CN104236645B - Intelligent magnetic inductive flow sensor - Google Patents
Intelligent magnetic inductive flow sensor Download PDFInfo
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- CN104236645B CN104236645B CN201410520060.6A CN201410520060A CN104236645B CN 104236645 B CN104236645 B CN 104236645B CN 201410520060 A CN201410520060 A CN 201410520060A CN 104236645 B CN104236645 B CN 104236645B
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Abstract
A kind of intelligent electromagnetic inductive flow sensor proposed by the present invention, it is desirable to provide a kind of low in energy consumption, the flow sensor that compatibility is strong, versatility is good, output signal is data signal.The technical scheme is that：Liquid flow excessively stream quantity sensor, rotated by guider impeller, induce the voltage being directly proportional to mean flow rate, electromagnetic induction voltage signal is transferred to conversion process circuit, it is transformed to the square-wave signal that frequency and uninterrupted are directly proportional, modulation amplifying circuit amplifies faint magnetic induction signal modulation, be converted to the square-wave signal that dutycycle is 50%, the HFS in signal is filtered out through RC low-pass filter circuits, signal after square-wave signal shaping is sent into signal processing module by detecting circuit, signal processing module is calculated collection signal, result of calculation is sent to communication module and data memory module, handle and calculate by Signal Data Processor, flow information is sent to by communication module by terminal device.
Description
Technical field
The present invention relates to it is a kind of be mainly used in aircraft, automobile, ship engine fuel consumption measurement, instantaneous delivery measurement
Flow sensor, applies also for pipeline liquid flow measurement.
Background technology
Flow measurement plays very important effect, flow sensor in industry, agricultural and daily life
Therefore also it is widely used as measurement flow instrument.Turbine type flow sensor is the volume flow the liquid flowed through in pipeline
Amount is converted to linear electric signal.Its transfer principle is exactly famous Faraday's electromagnetic induction law, i.e., fluid driven impeller is cut
Electromagnetic wire, produces electromotive force.The magnetic field of flow sensor is realized by excitation, divides DC excitation, AC excitation and low frequency
Square-wave excitation.Flow sensor uses low-frequency square-wave excitation mostly now.Transmitter is by field circuit, signal filtering amplification electricity
Road, A/D sample circuits, microcontroller circuit, D/A circuits, transmission circuit etc. are constituted.Electromagnetic flowmeter is passed by flow
What sensor and transmitter were constituted.
With the development of electronic technology, the electronic degree of aircraft, automobile, steamer is improved constantly, and common mechanical system is
The problem of through being difficult to solve some relevant with duty of engine requirement, and it is electronically controlled system replacement.Intelligent electric magnetic flow
Meter is the renewal product of the electromagnetic flowmeter of old analog, intelligent electric magnetic flowmeter not only can 4~20mA of band outputs,
Can also band RS485 or RS232 communication interfaces, directly and computer networking can be easy to remote monitoring and operation.Intelligence electricity
The operation principle of magnetic flowmeter is to be based on Faraday's electromagnetic induction law.The measuring principle of intelligent electromagnetic flowmeter is to be based on farad
When law of electromagnetic induction impeller makees cutting magnetic line movement in magnetic field, induced potential is produced in conductor, its induced potential E=
In KBVD formulas:K is that instrument constant B is magnetic induction intensity, and V is the mean flow rate in measurement pipeline section, and D is-measurement pipeline section
During the inner diameter measurement flow in face, fluid is rotated with speed V driving impellers, and the impeller circumgyration incision magnetic line of force induces one and average
The voltage that flow velocity is directly proportional, its induced voltage signal is detected by two electrodes, and is delivered to converter by cable and passed through intelligence
Change is handled, and then LCD shows or be converted into standard signal 4~20mA and 0~1kHz output.Flow sensor of the prior art
Species reach over one hundred kind, different occasions and measurement medium select different flow sensors.The letter exported by flow sensor
It number can be divided into voltage signal, current signal and frequency signal etc., carry out signal acquisition and calculating by other detection devices, deposit
Being related to, equipment is more, complex interfaces, signal transmission distance farther out, the shortcomings of being easily disturbed.The intelligent electromagnetic of prior art
Flow sensor poor compatibility, do not have versatility, and volume is big, power consumption is high, and reliability is low.
The content of the invention
It is an object of the invention to be related to for the presence of prior art consumption measurement system, equipment is more, and complex interfaces are believed
Farther out, the shortcomings of being easily disturbed is there is provided a kind of small volume, low in energy consumption, and compatibility is strong, reliability is high, general for number transmission range
Property good, output signal be data signal flow sensor.
The above-mentioned purpose of the present invention can reach that a kind of intelligent electromagnetic inductive flow sensor is wrapped by following measures
Impeller, guider that electromagnetic induction signal is transmitted in assembling in the housing are included, by modulation amplifying circuit, filter circuit and detection shaping
The signaling conversion circuit that circuit is constituted and the number containing power module, signal processing module, data memory module and communication module
Word circuit, it is characterised in that：Signaling conversion circuit and digital circuit are integrated in flow sensor, liquid flow inflow-rate of water turbine sensing
Device, is rotated by guider impeller, induces the voltage being directly proportional to mean flow rate, and electromagnetic induction voltage signal is passed
Conversion process circuit is defeated by, the square-wave signal that frequency and uninterrupted are directly proportional is transformed to, modulation amplifying circuit is faint magnetic strength
Induction signal modulation amplification, is converted to the square-wave signal that dutycycle is 50%, the high frequency in signal is filtered out through RC low-pass filter circuits
Part, detecting circuit by after square-wave signal shaping signal send into signal processing module, by Signal Data Processor handle and
Calculate, calculating, which is obtained flow information, is sent to data memory module progress data storage, and by communication module flow information
It is sent to terminal device.
The present invention has the advantages that compared to existing flow sensor：
Strong antijamming capability.The present invention completes signal acquisition and calculating inside flow sensor, is output as data signal,
Do not influenceed by cable length and distributed constant.EMC Design is taken, circuit reliability is high, can be in complicated electromagnetism ring
Worked under border.
Measuring system is simplified, signal conversion part and digital circuit part are integrated into sensor internal, can be direct
Measurement obtains flowing through the flow information of sensor, measurement result and velocity flow profile, Fluid pressure, the physics such as temperature, density, viscosity
Parameter is unrelated.Digital amount processing, is output as the body by impeller in data signal, the pipeline of perfect accurate reversible metering closing
Product flow, with very strong antijamming capability, reduces measuring apparatus, shortens measuring route, improve reliability.In sensing
The measurement to flow information is had been completed inside device, rear end equipment is only needed to by communications reception flow information.Measurement is reliable,
Precision is high, using 16 embedded microprocessors, and there are three integrators can show that rollforward amount reversely adds up respectively for inside
Amount and difference integrating amount, arithmetic speed are fast, and precision is high, and programmable frequency low-frequency rectangular ripple excitation improves the steady of flow measurement
It is qualitative.Outside control instruction is subjected to, calculating parameter and metering system is adjusted flexibly.
Brief description of the drawings
Fig. 1 is the circuit theory schematic diagram of intelligent electromagnetic inductive flow sensor.
Fig. 2 is Fig. 1 signaling conversion circuit principle schematics.
Fig. 3 is Fig. 1 signal processing module circuit theory schematic diagrams.
Fig. 4 is Fig. 1 communication modules and data memory module circuit theory schematic diagram.
Fig. 5 is Fig. 1 power module circuitry principle schematics.
Fig. 6 is a kind of configuration schematic diagram of intelligent electromagnetic inductive flow sensor of the present invention.
Embodiment
The present invention will be further illustrated in the examples below, these embodiments be merely to illustrate the present invention and to this
Invention is not limited.
In Fig. 1, intelligent electromagnetic inductive flow sensor, including mechanical part, signal conversion part divide and numerical portion.Machine
Tool part includes impeller, the guider that assembling produces electromagnetic induction signal in the housing.Signal conversion part point and numerical portion bag
Include the signaling conversion circuit that is made up of modulation amplifying circuit, filter circuit and detection shaping circuit signal and containing power module,
The digital circuit of signal processing module, data memory module and communication module.Signaling conversion circuit and digital circuit make standard
Module is integrated in flow sensor, liquid flow excessively stream quantity sensor, is rotated by guider impeller, induce one with
The voltage that mean flow rate is directly proportional, electromagnetic induction voltage signal is transferred to conversion process circuit, is transformed to frequency and uninterrupted
The square-wave signal being directly proportional, modulation amplifying circuit amplifies faint magnetic induction signal modulation, is converted to the side that dutycycle is 50%
Ripple signal, the HFS in signal is filtered out through RC low-pass filter circuits, and detecting circuit send the signal after square-wave signal shaping
Enter signal processing module, signal processing module is calculated collection signal, and result of calculation is sent to communication module and data
Flow information, terminal device is sent to by communication module by memory module.
In fig. 2, signaling conversion circuit include being connected to signal condition chip between power supply VCC and earth terminal GND and
Resistance R201, R202 and optocoupler U201 on the circuit of signal condition chip output pin 7 are connected on, and is connected in parallel on signal condition core
Electric capacity C205 compositions between piece ground path and series resistance R201, resistance R202 contacts.Resistance R201 and electric capacity C205 groups
Into RC low-pass filter circuits.Resistance R202, optocoupler U201 and grounding resistance R203 composition detection shaping circuits.Signal condition core
Piece is special integrated modulated amplifier D201 customized.Integrated modulated amplifier D201 is the faint magnetic produced due to wheel rotation
Induced signal modulation amplification, is converted to the square-wave signal that dutycycle is 50%, and square-wave signal passes through resistance R201 and electric capacity C205
The RC low-pass filter circuits of composition filter out the high-frequency signal in signal, and RC parameter is according to the frequency separation of sensor sample signal
It is adjusted, detection shaping circuit is used to filter out the clutter without driving force, and carries out shaping to signal.
In figure 3, signal processing module uses AVR single chip D101 as Signal Data Processor, single-chip microcomputer D101's
Crystal oscillator G101 is electrically connected, and crystal oscillating circuit, monolithic are constituted by electric capacity C101, electric capacity C102 in parallel between crystal oscillator G101 ground connection
The series resistance R101 of machine D101 output pins 4 and the electric capacity C103 of parallel connection, electric capacity C104, diode N4148 constitute electricity on RC
The decoupling circuit of reset circuit, the electric capacity C105~C107 being connected in parallel between power supply and ground and ground capacity C109 compositions, it is single
Piece machine D101, crystal oscillating circuit, RC electrification reset circuits and decoupling circuit composition signal processing module.Resistance R102~R105 and
JP101 constitutes jtag interface, and external equipment carries out field programming and analog simulation to AVR single chip by jtag interface, can compiled
Collect the pattern and the calculation of flow information of the collection of signal.Signal processing module receives the control that PERCOM peripheral communication mode is transmitted through coming
System order, gathers signal, is calculated, result of calculation is sent to communication module and data memory module.
In Fig. 4, serial ports ferroelectric memory D103, power management chip D104 and communication driving chip D102 pass through bus
Structure carries out data transfer with signal processing module.Communication module is used as pin-saving chip with serial ports ferroelectric memory D103
Storage calculates obtained historical data, intermediate variable and calculates the meter parameter needed, can be data in need when
Being output to external equipment, there is provided data retrieval.Power management chip D104 power supply not quietly when, protect D103 data
It is not written over, and when single-chip microcomputer is in " deadlock " state, to single-chip microcomputer again RESET.Communication driving chip D102 can be
The RS422A communication driving chips of full duplex, communication driving chip D102 is used for the control command for receiving outside, and transmitted traffic
Information is to terminal device.
In Figure 5, power module includes filter circuit, accumulator and DC-DC conversion circuit.Filter circuit includes passing through
Capacitor C301, voltage-regulator diode V302 and the fast diode V301 of power-supply filter N301 and input are connected in parallel on, is stored up
Can capacitor C401, capacitor C402, in parallel fast diode V401 and resistance R401 of the circuit including being connected in parallel on output end
And capacitor C403 and series resistance R402, the designs of these circuits can effectively filter out power supply clutter, improve electromagnetic compatibility
Ability, wherein high-capacity tantalum capacitor C402 protect back-end circuit when surge and instantaneous power-down occurs in power supply.DC-DC is converted
The parallel connection that circuit includes being connected in parallel on power module N201 input end capacitor devices C202, inductor L201 and capacitor C201 compositions is returned
Road, output and ground capacitor C203, C204 in parallel act as other modules and provide galvanic current source.Power supply
The design of module can ensure that product can be powered experiment by direct current supply characteristic B classes in GJB181A-2003.
In figure 6, sequence 1 is pcb board installing frame, for installing the standard that signal conversion part point and digital circuits section are made
Module, sequence 2 is the serial cylindrical connectors of GJB599 III, and sequence 3 is the supporting shielding tail annex of the serial cylindrical connectors of GJB599 III,
Sequence 4 is to be designed to the hickey of M30 × 1.5 by HB4-3, and inlet and outlet is 74 ° of outer wimble interfaces, interface connected mode and biography
Sensor bore can be designed according to actual needs, with meet different pipe diameter and different mounting means the need for, sequence 5
For pcb board installing frame, for installing the standard module that filter circuit and accumulator are made.
Claims (10)
1. a kind of intelligent electromagnetic inductive flow sensor, including assembling are transmitted the impeller of electromagnetic induction signal, are oriented in the housing
Device, the signaling conversion circuit being made up of modulation amplifying circuit, filter circuit and detection shaping circuit and containing power module, signal
The digital circuit of processing module, data memory module and communication module, it is characterised in that：Signaling conversion circuit and digital circuit collection
Into in flow sensor, integrated use of digital circuit can show the reverse cumulative amount of rollforward amount and difference integrating amount respectively,
And with 16 embedded microprocessors of three integrators；Liquid flow excessively stream quantity sensor is turned by guider impeller
It is dynamic, the voltage being directly proportional to mean flow rate is induced, electromagnetic induction voltage signal is transferred to conversion process circuit, is transformed to
The square-wave signal that frequency and uninterrupted are directly proportional, modulation amplifying circuit amplifies faint magnetic induction signal modulation, is converted to and accounts for
Sky filters out the HFS in signal through RC low-pass filter circuits, detecting circuit is whole by square-wave signal than the square-wave signal for 50%
Signal feeding signal processing module after shape, handles and calculates by Signal Data Processor, calculating is obtained flow information hair
Data storage is carried out toward data memory module, and flow information is sent to by communication module by terminal device.
2. intelligent electromagnetic inductive flow sensor as claimed in claim 1, it is characterised in that：Signaling conversion circuit includes connection
Signal condition chip between power supply VCC and earth terminal GND and the resistance being connected on the circuit of signal condition chip output pin 7
R201, R202 and optocoupler U201, and it is connected in parallel on signal condition chip ground circuit and series resistance R201, resistance R202 contacts
Between electric capacity C205.
3. intelligent electromagnetic inductive flow sensor as claimed in claim 2, it is characterised in that：Resistance R201 and electric capacity C205 groups
Into RC low-pass filter circuits.
4. intelligent electromagnetic inductive flow sensor as claimed in claim 2, it is characterised in that：Resistance R202 and optocoupler U201 with
And grounding resistance R203 composition detection shaping circuits.
5. intelligent electromagnetic inductive flow sensor as claimed in claim 2, it is characterised in that：Integrated modulated amplifier D201 handles
Due to the faint magnetic induction signal modulation amplification that wheel rotation is produced, the square-wave signal that dutycycle is 50%, square-wave signal are converted to
The high-frequency signal in signal is filtered out by the resistance R201 and electric capacity C205 RC low-pass filter circuits constituted, RC parameter is according to biography
The frequency separation of sensor sampled signal is adjusted, and detection shaping circuit filters out the clutter without driving force, and signal is entered
Row shaping.
6. intelligent electromagnetic inductive flow sensor as claimed in claim 1, it is characterised in that：Signal processing module uses AVR
Single-chip microcomputer D101 is as Signal Data Processor, single-chip microcomputer D101 electrical connection crystal oscillator G101, and is grounded by crystal oscillator G101
Between in parallel electric capacity C101, electric capacity C102 composition crystal oscillating circuit, the series resistance R101 of single-chip microcomputer D101 output pins 4 and parallel connection
Electric capacity C103, electric capacity C104, diode N4148 composition RC electrification reset circuits, be connected in parallel on the electric capacity between power supply and ground
C105~C107 and ground capacity C109 composition decoupling circuit, single-chip microcomputer D101, crystal oscillating circuit, RC electrification reset circuits with
And decoupling circuit composition signal processing module.
7. intelligent electromagnetic inductive flow sensor as claimed in claim 1, it is characterised in that：Serial ports ferroelectric memory D103,
Power management chip D104 and communication driving chip D102 carries out data transfer by bus structures and signal processing module,.
8. intelligent electromagnetic inductive flow sensor as claimed in claim 7, it is characterised in that：Data memory module is with serial ports iron
Electrical storage D103 is used as pin-saving chip storage and calculates obtained historical data, intermediate variable and calculate the instrument needed
Parameter, can outputting data to external equipment in need when, there is provided data retrieval.
9. intelligent electromagnetic inductive flow sensor as claimed in claim 1, it is characterised in that：Power module includes filtered electrical
Road, accumulator and DC-DC conversion circuit;Filter circuit includes the electricity by being connected in parallel on power-supply filter N301 and input
Container C301, voltage-regulator diode V302 and fast diode V301.
10. intelligent electromagnetic inductive flow sensor as claimed in claim 1, it is characterised in that：Accumulator includes being connected in parallel on
The capacitor C401 of output end, capacitor C402, fast diode V401 in parallel and resistance R401, capacitor C403 series electricals
Hinder R402.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410520060.6A CN104236645B (en) | 2014-09-30 | 2014-09-30 | Intelligent magnetic inductive flow sensor |
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| CN201410520060.6A CN104236645B (en) | 2014-09-30 | 2014-09-30 | Intelligent magnetic inductive flow sensor |
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| CN104236645B true CN104236645B (en) | 2017-09-29 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107402051A (en) * | 2016-05-18 | 2017-11-28 | 云南师范大学 | A kind of flow registering instrument with wireless supervisory control function |
| CN106556714A (en) * | 2016-11-16 | 2017-04-05 | 北京中船信息科技有限公司 | A kind of real-time watch device of long term monitoring river bottom hydrologic parameter |
| WO2021087704A1 (en) * | 2019-11-04 | 2021-05-14 | 深圳市大疆创新科技有限公司 | Electromagnetic flowmeter, control method, spraying system, and agricultural unmanned aerial vehicle |
| CN111256767A (en) * | 2020-03-17 | 2020-06-09 | 深圳市佳运通电子有限公司 | Precise water injection flow meter for oil field water injection well |
| CN114944837B (en) * | 2022-05-31 | 2023-09-01 | 深圳市博亿精科科技有限公司 | proximity sensor circuit |
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| CN2618151Y (en) * | 2003-04-10 | 2004-05-26 | 五邑大学 | Intelligent supersonic level sensor |
| CN203231776U (en) * | 2013-03-11 | 2013-10-09 | 常州信息职业技术学院 | Electromagnetic flowmeter |
| CN103575337A (en) * | 2013-11-22 | 2014-02-12 | 哈尔滨理大晟源科技开发有限公司 | Turbine flow meter and method for measuring fluid |
| CN103575341A (en) * | 2012-07-25 | 2014-02-12 | 伊玛精密电子（苏州）有限公司 | Intelligent electromagnetic flow sensor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007037166A1 (en) * | 2007-08-07 | 2009-02-19 | Endress + Hauser Flowtec Ag | gauge |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2618151Y (en) * | 2003-04-10 | 2004-05-26 | 五邑大学 | Intelligent supersonic level sensor |
| CN103575341A (en) * | 2012-07-25 | 2014-02-12 | 伊玛精密电子（苏州）有限公司 | Intelligent electromagnetic flow sensor |
| CN203231776U (en) * | 2013-03-11 | 2013-10-09 | 常州信息职业技术学院 | Electromagnetic flowmeter |
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