CN110296743A - The method for calculating flow using electromagnetic type flow meter - Google Patents
The method for calculating flow using electromagnetic type flow meter Download PDFInfo
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- CN110296743A CN110296743A CN201810249442.8A CN201810249442A CN110296743A CN 110296743 A CN110296743 A CN 110296743A CN 201810249442 A CN201810249442 A CN 201810249442A CN 110296743 A CN110296743 A CN 110296743A
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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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Abstract
The present invention includes about a kind of method for calculating flow using electromagnetic type flow meter: it is a reference signal that a computing unit, which specifies a first direction pulse signal,；An at least second direction pulse signal before the computing unit is defined on the reference signal is one first signal group；It is a second signal group that the computing unit, which is defined on at least second direction pulse signal after the reference signal,；The computing unit obtains one first difference using a First Eigenvalue of the reference signal and the first signal group；The computing unit obtains one second difference using a Second Eigenvalue of the reference signal and the second signal group；The computing unit calculates first difference and second difference to obtain a result weighted value；The computing unit obtains a flow results of a fluid using the result weighted value.
Description
Technical field
The present invention is about a kind of method for calculating flow, especially a kind of side for calculating flow using electromagnetic type flow meter
Method.
Background technique
The electromagnetic type flow meter of one the relevant technologies is installed on a pipeline to measure a flow of the fluid for flowing through the pipeline
As a result；The electromagnetic type flow meter of the relevant technologies includes at least two electrodes and two coils；Two coil charges it
Afterwards, a magnetic field is formed in the pipeline, so that the fluid is in two electrodes when the fluid passes through the magnetic field in the pipeline
Between generate multiple induced electromotive forces；It is multiple to obtain that the electromagnetic type flow meter of the relevant technologies measures those induced electromotive forces
Measuring signal；The flow results that those induced electromotive forces (also that is, those measuring signals) represent more by force the fluid are bigger；Cause
This, the electromagnetic type flow meter of the relevant technologies utilizes those induced electromotive forces (also that is, those measuring signals) to learn the stream
The flow results of body.
Many factors will affect those measuring signals；For example, two electrodes are fitted without, two coils are not pacified
It installs, two electrodes are worn because of prolonged use or the electromagnetic type flow meter of the relevant technologies is used to detection and is somebody's turn to do
Pipeline whether an empty pipe condition multiple blank pipe detectable voltage signals interference etc..Especially, for having one lower to lead
For the fluid of electric degree, those above-mentioned induced electromotive forces very little, so influence those measuring signals it is above-mentioned those because
Element can more severely impact those measuring signals of the fluid with the lower electrical conductivity.
Referring to FIG. 1, its example ideal waveform for those measuring signals of the electromagnetic type flow meter of the relevant technologies
Figure.Since the electromagnetic type flow meter of the relevant technologies includes those two electrodes, and those two electrodes are correspondingly mounted to
Different location, therefore those measuring signals include multiple first direction pulse signals 102 and multiple second direction pulses
Signal 103；For convenience of explanation, Fig. 1 only shows the first direction pulse signal 102 and a second direction pulse letter
Numbers 103.In perfect condition, a reference voltage 101 of those measuring signals is horizontal, those first direction pulse signals 102
And those second direction pulse signals 103 are ideal square wave.It is flowed when the electromagnetic type flow meter using the relevant technologies measures
When crossing the fluid of the pipeline, (the first direction pulse signal 102 is most by the flow results=correction factor * of the fluid
The minimum value of the big value-second direction pulse signal 103)；And the electromagnetic type flow meter of the relevant technologies presets the correction
Factor (calibration factor).
Referring to FIG. 2, its practical wave of the first example for those measuring signals of the electromagnetic type flow meter of the relevant technologies
Shape figure；Referring to FIG. 3, its second example actual waveform for those measuring signals of the electromagnetic type flow meter of the relevant technologies
Figure.As described above, many factors will affect those measuring signals；Therefore, as shown in Figures 2 and 3, the reference voltage 101 is by this
A little factors influence and become inclined.
Referring to FIG. 4, its practical wave of third example for those measuring signals of the electromagnetic type flow meter of the relevant technologies
Shape figure；Referring to FIG. 5, its 4th example actual waveform for those measuring signals of the electromagnetic type flow meter of the relevant technologies
Figure；Referring to FIG. 6, its 5th example actual waveform figure for those measuring signals of the electromagnetic type flow meter of the relevant technologies.
As shown in Fig. 4, Fig. 5 and Fig. 6, other than those factors as described above will affect those measuring signals, a surge signal 105
Also those measuring signals be will affect.The surge signal 105 is also known as overshoot (overshoot) phenomenon, is that typical magnetic field is handed over
The phenomenon that change can generate.
Referring to FIG. 7, its 6th practical wave of example for those measuring signals of the electromagnetic type flow meter of the relevant technologies
Shape figure.As shown in fig. 7, the reference voltage 101 is horizontal, those first direction pulse signals 102 in a normal interval 110
And those second direction pulse signals 103 are ideal square wave；In an abnormal section 113, because of the electromagnetism of the relevant technologies
Formula flowmeter issues multiple blank pipe detectable voltage signals 111 in a blank pipe detection interval 112 whether to detect the pipeline at this
Empty pipe condition, and those blank pipe detectable voltage signals 111 will affect the reference voltage 101 of those measuring signals 10, or should
Reference voltage 101 is influenced by other aforementioned those factors, so what the reference voltage 101 became inclined.
Referring to FIG. 8, its 7th practical wave of example for those measuring signals of the electromagnetic type flow meter of the relevant technologies
Shape figure.As shown in figure 8, Fig. 6 shows multiple power frequency interference signals 106 in addition to the above-mentioned surge signal 105；Power frequency
(power frequency) is interfered from an AC power source, and a supply frequency of the AC power source is between 50 hertz to 60 hertz
Between hereby.Other than those above-mentioned factors will affect the flow results of the fluid, those power frequency interference signals 106 also can shadow
Ring the flow results of the fluid.
In conclusion many factors will affect those measuring signals of the fluid, therefore the fluid cannot be accurately obtained
The flow results.
Summary of the invention
To solve the above problems, the purpose of the present invention is to provide a kind of sides for calculating flow using electromagnetic type flow meter
Method.
To reach above-mentioned purpose of the invention, the method for the invention for calculating flow using electromagnetic type flow meter is applied to one
Electromagnetic type flow meter, the electromagnetic type flow meter include a computing unit, a measuring unit and a memory unit, this uses electromagnetic type
The method that flowmeter calculates flow includes: the measuring unit measures induction electric multiple caused by the fluid in a pipeline
Gesture is to obtain multiple measuring signals；The memory unit stores those measuring signals；And the computing unit is to being stored in the memory
Those measuring signals in unit are sampled in a specific sections to execute the calculation of the flow meters of the fluid.Wherein at least 1
One direction pulse signal and at least two second direction pulse signals are in the specific sections；At least two second direction pulses letter
Number respectively before this at least a first direction pulse signal and after this at least a first direction pulse signal.Wherein should
Flow rate calculation includes: it is a reference signal that the computing unit, which specifies an at least first direction pulse signal,；The computing unit is fixed
At least second direction pulse signal of justice before the reference signal is one first signal group；The computing unit is defined on this
An at least second direction pulse signal after reference signal is a second signal group；The computing unit utilizes the reference signal
And a First Eigenvalue of the first signal group is to obtain one first difference；The computing unit is using the reference signal and is somebody's turn to do
One Second Eigenvalue of second signal group is to obtain one second difference；The computing unit calculates first difference and this is second poor
Value is to obtain a result weighted value；And the computing unit obtains a flow results of the fluid using the result weighted value.
Effect of the invention is to accurately obtain the flow results of the fluid.
In order to be further understood that the present invention to reach technology, means and effect that predetermined purpose is taken, please refers to
Following detailed descriptions and accompanying drawings of the present invention, it is believed that the purpose of the present invention, feature and feature, when can thus one deeply and
It is specific to understand, however institute's accompanying drawings are only for reference and description, the person of being not intended to limit the present invention.
Detailed description of the invention
Fig. 1 is an example ideal waveform figure of those measuring signals of the electromagnetic type flow meter of the relevant technologies.
Fig. 2 is the first example actual waveform figure of those measuring signals of the electromagnetic type flow meter of the relevant technologies.
Fig. 3 is the second example actual waveform figure of those measuring signals of the electromagnetic type flow meter of the relevant technologies.
Fig. 4 is the third example actual waveform figure of those measuring signals of the electromagnetic type flow meter of the relevant technologies.
Fig. 5 is the 4th example actual waveform figure of those measuring signals of the electromagnetic type flow meter of the relevant technologies.
Fig. 6 is the 5th example actual waveform figure of those measuring signals of the electromagnetic type flow meter of the relevant technologies.
Fig. 7 is the 6th example actual waveform figure of those measuring signals of the electromagnetic type flow meter of the relevant technologies.
Fig. 8 is the 7th example actual waveform figure of those measuring signals of the electromagnetic type flow meter of the relevant technologies.
Fig. 9 is an explanation embodiment waveform diagram of those measuring signals of electromagnetic type flow meter of the invention.
Figure 10 is the embodiment block diagram applied in electromagnetic type flow meter of the invention.
Figure 11 is an embodiment flow chart of the method for the invention that flow is calculated using electromagnetic type flow meter.
Figure 12 is an embodiment flow chart of the flow rate calculation of the invention.
Figure 13 is another embodiment block diagram applied in electromagnetic type flow meter of the invention.
Wherein, appended drawing reference:
Measuring signal 10
Electromagnetic type flow meter 30
Reference voltage 101
First direction pulse signal 102
Second direction pulse signal 103
Reference signal 104
Surge signal 105
Power frequency interference signals 106
First signal group 107
Second signal group 108
Normal interval 110
Blank pipe detectable voltage signals 111
Blank pipe detection interval 112
Abnormal section 113
Pipeline 202
Fluid 204
Specific sections 206
Computing unit 302
Measuring unit 304
Memory unit 306
Waveform oscilloscope 308
Screen 310
Keyboard 312
Rate-adaptive pacemaker port 314
Digital output port 316
Communicate output port 318
Ferro-electric random access memory body 320
Digital analog converter 322
Electric current high-speed channel can addressing remote transducer output port 324
First microprocessor 326
Second microprocessor 328
Balanced voltage analyzer 330
Energy converter 332
First low-pass filter 334
Second low-pass filter 336
First amplifier 338
Second amplifier 340
First analog-digital converter 342
Second analog-digital converter 344
Third analog-digital converter 346
Empty pipe detection circuitry 348
Direction switch 350
Current controller 352
First electrode 354
Second electrode 356
Coil circuit 358
Reference ground 360
Power supply unit 362
Induced electromotive force 363
Filtering signal 364
Amplified signal 366
Blank pipe detects feedback signal 368
Step S02~06
Step T02~14
Specific embodiment
In this exposure, many specific details are provided, use offer to the thorough of specific embodiments of the present invention
Understand；However, those skilled in the art should know, in the case where those specific details of none or more, according to
The present invention can so be practiced；In other cases, then it is of the invention to avoid having obscured that well-known details is not shown or described
Technical characteristics.Hereby the technical content and a detailed description for the present invention, cooperation schema are described as follows:
Referring to FIG. 9, its explanation embodiment waveform diagram for those measuring signals of electromagnetic type flow meter of the invention；
It please also refer to Figure 10, be the embodiment block diagram applied in electromagnetic type flow meter of the invention；It please also refer to Figure 11,
It is an embodiment flow chart of the method for the invention that flow is calculated using electromagnetic type flow meter.Use electromagnetic type of the invention
Flowmeter calculate flow method be applied to an electromagnetic type flow meter 30, the electromagnetic type flow meter 30 include a computing unit 302,
One measuring unit 304 and a memory unit 306, those above-mentioned units are electrically connected to each other.This is calculated using electromagnetic type flow meter
The method of flow comprises the steps of
Step S02: the measuring unit 304 measures induction electric multiple caused by the fluid 204 in a pipeline 202
Gesture is to obtain multiple measuring signals 10.
Step S04: the memory unit 306 stores those measuring signals 10.
Step S06: the computing unit 302 is specific one to those measuring signals 10 being stored in the memory unit 306
Section 206 is sampled to execute the calculation of the flow meters of the fluid 204.
Those measuring signals 10 of the invention include multiple first direction pulse signals 102 and multiple second directions
Pulse signal 103；For convenience of explanation, Fig. 9 only shows the first direction pulse signal 102 and two those second directions
Pulse signal 103；One reference voltage 101 of those measuring signals 10 is theoretically horizontal, but the benchmark that Fig. 9 is shown is electric
Pressure 101 be it is inclined, to tally with the actual situation, but the computing unit 302 using a conformal coordinates convert (conformal
Mapping those measuring signals 10) are rotated into a predetermined angle, and being converted in the computing unit 302 using the conformal coordinates will
After those measuring signals 10 rotate the predetermined angle, which executes the flow rate calculation again；Wherein, the preset angle
Degree can make those postrotational measuring signals 10 and the reference voltage 101 become horizontal.
Fig. 8 please be referred to again, those aforementioned power frequency interference signals 106 will affect the flow rate calculation of the fluid 204, therefore this
The computing unit 302 of invention is with an AC power source (being not illustrated in those diagrams, and to be supplied to the electromagnetic type flow meter 30)
One of supply frequency r multiple those measuring signals 10 are sampled, wherein the computing unit 302 defines the r multiple and is
Greater than zero a positive integer multiple (also that is, the computing unit 302 with the supply frequency of the AC power source greater than zero this just
Integer multiple samples those measuring signals 10), and the supply frequency of the AC power source is between 50 hertz to 60 hertz
Between；Furthermore the r multiple is also referred to as a resonance frequency multiple.The computing unit 302 specifies the specific sections 206 to include should
One u multiple of one power cycle of AC power source, it is the positive integer greater than zero that wherein the computing unit 302, which defines the u multiple,
Multiple is (also that is, it includes the power cycle of the AC power source greater than zero that the computing unit 302, which specifies the specific sections 206,
The positive integer multiple)；Furthermore the u multiple is also referred to as an expanded period multiple.By the computing unit 302 with the alternating current
The r multiple of the supply frequency in source samples those measuring signals 10 and the computing unit 302 specifies the given zone
Between 206 comprising the AC power source the power cycles the u multiple, can will significantly reduce the multiple of those measuring signals 10
The interference of noise (that is, those power frequency interference signals 106 shown in Fig. 8).
As shown in figure 9, an at least first direction pulse signal 102 and at least two second direction pulse signals 103 are at this
In specific sections 206；At least two second direction pulse signals 103 respectively an at least first direction pulse signal 102 it
It is preceding and after this at least a first direction pulse signal 102.
Figure 12 is please referred to, is an embodiment flow chart of the flow rate calculation of the invention；It please also refer to Fig. 9 and figure
10.The above-mentioned flow rate calculation comprises the steps of
Step T02: it is a reference signal 104 that the computing unit 302, which specifies an at least first direction pulse signal 102,.
Step T04: the computing unit 302 is defined on at least second direction pulse letter before the reference signal 104
Numbers 103 be one first signal group 107.
Step T06: the computing unit 302 is defined on at least second direction pulse letter after the reference signal 104
Numbers 103 be a second signal group 108.
Step T08: the computing unit 302 utilizes the reference signal 104 and a fisrt feature of the first signal group 107
Value is to obtain one first difference.Also that is, the computing unit 302 is using the reference signal 104 and in the first signal group 107
The First Eigenvalue of (a little) second direction pulse signal 103 is somebody's turn to do to obtain first difference.
Step T10: the computing unit 302 utilizes the reference signal 104 and a second feature of the second signal group 108
Value is to obtain one second difference.Also that is, the computing unit 302 is using the reference signal 104 and in the second signal group 108
The Second Eigenvalue of (a little) second direction pulse signal 103 is somebody's turn to do to obtain second difference.
Step T12: the computing unit 302 calculates first difference and second difference to obtain a result weighted value.
For the example of Fig. 9, those above-mentioned steps can be indicated with this formula: the result weighted value=[(reference signal
An at least second direction pulse signal 103 for the 104- second signal group 108)+(reference signal 104- the first signal group
A 107 at least second direction pulse signal 103)]/2.Whereby, can be obtained not is inclined shadow by the reference voltage 101
The loud result weighted value；Also it that is, characteristic can be ignored in the slope variation using the reference voltage 101 in the unit time, at least adopts
With 3 those measuring signals 10 (also that is, an at least second direction pulse of the reference signal 104, the second signal group 108
An at least second direction pulse signal 103 for signal 103, the first signal group 107) use eliminate the reference voltage 101 be
It is inclined to influence (also that is, the present invention has the zero point level correction of the dynamic reference voltage 101).
Step T14: the computing unit 302 obtains a flow results of the fluid 204 using the result weighted value.The meter
Unit 302 is calculated using the result weighted value and a product of a correction factor (calibration factor) to obtain the fluid
204 flow results, and the correction factor is between 0.1 to 2.0, and the electromagnetic type flow meter 30 preset the correction because
Number.
Fig. 9 shows a first direction pulse signal 102 and two second direction pulse signals 103 in the specific sections
In 206, but invention is not limited thereto, multiple first direction pulse signals 102 and multiple second direction pulses
Signal 103 can be in the specific sections 206, therefore in above-mentioned steps T02, which specifies those first direction arteries and veins
Rushing one of signal 102 is the reference signal 104, and in above-mentioned steps T04, which is defined on the benchmark
Those second direction pulse signals 103 before signal 104 are the first signal group 107, and in above-mentioned steps T06, the calculating
It is the second signal group 108 that unit 302, which is defined on those second direction pulse signals 103 after the reference signal 104,.
In a specific embodiment of the invention, those of the first signal group 107 are defined as by the computing unit 302
One first quantity of second direction pulse signal 103 be equal to by the computing unit 302 be defined as the second signal group 108 those
One second quantity of second direction pulse signal 103；For example, first quantity is equal to 100, and second quantity is equal to 100.
And detected about blank pipe, it includes an at least blank pipe detection interval which, which defines the specific sections 206,
112 make the measuring unit 304 issue multiple blank pipe detectable voltage signals 111 whether to detect the pipeline 202 in a blank pipe shape
State, after the measuring unit 304 issues those blank pipe detectable voltage signals 111, those blank pipe detectable voltage signals 111 can shadow
Ring the reference voltage 101 (also that is, what the reference voltage 101 became inclined) of those measuring signals 10；Wherein, the computing unit
302 define 1/10th that the blank pipe detection interval 112 is less than the specific sections 206.
Therefore, in step T08, which avoids those blank pipes issued by the measuring unit 304 detection electricity
The blank pipe detection interval 112 of signal 111 is pressed to accurately obtain the First Eigenvalue of the first signal group 107；In step
T10, the computing unit 302 avoid the blank pipe inspection of those blank pipe detectable voltage signals 111 issued by the measuring unit 304
Section 112 is surveyed to accurately obtain the Second Eigenvalue of the second signal group 108.Also that is, the computing unit 302 is avoided by this
The blank pipe detection interval 112 for those blank pipe detectable voltage signals 111 that measuring unit 304 is issued is to execute the flowmeter
It calculates, uses the influence for eliminating those blank pipe detectable voltage signals 111 to the reference voltage 101 of those measuring signals 10.
In another specific embodiment of the invention: in step T02, which defines the reference signal 104
For this voltage signal, and define a maximum value or this electricity that this voltage signal peak value is this voltage signal
Press a minimum value of signal；In step T04, it is y voltage signal before one which, which defines the first signal group 107,
And defining y is the positive integer greater than zero；After step T10, which is further included: the computing unit 302 defines a P
Value is a preset voltage value (for example, one default particular phases voltage value or a specific level voltage reference value)；The computing unit
302 calculate: this flow signal={ (the one of the P value of this voltage signal peak value-preceding y voltage signal is averaged
Value)+(this voltage signal peak value-this voltage signal the P value) }/2.
One specific embodiment of above content are as follows: in step T02, which defines this voltage signal peak
Value is the maximum value of this voltage signal, which defines the P value as the minimum value, therefore the computing unit
302 calculate: this flow signal={ (minimum value of the maximum value-of this voltage signal preceding y voltage signal
The average value)+(minimum value of the maximum value-of this voltage signal this voltage signal)/2.In step T12
Later, which calculates: flow results of the fluid=mono- correction factor of this flow signal *.
Figure 13 is please referred to, is another embodiment block diagram applied in electromagnetic type flow meter of the invention.One electromagnetic type
Flowmeter 30 includes the computing unit 302 above-mentioned, the measuring unit 304 above-mentioned, the memory unit 306 above-mentioned, a wave
Shape display 308, a screen 310, a keyboard 312, a rate-adaptive pacemaker port 314, a digital output port 316, one communication are defeated
Exit port 318, a ferro-electric random access memory body 320, a digital analog converter 322 and an electric current high-speed channel can addressing it is remote
Journey converter output end mouth 324；The computing unit 302 includes a first microprocessor 326, one second microprocessor 328 and one
Balanced voltage analyzer 330；The measuring unit 304 includes an energy converter 332, one first low-pass filter 334, one second low pass
Filter 336, one first amplifier 338, one second amplifier 340, the simulation of one first analog-digital converter 342, one second
Digital quantizer 344, a third analog-digital converter 346, an empty pipe detection circuitry 348, a direction switch 350 and an electric current
Controller 352；The energy converter 332 includes a first electrode 354, a second electrode 356, a coil circuit 358 and a reference ground
End 360.Those above-mentioned elements are electrically connected to each other, and give those above-mentioned elements by a power supply unit 362 power supply.
The electromagnetic type flow meter 30 is installed on the pipeline 202 to measure the flow for the fluid 204 for flowing through the pipeline 202
As a result.The coil circuit 358 includes two coils (being not illustrated in Figure 13)；The first microprocessor 326 and the current controller 352
Direction switch 350 is controlled to two coil charges；After two coil charges, a magnetic field is formed in the pipeline
In 202 so that when the fluid 204 passes through the magnetic field in the pipeline 202, the fluid 204 the first electrode 354 and this
Multiple induced electromotive forces 363 is generated between two electrodes 356.
The first electrode 354 and the second electrode 356 transmit those induced electromotive forces 363 to first low-pass filter
334 and second low-pass filter 336；First low-pass filter 334 and 336 low-pass filtering of the second low-pass filter those
Induced electromotive force 363 is to obtain multiple filtering signals 364；First low-pass filter 334 and second low-pass filter 336
Those filtering signals 364 are transmitted to first amplifier 338, second amplifier 340, second analog-digital converter 344
And the third analog-digital converter 346.
First amplifier 338 and the second amplifier 340 amplify those filtering signals 364 to obtain multiple amplified signals
366；First amplifier 338 and the second amplifier 340 transmit those amplified signals 366 to first analog-digital converter
342；First analog-digital converter 342, which converts those amplified signals 366, becomes those measuring signals 10 above-mentioned；This first
Analog-digital converter 342 transmits those measuring signals 10 to the first microprocessor 326.
Second analog-digital converter 344 and the third analog-digital converter 346 convert those filtering signals 364 at
For those measuring signals 10 above-mentioned；Second analog-digital converter 344 and the third analog-digital converter 346 transmission should
A little measuring signals 10 are to the first microprocessor 326.The empty pipe detection circuitry 348 transmit a blank pipe detect feedback signal 368 to
The first microprocessor 326.Wherein, the electromagnetic type flow meter 30 by the first electrode 354 and the second electrode 356 (and
It is not illustrated in the circuit of Figure 13) it sends those blank pipe detectable voltage signals 111 (being not illustrated in Figure 13) above-mentioned the blank pipe is detected
Circuit 348 is able to detect and transmit blank pipe detection feedback signal 368 to the first microprocessor 326 to judge the pipeline
Whether 202 in the empty pipe condition (being the impedance judged between the first electrode 354 and the second electrode 356).
The first microprocessor 326 cooperates with the balanced voltage analyzer 330 to utilize those measuring signals 10 and the blank pipe
It detects feedback signal 368 and carries out a voltage measurement and a resistance measurement, and second microprocessor 328 then utilizes those measurement letters
Numbers 10, blank pipe detection feedback signal 368, the voltage measurement and resistance measurement carries out a mass flow (mass flow) and counts
Calculation, a volume flow (volume flow) calculate, a flow velocity (velocity) calculates, a total amount (total volume) calculates,
One pipeline state (tube status) judgement, frequency monitoring, pipeline state monitoring, a temperature monitoring (need additional temperature
Inductor is spent, Figure 13 is not illustrated in).Remaining content of Figure 13 is similar with other above-mentioned diagrams or content, therefore repeats no more in this.
In conclusion the present invention can remove the interference of those aforementioned factors or noise etc., by the steady of periodic signal
Devise a stratagem is calculated, the interference signal or distorted signals that removal moment electromagnetic coupling generates；Those skies of the present invention with more periodic signal
Pipe detectable voltage signals 111 to learn whether the fluid 204 in the pipeline 202 has mobility or generation cavitation pitting at any time
(cavity), more accurately to obtain the flow results of the fluid 204.
Furthermore the present invention also discloses a kind of reference feedback method of signal, by the measuring signal 10 instantly and previously
Or those other measuring signals 10 make comprehensive calculation, so that when the interference of those aforementioned factors or noise etc. occurs,
The present invention can be with self adjustment feedback, to maintain accurately measurement.
It is inclined by the aforementioned reference voltage 101 furthermore the present invention also discloses a kind of formula of the falling biography computing rule of signal
Influence, by iterative calculation more than twice with the reference signal deviation voltage of revise signal so that when those aforementioned factors or
When the interference of noise etc. occurs, the present invention can be with self adjustment feedback, to maintain accurately measurement.
In short, the flow results of aforementioned related art=correction factor * (the first direction pulse signal 102
The minimum value of the maximum value-second direction pulse signal 103), but many factors will affect the single time first direction pulse
The minimum value of the maximum value of signal 102 and the single second direction pulse signal 103, therefore the stream cannot be accurately obtained
Measure result.
And the present invention then improves this problem, calculation formula of the invention contains:
The result weighted value=[(an at least second direction pulse for the reference signal 104- second signal group 108 is believed
Number 103)+(at least second direction pulse signal 103 for reference signal 104- the first signal group 107)]/2.
This flow signal={ (this of the P value of this voltage signal peak value-preceding y voltage signal is average
Value)+(this voltage signal peak value-this voltage signal the P value) }/2.
This flow signal={ (minimum value of the maximum value-of this voltage signal preceding y voltage signal
The average value)+(minimum value of the maximum value-of this voltage signal this voltage signal)/2.
Furthermore the present invention, which also discloses many, to be helped to accurately obtain the content of the flow results, such as:
1. the computing unit 302 is converted using the conformal coordinates rotates the predetermined angle for those measuring signals 10, connect
The computing unit 302 execute the flow rate calculation again, use improve the reference voltage 101 be inclination the problem of.
2. the computing unit 302 carries out those measuring signals 10 with the r multiple of the supply frequency of the AC power source
It includes the u multiple of the power cycle of the AC power source that sampling and the computing unit 302, which specify the specific sections 206, will
The interference of those power frequency interference signals 106 can significantly be reduced.
3. the computing unit 302 avoids being somebody's turn to do for those blank pipe detectable voltage signals 111 issued by the measuring unit 304
Blank pipe detection interval 112 is used to execute the flow rate calculation and eliminates those blank pipe detectable voltage signals 111 to those measuring signals
The influence of 10 reference voltage 101.
So as described above, only presently preferred embodiments of the present invention, when cannot limit the scope of implementation of the present invention, i.e., it is all according to
Equivalent changes and modifications made by scope of the present invention patent etc. should still belong to patent covering scope of the invention and be intended to protection
Scope.The present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, be familiar with ability
The technical staff in domain makes various corresponding changes and modifications in accordance with the present invention, but these corresponding changes and modifications are all answered
It falls within the protection scope of the appended claims of the present invention.Know that the present invention has had industry applications, novelty in conclusion working as
With progressive, and construction of the invention had not also seen similar product and had openly used, and complied fully with application for a patent for invention important document,
It files an application according to Patent Law whence.
Claims (10)
1. a kind of method for calculating flow using electromagnetic type flow meter, which is characterized in that be applied to an electromagnetic type flow meter, the electricity
Magnetic-type flowmeter includes a computing unit, a measuring unit and a memory unit, this calculates flow using electromagnetic type flow meter
Method includes:
A. the measuring unit measures induced electromotive force multiple caused by the fluid in a pipeline to obtain multiple measurements
Signal；
B. the memory unit stores those measuring signals；And
C. the computing unit samples to execute those measuring signals being stored in the memory unit in a specific sections
The flow meters of the fluid are calculated,
A wherein at least first direction pulse signal and at least two second direction pulse signals are in the specific sections；This is at least
Two second direction pulse signals are respectively before this at least a first direction pulse signal and in an at least first direction arteries and veins
It rushes after signal,
Wherein the flow rate calculation includes:
D. it is a reference signal that the computing unit, which specifies an at least first direction pulse signal,；
E. at least second direction pulse signal before the computing unit is defined on the reference signal is one first signal group；
F. it is a second signal group that the computing unit, which is defined on at least second direction pulse signal after the reference signal,；
G. the computing unit obtains one first difference using a First Eigenvalue of the reference signal and the first signal group；
H. the computing unit obtains one second difference using a Second Eigenvalue of the reference signal and the second signal group；
I. the computing unit calculates first difference and second difference to obtain a result weighted value；And
J. the computing unit obtains a flow results of the fluid using the result weighted value.
2. the method for calculating flow using electromagnetic type flow meter as described in claim 1, which is characterized in that multiple this first
Direction pulse signal and multiple second direction pulse signals are in the specific sections；In step d, which refers to
One of those fixed first direction pulse signals are the reference signal；In step e, which is defined on the benchmark
Those second direction pulse signals before signal are the first signal group；In step f, which is defined on the benchmark
Those second direction pulse signals after signal are the second signal group.
3. the method for calculating flow using electromagnetic type flow meter as claimed in claim 2, which is characterized in that by the computing unit
One first quantity for being defined as those second direction pulse signals of the first signal group, which is equal to, is defined as this by the computing unit
One second quantity of those second direction pulse signals of second signal group.
4. the method for calculating flow using electromagnetic type flow meter as described in claim 1, which is characterized in that, should in step j
Computing unit is using a product of the result weighted value and a correction factor to obtain the flow results of the fluid；In the step
J, the correction factor is between 0.1 to 2.0.
5. the method for calculating flow using electromagnetic type flow meter as described in claim 1, which is characterized in that, should in step c
Computing unit samples those measuring signals with a r multiple of a supply frequency of an AC power source；The computing unit is fixed
The adopted r multiple is the positive integer multiple greater than zero；The supply frequency of the AC power source is between 50 hertz to 60 hertz；
In step c, it includes a u multiple of a power cycle of the AC power source which, which specifies the specific sections,；The calculating
It is the positive integer multiple greater than zero that unit, which defines the u multiple,.
6. the method for calculating flow using electromagnetic type flow meter as described in claim 1, which is characterized in that, should in step g
Computing unit avoids a blank pipe detection interval of the multiple blank pipe detectable voltage signals issued by the measuring unit with correct
Ground obtains the First Eigenvalue of the first signal group；In step h, what which avoided being issued by the measuring unit
The blank pipe detection interval of those blank pipe detectable voltage signals is to accurately obtain the Second Eigenvalue of the second signal group；?
After the measuring unit issues those blank pipe detectable voltage signals, those blank pipe detectable voltage signals influence those measuring signals
One reference voltage, then then the computing unit avoids the skies of those blank pipe detectable voltage signals issued by the measuring unit
Pipe detection interval is to execute the flow rate calculation.
7. the method for calculating flow using electromagnetic type flow meter as described in claim 1, which is characterized in that the computing unit is fixed
The adopted specific sections include that a blank pipe detection interval makes the measuring unit issue multiple blank pipe detectable voltage signals to detect this
Whether pipeline is in an empty pipe condition；The computing unit defines 1/10th that the blank pipe detection interval is less than the specific sections.
8. the method for calculating flow using electromagnetic type flow meter as described in claim 1, which is characterized in that, should in step c
Computing unit is converted using a conformal coordinates rotates a predetermined angle for those measuring signals；In step c, in the computing unit
After those measuring signals are rotated the predetermined angle using conformal coordinates transformation, which executes the flow rate calculation.
9. the method for calculating flow using electromagnetic type flow meter as described in claim 1, which is characterized in that, should in step d
It is this voltage signal that computing unit, which defines the reference signal, and defines this voltage signal peak value as this voltage letter
Number a maximum value or this voltage signal a minimum value；In step e, which defines the first signal group and is
Y voltage signal before one, and defining y is the positive integer greater than zero；After step i, which is further included:
I1. it is a preset voltage value that the computing unit, which defines a P value,；And
I2. the computing unit calculates: this flow signal={ (this voltage signal peak value-preceding y voltage signal
One average value of the P value)+(this voltage signal peak value-this voltage signal the P value) }/2.
10. the method for calculating flow using electromagnetic type flow meter as claimed in claim 9, which is characterized in that the predeterminated voltage
Value is a default particular phases voltage value or a specific level voltage reference value；Wherein in step d, computing unit definition should
This voltage signal peak value is the maximum value of this voltage signal；In step i1, it is to be somebody's turn to do which, which defines the P value,
Minimum value；In step i2, which is calculated: this flow signal={ (maximum value-of this voltage signal
The average value of the minimum value of the preceding y voltage signal)+(maximum value-of this voltage signal this voltage signal
The minimum value)/2；After step j, which is further included:
J1. the computing unit calculates: flow results of the fluid=mono- correction factor of this flow signal *.
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