CN110470353A - A kind of electromagnetic flow-measurement device based on related algorithm - Google Patents
A kind of electromagnetic flow-measurement device based on related algorithm Download PDFInfo
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- CN110470353A CN110470353A CN201910694079.5A CN201910694079A CN110470353A CN 110470353 A CN110470353 A CN 110470353A CN 201910694079 A CN201910694079 A CN 201910694079A CN 110470353 A CN110470353 A CN 110470353A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
- G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
- G01F1/588—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters combined constructions of electrodes, coils or magnetic circuits, accessories therefor
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a kind of electromagnetic flow-measurement device based on related algorithm, on the basis of existing electromagnetic flow-measurement device, increase a pair of of metal induction electrode, it is mounted on the place that first pair of metal induction electrode downstream distance is L, induced charge can be mobile with working fluid (fluid) in measurement pipe, and the speed of movement is related to the speed that fluid flows.At the time of charge occurs at L, the signal on the second metal induction electrode will be made to change.Since the induced signal is generated with the charge once induced, although situations such as charge fusion can occur in communication process, two signals correlation still with higher can carry out relevant treatment, it calculates and flows through this apart from consumed time t, finally obtain flow rate of liquid, flow.The present invention carries out the extraction of flow rate information using the correlation principle of signal, insensitive to the absolute value of signal, and avoiding influences signal absolute value measurement bring due to electromagnetic flowmeter working environment complexity.
Description
Technical field
The invention belongs to flow measurement technology fields, more specifically, are related to a kind of electromagnetic current based on related algorithm
Measuring device.
Background technique
Flow measurement technology daily production and life in be widely used, such as waterworks water process,
Crude oil transmission of Petroleum Production enterprise etc..
Electromagnetic flowmeter (Electromagnetic Flowmeters, abbreviation EMF) be 50~sixties of 20th century with
The development of electronic technology and the novel flow rate measuring device developed rapidly.Electromagnetic flowmeter is to apply electromagnetic induction principle,
A kind of instrument of conductive fluid flow is measured by the electromotive force inducted when externally-applied magnetic field according to conductive fluid.
Existing electromagnetic flowmeter detects the induced electromotive force generated when fluid flows through magnetic field using a pair of of induction electrode, and
Flow rate information is obtained according to the corresponding relationship of the induced electromotive force size and fluid flow rate.
However, the fluid flow rate that existing electromagnetic flowmeter measures is more sensitive to the absolute value of the induced electromotive force of generation,
Electromagnetic flowmeter working environment is complicated, influences on the absolute value of induced electromotive force measurement meeting bring, in this way, will affect fluid stream
The precision of speed measurement, and then influence the measurement of fluid flow.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of electromagnetic flow-measurements based on related algorithm
Device improves the measurement accuracy of fluid flow to reduce the influence of working environment bring induced electromotive force absolute value.
For achieving the above object, the present invention is based on the electromagnetic flow-measurement devices of related algorithm, comprising:
One measurement pipe, is made by insulating materials, and both ends are connected using flange with pipeline；
One magnet exciting coil is mounted at the position perpendicular to measurement pipe axis, for generating perpendicular to liquid flow direction
Magnetic field B；
One exciting circuit, for starting exciting circuit output winding pumping signal to excitation coil according to enabling signal；
First pair of metal induction electrode, is mounted in measurement pipe, the lines of two metal induction electrodes perpendicular to magnetic field B and
It measures on conduit axis, for picking up induced signal (first electrode induced signal)；
First signal detection and amplifying circuit, for detecting induced signal and the amplification of the pickup of first pair of metal induction electrode
The first data acquisition circuit is sent into certain amplitude；
First data acquisition circuit, for provided in exciting circuit synchronization signal control under, to the first signal detection
And amplifying circuit picks up amplified induced signal and is acquired, and obtains first electrode acquisition signal, and be sent into data processing and
Control unit；
It is characterized by further comprising:
Second pair of metal induction electrode is mounted in measurement pipe and is located at first pair of metal induction electrode downstream distance for L's
Place, the line of two metal induction electrodes is parallel with the line of two metal induction electrodes of first pair of metal induction electrode,
For picking up induced signal (second electrode induced signal)
Second signal detection and amplifying circuit, for detecting induced signal and the amplification of the pickup of second pair of metal induction electrode
The second data acquisition circuit is sent into certain amplitude；
Second data acquisition circuit, under the control of synchronization signal that exciting circuit provides, to second signal detection and
Amplifying circuit picks up amplified induced signal and is acquired, and obtains second electrode acquisition signal, and be sent into data processing and control
Unit processed；
Data processing and control unit start exciting circuit output winding pumping signal to excitation for generating enabling signal
Coil makes magnet exciting coil generate the magnetic field B perpendicular to liquid flow direction, meanwhile, enabling signal synchronizes exciting circuit output
Signal gives the first data acquisition circuit, the second data acquisition circuit；Digital processing and control unit acquire signal to first electrode
It is delayed, and carries out relevant calculation with second electrode acquisition signal, when correlation maximum, delay time is that fluid flows through
The time difference t of two pairs of metal induction electrodes, calculates flow velocity v=L/t, and then according to flow velocity v, convert outflow.
The object of the present invention is achieved like this:
The present invention is based on the electromagnetic flow-measurement devices of related algorithm, on the basis of existing electromagnetic flow-measurement device,
A pair of of metal induction electrode is increased, is mounted on the place that first pair of metal induction electrode downstream distance is L, while this is to metal
The line of two metal induction electrodes of the line and first pair of metal induction electrode of two metal induction electrodes of induction electrode
In parallel, such working fluid (fluid) can be as conductor, when doing the movement of cutting magnetic line in the B of magnetic field, at its both ends
Induced electromotive force is generated, it is corresponding to generate induced charge i.e. induced signal in pipe wall position.Induced charge meeting in measurement pipe
As working fluid (fluid) is mobile, the speed of movement is related to the speed that fluid flows.At the time of charge occurs at L,
The signal on the second metal induction electrode will be made to change.Since the induced signal is generated with the charge once induced
, although charge fusion can occur in communication process, two signals correlation still with higher.By right
The signal that two different positions detect carries out relevant treatment, calculates and flows through this apart from consumed time t, finally obtains
Flow rate of liquid obtains flow value in conjunction with measurement pipe diameter.The present invention carries out mentioning for flow rate information using the correlation principle of signal
It takes.It is insensitive to the absolute value of signal compared to more traditional method, it avoids since electromagnetic flowmeter working environment complexity is to letter
Number absolute value measurement bring influences.
Detailed description of the invention
Fig. 1 is that the present invention is based on a kind of specific embodiment Sensor sections of the electromagnetic flow-measurement device of related algorithm
Structural schematic diagram；
Fig. 2 is a kind of principle signal of specific embodiment of electromagnetic flow-measurement device the present invention is based on related algorithm
Figure；
Fig. 3 is delay time relevant calculation schematic diagram.
Specific embodiment
A specific embodiment of the invention is described with reference to the accompanying drawing, preferably so as to those skilled in the art
Understand the present invention.It needs especially to point outIt is, in the following description, when known function and the detailed description of design perhaps
When can desalinate main contents of the invention, these descriptions will be ignored herein.
It in the present embodiment, as shown in Figure 1, 2, include measurement the present invention is based on the electromagnetic flow-measurement device of related algorithm
Pipe 1, magnet exciting coil 2,3, first pairs of metal induction electrodes 4 of exciting circuit, the first signal detection and amplifying circuit 5, the first data
6, second pairs of metal induction electrodes 7 of Acquisition Circuit, second signal detection and amplifying circuit 8, the second data acquisition circuit 9, data
Processing and control unit 10.
As shown in Figure 1, measurement pipe 1 is made by insulating materials, both ends are connected using flange with pipeline (not shown).It encourages
Magnetic coil 2 is mounted at the position perpendicular to 1 axis of measurement pipe, for generating the magnetic field B perpendicular to liquid flow direction.
First pair of metal induction electrode 4 includes electrode C1-, C1+, is mounted in measurement pipe 1, two metal induction electrodes
Line is perpendicular on 1 axis of magnetic field B and measurement pipe, for picking up induced signal (first electrode induced signal) Signal1.
Second pair of metal induction electrode 7 includes electrode C2-, C2+, is mounted in measurement pipe 1 and is located at first pair of metal induction
The place that 4 downstream of electrode distance is L, the line of two metal induction electrodes and two metals of first pair of metal induction electrode 4
The line of induction electrode is parallel, for picking up induced signal (second electrode induced signal) Signal2.
In the present embodiment, as shown in Fig. 2, exciting circuit 3 starts the excitation of 3 output winding of exciting circuit according to enabling signal
Signal is to excitation coil 2.
First signal detection and amplifying circuit 5 detect the induced signal Signal1 of first pair of metal induction electrode 4 pickup simultaneously
Certain amplitude is amplified to be sent into the first data acquisition circuit 6.
Second signal detection and amplifying circuit 8 detect the induced signal Signal2 of second pair of metal induction electrode 7 pickup simultaneously
Certain amplitude is amplified to be sent into the second data acquisition circuit 9.
First data acquisition circuit 6 is under the synchronization signal control that exciting circuit 3 provides, to the first signal detection and amplification
Circuit 5 picks up amplified induced signal and is acquired, and obtains first electrode acquisition signal, and is sent into data processing and control list
Member 10.
Second data acquisition circuit 9 detects second signal and amplifies under the synchronization signal control that exciting circuit 3 provides
Circuit 8 picks up amplified induced signal and is acquired, and obtains second electrode acquisition signal, and is sent into data processing and control list
Member 10.
Data processing and control unit 10 generate enabling signal and start 3 output winding pumping signal of exciting circuit to excitation line
Circle 2 makes magnet exciting coil 2 generate the magnetic field B perpendicular to liquid flow direction.Meanwhile enabling signal synchronizes the output of exciting circuit 3
Signal gives the first data acquisition circuit 6, the second data acquisition circuit 9.Digital processing and control unit 10 acquire first electrode
Signal is delayed, and carries out relevant calculation with second electrode acquisition signal, and when correlation maximum, delay time is fluid
The time difference t for flowing through two pairs of metal induction electrodes 4,7, calculates flow velocity v=L/t, and then according to flow velocity v, convert outflow.
The present invention realize based on the principle that
1, it when the liquid flowed as conductor, can do the movement of cutting magnetic line in magnetic field, is generated at its both ends
Induced electromotive force, it is corresponding to generate induced charge i.e. induced signal Signal1 in pipe wall position.
2, induced charge in the duct can be mobile with the liquid of flowing, the speed phase of rate and the fluid flowing of movement
It closes；
3, at the time of charge occurs, the induced signal Signal2 on second pair of metal induction electrode 7 of detection will be made to become
Change.As shown in figure 3, since induced signal Signal2 is generated with the charge once induced, although in communication process
Situations such as charge fusion can occur, but two signals correlation still with higher.By being detected to two different positions
The induced signal arrived carries out relevant treatment, calculates and flows through this apart from consumed time t, flow rate of liquid is obtained, in conjunction with measurement
Pipe diameter obtains flow.
The process that the present invention works can be described as follows:
Before starting one-shot measurement, data processing and control unit 10 issue enabling signal to exciting circuit 3.Exciting circuit t0
The coil excitation signals that generation duration at moment and intensity are fixed give magnet exciting coil 2, to generate the magnetic field B of constant intensity,
It is applied in measurement pipe 1.At the same time, exciting circuit 3 issues together to the first data acquisition circuit 6, the second data acquisition circuit 9
Signal is walked, starts them and starts to acquire.
Induced signal on first pair of metal induction electrode 4 and second pair of metal induction electrode 7 passes through the first signal respectively
After detection and amplifying circuit 5, second signal detection and amplifying circuit 8 amplify, then it is respectively fed to the first data acquisition circuit 6, the
Two data acquisition circuits 9 start to acquire first pair of metal induction electrode 4 and second pair of metal induction under control of the synchronization signal
Induced signal on electrode 7, and be stored in local memory.
After coil excitation signals, the first data acquisition circuit 6 stops working, and the second data acquisition circuit 9 continues
Work, and continue to give acquisition data to data processing and control unit 10.The time to work on by measurement flow velocity range
It obtains.
Digital processing and control unit 10 are delayed to first electrode acquisition signal, and with second electrode acquire signal into
Row relevant calculation, when correlation maximum, delay time is the time difference t that fluid flows through two pairs of metal induction electrodes 4,7, meter
Flow velocity v=L/t is calculated, then according to flow velocity v, convert outflow.
The present invention carries out the extraction of flow rate information using the correlation principle of signal.Compared to more traditional method, to signal
Absolute value it is insensitive, avoid due to electromagnetic flowmeter working environment complexity on signal absolute value measurement bring influence.
Certainly, the present invention can also complete the acquisition of induced voltage absolute value, obtain flow according to induced voltage absolute value,
The function of flow measurement is carried out using induced voltage absolute value so as to condenser type flowmeter before realizing, and completely dispenses with and repairs
Change circuit structure.Therefore the present invention has stronger adaptability and flexibility, passes through obtain both methods using algorithm
Value is combined, and each other as other side's beneficial complement, is expected to obtain better measurement result.
Although the illustrative specific embodiment of the present invention is described above, in order to the technology of the art
Personnel understand the present invention, it should be apparent that the present invention is not limited to the range of specific embodiment, to the common skill of the art
For art personnel, if various change the attached claims limit and determine the spirit and scope of the present invention in, these
Variation is it will be apparent that all utilize the innovation and creation of present inventive concept in the column of protection.
Claims (1)
1. a kind of electromagnetic flow-measurement device based on related algorithm, comprising:
One measurement pipe, is made by insulating materials, and both ends are connected using flange with pipeline；
One magnet exciting coil is mounted at the position perpendicular to measurement pipe axis, for generating the magnetic perpendicular to liquid flow direction
Field B；
One exciting circuit, for starting exciting circuit output winding pumping signal to excitation coil according to enabling signal；
First pair of metal induction electrode, is mounted in measurement pipe, and the line of two metal induction electrodes is perpendicular to magnetic field B and measurement
On conduit axis, for picking up induced signal (first electrode induced signal)；
First signal detection and amplifying circuit, for detecting the induced signal of first pair of metal induction electrode pickup and being amplified to one
Fixed amplitude is sent into the first data acquisition circuit；
First data acquisition circuit, under the control of synchronization signal that exciting circuit provides, to the first signal detection and amplification
Circuit picks up amplified induced signal and is acquired, and obtains first electrode acquisition signal, and is sent into data processing and control list
Member；
It is characterized by further comprising:
Second pair of metal induction electrode is mounted on the place for being located at that first pair of metal induction electrode downstream distance is L in measurement pipe,
The line of two metal induction electrodes is parallel with the line of two metal induction electrodes of first pair of metal induction electrode, for picking up
Take induced signal (second electrode induced signal)
Second signal detection and amplifying circuit, for detecting the induced signal of second pair of metal induction electrode pickup and being amplified to one
Fixed amplitude is sent into the second data acquisition circuit；
Second data acquisition circuit, under the synchronization signal control provided in exciting circuit, second signal being detected and being put
Big circuit picks up amplified induced signal and is acquired, and obtains second electrode acquisition signal, and be sent into data processing and control
Unit；
Data processing and control unit start exciting circuit output winding pumping signal to excitation line for generating enabling signal
Circle makes magnet exciting coil generate the magnetic field B perpendicular to liquid flow direction, meanwhile, enabling signal makes the synchronous letter of exciting circuit output
Number give the first data acquisition circuit, the second data acquisition circuit；Digital processing and control unit to first electrode acquire signal into
Line delay, and relevant calculation is carried out with second electrode acquisition signal, when correlation maximum, delay time is that fluid flows through two
To the time difference t of metal induction electrode, flow velocity v=L/t is calculated, then according to flow velocity v, convert outflow.
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| CN201910694079.5A CN110470353B (en) | 2019-07-30 | 2019-07-30 | Electromagnetic flow measuring device based on correlation algorithm |
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| CN201910694079.5A CN110470353B (en) | 2019-07-30 | 2019-07-30 | Electromagnetic flow measuring device based on correlation algorithm |
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| CN110470353B CN110470353B (en) | 2021-01-26 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780818A (en) * | 2020-07-22 | 2020-10-16 | 西安交通大学 | Induction type liquid metal electromagnetic flowmeter |
| CN113252122A (en) * | 2021-05-18 | 2021-08-13 | 山东科尔自动化仪表股份有限公司 | Charge flowmeter and flow metering method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006006154A1 (en) * | 2005-12-23 | 2007-07-05 | Abb Patent Gmbh | Field compensation method for use with magnetically inductive flow meters, involves alternate adjustment of maximum or minimum signal voltage during arrangement of several spools |
| CN201107058Y (en) * | 2007-11-20 | 2008-08-27 | *** | Intelligent electromagnetic flowmeter for measuring multiple parameters |
| CN101387530A (en) * | 2007-07-26 | 2009-03-18 | Abb有限公司 | Flowmeter |
| CN201945337U (en) * | 2010-11-05 | 2011-08-24 | 中国原子能科学研究院 | Liquid metal flowmeter based on correlational method |
| CN103439528A (en) * | 2013-09-16 | 2013-12-11 | 中国矿业大学(北京) | Method and device for measuring flow speed of dense paste based on electromagnetic signal cross correlation |
| US20140260659A1 (en) * | 2010-02-08 | 2014-09-18 | General Electric Company | Multiphase flow measurement using electromagnetic sensors |
| CN104061970A (en) * | 2014-07-08 | 2014-09-24 | 电子科技大学 | Electromagnetic flow signal detection method |
| CN104061969A (en) * | 2014-07-08 | 2014-09-24 | 电子科技大学 | Capacitive electromagnetic flow signal converter |
-
2019
- 2019-07-30 CN CN201910694079.5A patent/CN110470353B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006006154A1 (en) * | 2005-12-23 | 2007-07-05 | Abb Patent Gmbh | Field compensation method for use with magnetically inductive flow meters, involves alternate adjustment of maximum or minimum signal voltage during arrangement of several spools |
| CN101387530A (en) * | 2007-07-26 | 2009-03-18 | Abb有限公司 | Flowmeter |
| CN201107058Y (en) * | 2007-11-20 | 2008-08-27 | *** | Intelligent electromagnetic flowmeter for measuring multiple parameters |
| US20140260659A1 (en) * | 2010-02-08 | 2014-09-18 | General Electric Company | Multiphase flow measurement using electromagnetic sensors |
| CN201945337U (en) * | 2010-11-05 | 2011-08-24 | 中国原子能科学研究院 | Liquid metal flowmeter based on correlational method |
| CN103439528A (en) * | 2013-09-16 | 2013-12-11 | 中国矿业大学(北京) | Method and device for measuring flow speed of dense paste based on electromagnetic signal cross correlation |
| CN104061970A (en) * | 2014-07-08 | 2014-09-24 | 电子科技大学 | Electromagnetic flow signal detection method |
| CN104061969A (en) * | 2014-07-08 | 2014-09-24 | 电子科技大学 | Capacitive electromagnetic flow signal converter |
Non-Patent Citations (1)
| Title |
|---|
| 何金田: "《传感器原理与应用课程设计指南》", 30 January 2009 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780818A (en) * | 2020-07-22 | 2020-10-16 | 西安交通大学 | Induction type liquid metal electromagnetic flowmeter |
| CN111780818B (en) * | 2020-07-22 | 2021-05-28 | 西安交通大学 | Induction type liquid metal electromagnetic flowmeter |
| CN113252122A (en) * | 2021-05-18 | 2021-08-13 | 山东科尔自动化仪表股份有限公司 | Charge flowmeter and flow metering method |
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