CN1304825C - Volume flow measuring method - Google Patents
Volume flow measuring method Download PDFInfo
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- CN1304825C CN1304825C CNB2005100233642A CN200510023364A CN1304825C CN 1304825 C CN1304825 C CN 1304825C CN B2005100233642 A CNB2005100233642 A CN B2005100233642A CN 200510023364 A CN200510023364 A CN 200510023364A CN 1304825 C CN1304825 C CN 1304825C
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Abstract
The present invention discloses a volume type flow measurement method, which is characterized in that the present invention is suitable for one or a plurality of volume pools and is provided with one or a plurality of pumps to extract flowing medium from the volume pools; the flow of flowing in and out is precisely measured by calibrating the curve of the flow of the pumps and measuring the liquid level. The present invention comprises the steps: the volume of the volume pools is measured; the lift of the pumps and the curve of the flow are calibrated; the power of the pumps and the curve of the flow are calibrated; the flow is calculated. The present invention has the advantages that the present invention used for a long term has high precision; the lift of the pumps and the curve of the flow are recalibrated when site conditions are changed; any additional measurement equipment does not need to be used; requirements for site conditions and operators are low; the processes of verifying the flow precision of the present invention and calibrating the pumps are synchronous; the calibration and the verification can be performed at any time in the process of use so as to simplify the processes of measurement and verification; the cost for purchasing special flow measurement equipment is greatly saved; the procedure of measurement is convenient to integrate in automatic monitoring systems of the pumps simultaneously; the maintenance is simple.
Description
Technical field
The present invention relates to a kind of volume flow measuring method, be applicable to one or more fixed volume pond, and there are one or more pumps therefrom to extract flow media, by calibration pump discharge curve and measuring liquid level, a series of compensation corrections, and the accurate volume flow measuring method of measuring the flow that flows into and flow out.
Background technology
In urban water supply and sewerage and some industrial intermediate liquid, discharging of waste liquid, need know fluid flow usually, produced needs thus to flow measurement, relatively more commonly used at present have electromagnetic flowmeter and a ultrasonic flow meter.Electromagnetic flowmeter: be to utilize water at ducted cutting magnetic field, produce induced potential, its big or small principle that is directly proportional with cutting speed is measured the mean flow rate of water outlet, thereby is reached the purpose of measurement.Ultrasonic flow meter utilizes the flow velocity of water to change hyperacoustic transmission speed or frequency characteristic, and by the time difference or the frequency difference that detects ultrasonic transmission speed, thereby the mean flow rate of reflection water outlet reaches the purpose that flow water measures.These two kinds of flow measurement instrument advantages are, the precision height, and antijamming capability is stronger; But price is expensive, and the mounting condition at scene is required than higher, and on-site proving need be undertaken by professional and professional equipment, operating personnel is required height, the maintenance cost height.And in the intermediate link of urban water supply and sewerage and some industrial intermediate liquid, discharging of waste liquid, often less demanding to the measuring accuracy of flow, it requires to measure flow mostly is management or statistical needs, rather than the needs of accurate measurement.In this case, use professional flow measurement instrument just not only to exceed client's needs, and take high.The positive displacement liquid flow-measuring method need be developed for this class, and measuring accuracy does not need to use any special flow measuring equipment less than 5%, and implementation cost adopts professional flow measurement instrument greatly to reduce relatively.Be specially adapted to the flow measurement of city pumping plant, some industrial intermediate liquid, process liquids discharging.
Summary of the invention
The objective of the invention is to use the price of electromagnetic flowmeter and ultrasonic flow meter expensive in order to overcome in the existing volume flow measuring, mounting condition to the scene requires than higher, on-site proving need be undertaken by professional and professional equipment, operating personnel are required height, the shortcoming that maintenance cost is high, provide a kind of, need only the volume flow measuring method that just can accurately measure instantaneous delivery and integrated flux by correction and a series of compensation correction of pump discharge without any need for the special flow measuring equipment.
Technical scheme of the present invention is: a kind of volume flow measuring method, be characterized in: be used to have one or more fixed volume pond, and there are one or more pumps therefrom to extract flow media, by calibration pump discharge curve and measuring liquid level, thereby can accurately measure the flow that flows into and flow out, its concrete steps are:
1, measures the volume in volume pond: provide the funtcional relationship S (h) of volume pond cross-sectional area and height, measure the volume in volume pond;
2, the calibration of pump lift and flow curve: treat that liquid level reaches high workload liquid level in the volume pond, close inlet valve, drive any one pump and extract liquid, up to reaching minimum work liquid level, close pump then and open inlet valve, record from valve-off to the liquid level of opening this section of valve period, pump work electric current and voltage data, draw the instantaneous delivery of pump indirectly by the variation of liquid level, draw pump lift and flow curve by fitting of a polynomial, operating one by one according to said process of a plurality of pumps arranged;
3, the calibration of pump power and flow curve: voltage and current when using the pump work of measuring in the step 2, draw the instantaneous power of pump, also go out pump power and flow curve by fitting of a polynomial, operating one by one according to said process of a plurality of pumps arranged;
4, the calculating of flow: the pump lift that (1) draws according to step 2,3---flow curve and pump power---flow curve; (2) accurate measuring liquid level value obtains instantaneous lift, according to instantaneous lift, by pump lift---and flow curve obtains the instantaneous delivery of each pump under this lift; (3) instantaneous delivery also will pass through pump power---the correction of flow curve: concrete method is to calculate its instantaneous power according to the instantaneous pump work electric current and the voltage that measure,---flow curve can obtain pump power---flow correction value by instantaneous power and power, revise through pump lift with this value again---the instantaneous delivery that flow curve obtains, total instantaneous outflow flow equals the addition of the instantaneous delivery of a plurality of pumps;
Total instantaneous outflow flow is:
Wherein n is the platform number of pump, and F (h) is lift of pump and flow matched curve, Δ F
iBe the power of i platform pump---flow correction value, p (i) is the state of i platform pump, gets 1 during work, otherwise is 0, f
Out is instantaneousBe the total instantaneous outflow flow of obtaining;
Pump power---flow correction value Δ F
iReflected the influence of the subtle change of power to real traffic in essence, this correction can improve the accuracy of instantaneous delivery, has remedied according to lift---and flow curve obtains the bigger shortcoming of instantaneous delivery error, and its functional form is:
ΔF
i＝f(ΔP
i) (2)
Δ P wherein
iFor actual instantaneous power departs from pump power---the degree of flow curve, function f are the empirical function relations that obtains according to experiment;
Total instantaneous inflow flow is:
Wherein n is the platform number of pump, and S (h) is the sectional area in volume pond and the function of height, h
1And h
2Be the measured priority level value of sampling period in interval, dt is the sampling period, f
In is instantaneousBe the instantaneous inflow flow of obtaining;
The cumulative flow outflow is:
T wherein
1And t
2Be start time and concluding time, dt is the sampling period, f
AccumulationBe the cumulative flow outflow of obtaining.
The invention has the beneficial effects as follows, use this method and measure flow, under long-term service condition, still have higher measuring accuracy, when measuring accuracy descends, can recalibrate lift of pump and flow curve easily, not need to use any extra measuring equipment, low to the conditional request at scene, operating personnel are not had extra technical requirement, and this can greatly facilitate the user.Adopt any one flow measurement, the checking of its flow measurement precision all need be verified under producer's particular device condition, flow accuracy checking of the present invention and calibration of pump process are synchronous, when finishing calibration, just can know its integrated flux measuring accuracy, any time in use can calibrate and verify.Notable feature of the present invention is exactly to make the process of traffic alignment, measurement and checking simplify, and has saved the expense of buying special flow measuring equipment greatly, and simultaneously-measured program can be integrated in the automatic monitored control system of pump easily, safeguards simple.
Description of drawings
Fig. 1 is for implementing the device connection layout of this method;
Fig. 2 is pump lift and flow matched curve figure;
Fig. 3 is pump power and flow matched curve figure.
Embodiment
The present invention relates to the volume pond of one or more connections is arranged, its volume can be measured, and can obtain height and transversal relation of plane; One or more influent stream pipelines are arranged and be equipped with valve, and have one or more submersible pumps therefrom to extract flow media, one or more outflow tubes road, one or more liquid level gauges, valve.Liquid level gauge and pump by input/output interface with can compile logic controller (PLC) or single-chip microcomputer and be connected.By outflow tube road discharge currents moving medium,, thereby can more accurate measurement flow into and the process of the flow that flows out by the process and the measuring liquid level of a cover to submersible pump flow curve calibration.
The concrete measurement mechanism of implementing is by shown in Figure 1, a volume pond is pump hole 1, pump has several pumps 2 (being exemplified as 4) in the hole, pump hole water inlet place has inlet valve 3, liquid level gauge 4 is installed in top, pump hole, valve, liquid level gauge and pump by input/output interface with can compile logic controller (PLC) or single-chip microcomputer and be connected and be used for flow measurement.
For example for a pumping plant that 4 pumps are arranged, concrete embodiment is as follows:
1. need carry out following preliminary work by the first step of the inventive method
| Sequence number | Preparatory items | Illustrate or |
| 1 | Pump hole volume data | Design drawing and in- |
| 2 | The volume correction of pump hole | Reject the factor that influences actual volume in the pump hole, |
| 3 | The parameter of dispatching from the factory of pump | The rated power of pump, electric current, lift, power characteristic, the delay parameter during the pump start-stop |
| 4 | Valve | Check the closed of inlet valve |
| 5 | The coordinate system conversion, measurement unit is unified | Make the absolute altitude in the pump hole consistent with the pump lift curvilinear coordinates; Use metric unit |
2. the calibration of pump
According to step (2,3) given process, all pumps are calibrated by platform, behind every calibration of pump, system can carry out The Fitting Calculation and provide lift of pump---flow curve and pump power---flow curve automatically according to the data of gathering, sampling rate scope circle of data acquisition is in the 10-1000 millisecond, and promptly the per second image data is 1-100 time.
Approximating method adopts fitting of a polynomial, and detailed process is as follows:
H＝a
1F
2+b
1F+c
1 (5)
P＝a
2F
2+b
2F+c
2
H is a lift in the formula, and F is an instantaneous delivery, and P is an instantaneous power, a
1, b
1, c
1, a
2, b
2, c
2Be parameter of curve to be asked.To lift---flow curve, use principle of least square method, regression coefficient a
1, b
1, c
1Can obtain by finding the solution the normal equations group:
In the formula n be the sampling count F
iAnd H
iBe the instantaneous delivery and the lift of i sampled point.
The result of match as shown in Figure 2.
Adopt that use the same method can be in the hope of pump power---flow curve, see Fig. 3.
Through above calibration process,---flow and power---flow curve that can obtain the real lift of pump.These family curves have been arranged, can be when given lift, the instantaneous delivery of calculating pump conversely.
Under the long-time running condition, pump blade wearing and tearing or mechanical property can change gradually, make pump curve be offset; Safeguard or repairing that when the pump process its mounting condition or mechanical property also can change, make pump curve be offset; When the temperature or the average density of flow media changes, also can make the skew of lift of pump and flow curve.These skews all can influence the precision of measurement.In order to improve the measuring accuracy under the long-term service condition, can be regularly maybe when above-mentioned situation occurring, should recalibrate pump curve.
3. flow rate calculation
By formula 1-4 in this method step (4) given method, can also can flow into flow and flow out flow in the hope of the instantaneous delivery and the integrated flow of every pump in the hope of total.According to a large amount of field experiment, instantaneous delivery that this method records and integrated flux precision can be controlled in 5% fully.
4. flow rate calculation precise verification process
Treat in the volume pond that liquid level reaches high workload liquid level, close inlet valve, drive any one pump and extract liquid,, close pump then and open inlet valve up to reaching minimum work liquid level.Record from valve-off to the clock of opening this section of valve period, liquid level, pump work electric current and voltage data, calculate integrated flux by this method, the relatively variation of volume pond actual liquid level, more above-mentioned two results, thus can verify the measuring accuracy of this method.
Claims (2)
1, a kind of volume flow measuring method is characterized in that, one or more fixed volume pond is arranged, and there are one or more pumps therefrom to extract flow media, by the process and the measuring liquid level of a cover pump discharge calibration, thereby can accurately measure the flow that flows into and flow out, its concrete steps are:
(1) volume in amount volume pond: provide the funtcional relationship S (h) of volume pond cross-sectional area and height, weed out the volume of shared object in the volume pond, measure the volume in volume pond;
(2) calibration of pump lift and flow curve: treat that liquid level reaches high workload liquid level in the volume pond, close inlet valve, drive any one pump and extract liquid, up to reaching minimum work liquid level, close pump then and open inlet valve, collection from valve-off to the liquid level of opening this section of valve period, pump work electric current and voltage data, draw the instantaneous delivery of pump indirectly by the variation of liquid level, draw pump lift and flow curve by fitting of a polynomial, operating one by one according to said process of a plurality of pumps arranged;
(3) calibration of pump power and flow curve: voltage and current when using the pump work of measuring in the step 2, draw the instantaneous power of pump, also go out pump power and flow curve by fitting of a polynomial, operating one by one according to said process of a plurality of pumps arranged;
(4) calculating of flow: the pump lift that (1) draws according to step 2,3---flow curve and pump power---flow curve; (2) accurate measuring liquid level value obtains instantaneous lift, according to instantaneous lift, by pump lift---and flow curve obtains the instantaneous delivery of each pump under this lift; (3) instantaneous delivery also will pass through pump power---the correction of flow curve: concrete method is to calculate its instantaneous power according to the instantaneous pump work electric current and the voltage that measure,---flow curve can obtain pump power---flow correction value by instantaneous power and power, revise through pump lift with this value again---the instantaneous delivery that flow curve obtains, total instantaneous outflow flow equals the addition of the instantaneous delivery of a plurality of pumps;
Total instantaneous outflow flow is:
Wherein n is the platform number of pump, and F (h) is lift of pump and flow matched curve, Δ F
iBe the power of i platform pump---flow correction value, p (i) is the state of i platform pump, gets 1 during work, otherwise is 0, f
Out is instantaneousBe the total instantaneous outflow flow of obtaining;
Pump power---flow correction value Δ F
iReflected the influence of the subtle change of power to real traffic in essence, this correction can improve the accuracy of instantaneous delivery, has remedied according to lift---and flow curve obtains the bigger shortcoming of instantaneous delivery error, and its functional form is:
ΔF
i＝f(ΔP
i) (2)
Δ P wherein
iFor actual instantaneous power departs from pump power---the degree of flow curve, function f are the empirical function relations that obtains according to experiment;
Total instantaneous inflow flow is:
Wherein n is the platform number of pump, and S (h) is the sectional area in volume pond and the function of height, h
1And h
2Be the measured priority level value of sampling period in interval, dt is the sampling period, f
In is instantaneousBe the instantaneous inflow flow of obtaining;
The cumulative flow outflow is:
T wherein
1And t
2Be start time and concluding time, dt is the sampling period, f
AccumulationBe the cumulative flow outflow of obtaining.
2, volume flow measuring method according to claim 1, it is characterized in that, sampling rate scope circle of described collection from valve-off to the liquid level of opening this section of valve period, pump work electric current and voltage data is in the 10-1000 millisecond, and promptly the per second image data is 1-100 time.
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|---|---|---|---|
| CNB2005100233642A CN1304825C (en) | 2005-01-14 | 2005-01-14 | Volume flow measuring method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100233642A CN1304825C (en) | 2005-01-14 | 2005-01-14 | Volume flow measuring method |
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| CN1304825C true CN1304825C (en) | 2007-03-14 |
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|---|---|---|---|---|
| CN100348863C (en) * | 2005-08-04 | 2007-11-14 | 上海交通大学 | Method for measuring pump characteristic curve by means of pipeline characteristic curve |
| CN102169001B (en) * | 2010-12-30 | 2012-08-29 | 中国计量学院 | Pumping flow detection device integrated on water pump main body |
| US9068327B2 (en) * | 2012-05-19 | 2015-06-30 | Oskar L. Granstrand | Flow meter for the measuring of fluid volumes originating from a faucet |
| WO2016110741A1 (en) * | 2015-01-05 | 2016-07-14 | Taravat Mohsen | Method and device for measuring and controlling amount of liquid pumped |
| CA3054979A1 (en) * | 2017-03-03 | 2018-09-07 | Technologies Maid Labs Inc. | Volumetric real time flow engine |
| US9977433B1 (en) | 2017-05-05 | 2018-05-22 | Hayward Industries, Inc. | Automatic pool cleaner traction correction |
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| CN108759991B (en) * | 2018-06-21 | 2021-01-05 | 广东美的暖通设备有限公司 | Measurement error diagnosis method and device for sensor in air conditioning system and air conditioning system |
| CN109752057A (en) * | 2019-02-01 | 2019-05-14 | 河海大学常州校区 | A kind of pump capacity indirect measurement method, apparatus and system |
| CN114209955B (en) * | 2021-11-16 | 2023-07-18 | 北京谊安医疗系统股份有限公司 | Proportional valve starting-up self-checking method |
| CN116956182B (en) * | 2023-09-21 | 2023-12-26 | 武汉华信数据系统有限公司 | Fault detection method in sewage pipe network |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6153519A (en) * | 1984-08-23 | 1986-03-17 | Konishiroku Photo Ind Co Ltd | Liquid metering apparatus |
| JPS64421A (en) * | 1987-06-23 | 1989-01-05 | Kurita Water Ind Ltd | Flow rate measuring instrument |
| CN1055057A (en) * | 1990-03-14 | 1991-10-02 | 北京市西城新开通用试验厂 | A kind of movable liquid tank calibrating device |
| US5497664A (en) * | 1994-11-14 | 1996-03-12 | Jorritsma; Johannes N. | Method and apparatus for calculating flow rates through a pumping station |
| CN2641597Y (en) * | 2003-08-22 | 2004-09-15 | 程进 | Noncontinuous metering device for liquid |
| CN1540298A (en) * | 2003-04-21 | 2004-10-27 | 上海威尔泰工业自动化股份有限公司 | Method for calibrating dynamic volumel |
-
2005
- 2005-01-14 CN CNB2005100233642A patent/CN1304825C/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6153519A (en) * | 1984-08-23 | 1986-03-17 | Konishiroku Photo Ind Co Ltd | Liquid metering apparatus |
| JPS64421A (en) * | 1987-06-23 | 1989-01-05 | Kurita Water Ind Ltd | Flow rate measuring instrument |
| CN1055057A (en) * | 1990-03-14 | 1991-10-02 | 北京市西城新开通用试验厂 | A kind of movable liquid tank calibrating device |
| US5497664A (en) * | 1994-11-14 | 1996-03-12 | Jorritsma; Johannes N. | Method and apparatus for calculating flow rates through a pumping station |
| CN1540298A (en) * | 2003-04-21 | 2004-10-27 | 上海威尔泰工业自动化股份有限公司 | Method for calibrating dynamic volumel |
| CN2641597Y (en) * | 2003-08-22 | 2004-09-15 | 程进 | Noncontinuous metering device for liquid |
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| CN1645063A (en) | 2005-07-27 |
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Owner name: SHANGHAIHAOCANG SYSTEM CONTROL TECHNOLOGY CO., LT Free format text: FORMER OWNER: FAN YUEFENG Effective date: 20080613 |
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Effective date of registration: 20080613 Address after: Lane 99, Lane 16, wisteria Road, Shanghai Patentee after: Shanghai HC System Control Technology Co., Ltd. Address before: Room 29, No. 258, Lane 901, waiting Road, Xuhui District, Shanghai Patentee before: Fan Yuefeng |