CN202533120U - Wide-range gas flowmeter integrating instrument - Google Patents
Wide-range gas flowmeter integrating instrument Download PDFInfo
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- CN202533120U CN202533120U CN2012201151170U CN201220115117U CN202533120U CN 202533120 U CN202533120 U CN 202533120U CN 2012201151170 U CN2012201151170 U CN 2012201151170U CN 201220115117 U CN201220115117 U CN 201220115117U CN 202533120 U CN202533120 U CN 202533120U
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- microprocessor
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- integrating instrument
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Abstract
The utility model belongs to the technical field of gas flow measurement, and in particular relates to a wide-range gas flowmeter integrating instrument. The wide-range gas flowmeter integrating instrument comprises a microprocessor, a signal acquisition unit, a display unit and a storage device, wherein the signal acquisition unit comprises an amplifier and an analogue-to-digital (A/D) converter, the input end of the amplifier is connected with a temperature sensor and a pressure sensor which are arranged on a gas flowmeter at the same time; the A/D converter is positioned between the amplifier and the microprocessor; the display unit is a liquid crystal display screen which is connected to the microprocessor through a liquid crystal drive circuit; the signal acquisition unit also comprises a gating circuit which is directly connected to the microprocessor; the gating circuit comprises two input ends which are connected to a flow sensor and a thermal acceleration sensor arranged on the gas flowmeter through respective preamplifiers; and the storage device is connected to the microprocessor and is used for storing real-time data and performing permanent storage.
Description
Technical field
The utility model belongs to measurement of gas flow technical field, relates in particular to a kind of wide-range gas meter integrating instrument.
Background technology
At present, all gases flow-meter produced of the flow instrument producer of main flow in the world, because on the measuring principle, the limitation of separate unit instrument flow measurement range.All about 1: 30, the range ability of having only thermal gas flowmeter and Roots type flowmeter is than broad, generally about 1: 200 for general range.And; Because often appearring in the air-flow velocity in the gas pipeline, too fast and slow excessively situation takes place; Surpass the flow rates that instrument can be measured; The air-flow that exceeds measures range generally all can not be noted by flow instrument accurately, and especially less than the situation of range lower limit, even basic sometimes just record is less than flow number.
In order to address the above problem, people are studying the flow instrument of wide-range always, and research direction mainly is through rational technological means the low speed flow below the existing instrument range lower limit accurately to be measured, and does not up to the present also have the adequate solution way.Just because of this, aspect the measurement of air flow rate, often on same pipeline, the instrument parallel connection of different bores is used at present, the instrument of utilizing operation valve to control different bores adapts to different flow rate.Though this way part has solved the problem that existing measuring instrument exists; But because the action of output of the flow signal of instrument and operation valve all needs a surge time; This has brought problem for the accurate measurement of air flow rate; And then, more having caused the significant wastage on starting material and the fabricating yard for the supplying party of air-flow and user have caused inconvenience, the energy-conserving and environment-protective theory of this and world's main flow is conflicted mutually.
In the sensor field solution that a kind of highly sensitive hot acceleration transducer to have occurred be the problems referred to above possibility is provided.Traditional hot accelerometer is based on electric capacity or piezo technology, is used to measure the motion of micromechanics quality structure, and this technology has certain limitation in many aspects, like surface adhesion (be called and stick), hysteresis, mechanical shock, electromagnetic interference (EMI).Expensive and complicated manufacture process also faces the challenge of some and micromechanical motion structurally associated problem; In order to address these problems; MEMSIC develops a kind of unique technique; This technology solved with tradition based on the relevant problem of the accelerometer of MEMS, utilize thermal convection technology, be the thermal convection MEMS inertial sensor of the integrated mixed signal treatment circuit of single-chip of the global first hand CMOS technology of using standard.
Its measuring principle is following: a thermal source that is placed on chip central authorities produces " the hot gas group " of a suspension in this cavity, four thermopair groups of being made up of aluminium and polysilicon are by the equidistant four direction that is placed on thermal source symmetrically simultaneously.When not receiving acceleration or horizontal positioned, its decrease of temperature steepness is center and complete symmetry with the thermal source.At this moment, the voltage that all produces because of temperature sensor is identical of all four thermopair groups is identical.Be a cavity air chamber above, because of nonaccelerated external force effect, the hot gas cumularsharolith is on Centromedian central thermal source.When the effect that receives an acceleration, hot gas group skew, originally the balance of four thermopair groups is destroyed, and its decrease of temperature steepness is to be center and the deviator of △ takes place to the right with the thermal source.Because the transitivity of free convection thermal field; The acceleration of any direction all can be upset the profile of thermal field; Thereby cause it asymmetric, this moment, difference can appear in the output voltage of four thermopair groups, and the difference of this thermopair group output voltage is directly proportional with the acceleration of being responded to.Inner at acceleration transducer, two identical acceleration signal transmission paths are arranged, one is to be used for the acceleration responded on the measured X axle, another then is to be used to measure the acceleration of being responded on the Y axle.
The inside of thermal convection formula acceleration transducer also comprises the simulating signal post processing circuitry of sensor.Through difference amplifications, temperature comparison, analog to digital conversion, digital-to-analog conversion, LPF and buffering, export the simulating signal of having amplified from the thermopair group signal of same axle, both direction; Or, directly process the signal into the I2C connection interface through difference amplification, temperature comparison and analog to digital conversion.Therefore, thermal convection formula acceleration transducer is the SOC(system on a chip) of a multicore sheet, i.e. SOC or MCM.
Device is measured the variation that is produced in the inherent heat transmission by acceleration the structure that has more quality-advantage than the conventional solid-state check and correction is provided; Utilize the gas molecule quality of proofreading because be in the MEMSIC Sensor Design; So the movable machinery structure can be eliminated in accelerometer; The theory bump limit that the MEMSIC accelerometer can bear surpasses 50000g, is 5 times more than of traditional accelerometer, has also eliminated the problem that links to each other with surface adhesion simultaneously.In addition, the MEMSIC accelerometer is not requiring special processing and test, can significantly reduce the cost of OEM, and the CMOS compatible technology of MEMSIC standard possesses high-quality preparative capacibility.Failure rate reduces thousands of times than traditional accelerometer, and such technology and manufacturing capacity have fundamentally been eliminated failure rate and other relevant manufacturing cost.
Exactly because this sensor possesses above-mentioned advantage, apply it to the measurement range problem that can solve existence in the gas flow instrument well.In conjunction with current main-stream all gases flowmeter; Use above-mentioned hot acceleration transducer and can derive multiple combined type wide-range gas meter, like wide-range precession vortex gas meter, Wide Range Gas Turbine Flowmeter, wide-range eddy currents gas meter, wide-range moment formula gas meter, wide-range V bevel-type gas meter etc.
In order to cooperate above-mentioned novel wide-range gas meter, need a kind of corresponding with it wide-range gas meter integrating instrument.
The utility model content
The utility model provides a kind of integrating instrument that is applicable to the wide-range gas meter for solving the technical matters that exists in the known technology.
The technical scheme that the utility model is taked for the technical matters that exists in the solution known technology is: wide-range gas meter integrating instrument comprises microprocessor, signal gathering unit and display unit; Said signal gathering unit comprises amplifier and A/D converter; Said amplifier input terminal is connected to temperature sensor and the pressure transducer that is installed on the gas meter simultaneously, and said A/D converter is between amplifier and said microprocessor; Said display unit is for being connected to the LCDs of said microprocessor through liquid crystal display drive circuit; Said signal gathering unit also comprises a gating circuit that is connected directly to said microprocessor, and its input end is two, and the prime amplifier through separately is connected to flow sensor and the hot acceleration transducer that is installed on the gas meter respectively; Also comprise the storer that is connected to said microprocessor, be used for the storage of real time data and forever preserve.
The utility model can also adopt following technical scheme:
Said microprocessor is MCU.
Said storer is EEPROM EEPROM.
Also comprise the user interface section that is connected to said microprocessor, said user interface section comprises RS485 communication interface, D/A converter and the pulse amplifier that can be connected with subscriber computer or instrument.
Comprise that also the input that is connected to said microprocessor is provided with the unit.
Also comprise the built-in power unit.
Said built-in power unit comprises lithium ion battery.
The advantage that the utlity model has with good effect is: the utility model is through being provided with the gating circuit that directly links to each other with microprocessor; The flow sensor and the hot acceleration transducer that are installed on the gas meter are incorporated into together; Judgement and control through microprocessor; According to different situations gating different sensors work, gating flow sensor when promptly gas flow rate is in the range ability of flow sensor, be lower than the following hot acceleration transducer of gating in limited time of its range ability; Just expand the scope of former flow sensor, solved the problem that the multilist parallel connection brings in the prior art.Storer the real-time storage that has realized data is set, data are written into automatically again behind system's power-down rebooting.Display unit, user interface and input are provided with the unit and have realized man-machine interaction, and be simple to operate, reliable and stable.
Description of drawings
Fig. 1 is the system chart of the utility model.
Embodiment
For further understanding summary of the invention, characteristics and the effect of the utility model, the following examples of giving an example now, and conjunction with figs. specifies as follows:
See also Fig. 1, the utility model comprises MCU microprocessor, signal gathering unit and display unit.Handling procedure is set in the microprocessor, receives from the digital signal of signal gathering unit and carry out high speed monitoring processing; Operating mode in the pipeline is judged and the gating respective sensor; The numerical value that calculates is carried out display process and controls external other unit.
Signal gathering unit comprises amplifier and A/D converter; Amplifier input terminal is connected to the temperature sensor and the pressure transducer that are installed on the gas meter simultaneously and collects the simulating signal that both produce; A/D converter is converted into digital signal with simulating signal between amplifier and microprocessor.
Display unit is for being connected to the LCDs of microprocessor, information such as the temperature in the centralized displaying gas meter, pressure, operating mode, mark condition and accumulative total gas gross through liquid crystal display drive circuit.
Signal gathering unit also comprises a gating circuit that is connected directly to microprocessor; Its input end is two; Prime amplifier through separately is connected to flow sensor and the hot acceleration transducer that is installed on the gas meter respectively, this gating circuit under the control of microprocessor sensor of gating, break off another.
According to the principle of work of hot acceleration transducer, central authorities produce " the hot gas group " of a suspension at chip, and four thermopair groups of being made up of aluminium and polysilicon are by the equidistant four direction that is placed on thermal source symmetrically simultaneously.In order to realize carrying out measurement, need to obtain the relation curve of gas velocity and each thermocouple measuring temperature value through accurate mathematical modeling to gas velocity with this hot acceleration transducer.Because air-flow evenly flows in pipeline, can it be assumed to be the homogeneous medium, on two in four thermopairs of the hot acceleration transducer center lines that are arranged on flowmeter, one near one of inlet near outlet.In flowmeter, do not have air flow stream out-of-date, its decrease of temperature steepness is center and complete symmetry with the thermal source.At this moment, four all thermopair groups all produce identical voltage because of temperature sensor is identical.When air-flow flows through with certain speed; " hot gas group " has the deviator of a △ along gas flow; Promptly upset the profile of thermal field; Thereby cause it asymmetric, difference can appear in the output voltage of two thermopairs on the flowmeter center line at this moment, and the difference of this voltage is directly proportional with the gas velocity of being responded to.Set up the relational model of voltage difference between gas velocity and thermopair thus.
Also comprise the storer that is connected to microprocessor, be used for the storage of real time data and forever preserve that storer is chosen for EEPROM EEPROM.
Also comprise the user interface section that is connected to microprocessor; This user interface section comprises RS485 communication interface, D/A converter and the pulse amplifier that can be connected with subscriber computer or instrument; The user can be connected to computer with this integrating instrument through this interface unit and carry out data and read, analyze, and can connect also that other instrument shows and operation such as advanced treating.
Comprise that also the input that is connected to microprocessor is provided with the unit, comprise equipment such as keyboard, touch-screen, the user is provided with integrating instrument thus.
Also comprise the built-in power unit, wherein adopt lithium ion battery, electric weight is shown by LCDs.
Flow sensor and hot acceleration transducer that this system will be installed on the gas meter are incorporated into together, and its equivalence comes contactless execution to switch for dual sensor input, single microprocessor.Utilize the I2C bus to be connected through gating circuit with little process chip; Doing the real time high-speed monitoring in inside by software program handles; Judging the air-flow velocity in the preceding pipeline, is should be by the flow sensor circuit working or by hot acceleration sensor circuit work according to gating as a result, and always the computing reaction time is between the 2ns-10ns; Through contactless quick switching, automatically perform the range handoff functionality.
Simultaneously, through quality and volume conversion, the driving liquid crystal screen shows, and carries out data storage in real time by EEPROM, next permanent the preservation by microprocessor.
When system powers on for the first time; Carry out self check; The hot acceleration transducer work of the back acquiescence that finishes; And the execution intermittent scanning determines whether that according to current operation result gating switches conventional sensors after detecting flow velocity, understands the user perhaps that the direct labor is provided with the acquiescence sensor states under the prerequisite of flow.Automatically perform relevant gating by instrument then.
Electricity function index:
(1) working power
External power: (8～24) VDC, ripple≤50mV, when inserting external power in the power supply automatic cutout, complete machine is by the external power powered operation.Interior power supply: a joint 3.6V DC lithium battery, screen shows battery electric quantity in real time, and the battery undervoltage warning is arranged, and in time changes with the prompting user.
(2) Overall Power Consumption
External power: Overall Power Consumption≤1W;
Interior power supply: average power consumption≤0.8mW, when being in dormant state, power consumption≤0.2mW.
(3) input signal
Flow signal: (0～2) kHz pulse signal, V
Pp=2.5V;
Temperature signal: by the resistance signal of temperature sensor output;
Pressure signal: by the signal of the mV level of pressure transducer output.
(4) output signal
Output signal (three-wire system): the operating mode pulse signal that directly flow sensor is detected amplifies output, and transmission range≤50m is by external power+24VDC powered operation;
(4～20) mA standard analog signal: (4～20) mA standard analog signal linearity is corresponding to (0～Q
Max) m
3/ h standard volume flow, flow range be by the instrument parameter setting, transmission range≤200m, and the mode of connection is two-wire system or three-wire system, by external power+24V DC powered operation;
The normal flow signal: with the output of pulse signal string mode, the cycle is respectively 5ms, 500ms, and pulse amplitude is about 3V, and normality is a low level, transmission range≤50m, and 0.1m is represented in each pulse respectively
3, 1m
3, be suitable for IC-card system support and use;
The RS485 interface signal: direct and host computer networking, but instrument such as the temperature of teletransmission measured medium, pressure, instantaneous delivery, standard volume total amount have related parameter, failure code, running status and real time data.With the supporting use of special-purpose MODEM, can realize telephonic communication, a special-purpose MODEM can be with 16 flowmeters;
Real-time data base: for satisfying the needs of data management, instrument has the real-time data memory function, comprising:
A) start-stop time of nearest No. 400 flowmeters and corresponding cumulative flow value;
B) the cumulative flow value of every month in nearest 48 months;
C) nearest 300 times state recording number (comprising: time, temperature, pressure, instantaneous delivery, cumulative flow value etc.), can be set at interval time (1min～999min);
More than storage data notebook computer capable of using or desk-top computer reads through the RS485 interface, forms tables of data or curve map for analysis according to user's needs.
Telephone communication network and communication management software: flowmeter and special-purpose MODEM are supporting; Carry out data transmission through telephone line; Can read historical data, the malfunction of any flowmeter in the network and can long-range various flowmeters be set there is related parameter, and the telephonic communication management software can be realized automatic management function according to user's needs.
Claims (7)
1. a wide-range gas meter integrating instrument comprises microprocessor, signal gathering unit and display unit, it is characterized in that:
Said signal gathering unit comprises amplifier and A/D converter, and said amplifier input terminal is connected to temperature sensor and the pressure transducer that is installed on the gas meter simultaneously, and said A/D converter is between amplifier and said microprocessor;
Said display unit is for being connected to the LCDs of said microprocessor through liquid crystal display drive circuit;
Said signal gathering unit also comprises a gating circuit that is connected directly to said microprocessor, and its input end is two, and the prime amplifier through separately is connected to flow sensor and the hot acceleration transducer that is installed on the gas meter respectively;
Also comprise the storer that is connected to said microprocessor, be used for the storage of real time data and forever preserve.
2. according to the described wide-range gas meter of claim 1 integrating instrument, it is characterized in that: said microprocessor is MCU.
3. according to the described wide-range gas meter of claim 1 integrating instrument, it is characterized in that: said storer is EEPROM EEPROM.
4. according to the described wide-range gas meter of claim 1 integrating instrument; It is characterized in that: also comprise the user interface section that is connected to said microprocessor, said user interface section comprises RS485 communication interface, D/A converter and the pulse amplifier that can be connected with subscriber computer or instrument.
5. according to the described wide-range gas meter of claim 1 integrating instrument, it is characterized in that: comprise that also the input that is connected to said microprocessor is provided with the unit.
6. according to each described wide-range gas meter integrating instrument of claim 1 to 5, it is characterized in that: also comprise the built-in power unit.
7. according to the described wide-range gas meter of claim 6 integrating instrument, it is characterized in that: said built-in power unit comprises lithium ion battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201151170U CN202533120U (en) | 2012-03-23 | 2012-03-23 | Wide-range gas flowmeter integrating instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201151170U CN202533120U (en) | 2012-03-23 | 2012-03-23 | Wide-range gas flowmeter integrating instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202533120U true CN202533120U (en) | 2012-11-14 |
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ID=47134298
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201151170U Expired - Fee Related CN202533120U (en) | 2012-03-23 | 2012-03-23 | Wide-range gas flowmeter integrating instrument |
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| Country | Link |
|---|---|
| CN (1) | CN202533120U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620789A (en) * | 2012-03-23 | 2012-08-01 | 天津市胜武仪表技术有限公司 | Wide-range gas flowmeter integrator |
| CN105823714A (en) * | 2016-05-27 | 2016-08-03 | 武汉四方光电科技有限公司 | Wearable dust detection device and method |
| CN107300397A (en) * | 2016-04-16 | 2017-10-27 | 上海华电闵行能源有限公司 | Intelligent flow calculus instrument |
-
2012
- 2012-03-23 CN CN2012201151170U patent/CN202533120U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620789A (en) * | 2012-03-23 | 2012-08-01 | 天津市胜武仪表技术有限公司 | Wide-range gas flowmeter integrator |
| CN107300397A (en) * | 2016-04-16 | 2017-10-27 | 上海华电闵行能源有限公司 | Intelligent flow calculus instrument |
| CN105823714A (en) * | 2016-05-27 | 2016-08-03 | 武汉四方光电科技有限公司 | Wearable dust detection device and method |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20160323 |