CN203203729U - Intelligent low-power-consumption electromagnetic heat energy meter - Google Patents
Intelligent low-power-consumption electromagnetic heat energy meter Download PDFInfo
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- CN203203729U CN203203729U CN 201320228803 CN201320228803U CN203203729U CN 203203729 U CN203203729 U CN 203203729U CN 201320228803 CN201320228803 CN 201320228803 CN 201320228803 U CN201320228803 U CN 201320228803U CN 203203729 U CN203203729 U CN 203203729U
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Abstract
The utility model provides an intelligent low-power-consumption electromagnetic heat energy meter including an LCM display screen, a 32-bit CPU operation module, a serial transmission interface module, a switch power source module, a band-pass filter, a voltage signal instrument amplifier, a temperature signal instrument amplifier, a sensor power source driving circuit, an electromagnetic sensor and a temperature sensing rod. The intelligent low-power-consumption electromagnetic heat energy meter employs advanced excitation technology for producing magnetic fields, suppresses differential interference produced by low-frequency rectangular wave excitation through a digital band-pass filtering circuit and adopts the RS485 serial transmission interface module, so that the intelligent low-power-consumption electromagnetic heat energy meter has advantages that the intelligent low-power-consumption electromagnetic heat energy meter is immune to noises, wide in common-mode range, appropriate in data transmission rate and capable of multi-point transmission. Requirements for transmitting data stably in a fairly long distance can be met. By adopting designs of a synchronous sampling pulse circuit and an innovative excitation coil, electric supply interference is avoided, the measurement precision is high and integral consumption of an electromagnetic flow gauge is reduced.
Description
Technical field
The utility model relates to low power consumption and low noise excitation mode measuring apparatus, particularly a kind of intelligent low consumpting power electromagnetic heat meter.
Background technology
Since the reform and opening-up, the national economy rapid growth, " scientific and technical innovation, autonomous innovation " become the main flow of present domestic industry development, and China's industry is just progressively to the future development of intensive style, energy-saving and emission-reduction, low-carbon (LC).1831, M.Faraday at first found the law of electromagnetic induction, and utilized the magnetic field of the earth to measure the river discharge of road by the Thames in next year, not success.This is the experimental study of electromagnetic flowmeter the earliest in history, has opened the prelude of electromagnetic flowmeter research.Nineteen thirty, the theory that fluid can cause the induced electricity potential difference by magnetic field is applied to flow measurement, and makes electromagnetic type flow meter.Initial stage is used the blood be confined to medical domain and measures, until generation nineteen fifty, electromagnetic type flow meter is applied to the measurement of more industrial fluid flows gradually in large quantities, such as regenerated fiber viscose, sand, water, mud, various chemical fluid raw materials ... etc.Electromagnetic type flow meter is through the development of seven more than ten years, and application is very extensive, particularly the industrial circles such as oil, chemical industry, metallurgy, weaving, food, water conservancy construction.Along with industrial expansion, more and more higher to the requirement of the accuracy of flow measuring and scope, in order to adapt to various uses, for also having proposed lifting and transition of flow measurement technology Secretary.The flowmeter development of China mostly is confined to mechanical flowmeter, and electromagnetic type flow meter not yet successfully is developed and then is applied to industrial circle, and the market demand all is dependent on import, and is expensive.The industrial flow instrument of the flowmeter of peddling in the market mainly contains eddy-current flowmeter, differential pressure flowmeter, variable area formula flowmeter, volumeter, ultrasonic flowmeter etc.Swirlmeter is to see through the excessive characteristic of putting frequency and the linear proportional relation of flow velocity of overflowing of phenomenon (Vortex Shedding) of putting of eddy current to measure the water yield, carries out sensing via blunt type body and piezoelectric sensor in the pipeline.The principle of operation of differential pressure flowmeter is flow plug to be installed measure flow in the mode that causes fluid-blocking in fluid line.Variable area formula flowmeter is height the measuring as uninterrupted that the acting force of the fluid that flowed from bottom to top by the ball float of measuring in the up big and down small taper caliber moves.The ultrasonic flowmeter is the mistiming of transmitting back and forth generation by measuring sound wave, and this mistiming is directly proportional with rate of flow of fluid, utilizes this phenomenon to measure fluid mean flow rate and flow.Volumeter is by fluid during through the measuring room of a constant volume, and the pressure of fluid or the fluid weight that accumulates in the measuring room can make the indicating mechanism of metering rotating speed move to measure automatically.Eddy-current flowmeter, differential pressure flowmeter, variable area formula flowmeter, volumeter, ultrasonic flowmeter cause because of the limitation of its metering system that the accuracy of measuring is not high, consumed power is larger, noise immunity is low and are stable not high.Electromagnetic type flow meter is to use conductive fluid move in magnetic field and produce induction electromotive force, and induction electromotive force and uninterrupted are directly proportional, and can reflect the size of fluid flow in the pipeline via its induction electromotive force of measurement.Electromagnetic type flow meter is because of its measuring accuracy and sensitivity is higher is widely used just gradually, but it moves in magnetic field by conductive fluid and produce induction electromotive force and measure, and the interference and the power consumption that are vulnerable to electricity are larger.In order to address this problem, the technician of R﹠D institution and enterprise is constantly exploring, is studying, and wishes to develop a kind of novel electromagnetic flowmeter, although make some progress, still exists the technical barrier that not yet overcomes in practice.
Summary of the invention
The purpose of this utility model is to overcome above deficiency, and a kind of intelligent low consumpting power electromagnetic heat meter is provided.Designed in conjunction the forming of theory that this electric energy meter uses the law of electromagnetic induction and fluid can cause the induced electricity potential difference by magnetic field, adopt advanced excitatory technology to produce magnetic field, the differential that suppresses the excitatory generation of low frequency square wave by the digital band pass filtering circuit disturbs, adopt RS485 serial transmission interface module, have the noise immunity, broad common mode range, message transmission rate suitably and the advantage such as multicast communication ability, satisfy the requirement of the lower stable transfer data of quite long distance, adopt the synchronized sampling pulsing circuit, the magnetizing coil design of innovation, avoid the generation of civil power interference phenomenon, measuring accuracy is high, has reduced the consumption of the integral body of electromagnetic type flow meter.
The technical scheme that its technical matters that solves the utility model adopts is: comprise the LCM display screen, 32 bit CPU computing modules, the serial transmission interface module, switch power module, bandpass filter, the voltage signal instrumentation amplifier, the temperature signal instrumentation amplifier, the sensor electrical source driving circuit, electromagnetic sensor, sensing rod for temperature, electromagnetic sensor is connected to the voltage signal instrumentation amplifier, the voltage signal instrumentation amplifier is connected to bandpass filter, bandpass filter is connected to 32 bit CPU computing modules, 32 bit CPU computing modules are connected to the sensor electrical source driving circuit, and the sensor electrical source driving circuit is connected to electromagnetic sensor; Sensing rod for temperature is connected to the temperature signal instrumentation amplifier, and the temperature signal instrumentation amplifier is connected to 32 bit CPU computing modules; 32 bit CPU computing modules are connected to the LCM display screen, have formed a kind of intelligent low consumpting power electromagnetic heat meter.
The know-why that its technical matters that solves the utility model adopts is: the utility model adopts the excitatory mode of low frequency square wave, and disturbs for the differential that the excitatory waveform of this kind produces, and proposes the digital band pass filtering circuit and suppresses.Electromagnetic sensor detects the signal of flow behind the voltage signal instrumentation amplifier, by bandpass filter noise is filtered again, send correct signal to 32 bit CPU computing modules, behind the signal process temperature signal instrumentation amplifier that platinum resistance sensing rod for temperature senses on the other hand, after processing, 32 bit CPU computing modules deliver to the LCM display screen, various data are shown on the LCM display screen, the data of 32 bit CPU computing modules also can be via the serial transmission interface module, with data transmission to long-range keyholed back plate.Adopt alternating current to turn the direct current switch power module, but the burning voltage circuit make the interior environment of heat energy meter more stable.The RS485 technology has to noise immunity, broad common mode range, message transmission rate suitably and the advantage such as multicast communication ability, adopts RS485 serial transmission interface module, can satisfy quite length apart from the requirement of lower stable transfer data.Sensing rod for temperature is two, is used for respectively measuring coolant-temperature gage and inflow temperature.Platinum stability is high, thermal conductivity good, and is antiacid, corrosion resistivity is stronger, adopts PT1000 Ω platinum sensing rod for temperature, can adapt to most rugged surroundings requirements, the serviceable life of increase heat energy meter.The signal that this heat energy meter arrives two electrode measurements obtains flow signal through processing such as instrumentation amplifier and bandpass filter, and the relation that can present intimate linearity by size and the uninterrupted that shows output voltage values reaches the requirement of pinpoint accuracy measurement.Take excitatory technology to produce magnetic field, have advantages such as can not producing eddy effect, orthogonal interference and homophase interference, do not produce polarization effect, be convenient to amplifying signal and process, and can avoid the generation of the problems such as zero point drift, stability of direct current amplifier.This electromagnetic flowmeter has temperature sensor self-sensing broken string alarm function and in opposite directions indicated number of flow, adopt magnetizing coil design and the mode of serial transmission of innovation, make the consumed power of electromagnetic type flow meter integral body extremely low, be about 5W and itself also be energy-conserving product.The maximum measurement range of this product is wide to reach 1500: 1, the scope that is used for the reflection flow velocity is 0.01m/s to 15m/s, input impedance is higher than 1000M Ω, offset voltage is the highest to only have 50 μ V, drift current is the highest to only have 5nA, and common mode rejection ratio can up to 120dB, have good temperature stability, gain can freely be selected definite, and Single-end output improves the common mode rejection ratio value of whole Circuits System.Meanwhile, this heat energy meter adopts the design of synchronized sampling pulsing circuit, be the integral multiple in civil power cycle or civil power cycle because of its sample period, its mean value equals zero, even be mixed with like this interference of civil power in the flow meter signal, do not play effect yet, avoided city's electrical interference, improve the accuracy of measuring.
The beneficial effects of the utility model: designed in conjunction the forming of theory that this electric energy meter uses the law of electromagnetic induction and fluid can cause the induced electricity potential difference by magnetic field, adopt advanced excitatory technology to produce magnetic field, the differential that suppresses the excitatory generation of low frequency square wave by the digital band pass filtering circuit disturbs, adopt RS485 serial transmission interface module, have the noise immunity, broad common mode range, message transmission rate suitably and the advantage such as multicast communication ability, satisfy the requirement of the lower stable transfer data of quite long distance, adopt the synchronized sampling pulsing circuit, the magnetizing coil design of innovation, avoid the generation of civil power interference phenomenon, measuring accuracy is high, has reduced the consumption of the integral body of electromagnetic type flow meter.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further described:
Fig. 1 is a kind of intelligent low consumpting power electromagnetic heat meter circuit theory diagrams.
In the drawings: 1.LCM display screen, 2.32 bit CPU computing modules, 3. serial transmission interface module, 4. bandpass filter, 5. voltage signal instrumentation amplifier, 6. switch power module, 7. temperature signal instrumentation amplifier, 8. sensor electrical source driving circuit, 9. sensing rod for temperature, 10 electromagnetic sensors.
Embodiment
In the drawings: electromagnetic sensor 10 is connected to voltage signal instrumentation amplifier 5, voltage signal instrumentation amplifier 5 is connected to bandpass filter 4, bandpass filter 4 is connected to 32 bit CPU computing modules 2,32 bit CPU computing modules 2 are connected to sensor electrical source driving circuit 8, and sensor electrical source driving circuit 8 is connected to electromagnetic sensor 10; Sensing rod for temperature 9 is connected to temperature signal instrumentation amplifier 7, and temperature signal instrumentation amplifier 7 is connected to 32 bit CPU computing modules 2; 32 bit CPU computing modules 2 are connected to LCM display screen 1, have formed a kind of intelligent low consumpting power electromagnetic heat meter.
The utility model adopts the excitatory mode of low frequency square wave, and disturbs for the differential that the excitatory waveform of this kind produces, and proposes the digital band pass filtering circuit and suppresses.Electromagnetic sensor 10 detects the signal of flow behind voltage signal instrumentation amplifier 5, by bandpass filter 4 noise is filtered again, send correct signal to 32 bit CPU computing modules 2, behind the signal process temperature signal instrumentation amplifier 7 that platinum resistance sensing rod for temperature 9 senses on the other hand, after processing, 32 bit CPU computing modules 2 deliver to LCM display screen 1, various data are shown on the LCM display screen 1, the data of 32 bit CPU computing modules 2 also can be via serial transmission interface module 3, with data transmission to long-range keyholed back plate.Adopt alternating current to turn direct current switch power module 6, but the burning voltage circuit make the interior environment of heat energy meter more stable.The RS485 technology has to noise immunity, broad common mode range, message transmission rate suitably and the advantage such as multicast communication ability, adopts RS485 serial transmission interface module 3, can satisfy quite length apart from the requirement of lower stable transfer data.Sensing rod for temperature 9 is two, is used for respectively measuring coolant-temperature gage and inflow temperature.Platinum stability is high, thermal conductivity good, antiacid, corrosion resistivity is stronger, adopt PT1000 Ω platinum sensing rod for temperature 9, can adapt to most rugged surroundings requirements, increase the serviceable life of heat energy meter, the signal that this heat energy meter arrives two electrode measurements obtains flow signal through processing such as instrumentation amplifier and bandpass filter 4, and the relation that can present intimate linearity by size and the uninterrupted that shows output voltage values reaches the requirement of pinpoint accuracy measurement.Take excitatory technology to produce magnetic field, have advantages such as can not producing eddy effect, orthogonal interference and homophase interference, do not produce polarization effect, be convenient to amplifying signal and process, and can avoid the generation of the problems such as zero point drift, stability of direct current amplifier.This electromagnetic flowmeter has temperature sensor self-sensing broken string alarm function and in opposite directions indicated number of flow, adopt magnetizing coil design and the mode of serial transmission of innovation, make the consumed power of electromagnetic type flow meter integral body extremely low, be about 5W and itself also be energy-conserving product.The maximum measurement range of this product is wide to reach 1500: 1, the scope that is used for the reflection flow velocity is 0.01m/s to 15m/s, input impedance is higher than 1000M Ω, offset voltage is the highest to only have 50 μ V, drift current is the highest to only have 5nA, and common mode rejection ratio can up to 120dB, have good temperature stability, gain can freely be selected definite, and Single-end output improves the common mode rejection ratio value of whole Circuits System.Meanwhile, this heat energy meter adopts the design of synchronized sampling pulsing circuit, be the integral multiple in civil power cycle or civil power cycle because of its sample period, its mean value equals zero, even be mixed with like this interference of civil power in the flow meter signal, do not play effect yet, avoided city's electrical interference, improve the accuracy of measuring.
Claims (1)
1. intelligent low consumpting power electromagnetic heat meter, comprise the LCM display screen, 32 bit CPU computing modules, the serial transmission interface module, switch power module, bandpass filter, the voltage signal instrumentation amplifier, the temperature signal instrumentation amplifier, the sensor electrical source driving circuit, electromagnetic sensor, sensing rod for temperature, it is characterized in that: electromagnetic sensor is connected to the voltage signal instrumentation amplifier, the voltage signal instrumentation amplifier is connected to bandpass filter, bandpass filter is connected to 32 bit CPU computing modules, 32 bit CPU computing modules are connected to the sensor electrical source driving circuit, and the sensor electrical source driving circuit is connected to electromagnetic sensor; Sensing rod for temperature is connected to the temperature signal instrumentation amplifier, and the temperature signal instrumentation amplifier is connected to 32 bit CPU computing modules; 32 bit CPU computing modules are connected to the LCM display screen, have formed a kind of intelligent low consumpting power electromagnetic heat meter.
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| CN 201320228803 CN203203729U (en) | 2013-04-15 | 2013-04-15 | Intelligent low-power-consumption electromagnetic heat energy meter |
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| CN 201320228803 CN203203729U (en) | 2013-04-15 | 2013-04-15 | Intelligent low-power-consumption electromagnetic heat energy meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107782468A (en) * | 2016-08-30 | 2018-03-09 | 济南瀚舟电子技术有限公司 | A kind of electromagnetic heat meters |
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- 2013-04-15 CN CN 201320228803 patent/CN203203729U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107782468A (en) * | 2016-08-30 | 2018-03-09 | 济南瀚舟电子技术有限公司 | A kind of electromagnetic heat meters |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130918 Termination date: 20160415 |
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| CF01 | Termination of patent right due to non-payment of annual fee |