CN108613708A - A kind of miniature intrinsic safety ultrasonic gas flowmeter - Google Patents
A kind of miniature intrinsic safety ultrasonic gas flowmeter Download PDFInfo
- Publication number
- CN108613708A CN108613708A CN201810754443.8A CN201810754443A CN108613708A CN 108613708 A CN108613708 A CN 108613708A CN 201810754443 A CN201810754443 A CN 201810754443A CN 108613708 A CN108613708 A CN 108613708A
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- CN
- China
- Prior art keywords
- circuit
- ultrasonic
- ultrasonic sensor
- sensor
- signal
- 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.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/662—Constructional details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/14—Casings, e.g. of special material
Abstract
The invention discloses a kind of miniature intrinsic safety ultrasonic gas flowmeter, including communicating pipe, it is connected with shell on communicating pipe, is provided with the first ultrasonic sensor and the second ultrasonic sensor in communicating pipe on different cross section；Transmitter circuit plate, the first ultrasonic sensor and the second ultrasonic sensor are provided with outside communicating pipe in shell to be electrically connected with transmitter circuit plate respectively by cable；Contracting stream platform is provided in communicating pipe.The precision for improving the detection of gas low-speed or high-speed improves the safety of fuel gas detection；By accurate time difference measurements, keep the measurement of time more accurate, to obtain higher measurement accuracy.
Description
Technical field
The present invention relates to a kind of gas flow measurement instrument, more particularly to a kind of miniature intrinsic safety ultrasonic gas flow measurement
Instrument.
Background technology
With city and industrial expansion, demand of the people to coal gas, natural gas and industrial combustion gas etc. is growing day by day, gas
The measuring technique of flow measurement is increasingly valued by people.It is a can be so more accurate, convenient and stable that measure various gas
The flowmeter of body is particularly important.
Invention content
The goal of the invention of the present invention is：In view of the above problems, a kind of miniature intrinsic safety ultrasonic gas stream is provided
Flowmeter solves gas dosing recycling when volatile oil and gas recycling, solves the safety measured when fuel gas recycling
Sex chromosome mosaicism.
The technical solution adopted by the present invention is as follows：
A kind of miniature intrinsic safety ultrasonic gas flowmeter, including communicating pipe are connected with shell, phase in communicating pipe on communicating pipe
The first ultrasonic sensor and the second ultrasonic sensor are provided on different cross section；Outside communicating pipe pick-up is provided in shell
Device circuit board, the first ultrasonic sensor and the second ultrasonic sensor are electrically connected with transmitter circuit plate respectively by cable；
Contracting stream platform is provided in communicating pipe.
Further, described the invention discloses a kind of preferred structure of miniature intrinsic safety ultrasonic gas flowmeter
Internal diameter in communicating pipe at the first ultrasonic sensor of setting and the second ultrasonic sensor be more than the first ultrasonic sensor and
The diameter of second ultrasonic sensor；Contracting stream platform includes leading flow curve, rear water conservancy diversion curve, and leading flow curve forms the first ultrasound
Wave sensor flows the drainage channel of platform to contracting, and rear water conservancy diversion curve forms contracting stream platform to the drainage channel of the second ultrasonic sensor.
Further, the leading flow curve and rear water conservancy diversion curve include the inclined-plane for connecting two different tube diameters, and inclined-plane inclines
Rake angle is 43 ° -48 °, and the junction of inclined-plane and different tube diameters is circular curve, and the radius of circular curve is 2.5mm-3.5mm.
Further, the transmitter circuit plate include processor, time-to-digit converter, signal detection switching circuit,
Sensor receives and dispatches control circuit, telecommunication circuit, power circuit, processor and telecommunication circuit, power circuit, driving circuit, time
Digital quantizer, signal detection switching circuit, sensor transmitting-receiving control circuit signal are connected.
Further, the transmitter circuit plate includes secondary signal modulate circuit, processor and time-to-digit converter
Signal is connected, and time-to-digit converter is connected with the input end signal of secondary signal modulate circuit, secondary signal modulate circuit
Input terminal is connected with the signal output end of signal detection switching circuit, the control signal and processor of signal detection switching circuit
Signal is connected.
Further, the transmitter circuit plate includes the first primary signal modulate circuit, the second primary signal conditioning electricity
Road, the first primary signal modulate circuit, the second primary signal modulate circuit are ultrasonic with the first ultrasonic sensor and second respectively
Wave sensor, which corresponds, to be connected；Sensor transmitting-receiving control circuit is by cable and the first ultrasonic sensor and the second surpasses
Acoustic wave sensor signal is connected, and the control signal of sensor transmitting-receiving control circuit is connected with processor signal.
Further, the telecommunication circuit includes pulse communication interface circuit, RS485 communication interface circuits；The power supply
Circuit includes power interface and intrinsic safety processing circuit, the load electricity that power interface passes through intrinsic safety processing circuit and transmitter circuit plate
Connection.
Further, the transmitter circuit plate includes temperature sensing circuit, and connection inside pipe wall is provided with temperature sensor,
Temperature sensor is connected by lead with temperature sensing circuit signal, and temperature sensing circuit is connected with processor signal.
Further, cable tube is connected on the shell, transmitter circuit plate is connected by cable with the external world；It is described
Communicating pipe includes gas vent and gas access, and the bore of gas vent and gas access is the connector of 008-025.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1. by the way that the present invention is arranged, the precision of gas low-speed or high-speed detection is improved, improves the safety of fuel gas detection
Property；And without mechanical oscillation, system is safe and reliable.
2. by accurate time difference measurements, keep the measurement of time more accurate, to obtain higher measurement accuracy.
3. being designed using intrinsic safety type, it is not necessarily to Explosion-proof host, wiring is simple, and installation maintenance is at low cost.
Description of the drawings
Fig. 1 is schematic structural view of the invention；
Fig. 2 is circuit structure block diagram of the present invention；
Fig. 3 is to measure flow passage structure schematic diagram；
It is marked in figure：1 is shell, and 2 be transmitter circuit plate, and 3 be communicating pipe, and 4 be gas vent, and 5 be the second supersonic sensing
Device, 6 be the first ultrasonic sensor, and 7 be gas access, and 8 be cable tube, and 9 be to measure flow, and 10 be contracting stream platform, and 11 be leading
Flow curve, 12 be rear water conservancy diversion curve.
Specific implementation mode
Below in conjunction with the accompanying drawings, the present invention is described in detail.
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1-Figure 3, the present invention includes communicating pipe 3, is provided with shell 1 outside communicating pipe 3, communicating pipe 3 outer enclosure 1
It is internally provided with transmitter circuit plate 2, the second ultrasonic sensor 5 and first is provided at the varying cross-section in communicating pipe 3
Ultrasonic sensor 6, the second ultrasonic sensor 5 and the first ultrasonic sensor 6 pass through lead and 2 signal of transmitter circuit plate
It is connected.Communicating pipe 3 is made of aluminium alloy or stainless steel, and shell 1 is made of flame retardant plastics or metal, explosion-proof for improving its
Performance.Second ultrasonic sensor 5 and the first ultrasonic sensor 6 can receive or send ultrasonic wave, and can will receive
Ultrasonic wave be converted into electric signal and send, or corresponding ultrasonic wave is emitted according to the telecommunication signal that receives.
Contracting stream platform 10 is provided in communicating pipe 3, the first ultrasonic sensor 6 of setting and the second ultrasonic wave pass in communicating pipe 3
Internal diameter at sensor 5 is more than the diameter of the first ultrasonic sensor 6 and the second ultrasonic sensor 5；Contracting stream platform 10 includes leading
Flow curve 11, rear water conservancy diversion curve 12, leading flow curve 11 form the drainage channel that the first ultrasonic sensor 6 flows platform 10 to contracting,
Water conservancy diversion curve 12 forms the drainage channel of the 10 to the second ultrasonic sensor of contracting stream platform 5 afterwards.Leading flow curve 11 and rear water conservancy diversion are bent
Line 12 includes the inclined-plane of two different tube diameters of connection, and the angle of inclination on inclined-plane is 45 °, and the junction of inclined-plane and different tube diameters is circular arc
The radius of curve, circular curve is 3mm.In this way, the flow velocity of the Measurement channel formed in the stream platform 10 that contracts is uniform, inner wall is reduced in
The current difference of the heart improves measurement accuracy, reduces measurement error.
Transmitter circuit plate 2 includes processor, time-to-digit converter, signal detection switching circuit, sensor transmitting-receiving control
Circuit processed, telecommunication circuit, power circuit, processor and telecommunication circuit, power circuit, driving circuit, time-to-digit converter, letter
Number detection switching circuit, sensor transmitting-receiving control circuit signal be connected.Transmitter circuit plate 2 includes secondary signal modulate circuit,
Processor is connected with time-to-digit converter signal, the input end signal phase of time-to-digit converter and secondary signal modulate circuit
Even, the input terminal of secondary signal modulate circuit is connected with the signal output end of signal detection switching circuit, signal detection switching electricity
The control signal on road is connected with processor signal.Transmitter circuit plate 2 includes the first primary signal modulate circuit, the second primary
Signal conditioning circuit, the first primary signal modulate circuit, the second primary signal modulate circuit respectively with the first ultrasonic sensor 6
It is connected with the second ultrasonic sensor 5 one-to-one correspondence；The sensor transmitting-receiving control circuit is passed by lead and the first ultrasonic wave
Sensor 6 is connected with 5 signal of the second ultrasonic sensor, and sensor receives and dispatches the control signal and processor signal phase of control circuit
Even.
When specifically used, equipment is mounted on the circulation duct of gas, equipment power-on and receiver.
Carrying out practically process, processor control sensor and receive and dispatch control circuit, and sensor receives and dispatches control circuit control first
Ultrasonic sensor 6 and the second ultrasonic sensor 5 alternately send and receive ultrasonic signal；First ultrasonic sensor, 6 He
Second ultrasonic sensor 5 is by the first primary signal modulate circuit, the second primary signal modulate circuit to the signal that receives
It is sent to secondary signal modulate circuit after being handled, time-to-digit converter is sent to after the processing of secondary signal modulate circuit.
When the first ultrasonic sensor 6, which emits the second ultrasonic sensor 5, to be received, time-to-digit converter automatically detects this
Time value pass to processor, when the first ultrasonic sensor 6 receive the second ultrasonic sensor 5 send when, automatically by this
The secondary time value detected passes to processor.Processor calculates the propagation time Ts of sound wave fair current in the medium, adverse current
Propagation time Tn.
There are following two states when work：
1. the first ultrasonic sensor 6 is in emission state, the second ultrasonic sensor 5 is in reception state, then measures arteries and veins
It is punched in the propagation time Ts of fair current in measured medium.
2. the second ultrasonic sensor 5 is in emission state, the first ultrasonic sensor 6 is in reception state, then surveys
Measure the propagation time Tn of pulse adverse current in measured medium.
Flow velocity can be calculated by following methods：
Ts=L/（ν0+ν*cosθ）；
Tn=L/（ν0-ν*cosθ）；
ΔT=（Tn-Ts）；
ΔT=Tn-Ts=L/(ν0-ν*cosθ)-L/(ν0+ν*cosθ)
=2*L*ν*cosθ/(ν0²-ν²*cosθ²)；
ν≈ ΔT*ν0² / 2*L*cosθ；
Flow Q is calculated according to the internal diameter D of measurement pipe：
Q =K* (πD² / 4) * ν；
Ts --- ultrasonic wave downstream propagation times, unit are the second (s)；
Tn--- ultrasonic wave adverse current propagation times, unit are the second (s)；
Δ T --- adverse current time Ts and fair current time Tn are poor：Tn-Ts, unit are the second (s)；
L--- ultrasonic transmission distances, unit are rice (m)；
The spread speed of ν 0 --- ultrasonic wave in a fluid, unit are metre per second (m/s) (m/s)；
The flowing velocity of ν --- measured medium, unit are metre per second (m/s) (m/s)；
The angle of the flow direction and ultrasonic propagation direction of θ --- measured medium, unit are degree (°)；
K--- pipeline flow correction factors carry out error correction；
Q--- pipeline flows, unit are cubic meters per second (m/s)；
D--- pipeline inside diameters, unit are rice (m)；
This is arrived, the flow Q for flowing through pipeline is calculated.
Embodiment 1：
On the basis of embodiment of above, a kind of preferred implementation side of miniature intrinsic safety ultrasonic gas flowmeter is disclosed
Formula.
The telecommunication circuit includes pulse communication interface circuit, RS485 communication interface circuits；The power circuit includes electricity
Source interface and intrinsic safety processing circuit, power interface are electrically connected by intrinsic safety processing circuit with the load of transmitter circuit plate 2.Using
Pulse communication interface circuit can improve communication bandwidth and communication efficiency, and then improve sample rate, improve measurement accuracy.
The transmitter circuit plate 2 includes temperature sensing circuit, and temperature sensing circuit is connected with processor signal.Communicating pipe
3 inner walls are provided with temperature sensor, and temperature sensor is connected by lead with temperature sensing circuit signal.It is examined by the way that temperature is arranged
Electric energy is surveyed, the operating temperature for setting the second ultrasonic sensor 5 and the first ultrasonic sensor 6 can be detected, thus can know that
The output characteristics of second ultrasonic sensor 5 and the first ultrasonic sensor 6, and determine the spy of the transmission sound of detected gas
Property, and then result is modified, improve measurement accuracy.The temperature detection electric energy includes temperature detection sensor 4, temperature inspection
It surveys sensor 4 and realizes temperature acquisition, processor is supplied to carry out temperature adjustmemt.
Embodiment 2：
On the basis of with embodiment 1, a kind of preferred embodiment of miniature intrinsic safety ultrasonic gas flowmeter is disclosed.
Cable tube 8 is connected on shell 1, transmitter circuit plate 2 is connected by cable with the external world；The communicating pipe 3 wraps
Include gas vent 4 and gas access 7, gas vent 4 and gas access 7 are that the bore of gas vent 4 and gas access 7 is equal
For the aluminum alloy joint of 008-025.Present embodiment uses the connector of 008 bore.Gas vent 4 and gas access 7 use spiral shell
Line connector is connected with pipeline.
Transmitter mainboard meets the Explosion-proof Design requirement of GB3836.The degree of protection of shell 1 reaches IP65 ranks.
Embodiment 3：
As shown in figure 3, the leading flow curve 11 and rear water conservancy diversion curve 12 and the angle, θ of communicating pipe 3 of contracting stream platform 10 are 45 °, transition
The arc radius of junction is 3mm.Under the action of hydrodynamics, the air-flow for flowing through contracting stream platform 10 will not be because of tube wall viscosity
And current difference and turbulent flow are generated, the Uniform gas flow velocity of entire cross section.In this way, can maximumlly ensure Measurement channel air-flow
Uniformity ensures the accuracy measured.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (9)
1. a kind of miniature intrinsic safety ultrasonic gas flowmeter, it is characterised in that：Including communicating pipe（3）, communicating pipe（3）Upper company
It is connected to shell（1）, communicating pipe（3）It is provided with the first ultrasonic sensor on interior different cross section（6）It is passed with the second ultrasonic wave
Sensor（5）；Communicating pipe（3）Shell（1）Inside it is provided with transmitter circuit plate（2）, the first ultrasonic sensor（6）With the second surpass
Sonic sensor（5）By lead respectively with transmitter circuit plate（2）Electrical connection；Communicating pipe（3）Inside it is provided with contracting stream platform（10）.
2. a kind of miniature intrinsic safety ultrasonic gas flowmeter as described in claim 1, it is characterised in that：The communicating pipe
（3）The first ultrasonic sensor of interior setting（6）With the second ultrasonic sensor（5）The internal diameter at place is more than the first ultrasonic sensor
（6）With the second ultrasonic sensor（5）Diameter；Contracting stream platform（10）Including leading flow curve（11）, rear water conservancy diversion curve（12）, preceding
Water conservancy diversion curve（11）Form the first ultrasonic sensor（6）Platform is flowed to contracting（10）Drainage channel, rear water conservancy diversion curve（12）It is formed
Contracting stream platform（10）To the second ultrasonic sensor（5）Drainage channel.
3. a kind of miniature intrinsic safety ultrasonic gas flowmeter as claimed in claim 2, it is characterised in that：The preceding water conservancy diversion
Curve（11）With rear water conservancy diversion curve（12）The angle of inclination on the inclined-plane including connecting two different tube diameters, inclined-plane is 43 ° -48 °, inclined-plane
Junction with different tube diameters is circular curve, and the radius of circular curve is 2.5mm-3.5mm.
4. a kind of miniature intrinsic safety ultrasonic gas flowmeter as described in claim 1, it is characterised in that：The transmitter
Circuit board（2）Including processor, time-to-digit converter, signal detection switching circuit, sensor transmitting-receiving control circuit, communication electricity
Road, power circuit.
5. a kind of miniature intrinsic safety ultrasonic gas flowmeter as claimed in claim 4, it is characterised in that：The transmitter
Circuit board（2）Including secondary signal modulate circuit, the input end signal phase of time-to-digit converter and secondary signal modulate circuit
Even, the signal output end of signal detection switching circuit is connected with the input terminal of secondary signal modulate circuit, signal detection switching electricity
The control signal on road is connected with processor signal.
6. a kind of miniature intrinsic safety ultrasonic gas flowmeter as claimed in claim 5, it is characterised in that：The transmitter
Circuit board（2）Including the first primary signal modulate circuit, the second primary signal modulate circuit, the first primary signal modulate circuit,
Second primary signal modulate circuit respectively with the first ultrasonic sensor（6）With the second ultrasonic sensor（5）Correspond phase
Even；The sensor transmitting-receiving control circuit passes through cable and the first ultrasonic sensor（6）With the second ultrasonic sensor（5）Letter
Number be connected, sensor transmitting-receiving control circuit control signal be connected with processor signal.
7. a kind of miniature intrinsic safety ultrasonic gas flowmeter as claimed in claim 4, it is characterised in that：The communication electricity
Road includes pulse communication interface circuit, RS485 communication interface circuits；The power circuit includes power interface and intrinsic safety processing electricity
Road, power interface pass through intrinsic safety processing circuit and transmitter circuit plate（2）Load electrical connection.
8. a kind of miniature intrinsic safety ultrasonic gas flowmeter as claimed in claim 4, it is characterised in that：The transmitter
Circuit board（2）Including temperature sensing circuit, communicating pipe（3）Inner wall is provided with temperature sensor, temperature sensor by lead with
Temperature sensing circuit signal is connected, and temperature sensing circuit is connected with processor signal.
9. a kind of miniature intrinsic safety ultrasonic gas flowmeter as described in claim 1, it is characterised in that：The shell
（1）On be connected with cable tube（8）, transmitter circuit plate（2）It is connected with the external world by cable；The communicating pipe（3）Including gas
Body exports（4）The gas access and（7）, gas vent（4）The gas access and（7）Bore be 008-025 connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810754443.8A CN108613708A (en) | 2018-07-11 | 2018-07-11 | A kind of miniature intrinsic safety ultrasonic gas flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810754443.8A CN108613708A (en) | 2018-07-11 | 2018-07-11 | A kind of miniature intrinsic safety ultrasonic gas flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108613708A true CN108613708A (en) | 2018-10-02 |
Family
ID=63666270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810754443.8A Withdrawn CN108613708A (en) | 2018-07-11 | 2018-07-11 | A kind of miniature intrinsic safety ultrasonic gas flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108613708A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967076A (en) * | 2018-09-30 | 2020-04-07 | 成都安迪生测量有限公司 | Miniature intrinsically safe oil gas recovery ultrasonic gas flow measuring instrument |
| CN113138231A (en) * | 2021-04-13 | 2021-07-20 | 武汉理工大学 | Ultrasonic phased array detection device and method for aero-engine case ring forging |
-
2018
- 2018-07-11 CN CN201810754443.8A patent/CN108613708A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967076A (en) * | 2018-09-30 | 2020-04-07 | 成都安迪生测量有限公司 | Miniature intrinsically safe oil gas recovery ultrasonic gas flow measuring instrument |
| CN113138231A (en) * | 2021-04-13 | 2021-07-20 | 武汉理工大学 | Ultrasonic phased array detection device and method for aero-engine case ring forging |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181002 |