CN202994223U - Micro-flow electromagnetic flow meter - Google Patents
Micro-flow electromagnetic flow meter Download PDFInfo
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- CN202994223U CN202994223U CN 201220740114 CN201220740114U CN202994223U CN 202994223 U CN202994223 U CN 202994223U CN 201220740114 CN201220740114 CN 201220740114 CN 201220740114 U CN201220740114 U CN 201220740114U CN 202994223 U CN202994223 U CN 202994223U
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Abstract
The utility model discloses a micro-flow electromagnetic flow meter. According to the conventional electromagnetic flow meter, a peak sampling and holding signal processing circuit is commonly adopted for amplification of a flow signal, various interference noises are amplified along with the flow signal by using a broadband signal amplifier, and a noise spectrum is shifted or aliased into a frequency band of the flow signal, so signal to noise ratio is low, resolution is low, and the measurement lower limit of flow is difficult to expand. The micro-flow electromagnetic flow meter comprises a shell (1), wherein a master controller (2) is arranged inside the shell and respectively connected with an oscillating circuit (3), a signal processing circuit (4), an excitation control circuit (5), a light emitting diode (LED) digital display circuit (7) and a key control circuit (8); the excitation control circuit is connected with an excitation power amplification circuit (9); the excitation power amplification circuit is connected with an excitation coil (6); and the signal processing circuit is connected with a sensor (10). The micro-flow electromagnetic flow meter is used for measuring the micro-flow of a conductive medium.
Description
Technical field:
The utility model relates to a kind of micrometeor electromagnetic flowmeter.
Background technology:
Along with improving constantly of industrial automation level, in industrial processes, need to carry out Measurement accuracy and control to flow, the flow velocity of various pipes inner fluid, simultaneously, a job such as, reduction of discharging energy-conservation for further carrying out, consumption reduction, environmental protection, the importance of flow measurement, particularly micro-flow measurement also seems and becomes increasingly conspicuous.
In the electromagnetic flowmeter that uses at present, the peak sampling and holding signal treatment circuit is generally adopted in amplification to flow signal, its broadband signal amplifier, multiple interference noise together is exaggerated with flow signal, inevitable the noise spectrum shift frequency or be aliased in the frequency band of flow signal, cause that signal to noise ratio (S/N ratio) is low, measurement lower limit that differentiate rate variance, flow is difficult to expansion.Existing peak sampling and holding signal treatment circuit has restricted the raising of micrometeor electromagnetic flowmeter performance index.
Summary of the invention:
The purpose of this utility model be to provide a kind of simple in structure, reliability is high, good stability, the desirable micrometeor electromagnetic flowmeter of measuring accuracy.
Above-mentioned purpose realizes by following technical scheme:
A kind of micrometeor electromagnetic flowmeter, its composition comprises: housing, described enclosure interior is equipped with master controller, described master controller is connected with oscillatory circuit, signal processing circuit, excitation control circuit, the digital display circuit of LED, key control circuit respectively, described excitation control circuit is connected with the excitation power amplifier, described excitation power amplifier is connected with field coil, and described signal processing circuit is connected with sensor.
Described micrometeor electromagnetic flowmeter has display screen, operating key on described housing, described display screen comprises the digital display circuit of described LED, and described operating key is connected with key control circuit.
Described micrometeor electromagnetic flowmeter, described master controller comprises single-chip microcomputer, timer, A/D converter, the model of described single-chip microcomputer is AT89C55.
Described micrometeor electromagnetic flowmeter, described signal processing circuit comprises broad band amplifier, and described broad band amplifier is connected with traffic filter, and described traffic filter is connected with detuner, and described detuner is connected with the restituted signal generator.
Described micrometeor electromagnetic flowmeter, described detuner are phase-sensitive demodulator, and described restituted signal generator is the phase demodulation signal generator.
Beneficial effect:
High, the good stability of micrometeor electromagnetic flowmeter reliability of the present utility model, corrosion resistance is strong, measuring accuracy is high, its traffic filter carries out narrow-band filtering to the output of broad band amplifier, the filtering higher hamonic wave, obtain the first-harmonic of flow velocity signal, and the power that makes multiple interference noise reductions going along with is little and reduce, improve signal to noise ratio (S/N ratio), thereby improve the performance index of micrometeor electromagnetic flowmeter, the flow measurement lower limit is effectively expanded.
2. restituted signal generator of the present utility model, consisted of by the AT89C2051 single-chip microcomputer that U.S. ATMEL company produces, pulse signal p (t) 1 of exportable control phase-sensitive demodulator work and p (t) 2, circuit is simple, sequential is accurate, reliable operation.
3. broad band amplifier of the present utility model adopts the Precision Integrated instrument amplifier AD624AD that U.S. AD company produces, and the induction electromotive force (flow velocity signal) of exporting between the electromagnetic flow transducer detecting electrode is amplified.
Description of drawings:
Accompanying drawing 1 is structural representation of the present utility model.
Accompanying drawing 2 is theory diagrams of signal processing circuit in accompanying drawing 1.
Accompanying drawing 3 is circuit theory diagrams of traffic filter in accompanying drawing 2.
Accompanying drawing 4 is circuit theory diagrams of phase-sensitive demodulator in accompanying drawing 2.
Embodiment:
Embodiment 1:
A kind of micrometeor electromagnetic flowmeter, its composition comprises: housing 1, described enclosure interior is equipped with master controller 2, described master controller is connected with oscillatory circuit 3, signal processing circuit 4, excitation control circuit 5, the digital display circuit 7 of LED, key control circuit 8 respectively, described excitation control circuit is connected with excitation power amplifier 9, described excitation power amplifier is connected with field coil 6, and described signal processing circuit is connected with sensor 10.
Embodiment 2:
Above-mentioned micrometeor electromagnetic flowmeter has display screen, operating key on described housing, described display screen comprises the digital display circuit of described LED, and described operating key is connected with key control circuit.
Embodiment 3:
Above-mentioned micrometeor electromagnetic flowmeter, described master controller comprise single-chip microcomputer 11, timer 12, A/D converter 13, and the model of described single-chip microcomputer is AT89C55.
Embodiment 4:
Above-mentioned micrometeor electromagnetic flowmeter, described signal processing circuit comprises broad band amplifier 14, described broad band amplifier is connected with traffic filter 15, and described traffic filter is connected with detuner 16, and described detuner is connected with restituted signal generator 17.
Embodiment 5:
Above-mentioned micrometeor electromagnetic flowmeter, described detuner are phase-sensitive demodulator, and described restituted signal generator is the phase demodulation signal generator.
Claims (5)
1. micrometeor electromagnetic flowmeter, its composition comprises: housing, it is characterized in that: described enclosure interior is equipped with master controller, described master controller is connected with oscillatory circuit, signal processing circuit, excitation control circuit, the digital display circuit of LED, key control circuit respectively, described excitation control circuit is connected with the excitation power amplifier, described excitation power amplifier is connected with field coil, and described signal processing circuit is connected with sensor.
2. micrometeor electromagnetic flowmeter according to claim 1 is characterized in that: have display screen, operating key on described housing, described display screen comprises the digital display circuit of described LED, and described operating key is connected with key control circuit.
3. micrometeor electromagnetic flowmeter according to claim 1 and 2, it is characterized in that: described master controller comprises single-chip microcomputer, timer, A/D converter, the model of described single-chip microcomputer is AT89C55.
4. micrometeor electromagnetic flowmeter according to claim 1 and 2, it is characterized in that: described signal processing circuit comprises broad band amplifier, described broad band amplifier is connected with traffic filter, described traffic filter is connected with detuner, and described detuner is connected with the restituted signal generator.
5. micrometeor electromagnetic flowmeter according to claim 1 and 2, it is characterized in that: described detuner is phase-sensitive demodulator, described restituted signal generator is the phase demodulation signal generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220740114 CN202994223U (en) | 2012-12-30 | 2012-12-30 | Micro-flow electromagnetic flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220740114 CN202994223U (en) | 2012-12-30 | 2012-12-30 | Micro-flow electromagnetic flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202994223U true CN202994223U (en) | 2013-06-12 |
Family
ID=48565395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220740114 Expired - Fee Related CN202994223U (en) | 2012-12-30 | 2012-12-30 | Micro-flow electromagnetic flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202994223U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266697A (en) * | 2014-10-22 | 2015-01-07 | 中山欧麦克仪器设备有限公司 | High-accuracy electromagnetic flow meter |
| CN104280080A (en) * | 2014-10-22 | 2015-01-14 | 中山欧麦克仪器设备有限公司 | Grounded electromagnetic flow meter |
| CN104280081A (en) * | 2014-10-22 | 2015-01-14 | 中山欧麦克仪器设备有限公司 | Intelligent large-diameter electromagnetic flowmeter |
| CN104596598A (en) * | 2015-01-29 | 2015-05-06 | 哈尔滨理工大学 | Digital-analog hybrid filtering low-flow-velocity electromagnetic flowmeter |
-
2012
- 2012-12-30 CN CN 201220740114 patent/CN202994223U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266697A (en) * | 2014-10-22 | 2015-01-07 | 中山欧麦克仪器设备有限公司 | High-accuracy electromagnetic flow meter |
| CN104280080A (en) * | 2014-10-22 | 2015-01-14 | 中山欧麦克仪器设备有限公司 | Grounded electromagnetic flow meter |
| CN104280081A (en) * | 2014-10-22 | 2015-01-14 | 中山欧麦克仪器设备有限公司 | Intelligent large-diameter electromagnetic flowmeter |
| CN104596598A (en) * | 2015-01-29 | 2015-05-06 | 哈尔滨理工大学 | Digital-analog hybrid filtering low-flow-velocity electromagnetic flowmeter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20141230 |
|
| EXPY | Termination of patent right or utility model |