CN209470738U - A kind of wide range immersion type heat type gas flow measuring device - Google Patents
A kind of wide range immersion type heat type gas flow measuring device Download PDFInfo
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- CN209470738U CN209470738U CN201920491937.1U CN201920491937U CN209470738U CN 209470738 U CN209470738 U CN 209470738U CN 201920491937 U CN201920491937 U CN 201920491937U CN 209470738 U CN209470738 U CN 209470738U
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- 238000007654 immersion Methods 0.000 title claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 20
- 238000013461 design Methods 0.000 claims abstract description 8
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 3
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 10
- 239000003990 capacitor Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Abstract
The utility model relates to a kind of wide range immersion type heat type gas flow measuring devices.It includes sensor circuit, signal processing circuit and one-chip computer module.The output of sensor circuit is connected to one-chip computer module after signal processing circuit, and the sensor circuit designs are Hui Sidun bridge circuit, wherein four thermal resistance Rh1, Rh2, Rh3 and Rh4 in bridge arrangement are first part；Thermal resistance Rh5 and resistance R3 parallel connection are second part；Resistance R4 is in parallel with resistance R5 to be used as Part III, and resistance R6 is in parallel with resistance R7 to be used as Part IV.The utility model is according to thermal gas flowmeter feature designing measuring circuit, pass through the design of the Design and optimization sensor circuit of sensing element, different circuit outputs are taken to different flow range, effectively the small flow of gas is measured, expands the measuring range of traditional immersion thermal gas flowmeter.
Description
Technical field
The utility model belongs to technical field of fluid detection, is related to a kind of immersion type heat type gas flow measuring device.
Background technique
Compared to the method for traditional vane type, turbine type gas flow measurement, heat type gas flow measurement be it is a kind of compared with
Novel gas flow measurement method.The measurement method inhales the thermal discharge theory directly proportional to sole mass from gas, i.e.,
When can be flowed according to detected fluid through between Heat―Film Probe heat transfer and commutative relation obtain tested gas flow.Compare and its
The measuring device of his type, thermal gas flowmeter have responsiveness fast, and sensitivity is excellent, and broad quantum, the pressure loss is small, use
The advantages that service life is long, such flowmeter are also widely used in petrochemical industry, automobile, on the fields such as aerospace.
According to heat type gas flow sensor to gaseous mass principle measured directly, structure can be divided into two types, point
It Wei not immersion type and heat distribution type.For the heat type gas flow sensor of heat distribution type, it is mainly used for i.e. micro- to low flow velocity
The measurement of small flow.And immersion type gas flow sensor is mainly to the measurement of high flow velocities, be applied to more in, in Large Diameter Pipeline,
And the measurement of small flow is often not satisfactory, therefore design a kind of wide range immersion type heat type gas flow measuring device and have
Important meaning.
Summary of the invention
In view of the deficiencies of the prior art, the utility model proposes a kind of measurements of the immersion type heat type gas flow of wide range to fill
It sets.
The utility model includes sensor circuit, signal processing circuit and one-chip computer module, the output warp of sensor circuit
One-chip computer module is connected to after signal processing circuit.
The sensor circuit designs are Hui Sidun bridge circuit, wherein four thermal resistance Rh1 arranged in bridge,
Rh2, Rh3 and Rh4 are first part, and as heat source and temperature sensor, primary flow signal is exported by first part；Thermal resistance
Rh5 and resistance R3 parallel connection are second part, as temperature-compensating；Resistance R4 is in parallel with resistance R5 to be used as Part III, resistance R6
In parallel with resistance R7 to be used as Part IV, the Part III and Part IV play the role of balancing Hui Sidun bridge circuit,
Big flow signal is exported by Hui Sidun bridge circuit.
It furtherly, further include operational amplifier U0, triode Q1, resistance R1 and resistance R2, it is anti-that this constitutes electric current
Part is presented, wherein the negative input of operational amplifier U0 is connect with node O3, the electrode input end and section of operational amplifier U0
The output end of point O4 connection, operational amplifier U0 is connect by resistance R2 with the base stage of triode Q1, the emitter of triode Q1
12V power supply is connect, the collector of triode Q1 is connect with the upper end of Hui Sidun bridge circuit, and resistance R1 is connected in parallel on the collection of triode Q1
Between electrode and emitter, the node O3 is the junction of first part and Part IV in Hui Sidun bridge circuit, institute
The node O4 stated is the junction of second part and Part III in Hui Sidun bridge circuit, the Hui Sidun bridge circuit
Upper end is the junction of first part and second part in Hui Sidun bridge circuit.
Furtherly, described thermal resistance Rh1, Rh2, Rh3, Rh4 and Rh5 use PT1000, and are integrated in same substrate
On.
Furtherly, for small flow output signal, amplifying circuit in signal processing circuit, by more amplifier integrated chips
TLC2254C and resistance are constituted, which is divided into two-stage, and the first order is differential amplification, and the second level is ratio enlargement in the same direction.
For big flow output signal, amplifying circuit in signal processing circuit, by more amplifier integrated chip TLC2254C
It is constituted with resistance, which is divided into two-stage, and the first order is ratio enlargement in the same direction, and the second level is also ratio enlargement in the same direction.
The utility model passes through the Design and optimization of sensing element according to thermal gas flowmeter feature designing measuring circuit
The design of sensor circuit takes different circuit outputs to different flow range, effectively measures to the small flow of gas, expands
The big measuring range of traditional immersion thermal gas flowmeter.
Detailed description of the invention
Fig. 1 is wide range immersion type heat type gas flow measuring device structure principle chart；
Fig. 2 is wide range immersion type heat type gas flow measuring device sensing element schematic diagram；
Fig. 3 is wide range immersion type heat type gas flow measuring device physical circuit figure.
Specific embodiment:
The following is further explained with reference to the attached drawings the utility model proposes a kind of wide range immersion type heat type gas flow survey
Measure device.
As shown in Figure 1, the present embodiment mainly includes sensor circuit, signal processing circuit and one-chip computer module.Sensor
The effect of circuit is the temperature change according to caused by the variation of gas in pipelines flow velocity to be converted to voltage letter output, output letter
Number it is divided into two parts, respectively primary flow signal and big flow signal.Due to the output width of primary flow signal and big flow signal
It is worth inconsistent, needs by corresponding signal processing circuit.Signal processing circuit as shown in the figure is respectively to primary flow signal processing
Circuit and big flow signal processing circuit, and signal processing circuit mainly includes amplifying circuit and filter circuit.At signal
The electric signal of reason circuit finally can just be directly inputted to the A/D module port of single-chip microcontroller, be AD converted, and make the simulation electricity of input
Pressure amplitude value is converted to digital quantity, the digital quantity is tested flow value in single-chip microcontroller internal conversion according to simple operation, finally
It is shown on LCD LCD screen.
Fig. 2 is the sensing element schematic diagram of the present embodiment, which is integrated and same using 5 thermal resistance PT1000
Sensing element designed by one substrate.Wherein 4 thermal resistances Rh1, Rh2, Rh3, Rh4 are as heat source and temperature sensor, and one
Measurement of the thermal resistance Rh5 as gas medium is used for temperature-compensating.The line graph of thermal resistance Rh1, Rh2, Rh3, Rh4, Rh5 is
First part in Fig. 3 in part 1 sensor loop, wherein Rh1 connects with Rh3, Rh2 connect with Rh4 after respectively with Rh5 simultaneously
Connection.
Fig. 3 is the physical circuit figure of the present embodiment.1 is sensor circuit in figure, and the sensor circuit is with sensing element 4
Thermal resistance Rh1, Rh2, Rh3, Rh4 is part 1 as heat source and temperature sensor, Rh5 and R3 parallel connection is part 2 as temperature
Degree compensation, R4 and R5, R6 and R7 are in parallel respectively constitutes third portion and the 4th part play the role of balanced bridge.Wherein the 1st
Divide and the 4th sections in series, part 2 and third portion are connected, obtains Hui Sidun electric bridge sensing circuit through parallel connection after series connection.
Air-flow is answered when there is flow in amplifier U0, triode Q1, resistance R1, R2 composition current feedback part on sensing element
It flows through and temperature is caused to decline, electric bridge is unbalance, then triode conducting electric current increase promotes sensing element to heat up, and it is flat to restore electric bridge
Weighing apparatus.Specific connection are as follows: by the O3 of Hui Sidun electric bridge, O4 node is connected respectively to the 4 of U0 amplifier, 3 pins, the positive and negative confession of amplifier U0
Electric end meets 12V and ground respectively.Amplifier U0 output amplitude is connected to the base stage of triode Q1 through resistance R2, and triode emitter connects
12V power supply, and parallel resistance R1 on emitter and collector, collector are connected to Hui Sidun electric bridge upper end.And designed biography
The signal that sensor circuit generates corresponding different amplitudes to different flow range in pipeline exports.Designed sensor circuit is to small
The corresponding voltage exported when flow measurement is V1, both ends between output par, c Rh1, Rh3 between Rh2, Rh4 are right respectively
It should O1, O2 in figure.The corresponding voltage that centering high flow capacity then exports when measuring is V2, output par, c is part 1, the 4th part it
Between and ground level, respectively correspond O3 in figure, ground level.Output voltage O3 and ground are connected to amplifier through resistance R12, R13
The end 2IN+ and 2IN- of TLC2254C, pin 5,6.
2,3 parts are signal processing circuit in Fig. 3, for the processing to sensor output voltage.2 part in Fig. 3 is realized
Voltage signal amplification.Primary flow signal is exported, sensor circuit signal exports O1, and O2 is connected to through resistance R8, R9 respectively
The end 1IN- and 1IN+ of amplifier TLC2254C carries out first order differential amplification, output end 1OUT.The differential amplifier circuit by
The end 1OUT connects and composes feedback loop, R8 by resistance Rf and the end 1IN-, and R9 is connected to the 1IN- and 1IN+ of amplifier TLC2254C
End, the end 1IN+ are grounded through R10 and constitute.The end 4IN+ that output end 1OUT is input to amplifier TLC2254C through resistance R14 carries out second
Grade ratio enlargement in the same direction, output signal are the end 4OUT v1.The scaling circuit in the same direction passes through resistance R16 and 4IN- by the end 4OUT
End connects and composes feedback loop, R14, and R17 is connected to the end 4IN+ and 4IN- of amplifier TLC2254C, and the end 4IN- is grounded structure through R17
At.
Big flow signal is exported, sensor circuit signal output O3 and ground are connected to fortune through resistance R11, R13 respectively
The end 2IN+ and 2IN- for putting TLC2254C carries out first order ratio enlargement in the same direction, output end 2OUT.The ratio enlargement electricity in the same direction
The routing end 2OUT connects and composes feedback loop, R11 by resistance R12 and the end 2IN-, and R13 is connected to the 2IN+ of amplifier TLC2254C
With the end 2IN-, the end 2IN- is grounded through R13 and constitutes.Output end 2OUT through resistance R15 be input to the end 3IN+ of amplifier TLC2254C into
Row second level ratio enlargement in the same direction, output signal are the end 3OUT v2.The scaling circuit in the same direction passes through resistance R1 by the end 3OUT
Feedback loop, R15 are connected and composed with the end 3IN-, R18 is connected to the end 3IN+ and 3IN- of amplifier TLC2254C, and the end 3IN- is through R18
Ground connection is constituted.
Filtering processing is realized in 3 part in Fig. 3.It is low that by resistance R24 second order is connected to for primary flow signal v1 after amplification
Bandpass filter exports as V1.The second-order low-pass filter is by resistance R24, C2 and R25, and C1 is constituted, after the one end R24 is connected with C2
Ground connection, the one end R25 are connected with the R2 other end, and the other end is connected with the end 4IN+ of U2 and the end C2,4OUT and the 4IN- phase of U2
Connect and compose feedback loop.By resistance R27 second-order low-pass filter is connected to for primary flow signal v2 after amplification, exports and is
V2.By resistance R27, C4 and R26, C3 is constituted the second-order low-pass filter, and the one end R27 is grounded after being connected with C3, the one end R26 and
The R27 other end is connected, and the other end is connected with the end 3IN+ of U2 and the end C3, and the 3OUT of U2 is connected to form with 3IN- to be fed back to
Road.
4 parts are one-chip computer module in Fig. 3.Single-chip microcontroller model MSP430F5438A has one high performance 12
ADC, operating voltage can be by 3.6V to 3.0V.The 13rd foot of single-chip microcontroller connects one end of crystal oscillator Y and one end of capacitor C5, and the 14th foot connects
The other end of crystal oscillator Y and one end of capacitor C6 are connect, the other end of capacitor C5 and C6 are grounded jointly.Single-chip microcontroller the 11st, the 16th, the
64, the 38th, the 87th pin connects 3V voltage, the 12nd, the 15th, the 63rd, the 37th, the 88th pin ground connection.Through signal processing output
Voltage signal V1, V2 connect 97,98 pins of single-chip microcontroller respectively to be AD converted.Resulting digital quantity and reality are sampled according to AD
Flow is fitted, and is obtained tested flow velocity, is shown finally by LCD LCD screen.
According to device experimental conditions, small range of flow is 0.405m3/ h~2.841m3When/h, it is tested gas flow and reality
Marked gas flow is almost the same, big flow range 2.841m3/ h~130.3m3When/h, it is tested gas flow and practical calibration gas
Body flow is almost the same.Compared to traditional type immersion gas flowmeter to the inaccuracy of Small flowrate measurement, V1Amplitude is accurate
The flow of microflow rate gas is reacted, to realize that designed wide range immersion type heat type gas flow measuring device can
In 0.4m3/ h to 130m3To gas flow measurement in the wide range of/h.
Claims (4)
1. a kind of wide range immersion type heat type gas flow measuring device, including sensor circuit, signal processing circuit and monolithic
The output of machine module, sensor circuit is connected to one-chip computer module after signal processing circuit, it is characterised in that: the sensing
Device circuit design is Hui Sidun bridge circuit, wherein four thermal resistance Rh1, Rh2, Rh3 and Rh4 in bridge arrangement are first
Point, as heat source and temperature sensor, primary flow signal is exported by first part；Thermal resistance Rh5 and resistance R3 parallel connection are second
Part, as temperature-compensating；Resistance R4 is in parallel with resistance R5 to be used as Part III, and resistance R6 is in parallel with resistance R7 as the 4th
Point, the Part III and Part IV play the role of balancing Hui Sidun bridge circuit, and big flow signal is by Hui Sidun electric bridge
Circuit output.
2. a kind of wide range immersion type heat type gas flow measuring device according to claim 1, it is characterised in that: also wrap
Operational amplifier U0, triode Q1, resistance R1 and resistance R2 are included, this constitutes current feedback part, wherein operational amplifier
The negative input of U0 is connect with node O3, and the electrode input end of operational amplifier U0 is connect with node O4, operational amplifier U0
Output end connect with the base stage of triode Q1 by resistance R2, the emitter of triode Q1 connects 12V power supply, the collection of triode Q1
Electrode is connect with the upper end of Hui Sidun bridge circuit, and resistance R1 is connected in parallel between the collector and emitter of triode Q1, described
Node O3 be Hui Sidun bridge circuit in first part and Part IV junction, the node O4 be Hui Sidun electric bridge
The junction of second part and Part III in circuit, the upper end of the Hui Sidun bridge circuit are in Hui Sidun bridge circuit
The junction of first part and second part.
3. a kind of wide range immersion type heat type gas flow measuring device according to claim 1 or 2, it is characterised in that:
Described thermal resistance Rh1, Rh2, Rh3, Rh4 and the Rh5 uses PT1000, and is integrated on same substrate.
4. a kind of wide range immersion type heat type gas flow measuring device according to claim 1 or 2, it is characterised in that:
For small flow output signal, amplifying circuit in signal processing circuit, by more amplifier integrated chip TLC2254C and electricity
Resistance is constituted, which is divided into two-stage, and the first order is differential amplification, and the second level is ratio enlargement in the same direction；
For big flow output signal, amplifying circuit in signal processing circuit, by more amplifier integrated chip TLC2254C and electricity
Resistance is constituted, which is divided into two-stage, and the first order is ratio enlargement in the same direction, and the second level is also ratio enlargement in the same direction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920491937.1U CN209470738U (en) | 2019-04-12 | 2019-04-12 | A kind of wide range immersion type heat type gas flow measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920491937.1U CN209470738U (en) | 2019-04-12 | 2019-04-12 | A kind of wide range immersion type heat type gas flow measuring device |
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| CN209470738U true CN209470738U (en) | 2019-10-08 |
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| CN201920491937.1U Active CN209470738U (en) | 2019-04-12 | 2019-04-12 | A kind of wide range immersion type heat type gas flow measuring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Wide-range immersion type thermal gas flow measuring device Effective date of registration: 20200527 Granted publication date: 20191008 Pledgee: Zhejiang Tyrone commercial bank Limited by Share Ltd. Taizhou Wenling branch Pledgor: ZHEJIANG SEARCH INSTRUMENT TECHNOLOGY Co.,Ltd. Registration number: Y2020330000277 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| CP03 | Change of name, title or address |
Address after: 317500 Luhai Road, East New District, Wenling City, Taizhou City, Zhejiang Province Patentee after: Zhejiang Songchuan Instrument Technology Co.,Ltd. Country or region after: China Address before: 317500 Luhai Road, East New District, Wenling City, Taizhou City, Zhejiang Province Patentee before: ZHEJIANG SEARCH INSTRUMENT TECHNOLOGY CO.,LTD. Country or region before: China |