CN105890713A - Flowmeter calibration system - Google Patents
Flowmeter calibration system Download PDFInfo
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- CN105890713A CN105890713A CN201410733918.7A CN201410733918A CN105890713A CN 105890713 A CN105890713 A CN 105890713A CN 201410733918 A CN201410733918 A CN 201410733918A CN 105890713 A CN105890713 A CN 105890713A
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Abstract
The invention relates to the field of flowmeter calibration systems. A mobile flexible flowmeter calibration system comprises a flow pump group including three flow pumps, a flowmeter group including two flowmeters and a data analysis and control device; the flow pump group supplies needed standard flow, and the flow passes through the flowmeter group and then flows into a calibrated flowmeter; the data analysis and control device transmits the instantaneous flow and accumulated flow of the standard flowmeters and control information of the pumps and finally completes metering detection on the calibrated flowmeter. According to the mobile flexible flowmeter calibration system, flowmeter calibration can be conducted automatically, accurately and quickly on site, and different flowmeters within the large range can be detected. In addition, when the flowmeter is calibrated, a calibration medium is cyclically used through the action of the pumps, and therefore resources are saved.
Description
Technical field
The present invention relates to flowmeter calibration system field.
Background technology
The calibration of flowmeter is mainly had two indexs: 1, flowmeter flow elementary error calibration, both flowmeter full scale (kg/h) 20%,
50%, integrated flow (kg) calibration of 90% 3 calibration point；2, flowmeter output electric current elementary error calibration, i.e. with three traffic alignment
The calibration of flowmeter output electric current (mA) that point is corresponding.Owing to the instantaneous delivery of the most online flowmeter uploads mode (being uploaded to PLC) mainly
Being realized by the output electric current (4-20mA) of flowmeter, therefore the output correcting current to flowmeter is a considerable project.When
So, the present invention provides fieldbus form to realize uploading by school flowmeter instantaneous delivery the most simultaneously.It addition, for current cigarette factory,
Online flowmeter quantity is many, and specification is many, from the charging of the perfuming flow of minimum 20kg/h to maximum 500kg/h, adds discharge, therefore exists
To consider during design discharge calibrating installation to cover this scope above, make the calibration range of this device have certain flexibility.
The theory diagram of existing flowmeter calibrating installation is as it is shown in figure 1, it will be seen that original flowmeter calibrating installation from this figure
Although fairly simple in configuration, but there is following problem:
1 degree of accuracy is relatively poor: during calibration, and the flow of each calibration point is to be obtained by manual adjustment valve, when extraneous hydraulic pressure ripple
Move and change, will result in calibrated fluxes actual value and fluctuate the biggest with setting flow (SP) deviation greatly.Additionally stream instantaneous with calibration point
Output electric current corresponding to amount also can change, therefore with a standard amperemeters read electric current in constantly fluctuation be one very
The thing of difficulty, nor can be accurately.This is by measuring the calibration error that environment causes.
2 can not calibrate online, because only flow generation water tower is exactly a huge monster, it is impossible to mobile.
3 take material: as a example by the flowmeter of a 500kg/h, if calibration All going well, calibrate 3 points, at least need to use water resource
Or other fluid resources more than 100 kilogram.
4 is time-consuming, laborious: calibrating a flowmeter and need three people, the average calibration time is about three hours.
Summary of the invention
The purpose of the present invention is contemplated to solve problem above, it is provided that the flexibility flowmeter calibration system of a kind of movable type.
The design of the present invention is as follows: the flexibility calibration of the continuous flow scope that obtains for convenience, uses two quality streams differed in size
Gauge composition flowmeter group is used for flow detection and three ground flow pump composition flow pump groups that differ in size are used as flow.In order to
Each traffic alignment point obtains stable flow, uses PID automatic tracking technology, solve the past by during manual adjustment valve opening because of the external world
Water pressure fluctuations causes the phenomenon that calibrated fluxes is unstable.In order to the electric current index of flowmeter is calibrated, PLC export by school flowmeter
Current sample automatically sample and be averaged value calculate, solve the problem estimating reading with ammeter measurement.Theory diagram is shown in Fig. 2.
Flowmeter calibration system of the present invention, including proving flowmeter with by school flowmeter, proving flowmeter is by two flowmeter groups
The flowmeter group become；Additionally this calibration system also includes the flow pump group of three flow pumps, the container equipped with circulatory mediator, PLC control
Cabinet and computer；Wherein, flow pump group, flowmeter group, by school flowmeter and equipped with circulatory mediator container form loop, flow pump group,
Flowmeter group and being all connected with PLC control cabinet and computer by network-bus by school flowmeter.
Normal flow needed for the offer of flow pump group is by flowing into after flowmeter group by school flowmeter, data analysis and control device by PLC again
Switch board, computer, grid line etc. form, data analysis and control device to instantaneous delivery, integrated flow and the pump of proving flowmeter
Control information is transmitted, and is finally completed by the gauge check of school flowmeter.
Portable flexibility flowmeter calibration system of the present invention carries out modularized design, volume and traditional flowmeter calibration system phase
Ratio is much smaller, transports and stores all very convenient, can all concentrate and be placed on a moveable small handcart or other means of transport.When
When online flowmeter is calibrated, as long as calibration personnel moves calibration scene to calibration system can carry out Site Detection.
In use, its calibration medium is irretrievable to existing flowmeter calibrating installation.As calibrated the flow of a full scale 500kg/h
Meter, integrated flow display resolution is the flowmeter of 0.1kg, if all are the most smooth, then the water consumed in calibration will no less than 100kg,
And flexibility flowmeter calibration system of the present invention, as long as the generation of flow enters to calibrate medium at bucket or other container content, pass through
The effect of pump group makes calibration medium flow through flowmeter group after pump group exports and inputs calibrating flow meter, the calibration medium of proving flowmeter output again
Take in again equipped with calibration medium container in for generation flow, be so repeatedly circulated, consumption is zero, is conducive to economizing on resources.
In portable flexibility flowmeter calibration system of the present invention, flow pump group contains three flow pumps, is connected in parallel to provide big model
The continuous flow enclosed, and each flow pump has different ranges.From the point of view of the serviceability of flow pump, the optimal use point amount of being
More than the 70% of journey, from this point, sets up an automatic distribution system of multichannel flow, makes them can be operated in a preferable region,
Thus it is adapted to the regime flow needed for the flexibility calibration of continuous flow scope from small to large.
In portable flexibility flowmeter calibration system of the present invention, flowmeter group contains two flowmeters, is connected in parallel to accommodate big model
The flow enclosed, and each flowmeter has different flows and the optimum measurement sensitive flow scope corresponding to relatively low error.
For ensureing the calibration accuracy of flowmeter, in system, the flow measurement accuracy of measurement of flowmeter group should meet ± 0.1%.
Data analysis and control device are made up of PLC control cabinet, computer, grid line etc..Stream is completed by data analysis and control device
The task of the automatic distribution system of multichannel flow of amount pump group, i.e. data analysis and control device instructs flow pump group, flowmeter group so that it is
It is applied in combination on optimal use point, the flow needed for output.
Flow pump group, flowmeter group and all provided flow measurement to believe to data analysis and the cpu controller controlled in device by school flowmeter
Number, controller opens and closes and guides each automatically operated valve with by by optimal corresponding to relatively low error of each flowmeter
Measure in the range of sensitivity.Measurement and the control information of system all digitize, by network technology to the instantaneous delivery of proving flowmeter,
The control information of integrated flow and pump is transmitted, and makes the transmission of the analog information of system realize free-error transmission.
The self calibration of system is a function the most crucial, when system carries out self calibration, and an additional balance, utilize conventional method to carry out
Verification, the used time does not pulls down.Practical operation can be automatically performed by program-guide.
When online flowmeter is calibrated, as long as calibration personnel moves portable flexibility flowmeter calibration system of the present invention to
Calibration scene, and water pipe is inserted two-position three way valve, output electric current accesses in calibration system, then inputs flow meter number to be calibrated,
Just can calibrate by the instantaneous delivery of school flowmeter, integrated flow and output electric current automatically by calibration code.Final system can also be certainly
Dynamic error calculation that each calibration data is carried out, and judge whether qualified.
Beneficial effects of the present invention: use portable flexibility flowmeter calibration system of the present invention, can make flowmeter calibration scene
Change, automation, accuracy and rapid, and large range of various flows gauge can be detected.It addition, fixed to flowmeter
Timestamp makes calibration medium circulation use by the effect of pump and has saved resource.
Accompanying drawing explanation
Fig. 1 is the theory diagram of existing flowmeter calibrating installation.
Fig. 2 is movable type flexibility flowmeter calibration system calibrating principle block diagram of the present invention.PC, PLC, flow pump group, flowmeter group and
It is connected with network-bus respectively by school flowmeter.
Fig. 3 is flowmeter group and flow pump group annexation figure in movable type flexibility flowmeter calibration system of the present invention.
Fig. 4 is the operation figure of movable type flexibility flowmeter calibration system of the present invention.
Detailed description of the invention
It is clearly understood to make present disclosure be easier to, below according to specific embodiment and combine accompanying drawing, the present invention is made into one
Step detailed description.
Do flow by bucket loading suitable quantity of water to use.As it is shown on figure 3, traffic ingress 1 one end enters bucket, the other end is sequentially connected with pressure regulation
Valve 2, Pressure gauge 3, magnetic valve 4 and No. 1 flow pump 5.Calibration WATER AS FLOW MEDIUM passes through safety valve 7, pulsation damper after flow pump 5
6 and counterbalance valve 9, equipped with Pressure gauge 8 between pulsation damper 6 and counterbalance valve 9.The present embodiment is chosen size and is respectively 50L/h's
No. 1 flow pump 5, No. 3 flow pumps 11 of No. 2 flow pumps 10 and 355L/h of 126L/h, be connected in parallel as shown in Figure 3, produce steady
Enter No. 1 flowmeter 13 and No. 2 flowmeters 14 after fixed flow, pass through from the water of No. 1 flowmeter 13 and No. 2 flowmeter 14 outputs
Enter by school flowmeter 15 after respective reversing valve 12.In the present embodiment, choose two flowmeters differed in size, respectively 0～100kg/h
No. 2 flowmeters 14 of No. 1 flowmeter 13 and 0～450kg/h, its precision is ± 0.1%, is the most also connected in parallel, group
Become flowmeter group, export calibrated fluxes by reversing valve.Calibrated fluxes input is sent into initially further through pipeline after being completed task by school flowmeter
For occur flow the bucket equipped with water.So recycle, saved resource.As in figure 2 it is shown, equipped with PLC control in system
Cabinet and computer, be connected with flow pump group and flowmeter group by netting twine, uses instantaneous to proving flowmeter of PROFIBUS network technology
The control information of flow, integrated flow and pump is transmitted, it is achieved the automatic distribution of flow.
Using the flowmeter calibration system described in the present embodiment in actual applications, operate as shown in Figure 4, the computer of calibration system is done
One calibration form as follows:
Flowmeter adds up calibrator quantity: 10.000kg substantially；
Flowmeter adds up the minimum resolution of indicator: 0.1；
One, elementary error is calibrated by check and punctuate (kg/h) standard indicating value (kg) flowmeter indicating value (kg) elementary error
(%) 0 0.000 0.000 0.000 99.994 10.000 9.958-0.422 250.011 10.005 10.012 0.069
450.494 10.006 10.024 0.176；
Two, output electric current elementary error is calibrated by check and punctuate (kg/h) nominal current value (mA) output current value (mA) elementary error
(%) 0 4.000 3.987-0.320 99.994 7.200 7.175-0.342 250.011 12.000 11.960-0.338
450.494 18.416 18.381-0.191:
Three, calibration result calibration item actual maximum permissible value elementary error (%)-0.422 1.500 output electric current is basic
Error (%)-0.342 1.500；
Four, conclusion: qualified.
Above one embodiment of the present of invention is described in detail, but described content has been only presently preferred embodiments of the present invention, it is impossible to recognized
For the practical range for limiting the present invention.All impartial changes made according to the present patent application scope and improvement etc., all should still belong to this
Within bright patent covering scope.
Claims (4)
1. a flowmeter calibration system, including proving flowmeter with by school flowmeter, it is characterised in that: proving flowmeter is by two flows
The flowmeter group of meter composition；Additionally this calibration system also includes the flow pump group of three flow pumps, the container equipped with circulatory mediator, PLC
Switch board and computer；Wherein, flow pump group, flowmeter group, by school flowmeter and equipped with circulatory mediator container form loop, flow
Pump group, flowmeter group and be all connected with PLC control cabinet and computer by network-bus by school flowmeter.
2. flowmeter calibration system as claimed in claim 1, it is characterised in that this system also includes a moveable small handcart or other fortune
On defeated instrument, other parts are placed on small handcart or other means of transport.
3. flowmeter calibration system as claimed in claim 1, it is characterised in that three flow pumps of flow pump group are connected in parallel, and
Range varies in size.
4. flowmeter calibration system as claimed in claim 1, it is characterised in that two flowmeters of flowmeter group are connected in parallel, and
And range varies in size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410733918.7A CN105890713A (en) | 2014-12-03 | 2014-12-03 | Flowmeter calibration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410733918.7A CN105890713A (en) | 2014-12-03 | 2014-12-03 | Flowmeter calibration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105890713A true CN105890713A (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410733918.7A Pending CN105890713A (en) | 2014-12-03 | 2014-12-03 | Flowmeter calibration system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404272A (en) * | 2016-11-21 | 2017-02-15 | 浙江福立分析仪器股份有限公司 | High-pressure infusion pump pressure buffer sensor and pressure buffer method |
| CN106768209A (en) * | 2017-02-17 | 2017-05-31 | 中国石油化工股份有限公司 | Oil well watering digital flowmeter calibrator (-ter) unit and method |
| CN109099996A (en) * | 2018-09-13 | 2018-12-28 | 苏州市计量测试院 | A kind of minute gas flowmeter calibrating installation |
| CN110954190A (en) * | 2019-12-20 | 2020-04-03 | 中国石油化工股份有限公司 | Online calibrator and calibration method for oil field high-pressure water injection well flowmeter |
| CN111060342A (en) * | 2019-12-30 | 2020-04-24 | 3M材料技术（广州）有限公司 | System and method for calibrating a functional module of a water treatment device |
-
2014
- 2014-12-03 CN CN201410733918.7A patent/CN105890713A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404272A (en) * | 2016-11-21 | 2017-02-15 | 浙江福立分析仪器股份有限公司 | High-pressure infusion pump pressure buffer sensor and pressure buffer method |
| CN106404272B (en) * | 2016-11-21 | 2022-03-18 | 浙江福立分析仪器股份有限公司 | Pressure buffering sensor and pressure buffering method for high-pressure infusion pump |
| CN106768209A (en) * | 2017-02-17 | 2017-05-31 | 中国石油化工股份有限公司 | Oil well watering digital flowmeter calibrator (-ter) unit and method |
| CN109099996A (en) * | 2018-09-13 | 2018-12-28 | 苏州市计量测试院 | A kind of minute gas flowmeter calibrating installation |
| CN109099996B (en) * | 2018-09-13 | 2024-05-28 | 苏州市计量测试院 | Calibrating device for micro gas flowmeter |
| CN110954190A (en) * | 2019-12-20 | 2020-04-03 | 中国石油化工股份有限公司 | Online calibrator and calibration method for oil field high-pressure water injection well flowmeter |
| CN111060342A (en) * | 2019-12-30 | 2020-04-24 | 3M材料技术（广州）有限公司 | System and method for calibrating a functional module of a water treatment device |
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Application publication date: 20160824 |