.Start to measure
When, threeway electromagnetic gas valve B is opened, and corresponding threeway electromagnetic liquid valve E is opened close to the sides liquid bottles F below diaphanometer buret C, compacted
Dynamic pump A rotates clockwise to form negative pressure so that liquid is pumped in corresponding diaphanometer buret C, when liquid flows to transparent meter
The voltage instantaneous at the both ends optoelectronic switch D can be caused to reduce when the optoelectronic switch positions D of the upper ends pipe C.Optoelectronic switch D is defeated by this signal
It is sent in controller then controller to close the corresponding channels threeway electromagnetic gas valve B, at this moment peristaltic pump A stops operating.It connects down
Come, controller control peristaltic pump A is rotated counterclockwise, and threeway electromagnetic gas valve B is again turned on, and liquid flows to corresponding diaphanometer buret C
When the position of lower end optoelectronic switch D, the voltage at the both ends optoelectronic switch D reduces again.At this point, corresponding threeway electromagnetic gas valve B is logical
Road is closed, and at this moment peristaltic pump A stops operating, and the amount of liquid between two optoelectronic switch D is institute's metering liquid volume size.
When needing to measure large volume of liquid, as shown in Fig. 2, the spherical cavity in diaphanometer buret C need to be designed
In the centre of diaphanometer buret C, two optoelectronic switch D are fixed on spherical cavity both sides, according to the big of required metering liquid volume
Small to select suitable spherical cavity radius, cylindrical portion radius is moderate, the meter of all operating conditions and smaller liquid volume
Amount mode is identical.
Embodiment two：Measure plurality of liquid volume
As shown in figure 3, this example measures a variety of smaller liquid volumes, by taking three kinds of liquid as an example.This example device includes peristaltic pump A
With three Sets of Measurement components, often composed structure is same as Example 1 in Sets of Measurement component, and parameter setting is also same as Example 1.Thoroughly
In the end sides on the lower side diaphanometer buret C, optoelectronic switch D is fixed on above spherical cavity for spherical cavity design in bright gauge line C.It opens
When beginning to measure, three threeway electromagnetic gas valve B are opened, and corresponding threeway electromagnetic liquid valve E is close to liquid bottles F below diaphanometer buret C
Side is opened, and peristaltic pump A rotates clockwise to form negative pressure so that liquid is pumped in corresponding diaphanometer buret C, works as liquid flow
The voltage instantaneous at the both ends optoelectronic switch D can be caused to reduce when to the upper ends the diaphanometer buret C optoelectronic switch positions D.Optoelectronic switch D will
This signal is transported to the threeway electromagnetic gas valve B in this channel so that corresponding channel is closed.Then successively extract second and
Third liquid, when third liquid is pumped to the corresponding upper ends the diaphanometer buret C optoelectronic switch positions D, threeway electromagnetism gas
Valve B is closed in all channels, and at this moment peristaltic pump A stops operating.Next, controller control peristaltic pump A is rotated counterclockwise, three three
Logical electromagnetic gas valve B is fully open, when liquid flows to the position of the respective lower ends diaphanometer buret C optoelectronic switch D, optoelectronic switch D two
The voltage at end reduces again.At this point, corresponding threeway electromagnetic gas valve channel B is closed, to the last a liquid flows to corresponding saturating
When the position of the lower ends bright gauge line C optoelectronic switch D, threeway electromagnetic gas valve B is closed in all channels, and at this moment peristaltic pump A stops operating.
When measuring a variety of large volume of liquid, the spherical cavity in diaphanometer buret C is arranged in diaphanometer buret C
Centre, as shown in figure 4, selecting suitable spherical cavity radius, cylinder portion according to the size of required metering liquid volume
Divide radius moderate, other conditions are constant.
Due to, containing there are one spherical cavity, need not strictly control the rotating speed of peristaltic pump A in diaphanometer buret C, and
It is that three channels work at the same time, substantially increases the metered rate of liquid, shorten the time of whole detection, and do not do mutually
It disturbs.
In pervious device, in diaphanometer buret do not have spherical cavity, when transparent meter bore be 4mm, in order to keep away
Exempt from bubble generation, wriggling pump discharge is no more than 9.6mL/min；When it is 3mm to measure bore, wriggling pump discharge is no more than
7.2mL/min completes 1mL meterings and needs 2 minutes or so.
Several groups of implementation data are listed below, the good result that device reaches is further illustrated the present invention.
Using Fig. 1 shown devices in the present invention, diaphanometer buret cylindrical portion internal diameter is 3mm, the internal diameter of spherical cavity
For 24mm when (wall thickness is 1.5mm, similarly hereinafter), measure 1mL liquid when, two optoelectronic switches are fixed on spherical cavity upper end one
Side, distance are 14.15cm, and when setting wriggling pump discharge is 10mL/min, the primary metering of completion only takes 70s, follow-on test 25
It is secondary, Mean metered dose error 0.09%.When setting wriggling pump discharge is 20mL/min, the primary metering of completion only takes 43s, continuous survey
Examination 25 times, Mean metered dose error 0.10%.When setting wriggling pump discharge is 50mL/min, the primary metering of completion only takes 19s, together
Sample follow-on test 25 times, Mean metered dose error 0.12%.When setting wriggling pump discharge is 100mL/min, the primary metering of completion is only
Take 12s, same follow-on test 25 times, Mean metered dose error 0.14%.
Using Fig. 2 shown devices in the present invention, diaphanometer buret cylindrical portion internal diameter is 3mm, the internal diameter of spherical cavity
For 24mm when, measure 8mL liquid when, two optoelectronic switches are fixed on diaphanometer buret spherical cavity both sides, and distance is
13.48cm, when setting wriggling pump discharge is 50mL/min, the primary metering of completion only takes 18s, follow-on test 25 times, average meter
Measure error -0.09%.When setting wriggling pump discharge is 100mL/min, the primary metering of completion only takes 11s, same follow-on test
25 times, Mean metered dose error 0.14%.
Using Fig. 1 shown devices in the present invention, diaphanometer buret cylindrical portion internal diameter is 2mm, the internal diameter of spherical cavity
For 25mm when, when measuring 1mL liquid, when setting wriggling pump discharge is 10mL/min, completes primary metering and take 82s, it is continuous to survey
Examination 25 times, Mean metered dose error -0.08%.When setting wriggling pump discharge is 50mL/min, the primary metering of completion only takes 22s,
Same follow-on test 25 times, Mean metered dose error 0.05%.When setting wriggling pump discharge is 100mL/min, the primary metering of completion
Only take 14s, same follow-on test 25 times, Mean metered dose error 0.12%.
Using Fig. 1 shown devices in the present invention, diaphanometer buret cylindrical portion internal diameter is 4mm, the internal diameter of spherical cavity
For 16mm when, when measuring 1mL liquid, when setting wriggling pump discharge is 10mL/min, completes primary metering and take 38s, it is continuous to survey
Examination 25 times, Mean metered dose error -0.08%.When setting wriggling pump discharge is 50mL/min, the primary metering of completion only takes 11s,
Same follow-on test 25 times, Mean metered dose error 0.05%.When setting wriggling pump discharge is 100mL/min, the primary metering of completion
Only take 6s, same follow-on test 25 times, Mean metered dose error 0.10%.
Using Fig. 2 shown devices in the present invention, diaphanometer buret cylindrical portion internal diameter is 5mm, the internal diameter of spherical cavity
For 25mm when, when measuring 10mL liquid, when setting wriggling pump discharge is 50mL/min, completes primary metering and only take 28s, equally
Follow-on test 25 times, Mean metered dose error 0.12%.When setting wriggling pump discharge is 100mL/min, the primary metering of completion only consumes
When 15s, same follow-on test 25 times, Mean metered dose error 0.15%.
As it can be seen that population mean measurement error is tested above no more than ± 0.15%, and the stereometer of common peristaltic pump at present
Error is measured ± 0.5% or so, the volume metering error of syringe pump is ± 0.3% or so, it can be seen that liquid bulk of the invention
Product measuring accuracy is substantially better than the existing liquid-volume measurement apparatus using peristaltic pump and syringe pump.
The technical means disclosed in the embodiments of the present invention is not limited only to the technological means disclosed in the above embodiment, further includes
By the above technical characteristic arbitrarily the formed technical solution of combination.It should be pointed out that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (7)
1. a kind of liquid-volume measurement apparatus, it is characterised in that：Including peristaltic pump, at least one set of gauge assembly, the metering group
Part includes diaphanometer buret, threeway electromagnetic gas valve, threeway electromagnetic liquid valve, optoelectronic switch, container, the threeway electromagnetic gas valve setting
Above diaphanometer buret, the threeway electromagnetic liquid valve is arranged below diaphanometer buret, and optoelectronic switch is two pairs, is respectively set
In diaphanometer buret top and bottom both sides；Peristaltic pump is connect with threeway electromagnetic gas valve by wriggling pump hose, diaphanometer buret
Upper end is connected with threeway electromagnetic gas valve, lower end with threeway electromagnetic liquid valve, and threeway electromagnetic liquid valve is connect by pipeline with container；Each light
Electric switch outputs signal to controller, the peristaltic pump, threeway electromagnetic gas valve, threeway electromagnetic liquid valve, each optoelectronic switch with control
Utensil processed has electrical connection；There is a spherical cavity, the spherical cavity to be located between two pairs of switches or be less than on diaphanometer buret
Lower end optoelectronic switch.
2. liquid-volume measurement apparatus according to claim 1, it is characterised in that：The cylinder and spherical cavity it is interior
Radii ratio ranging from 5~25.
3. liquid-volume measurement apparatus according to claim 1, it is characterised in that：Diaphanometer buret cylindrical portion it is interior
Radius is 1mm~5mm.
4. liquid-volume measurement apparatus according to claim 1, it is characterised in that：The inside radius range of spherical cavity part
For 8mm~25mm.
5. liquid-volume measurement apparatus according to claim 1, it is characterised in that：The range of flow of the peristaltic pump is
10mL/min~100mL/min.
6. liquid-volume measurement apparatus according to claim 1, it is characterised in that：The transparent meter tubing matter is stone
English, simple glass or organic glass.
7. liquid-volume measurement apparatus according to claim 1, it is characterised in that：The optoelectronic switch is infrared type photoelectricity
Switch, including light emitting end and optical receiving end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810640368.2A CN108444562B (en) | 2018-06-21 | 2018-06-21 | Liquid volume metering device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810640368.2A CN108444562B (en) | 2018-06-21 | 2018-06-21 | Liquid volume metering device |
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| CN108444562B CN108444562B (en) | 2023-12-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111855891A (en) * | 2020-07-27 | 2020-10-30 | 水利部南京水利水文自动化研究所 | Water quality permanganate index online analyzer and detection method thereof |
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