CN1217162C - Compensation type thermal type gas quality flow meter - Google Patents
Compensation type thermal type gas quality flow meter Download PDFInfo
- Publication number
- CN1217162C CN1217162C CN 02132939 CN02132939A CN1217162C CN 1217162 C CN1217162 C CN 1217162C CN 02132939 CN02132939 CN 02132939 CN 02132939 A CN02132939 A CN 02132939A CN 1217162 C CN1217162 C CN 1217162C
- Authority
- CN
- China
- Prior art keywords
- resistance
- operational amplifier
- electric bridge
- platinum resistance
- platinum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The present invention relates to a compensating thermal type gas mass flowmeter, which relates to a meter for measuring gas flow rates. The compensating thermal type gas mass flowmeter comprises a measured pipeline (2) and a reference chamber (3) and a signal collecting circuit (1) of the measured pipeline, wherein the reference chamber (3) is arranged on one side of the measured pipeline (2), and is reserved with an edge gap (3-1) and an edge gap (3-2) so that the reference chamber (3) is communicated with the measured pipeline (2); a platinum resistor Rt#-[1] is arranged in the measured pipeline (2), and a platinum resistor Rt#-[2] and a platinum resistor Rt#-[3] are arranged in the reference chamber (3) of the measured pipeline; the signal collecting circuit (1) is composed of a main electric bridge (1-1), an auxiliary electric bridge (1-2) and a signal comparison circuit (1-3). The present invention has the advantages that the measurement is accurate and stable; the accuracy of the measurement can not be decreased because of the changes of temperatures, pressures and components of the gases; a zero point is stable in different conditions.
Description
Technical field: the instrument that the present invention relates to a kind of measurement gas flow.
Background technology: the thermal mass flow meter of current metering gas flow must be demarcated through the real gas of real stream, and the composition of gas, pressure, variation of temperature all can be brought influence to instrument output in use.Especially can export difference with the difference of gaseous tension, temperature, composition the zero point of instrument.Conventional thermal type gas quality flow meter is to use the hot wire anemometer principle, a warmed-up platinum filament is placed in the gas, when increasing, gas velocity will take away more heat from platinum filament, thereby the platinum filament temperature is descended, and cause the platinum filament resistance value to descend, determine the size of gas velocity according to the size of resistance value decline.Mode and gas ingredients, pressure, temperature all have certain relation but this kind tests the speed, and especially when gas does not flow, because the composition of gas or pressure, temperature variation will obviously cause the change of instrument zero output, therefore the precision of measuring is not high.
Summary of the invention: the present invention has designed a kind of compensation type thermal type gas quality flow meter, it adopts doube bridge circuit compensation method, when the pressure of gas, temperature, when composition changes, all can guarantee the stable of zero point, the present invention also can stablize under different conditions, the flow of measurement gas accurately thereby make.The present invention has comprised tested pipeline 2, and it has also comprised the reference cell 3 and the signal acquisition circuit 1 of tested pipeline, and reference cell 3 is installed on the side of tested pipeline 2, and leaves limit crack 3-1, another crack, limit 3-2, and reference cell 3 is communicated with tested pipeline 2; Platinum resistance R
T1Be installed in the tested pipeline 2 platinum resistance R
T2, platinum resistance R
T3Be installed in the reference cell 3 of tested pipeline; Signal acquisition circuit 1 is made up of main electric bridge 1-1, secondary electric bridge 1-2, signal comparator circuit 1-3; Main electric bridge 1-1 is by secondary electric bridge 1-1-1, resistance R in the main electric bridge
1And platinum resistance R
T1Form, the secondary electric bridge 1-1-1 in the main electric bridge is by resistance R
4, R
5, R
6, platinum resistance R
T2, triode Q and operational amplifier A
1Form; Secondary electric bridge 1-2 is by resistance R
2, R
3, platinum resistance R
T3Form; Signal comparator circuit 1-3 is by two operational amplifier A
2, A
3, Darlington transistor T forms; The collector of Darlington transistor T connects+Ec, and the emitter of Darlington transistor T meets single-chip microcomputer U
1A/D converter IC
1Signal input part, the base stage of Darlington transistor T connects operational amplifier A
2Output terminal, operational amplifier A
2In-phase input end connecting resistance R
2, R
4, platinum resistance R
T2An end and operational amplifier A
3Inverting input, resistance R
2The other end meet single-chip microcomputer U
1A/D converter IC
1Signal input part, operational amplifier A
2Inverting input connecting resistance R
1An end and platinum resistance R
T1An end, resistance R
1The other end meet single-chip microcomputer U
1A/D converter IC
1Signal input part, platinum resistance R
T1Other end ground connection; Platinum resistance R
T2Another termination operational amplifier A
1In-phase input end and the collector of triode Q, resistance R
4Another termination operational amplifier A
1Inverting input and resistance R
5An end, resistance R
5Other end ground connection, operational amplifier A
1Signal output part through resistance R
6Connect the base stage of triode Q, the grounded emitter of triode Q; Operational amplifier A
3In-phase input end connecting resistance R
3An end and platinum resistance R
T3An end, resistance R
3The other end meet single-chip microcomputer U
1A/D converter IC
1Signal input part, platinum resistance R
T3Other end ground connection, operational amplifier A
3Signal output part meet single-chip microcomputer U
2A/D converter IC
2Signal input part.R when work
T1Pass to big electric current, make its temperature exceed the measured medium certain numerical value; R
T2Be placed in the immobilising measured medium, be used for measuring the actual temperature of air-flow; Electric current makes R during work
T3Temperature and R
T1Temperature identical, R just
T3Being installed in does not have in the actuating medium that flows, promptly with R
T1Be in same media, uniform temp, the uniform pressure environment, difference only is R
T1Be to be placed in the tested pipeline 2 of gas flow, and R
T3Be to be placed in the immobilising reference cell 3 of gas R
T3Electric current output sent in amplifier A
3In go to amplify, compensate because the influence that gaseous tension, temperature, composition variation bring with its output; Guarantee R by the secondary electric bridge 1-1-1 in main electric bridge 1-1, the main electric bridge in the work
T1Temperature be higher than R all the time
T2(identical with medium temperature) fixed temperature is so that will be from R during gas flow
T1On take away corresponding heat.This heat and tested flow velocity keep positive relation-changing, by platinum resistance R
T1Temperature variation, cause platinum resistance R
T1Resistance change and the variation of electric current.The output valve of secondary electric bridge 1-1-1 in main electric bridge 1-1, the main electric bridge is sent into amplifier A
2Amplify, finally adjust the output current of Darlington transistor T, and feed back to resistance R
1, R
2, R
3With single-chip microcomputer U
1A/D converter IC
1, guarantee to provide one to make R
T1Temperature be higher than R
T2The electric current of temperature one setting, this electric current and tested flow velocity have certain corresponding relation, deliver to single-chip microcomputer U
1A/D converter IC
1Change, send into single-chip microcomputer U again
2Carry out data processing and output; The present invention has measurement accurately, and is stable; The accuracy of measurement is descended.It also has the advantage of zero point stability under different condition.
Description of drawings: Fig. 1 is an electrical block diagram of the present invention, and Fig. 2 is platinum resistance R among the present invention
T1, R
T2, R
T3Be installed in the structural representation in tested airflow line 2 and the reference cell 3, Fig. 3 is the vertical view of Fig. 2.
Embodiment: this embodiment is made up of tested pipeline 2, reference cell 3 and signal acquisition circuit 1, and reference cell 3 is installed on the side of tested pipeline 2, and leaves limit crack 3-1, and another crack, limit 3-2 makes reference cell 3 communicate with tested pipeline 2; Platinum resistance R
T1Be installed in the tested pipeline 2 platinum resistance R
T2, platinum resistance R
T3Be installed in the reference cell 3 of tested pipeline; Signal acquisition circuit 1 is made up of main electric bridge 1-1, secondary electric bridge 1-2, signal comparator circuit 1-3; Main electric bridge 1-1 is by secondary electric bridge 1-1-1, resistance R in the main electric bridge
1And platinum resistance R
T1Form, the secondary electric bridge 1-1-1 in the main electric bridge is by resistance R
4, R
5, R
6, platinum resistance R
T2, triode Q and operational amplifier A
1Form; Secondary electric bridge 1-2 is by resistance R
2, R
3, platinum resistance R
T3Form; Signal comparator circuit 1-3 is by two operational amplifier A
2, A
3, Darlington transistor T forms; Operational amplifier A
1, A
2, A
3Be the LM402 model, the collector of Darlington transistor T connects+Ec, and the emitter of Darlington transistor T meets single-chip microcomputer U
1A/D converter IC
1Signal input part, the base stage of Darlington transistor T connects operational amplifier A
2Output terminal, operational amplifier A
2In-phase input end connecting resistance R
2, R
4, platinum resistance R
T2An end and operational amplifier A
3End of oppisite phase go into end, resistance R
2The other end meet single-chip microcomputer U
1A/D converter IC
1Signal input part, operational amplifier A
2Inverting input connecting resistance R
1An end and platinum resistance R
T1An end, resistance R
1The other end meet single-chip microcomputer U
1A/D converter IC
1Signal input part, platinum resistance R
T1Other end ground connection; Platinum resistance R
T2Another termination operational amplifier A
1In-phase input end and the collector of triode Q, resistance R
4Another termination operational amplifier A
1Inverting input and resistance R
5An end, resistance R
5Other end ground connection, operational amplifier A
1Signal output part through resistance R
6Connect the base stage of triode Q, the grounded emitter of triode Q; Operational amplifier A
3In-phase input end connecting resistance R
3An end and platinum resistance R
T3An end, resistance R
3The other end meet single-chip microcomputer U
1A/D converter IC
1Signal input part, platinum resistance R
T3Other end ground connection, operational amplifier A
3Signal output part meet single-chip microcomputer U
2A/D converter IC
2Signal input part.
Claims (1)
1, compensation type thermal type gas quality flow meter, comprised tested pipeline (2), it is characterized in that it has also comprised reference cell of tested pipeline (3) and signal acquisition circuit (1), reference cell (3) is installed on the side of tested pipeline (2), and leave crack, a limit (3-1), another crack, limit (3-2), reference cell (3) is communicated with tested pipeline (2); Platinum resistance R
T1Be installed in the tested pipeline (2) platinum resistance R
T2, platinum resistance R
T3Be installed in the reference cell (3) of tested pipeline; Signal acquisition circuit (1) is made up of main electric bridge (1-1), secondary electric bridge (1-2), signal comparator circuit (1-3); Main electric bridge (1-1) is by secondary electric bridge (1-1-1), resistance R in the main electric bridge
1And platinum resistance Rt
1Form, the secondary electric bridge (1-1-1) in the main electric bridge is by resistance R
4, R
5, R
6, platinum resistance R
T2, triode Q and operational amplifier A
1Form; Secondary electric bridge (1-2) is by resistance R
2, R
3, platinum resistance R
T3Form; Signal comparator circuit (1-3) is by two operational amplifier A
2, A
3, the Linda pipe T that pauses forms; The collector of Darlington transistor T connects+E
C, the emitter of Darlington transistor T meets single-chip microcomputer U
1A/D converter IC
1Signal input part, the base stage of Darlington transistor T connects operational amplifier A
2Output terminal, operational amplifier A
2In-phase input end connecting resistance R
2, R
4, platinum resistance R
T2An end and operational amplifier A
3Inverting input, resistance R
2The other end meet single-chip microcomputer U
1A/D converter IC
1Signal input part, operational amplifier A
2Inverting input connecting resistance R
1An end and platinum resistance R
T1An end, resistance R
1The other end meet single-chip microcomputer U
1A/D converter IC
1Signal input part, platinum resistance R
T1Other end ground connection; Platinum resistance R
T2Another termination operational amplifier A
1In-phase input end and the collector of triode Q, resistance R
4Another termination operational amplifier A
1Inverting input and resistance R
5An end, resistance R
5Other end ground connection, operational amplifier A
1Signal output part through resistance R
6Connect the base stage of triode Q, the grounded emitter of triode Q; Operational amplifier A
3In-phase input end connecting resistance R
3An end and platinum resistance R
T3An end, resistance R
3The other end meet single-chip microcomputer U
1A/D converter IC
1Signal input part, platinum resistance R
T3Other end ground connection, operational amplifier A
3Signal output part meet single-chip microcomputer U
2A/D converter IC
2Signal input part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02132939 CN1217162C (en) | 2002-09-14 | 2002-09-14 | Compensation type thermal type gas quality flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02132939 CN1217162C (en) | 2002-09-14 | 2002-09-14 | Compensation type thermal type gas quality flow meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1414351A CN1414351A (en) | 2003-04-30 |
| CN1217162C true CN1217162C (en) | 2005-08-31 |
Family
ID=4746994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02132939 Expired - Fee Related CN1217162C (en) | 2002-09-14 | 2002-09-14 | Compensation type thermal type gas quality flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1217162C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013021305B3 (en) * | 2013-12-19 | 2014-10-30 | Krohne Messtechnik Gmbh | Circuit arrangement for temperature monitoring and calorimetric mass flowmeter |
-
2002
- 2002-09-14 CN CN 02132939 patent/CN1217162C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1414351A (en) | 2003-04-30 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050831 Termination date: 20091014 |