CN108593024A - Civilian ultrasonic wave gas meter - Google Patents
Civilian ultrasonic wave gas meter Download PDFInfo
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- CN108593024A CN108593024A CN201810576184.4A CN201810576184A CN108593024A CN 108593024 A CN108593024 A CN 108593024A CN 201810576184 A CN201810576184 A CN 201810576184A CN 108593024 A CN108593024 A CN 108593024A
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- 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
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Abstract
The present invention discloses a kind of civilian ultrasonic wave gas meter, and gas meter, flow meter is emitted/received switch unit, ultrasonic exciting unit, ultrasonic wave receiving unit, energy converter integral structure unit by data processing and control communication unit, time measuring unit, ultrasonic wave and formed.Data processing and control communication unit adjust ultrasonic wave and emit/receive the switching of switch unit, and transmitting/receiving channel of time measuring unit receives dual-purpose energy converter through ultrasonic exciting/receiving unit, the transmitting ＆ for being respectively connected to energy converter integral structure unit.The integral structure of n shape test tube integrated transducers, the suitable caliber of test tube horizontal section length overcome that ultrasonic wave propagation path is short, established angle non-900Defect；Ultrasonic propagation velocity is corrected according to observed temperature, compression time receives window, improves interference rejection ability and measurement accuracy；Microelectronics IC achievements are based oneself upon, design ultrasonic wave emits/receive switching circuit and threshold value zero cross detection circuit, and circuit is simple and reliable.
Description
Technical field
The invention belongs to the technology scopes of gas flow detection；It particularly relates to based on Time-difference Ultrasonic Flow detection technique
Domestic gas table.
Background technology
The conservative discreet value of the year two thousand twenty, Chinese energy demand is 5,000,000,000 tons of standard coals.Meet the demand, either increases
Domestic energy supply still utilizes foreign resources, and energy resource supply side will face immense pressure.Coal in China is produced for main energy resource structure
The remote hyperenvironment capacity of raw pollution, environment undertake power and will meet the serious challenge；Therefore, the leading unreasonable energy knot of adjustment coal
Structure is very urgent.Under the conditions of being the prior art for coal with gas, the strong behave curbed environmental pollution.
Natural gas is paid close attention to as clean energy resource, and consumption figure persistently rises.2001, natural gas domestic consumption amount
Only 27,400,000,000 m3；2012, increase to 147,100,000,000 m3, use the prefecture-level city quantity ＞ 210 of natural gas, 200,000,000 compatriots Shou Megumi.It cuts
Only in December, 2012, domestic gas table ownership exceed 20,750,000；10,000,000/year of gas meter, flow meter yield exports 2,500,000/year；
Domestic domestic gas table enterprise about 100, leading products are diaphragm gas meters.Diaphragm gas meter has over one hundred year history, 1833
The diaphragm gas meter framework of Britain James Bo Gedasi inventions follows so far；Mechanical diaphragm gas meter principle is simple, and price is low
It is honest and clean
(90~140 yuan), 1.5 grades of precision；But the price for digitizing diaphragm gas meter is several times as much as base table, it is expensive
(450~550 yuan).
Ultrasonic wave gas flowmeter accuracy is high, crushing is small, and O＆M is easy, movement-less part is highly reliable；After orifice flowmeter,
After turbine flowmeter, become the third legal measurement instrument of combustion gas for assigning trade settlement qualification；For example, during the whole world is longest
State send on feed-line in western gas east, configures 13 sets of ultrasonic wave natural gas flowmeters.The ultrasonic flowmeter factory of current developed country
Quotient occupies the superiority of technological precedence, and there are U.S. Controlotron, Germany Krohne, Britain Daniel and lotus in famous enterprise
Blue Instromet etc..The standard that industry follows is：1998, IS0 issued IS0/TR12765《With time Law of Communication ultrasonic flow rate
Meter measures the fluid flow in closed conduct》；National standard GB/T18604--2001《Natural gas flow is measured with gas ultrasonic flowmeter
Amount》, professional standard《Domestic ultrasonic gas meter, flow meter》2012-2016T-JB.Developed country's ultrasonic measurement flow it is with a long history,
O.Rutten Deutsche Bundespatents in 1931 can be traced back to；The civilian ultrasonic wave gas meter batch of above-mentioned country puts into operation for many years, obtains
Original achievement.The research of China's ultrasonic flowmeter starts from the sixties, domestic ultrasonic flowmeter and developed country PK, precision
There is certain gap with reliability, import ultrasonic flowmeter is full of domestic market.Although Zhejiang prestige star instrument system is integrated
The units such as Co., Ltd release one after another ultrasonic wave gas meter, also obtain type approval certificate；Regrettably market recognition is limited,
The commercialization of product is had got long long way to go.
The principle of ultrasonic measurement flow is：When ultrasonic wave is propagated in a fluid, ultrasonic signal is by Fluid modulation；Therefore
The flow velocity and flow value of fluid can be extracted by detecting the ultrasonic signal modulated.Classified according to modulation parameter, ultrasonic flow
Measurement method has propagation speed differential method (time difference, phase difference, frequency difference), beam deviation method, Doppler method, correlation method, space filtering
And Noise Method etc.；Wherein time difference method application is most universal.Classified according to the mounting means of ultrasonic flowmeter transducer, is divided into outer clip
Formula, plug-in type, pipeline section type.External-clamping type ultrasonic flowmeter is subdivided into according to probe mounting means and ultrasonic wave propagation path
V, Z, N, W method etc..The time difference ultrasonic fluid flow velocity of external clamping V methods is calculated as follows
In formula：T1-- downstream propagation times, t2-- adverse current propagation times；D-- tube wall diameters；θ -- ultrasonic wave propagation path
With tube wall angle.Existing achievement in research and the process conditions of basing on our country overcome the people by the Curve guide impeller of ultrasonic flowmeter
With the not good enough Nan Questions of ultrasonic flowmeter precision；It cuts, dissects one by one civilian from V method time difference ultrasonic fluid velocity formulas herein
The source of ultrasonic flowmeter error is by and proposing corresponding solution.Without loss of generality, the civilian supersonic flow based on the cities XX
The expansion of gauge typical condition is discussed.
Register one's residence the caliber d=30mm, 0.025~4m of user's gas flow of gas supply pipe3/ h, Reynolds number 66.15-
10584.53。
Register one's residence combustion gas caliber d=30mm, and the propagation path of ultrasonic wave is very short；And ultrasonic wave air borne under standard state
Speed c=331.4m/s；Obviously, the measurement accuracy of the unfavorable flow of too short propagation path.If being inserted into one in gas supply pipe
Segment length L》The n shape test tubes of D, and energy converter is installed at the both ends of test tube horizontal segment；The L of test tube horizontal segment is quite managed when flow measurement
Diameter D, the very short inherent shortcoming of propagation path are expected to be resolved.
The measurement accuracy and energy converter established angle θ (ultrasonic wave incidence angle) of external clamping V, Z, N, W method are related, it is contemplated that super
It can be reflected at tube wall and fluid boundary when sound wave incident, i.e., θ errors will generate dual measurement error.If n shape test tubes
Energy converter is installed at the both ends of horizontal segment, and θ=90 ° mounting process is simple, precision is guaranteed, and 90 ° of incidences are again without refraction effect；Therefore n
The integral structure of shape test tube integrated transducer helps and eliminates the dual measurement error that established angle θ errors generate.
There are serious decaying and distortions when ultrasonic wave is propagated in combustion gas, and larger ultrasonic wave transmission power is necessary
, therefore ultrasonic wave receiving terminal can be interfered by transmitting terminal and external noise environment；Usual ultrasonic wave receiving terminal introduces the " time
Receive window " technology shielding interference, i.e. ultrasonic wave transmitting end signal arrival destination time t00.6~1.5 times when open and
Close receiving circuit.Related with temperature in view of ultrasonic propagation velocity, acquisition real time temperature corrects ultrasonic propagation velocity U, and U is pressed
Following formula calculates
U=U0×(1+T/273)0.5=331.4 × (1+T/273)0.5 (2)
Existing mainstream [0.6t0, 1.5t0) time receive window then can be compressed to (0.8t0, 1.2t0), boosting supersonic flow
The improvement of gauge anti-interference ability and precision.
Acoustic impedance between ultrasonic transducer and combustion gas mismatches, and acoustic impedance is selected to be situated between piezoelectric ceramics and combustion gas
Acoustic matching layer material between matter, matching layer thickness take ultrasonic wavelength 1/4；In n shape test tube integrated transducer integral structures,
Energy converter category plug-in installation, not only without external clamping ultrasonic attenuation signal the drawbacks of, but also substantially completion is inserted into
Formula installs inconvenient, heavy workload short slab；Improve ultrasonic flowmeter precision.
Studies have shown that pulse ultrasonic wave is emitted to the real time t=t of receptionVery+ ε+ζ+ω, tVeryTransmitting extremely receives
Theoretical time, ε circuit delay times, ζ counter time errors, ω random noises error (meeting normal distribution)；From mathematics
The visual angle of statistics is considered, and multiple-pulse measurement method can reduce ε, ζ, ω to tVeryIt influences, further increases the essence of ultrasonic flowmeter
Degree.
The civilian more representational intellectual property Summary on research results of ultrasonic wave gas meter is as follows：
Patent of invention " a kind of ultrasonic wave gas meter mixed signal processing circuit " (ZL201410140147.0) proposes one
Kind ultrasonic wave gas meter mixed signal processing circuit carries out ultrasonic signal peak value by automatic gain fuzzy control circuit real
When adjust.
Patent of invention " a kind of ultrasonic flow gas chamber in ultrasonic gas meter, flow meter " (ZL20131008498 5.6),
It is proposed that a kind of ultrasonic flow gas chamber in ultrasonic gas meter, flow meter, gas chamber change the mounting means such as traditional V-type, X-type, formed
The correlation measuring route of long range.
It is above-mentioned to benefit our pursuits, propose that automatic gain fuzzy control circuit adjusts ultrasonic signal peak value in real time, but mix
Signal processing circuit realizes that less reliable, complexity are excessively high, function is limited by analog device；It is proposed long range correlation
Measuring route gas chamber, but air chamber structure is complicated, influence gas flow field distribution and corresponding countermeasure is vacant, and underlying straight pipe cavity is easy
It stays sundries, influence measurement accuracy.Therefore, exploring has certain reference value, but there are still limitations for achievement；It need to be in the base that is both fruitful
Make further innovative design on plinth.
Invention content
The purpose of the present invention is overcome the deficiencies of the prior art and provide a kind of civilian ultrasonic wave gas meter.Particular technique side
Case is as follows：
A kind of civilian ultrasonic wave gas meter, which is characterized in that civilian ultrasonic wave gas meter is communicated by data processing and control
Unit, time measuring unit, ultrasonic wave emit/receive switch unit, ultrasonic exciting unit, ultrasonic wave receiving unit, transducing
Device integral structure unit forms；Data processing and control communication unit switch with time measuring unit, ultrasonic wave transmitting/reception
Unit is connected, ultrasonic wave emit/receive switch unit and time measuring unit, ultrasonic exciting unit, ultrasonic wave receiving unit,
Energy converter integral structure unit is connected.
Data processing and control communication unit control time measuring unit operation, read access time measuring unit output when
Between aberration measurements, pass through data processing and control the data processing of communication unit and control module generates gas flow and combustion gas
Amount, the bluetooth communication through data processing and control communication unit upload gas flow and gas quantity；Data processing and control
Communication unit control ultrasonic wave emits/receives disconnection and the closure of switch unit analog switch, the transmitting of time measuring unit/connect
Receipts channel emits/receives switch unit through ultrasonic wave and is respectively connected to ultrasonic exciting unit, ultrasonic wave receiving unit；Ultrasonic wave swashs
Encourage unit, ultrasonic wave receiving unit emit through ultrasonic wave/receive switch unit, be respectively connected to energy converter integral structure unit
1st transmitting ＆ receives dual-purpose energy converter, the 2nd transmitting ＆ receives dual-purpose energy converter or the 2nd transmitting ＆ receives dual-purpose energy converter, the 1st hair
It penetrates ＆ and receives dual-purpose energy converter.
Preferably, the data processing and control communication unit include using MSP430F135 chips as the data of core at
Reason and control module, the bluetooth communication of model BLE-CC41-A, MSP430F135 feet 32,33 respectively with BLE-CC41-A feet
2,1 is connected；The time difference measurements value of data processing and the output of control module scavenging period measuring unit, based on the time after cleaning
Difference data seeks the gas quantity that gas flow rate and gas flow, flow accumulation obtain, and gas flow is uploaded through bluetooth communication
And gas quantity.
Preferably, using TDC_GP21 chips as core, TDC_GP21 feet 4,21,28 are grounded the time measuring unit,
Foot 14,29 meets Vcc, R230、C230、R240One end be connected pin 17,18, R230The other end be connected with foot 20,19, C230It is another
One end is grounded, R240The other end be connected with foot 24,23；TDC_GP21 feet 8,9,10,11,12 respectively with data processing and control
The MSP430F135 feet 27,28,31,29,30 of module are connected；R210、C210One end ultrasonic wave transmitting/reception switching that is connected it is single
The ADG1234 feet 3, R of member210The other end be connected with the foot 5 of TDC_GP21, C210The other end be connected with foot 30；R220、C220's
One end ultrasonic wave that is connected emits/receives the ADG1234 feet 8, R of switch unit220The other end be connected with TDC_GP21 feet 6,
C220The other end be connected with TDC_GP21 feet 27；Foot 5, the foot 30 of TDC_GP21 forms a ultrasonic wave channel, TDC_GP21's
Foot 6, foot 27 form another ultrasonic wave channel；R240Model Pt1000 platinum resistance thermometer sensor,s, acquisition fuel gas temperature T.
Preferably, the ultrasonic wave emits/receives switch unit using ADG1234 chips as core, and ADG1234 passes through foot
3,8 are connected with time measuring unit；ADG1234 feet 1,10,11,20,15 respectively with data processing and control module
MSP430F135 feet 44,45,46,47,48 are connected, ADG1234 feet 2 and 9, foot 13 Urge_ with ultrasonic exciting unit respectively
The end In, Urge_Out is connected, Receive_In, the Receive_ with ultrasonic wave receiving unit respectively of ADG1234 feet 18, foot 4 and 7
The ends Out are connected, and ADG1234 feet 12 and 15, foot 14 and 17 receive two with the 1st transmitting ＆ of energy converter integral structure unit respectively
It is received dual-purpose energy converter with energy converter, the 2nd transmitting ＆ and is connected；
Ultrasonic wave emits/receives switch unit execution TDC_GP21 feet 5 and 30 ultrasonic wave channel of foot, foot 6 and foot 27 are another
The transmitting in ultrasonic wave channel/receiving channel switching, the dual-purpose energy converter of the 1st transmitting ＆ receptions of execution energy converter integral structure unit,
2nd transmitting ＆ receives transmitting/reception energy converter switching of dual-purpose energy converter；Two groups of transmitting/receptions in ultrasonic wave channel and energy converter
Switching, two groups of given values of corresponding four-way single pole double throw analog switch ADG1234 chip controls feet are corresponding to two groups of given values
ADG1234 on off states see the table below：
When control terminal is given value 1,30 ultrasonic wave channel of TDC_GP21 feet 5 and foot, foot 6 and 27 another ultrasonic wave of foot are logical
Road, the 1st transmitting ＆ receive dual-purpose energy converter, the 2nd transmitting ＆ receive dual-purpose energy converter information flow it is as follows：TDC_GP21 feet 5 export
200KHZ square-wave signals are to ADG1234 feet D1, D1 and S1A closure, through ultrasonic exciting unit to ADG1234 feet D3, D3 and S3A
It is closed, the 1st transmitting ＆ of signal driving of S3A outputs receives dual-purpose energy converter and emits ultrasonic wave；2nd transmitting ＆ receives dual-purpose energy converter
It receives the 1st transmitting ＆ and receives the ultrasonic signal of dual-purpose energy converter transmitting, output to ADG1234 feet S4B, S4B and D4 closure, warp
Ultrasonic wave receiving unit is closed to S2B, S2B and D2, and the signal of D2 outputs is to TDC_GP21 feet 6；
When control terminal given value 2,30 ultrasonic wave channel of TDC_GP21 feet 5 and foot, foot 6 and 27 another ultrasonic wave of foot are logical
Road, the 1st transmitting ＆ receive dual-purpose energy converter, the 2nd transmitting ＆ receive dual-purpose energy converter information flow it is as follows：TDC_GP21 feet 5 export
200KHZ square-wave signals are to ADG1234 feet D2, D2 and S2A closure, through ultrasonic exciting unit to ADG1234 feet D3, D3 and S3B
It is closed, the 2nd transmitting ＆ of signal driving of S3B outputs receives dual-purpose energy converter and emits ultrasonic wave；1st transmitting ＆ receives dual-purpose energy converter
It receives the 2nd transmitting ＆ and receives the ultrasonic signal of dual-purpose energy converter transmitting, output to ADG1234 feet S4A, S4A and D4 closure, warp
Ultrasonic wave receiving unit is closed to S2A, S2A and D2, and the signal of D2 outputs is to TDC_GP21 feet 6.
Preferably, the ultrasonic exciting unit includes the MOSFET of IRL3410 insulated-gate types, step-up transformer；
R410、C410、R420One end be connected one end of step-up transformer primary side, R410、C410The other end ground connection, R420Another termination
Vcc；The source electrode ground connection of MOSFET, drain electrode are connected with the other end of step-up transformer primary side, and grid is through R430Access the ends Urge_In；
The both ends parallel connection R on step-up transformer pair side440, one end ground connection on secondary side, the ends other end access Urge_Out on secondary side；Time surveys
The pulse train for measuring 6 mouthfuls of generations of TDC_GP21 feet 5 or foot of unit is inputted by the ends Urge_In, when input pulse high level,
MOSFET is connected, and step-up transformer pair side does not work, when input pulse low level, MOSFET cut-offs, and step-up transformer pair side
Conducting, primary side energy is discharged into secondary side, driving transmitting ＆ receives dual-purpose energy converter transmitting ultrasonic wave.
Preferably, the ultrasonic wave receiving unit includes pre-amplifying module, second order bandpass filtering modules block, threshold value zero passage
Detection module；Pre-amplifying module is using AD8221 programmable-gain amplifiers as core, D511、D512Parallel connected in reverse phase, in parallel one
End and the ends Receive_In, C511One end be connected, the other end in parallel and the ends-Receive_In, C512One end be connected, C511
The other end and R511One end be connected be followed by AD8221 feet 1, R511The other end ground connection, C512The other end and R512One end phase
Company is followed by AD8221 feet 4, R512The other end ground connection；AD8221 feet 8,5,6,7 connect respectively Vcc ,-Vcc, the ends OUT1；Second order
Bandpass filtering modules block is using OPA820 amplifiers as core, R521、R525、C521、C522One end be connected, R521The ends another termination OUT1,
R522With C521、C522The other end be connected, C522The other end ground connection, C521Another termination OPA820 feet 3；R523、R524One end
It is connected, R523The other end ground connection, R524、R525The other end be connected OPA820 feet 6 and the ends OUT2.
Threshold value zero passage detection module includes using the be core binary channels comparator with latch function, the 1 or non-MAX9693
Door, the 2nd nor gate and door, NOT gate, MAX9693 feet 7 are connected with the MSP430F135 feet 26 of data processing and control module,
693 feet 8,10 of MAX9 are connected the ends OUT2, and foot 3,9,14 is grounded；The MSP430F135 feet 58 of data processing and control module with
1st nor gate, the 2nd nor gate an input terminal be connected, the 1st nor gate another input terminal is connected with MAX9693 feet 2, the 1st
Nor gate output end is connected with MAX9693 feet 4；MAX9693 feet 1,16 connect two input terminals with door, the output end with door respectively
Connect the ends Receive_Out, NOT gate input terminal, NOT gate output termination the 2nd nor gate another input terminal；Threshold value zero passage is examined
The information flow of brake is as follows：
A channel
The MSP430F135 of data processing and control module sets the A channel input signal datum of OUT2 end signals
VWith reference to, VWith reference to=threshold value；If the V of A channel input signal end INA+OUT2＞ VWith reference to, VQAOUT=5V, With MSP430F135'sLow level signal inputs the 1st nor gate, nor gate output high level signal, makes
MAX9693 latches enabled foot 4 and enables, triggers latch signal VQA OUT；
Channel B
Channel B input signal end INB+ ground connection, V=VGNDIt is logical that=0, OUT2 signal input channel B datum end INB-, B
Road carries out opposite comparison with A channel；If the V of channel B datum end INB-OUT2＜ 0, VQBOUT=5V, So that MAX9693 is latched, enabled foot 13 is enabled, triggers latch signal VQBOUT；
If the output V of A channelQAOUTThe output V of ＞ 0, channel BQBOUT＞ 0, through exporting high level, the ends characterization OUT2 with door
The zero of signal.
Preferably, the energy converter integral structure unit includes that the 1st transmitting ＆ receives dual-purpose energy converter, the 2nd transmitting ＆
Receive dual-purpose energy converter, the 1st combustion gas bend pipe, the 2nd combustion gas bend pipe, n shape test tubes, the 1st transmitting ＆ receive dual-purpose energy converter by
The 1st energy converter piezoceramic transducer, the 1st energy converter acoustic impedance matching layer composition of LHQ200-3 types, the 2nd transmitting ＆ receive two
It is made of the 2nd energy converter piezoceramic transducer, the 2nd energy converter acoustic impedance matching layer of LHQ200-3 types with energy converter；1st hair
Penetrate ＆ receive dual-purpose energy converter, the 2nd transmitting ＆ receive the left and right end that dual-purpose energy converter is separately mounted to n shape test tube horizontal segments；N shapes are surveyed
Pipe accesses gas supply pipe by the 1st combustion gas bend pipe, the 2nd combustion gas bend pipe.
Compared with the background technology, the present invention, it has an advantageous effect in that：
N shape test tube integrated transducer integral structures, 90 ° of suitable caliber of test tube horizontal section length, energy converter installations, overcome
Ultrasonic wave propagation path is too short, established angle θ ≠ 90 ° defect；Ultrasonic propagation velocity is corrected according to observed temperature, when compression
Between receive window, improve ultrasonic flowmeter anti-interference ability and precision；Base oneself upon microelectronics IC achievements, design ultrasonic wave hair
Switching circuit and threshold value zero cross detection circuit are penetrated/receive, circuit is simple and reliable.
Description of the drawings
Fig. 1 is the functional block diagram of civilian ultrasonic wave gas meter；
Fig. 2 is the circuit diagram of data processing and control communication unit；
Fig. 3 is the circuit diagram of time measuring unit；
Fig. 4 is the circuit diagram that ultrasonic wave emits/receive switch unit；
Fig. 5 is the circuit diagram of ultrasonic exciting unit；
Fig. 6 is the circuit diagram of pre-amplifying module；
Fig. 7 is the circuit diagram of second order bandpass filtering modules block；
Fig. 8 is the circuit diagram of threshold value zero passage detection module；
Fig. 9 is the structural schematic diagram of energy converter integral structure unit 600.
Specific implementation mode
As Figure 1 and Figure 4, civilian ultrasonic wave gas meter is measured single by data processing and control communication unit 100, time
Member 200, ultrasonic wave emit/receive switch unit 300, ultrasonic exciting unit 400, ultrasonic wave receiving unit 500, energy converter one
Body structural unit 600 forms；Data processing and control communication unit 100 emit/connect with time measuring unit 200, ultrasonic wave
It receives switch unit 300 to be connected, ultrasonic wave emits/receive switch unit 300 and time measuring unit 200, ultrasonic exciting unit
400, ultrasonic wave receiving unit 500, energy converter integral structure unit 600 are connected；
The operation of data processing and control 100 control time measuring unit 200 of communication unit, read access time measuring unit
The time difference measurements value of 200 outputs generates combustion by data processing and the data processing of control communication unit 100 and control module
Throughput, the bluetooth communication through data processing and control communication unit 100 upload gas flow；Data processing and control are logical
Letter unit 100 controls disconnection and closure that ultrasonic wave emits/receive 300 analog switch of switch unit, time measuring unit 200
Transmitting/receiving channel emits through ultrasonic wave/receives switch unit 300 and is respectively connected to ultrasonic exciting unit 400, ultrasonic wave reception
Unit 500；Ultrasonic exciting unit 400, ultrasonic wave receiving unit 500 emit/receive switch unit 300 through ultrasonic wave, respectively
The 1st transmitting ＆ for accessing energy converter integral structure unit 600 receives dual-purpose energy converter, the 2nd transmitting ＆ receives dual-purpose energy converter, or
2nd transmitting ＆ receives dual-purpose energy converter, the 1st transmitting ＆ receives dual-purpose energy converter.
As shown in Fig. 2, data processing and control communication unit 100 include using MSP430F135 chips as the data of core at
Reason and control module 110, the bluetooth communication 120 of model BLE-CC41-A, MSP430F135 feet 32,33 respectively with BLE-
CC41-A feet 2,1 are connected；The time difference measurements value of data processing and the output of 110 scavenging period measuring unit 200 of control module, base
Time difference data after cleaning seeks the gas quantity that gas flow rate and gas flow, flow accumulation obtain, through Bluetooth communication mould
Block uploads gas flow and gas quantity.
Illustrate 2：The time difference precision that time measuring unit 200 exports is not only by the non-ideal flow field velocity distribution system of combustion gas
About, and by the not true property of ultrasonic time of flight it is influenced；Therefore, cleaning data are very necessary：Choose the identical similar time
Difference data rejects the excessive time difference data of difference.
As shown in figure 3, time measuring unit 200, using TDC_GP21 chips as core, TDC_GP21 feet 4,21,28 are grounded,
Foot 14,29 meets Vcc, R230、C230、R240One end be connected pin 17,18, R230The other end be connected with foot 20,19, C230It is another
One end is grounded, R240The other end be connected with foot 24,23；TDC_GP21 feet 8,9,10,11,12 respectively with data processing and control
The MSP430F135 feet 27,28,31,29,30 of module 110 are connected；R210、C210One end ultrasonic wave transmitting/reception that is connected cut
Change the ADG1234 feet 3, R of unit (300)210The other end be connected with foot 5, C210The other end be connected with foot 30；R220、C220's
One end ultrasonic wave that is connected emits/receives the ADG1234 feet 8, R of switch unit 300220The other end be connected with foot 6, C220It is another
One end is connected with foot 27；Foot 5, the foot 30 of TDC_GP21 forms a ultrasonic wave channel, and foot 6, the foot 27 of TDC_GP21 form separately
One ultrasonic wave channel；R240Model Pt1000 platinum resistance thermometer sensor,s, acquisition fuel gas temperature T.Ultrasound is corrected according to fuel gas temperature T
Spread speed U=U of the wave under the fuel gas temperature0×【1+T/273】0.5=331.4 ×【1+T/273】0.5；Ultrasonic wave is generated to connect
The time for receiving circuit receives window【0.8t0, 1.2t0】, t0The theoretical time for being ultrasonic signal from transmitting terminal to receiving terminal.
TDC_GP21 receives signal to ultrasonic wave " time receives window " and enables, and improves ultrasonic flowmeter anti-interference ability and essence
Degree.
As shown in figure 4, ultrasonic wave emits/receive switch unit 300 using ADG1234 chips as core, ADG1234 passes through foot
3,8 are connected with time measuring unit 200；ADG1234 feet 1,10,11,20,15 respectively with data processing and control module 110
MSP430F135 feet 44,45,46,47,48 are connected, ADG1234 feet 2 and 9, foot 13 respectively with ultrasonic exciting unit 400
The end Urge_In, Urge_Out be connected, ADG1234 feet 18, foot 4 and 7 respectively with the Receive_In of ultrasonic wave receiving unit 500,
The ends Receive_Out are connected, ADG1234 feet 12 and 15, foot 14 and 17 respectively with energy converter integral structure unit 600 the 1st
Emit the dual-purpose energy converter of ＆ receptions, the 2nd transmitting ＆ receives dual-purpose energy converter and is connected；
Ultrasonic wave emits/receives switch unit 300 and executes TDC_GP21 feet 5 and 30 ultrasonic wave channel of foot, foot 6 and foot 27 separately
The transmitting in one ultrasonic wave channel/receiving channel switching executes the 1st transmitting ＆ of energy converter integral structure unit 600 and receives dual-purpose change
Energy device, the 2nd transmitting ＆ receive transmitting/reception energy converter switching of dual-purpose energy converter；Two groups of hairs in ultrasonic wave channel and energy converter
Switching is penetrated/receives, two groups of given values of corresponding four-way single pole double throw analog switch ADG1234 chip controls feet are given with two groups
The corresponding ADG1234 on off states of definite value see the table below：
The ADG1234 on off states corresponding with two groups of given values of table 1
By taking control terminal given value 1 as an example, 30 ultrasonic wave channel of TDC_GP21 feet 5 and foot, foot 6 and 27 another ultrasonic wave of foot are logical
Road, the 1st transmitting ＆ receive dual-purpose energy converter, the 2nd transmitting ＆ receive dual-purpose energy converter information flow it is as follows：TDC_GP21 feet 5 export
200KHZ square-wave signals to ADG1234 feet D1, D1 and S1A be closed, through ultrasonic exciting unit 400 to ADG1234 feet D3, D3 with
S3A is closed, and the 1st transmitting ＆ of signal driving of S3A outputs receives dual-purpose energy converter and emits ultrasonic wave；2nd transmitting ＆ receives dual-purpose change
Energy device receives the 1st transmitting ＆ and receives the ultrasonic signal of dual-purpose energy converter transmitting, exports to ADG1234 feet S4B, S4B and D4 and close
It closes, is closed through ultrasonic wave receiving unit 500 to S2B, S2B and D2, the signal that D2 is exported to TDC_GP21 feet 6；
When control terminal given value 2,30 ultrasonic wave channel of TDC_GP21 feet 5 and foot, foot 6 and 27 another ultrasonic wave of foot are logical
Road, the 1st transmitting ＆ receive dual-purpose energy converter, the 2nd transmitting ＆ receive dual-purpose energy converter information flow it is as follows：TDC_GP21 feet 5 export
200KHZ square-wave signals are to ADG1234 feet D2, D2 and S2A closure, through ultrasonic exciting unit (400) to ADG1234 feet D3, D3
It is closed with S3B, the 2nd transmitting ＆ of signal driving of S3B outputs receives dual-purpose energy converter and emits ultrasonic wave；1st transmitting ＆ receives dual-purpose
Energy converter receives the 2nd transmitting ＆ and receives the ultrasonic signal of dual-purpose energy converter transmitting, exports to ADG1234 feet S4A, S4A and D4 and close
It closes, is closed through ultrasonic wave receiving unit (500) to S2A, S2A and D2, the signal that D2 is exported to TDC_GP21 feet 6.
As shown in figure 5, ultrasonic exciting unit 400 includes MOSFET 410, the step-up transformer of IRL3410 insulated-gate types
420；R410、C410、R420One end be connected one end of 420 primary side of step-up transformer, R410、C410The other end ground connection, R420's
Another termination Vcc；The source electrode ground connection of MOSFET 410, drain electrode are connected with the other end of 420 primary side of step-up transformer, grid warp
R430Access the ends Urge_In；The both ends parallel connection R on the secondary side of step-up transformer 420440, one end ground connection on secondary side, another termination on secondary side
Enter the ends Urge_Out；The pulse train of 6 mouthfuls of generations of TDC_GP21 feet 5 or foot of time measuring unit 200 is defeated by the ends Urge_In
Enter, when input pulse high level, MOSFET 410 is connected, and the secondary side of step-up transformer 420 does not work, when input pulse low level
When, the cut-offs of MOSFET 410, the secondary side conducting of step-up transformer 420, it is dual-purpose that primary side energy is discharged into secondary side, driving emits ＆ receptions
Energy converter emits ultrasonic wave.
As shown in figs 6-8, ultrasonic wave receiving unit 500 include pre-amplifying module 510, second order bandpass filtering modules block 520,
Threshold value zero passage detection module 530；Pre-amplifying module 510 is using AD8221 programmable-gain amplifiers as core, D511、D512Reverse phase
Parallel connection, one end in parallel and the ends Receive_In, C511One end be connected, the other end in parallel and the ends-Receive_In, C512's
One end is connected, C511The other end and R511One end be connected be followed by AD8221 feet 1, R511The other end ground connection, C512The other end
With R512One end be connected be followed by AD8221 feet 4, R512The other end ground connection；AD8221 feet 8,5,6,7 connect respectively Vcc ,-Vcc,
Ground, the ends OUT1；Second order bandpass filtering modules block 520 is using OPA820 amplifiers as core, R521、R525、C521、C522One end be connected, R521
The ends another termination OUT1, R522With C521、C522The other end be connected, C522The other end ground connection, C521Another termination OPA820
Foot 3；R523、R524One end be connected, R523The other end ground connection, R524、R525The other end be connected OPA820 feet 6 and the ends OUT2；
Threshold value zero passage detection module 530 includes the binary channels comparator the 531, the 1st for having using MAX9693 as core latch function
Nor gate 532, the 2nd nor gate 533, with door 534, NOT gate 535, MAX9693 feet 7 and data processing and control module 110
MSP430F135 feet 26 are connected, and 693 feet 8,10 of MAX9, which are connected, is followed by the ends OUT2, and foot 3,9,14 is grounded；Data processing and control mould
The MSP430F135 feet 58 of block 110 are connected with an input terminal of the 1st nor gate 532, the 2nd nor gate 533, the 1st nor gate 532
Another input terminal is connected with MAX9693 feet 2,532 output end of the 1st nor gate is connected with MAX9693 feet 4；MAX9693 feet 1,16
Two input terminals with door 534 are connect respectively, with the output termination Receive_Out ends of door 534, the input terminal of NOT gate 535, NOT gate
Another input terminal of 535 output the 2nd nor gate 533 of termination；The information flow of threshold value zero crossing detection function is as follows：
A channel
The MSP430F135 of data processing and control module 110 sets the A channel input signal of OUT2 end signals with reference to electricity
Flat VWith reference to, VWith reference to=threshold value；If the V of A channel input signal end INA+OUT2＞ VWith reference to, VQAOUT=5V, With MSP430F135'sLow level signal inputs the 1st nor gate 532, nor gate 532 exports high level signal,
So that MAX9693 is latched, enabled foot 4 is enabled, triggers latch signal VQAOUT；
Channel B
Channel B input signal end INB+ ground connection, V=VGNDIt is logical that=0, OUT2 signal input channel B datum end INB-, B
Road carries out opposite comparison with A channel；If the V of channel B datum end INB-OUT2＜ 0, VQBOUT=5V, So that MAX9693 is latched, enabled foot 13 is enabled, triggers latch signal VQBOUT；
If the output V of A channelQAOUTThe output V of ＞ 0, channel BQBOUT＞ 0, through exporting high level, characterization OUT2 with door 534
The zero of end signal.
As shown in figure 9, energy converter integral structure unit 600, which includes the 1st transmitting ＆, receives the dual-purpose hair of energy converter the 610, the 2nd
It penetrates ＆ and receives dual-purpose the 620, the 1st combustion gas bend pipe 630 of energy converter, the 2nd combustion gas bend pipe 640, n shapes test tube the 650, the 1st emits ＆ and receives two
With energy converter 610 by the 1st energy converter piezoceramic transducer 611, the 1st energy converter acoustic impedance matching layer 612 of LHQ200-3 types
Composition, the 2nd transmitting ＆ receive dual-purpose energy converter 620 and are changed by the 2nd energy converter piezoceramic transducer the 621, the 2nd of LHQ200-3 types
It can 622 composition of device acoustic impedance matching layer；The 1st dual-purpose transmitting of energy converter the 610, the 2nd ＆ of transmitting ＆ receptions receives dual-purpose energy converter 620 and divides
Not An Zhuan 650 horizontal segment of n shapes test tube left and right end；N shapes test tube 650 passes through the 1st combustion gas bend pipe 630, the 2nd combustion gas bend pipe 640
Access gas supply pipe；
1st energy converter acoustic impedance matching layer, 612 overall thickness be 1/4 λ of ultrasonic acoustic wave wavelength thin rounded flakes, overall thickness with
It is 0.425mm at 25 DEG C on the basis of 200KHz wave length of sound；1st energy converter acoustic impedance matching layer 612 is by the 1st energy converter epoxy
Resin colloid layer 613 and the 1st energy converter mica sheet 614 are constituted, and the 1st energy converter epoxy resin colloid layer 613 is by LHQ200-3 types
The 1st energy converter piezoceramic transducer 611 closely connect with the 1st energy converter mica sheet 614；1st transmitting ＆ receives dual-purpose transducing
Device 610 is mounted in the 1st energy converter casing 615, and the 1st energy converter casing 615 is solid by the four pieces of positioning of screw 616 of the 1st energy converter
Be scheduled on 650 inlet end of n shapes test tube, the 1st transducer seal washer 617 be placed in the 1st energy converter casing 615 and n shapes test tube 650 it
Between ensure air-tightness；2nd transmitting ＆ receives dual-purpose 620 mounting means of energy converter and the 1st transmitting ＆ receives dual-purpose 610 class of energy converter
Together.
Claims (7)
1. a kind of civilian ultrasonic wave gas meter, which is characterized in that civilian ultrasonic wave gas meter is by data processing and control communication unit
First (100), time measuring unit (200), ultrasonic wave emit/receive switch unit (300), ultrasonic exciting unit (400), surpass
Acoustic receiver unit (500), energy converter integral structure unit (600) composition；Data processing and control communication unit (100) with
Time measuring unit (200), ultrasonic wave emit/receive switch unit (300) and be connected, and ultrasonic wave emits/receive switch unit
(300) integrated with time measuring unit (200), ultrasonic exciting unit (400), ultrasonic wave receiving unit (500), energy converter
Structural unit (600) is connected.
The operation of data processing and control communication unit (100) control time measuring unit (200), read access time measuring unit
(200) export time difference measurements value, pass through data processing and control communication unit (100) data processing and control module life
At gas flow and gas quantity, the bluetooth communication through data processing and control communication unit (100) upload gas flow and
Gas quantity；Data processing and control communication unit (100) control ultrasonic wave and emit/receive switch unit (300) analog switch
It disconnects and is closed, the transmitting of time measuring unit (200)/receiving channel emits through ultrasonic wave/receives switch unit (300) respectively
Access ultrasonic exciting unit (400), ultrasonic wave receiving unit (500)；Ultrasonic exciting unit (400), ultrasonic wave receive single
First (500) emit/receive switch unit (300) through ultrasonic wave, are respectively connected to the 1st of energy converter integral structure unit (600)
Transmitting ＆ receives dual-purpose energy converter, the 2nd transmitting ＆ receives dual-purpose energy converter or the dual-purpose energy converter of the 2nd transmitting ＆ receptions, the 1st transmitting ＆
Receive dual-purpose energy converter.
2. a kind of civilian ultrasonic wave gas meter according to claim 1, which is characterized in that the data processing and control
Communication unit (100) includes using MSP430F135 chips as the data processing of core and control module (110), model BLE-
The bluetooth communication (120) of CC41-A, MSP430F135 feet 32,33 are connected with BLE-CC41-A feet 2,1 respectively；Data processing
The time difference measurements value exported with control module (110) scavenging period measuring unit (200), based on the time difference data after cleaning
The gas quantity for asking gas flow rate and gas flow, flow accumulation to obtain uploads gas flow through bluetooth communication (120)
And gas quantity.
3. a kind of civilian ultrasonic wave gas meter according to claim 1, which is characterized in that the time measuring unit
(200) using TDC_GP21 chips as core, TDC_GP21 feet 4,21,28 are grounded, and foot 14,29 meets Vcc, R230、C230、R240One
Hold the pin 17,18, R that is connected230The other end be connected with foot 20,19, C230The other end ground connection, R240The other end and foot 24,23
It is connected；TDC_GP21 feet 8,9,10,11,12 respectively with the MSP430F135 feet 27 of data processing and control module (110), 28,
31,29,30 are connected；R210、C210One end ultrasonic wave that is connected emit/receive the ADG1234 feet 3, R of switch unit (300)210
The other end be connected with the foot 5 of TDC_GP21, C210The other end be connected with foot 30；R220、C220One end be connected ultrasonic wave hair
Penetrate/receive the ADG1234 feet 8, R of switch unit (300)220The other end be connected with TDC_GP21 feet 6, C220The other end with
TDC_GP21 feet 27 are connected；Foot 5, the foot 30 of TDC_GP21 forms a ultrasonic wave channel, and foot 6, the foot 27 of TDC_GP21 form
Another ultrasonic wave channel；R240Model Pt1000 platinum resistance thermometer sensor,s, acquisition fuel gas temperature T.
4. a kind of civilian ultrasonic wave gas meter according to claim 1, which is characterized in that the ultrasonic wave emits/connects
Switch unit (300) is received using ADG1234 chips as core, ADG1234 is connected by foot 3,8 with time measuring unit (200)；
ADG1234 feet 1,10,11,20,15 respectively with the MSP430F135 feet 44 of data processing and control module (110), 45,46,47,
48 are connected, and ADG1234 feet 2 and 9, foot 13 are connected with the end Urge_In, Urge_Out of ultrasonic exciting unit (400) respectively,
ADG1234 feet 18, foot 4 and 7 are connected with the end Receive_In, Receive_Out of ultrasonic wave receiving unit (500) respectively,
ADG1234 feet 12 and 15, foot 14 and 17 receive dual-purpose transducing with the 1st transmitting ＆ of energy converter integral structure unit (600) respectively
Device, the 2nd transmitting ＆ receive dual-purpose energy converter and are connected；
Ultrasonic wave emits/receives switch unit (300) execution TDC_GP21 feet 5 and 30 ultrasonic wave channel of foot, foot 6 and foot 27 are another
The transmitting in ultrasonic wave channel/receiving channel switching executes the 1st transmitting ＆ of energy converter integral structure unit (600) and receives dual-purpose change
Energy device, the 2nd transmitting ＆ receive transmitting/reception energy converter switching of dual-purpose energy converter；Two groups of hairs in ultrasonic wave channel and energy converter
Switching is penetrated/receives, two groups of given values of corresponding four-way single pole double throw analog switch ADG1234 chip controls feet are given with two groups
The corresponding ADG1234 on off states of definite value see the table below：
When control terminal is given value 1,27 another ultrasonic wave channel of 30 ultrasonic wave channel of TDC_GP21 feet 5 and foot, foot 6 and foot,
1st transmitting ＆ receive dual-purpose energy converter, the 2nd transmitting ＆ receive dual-purpose energy converter information flow it is as follows：TDC_GP21 feet 5 export
200KHZ square-wave signals are to ADG1234 feet D1, D1 and S1A closure, through ultrasonic exciting unit (400) to ADG1234 feet D3, D3
It is closed with S3A, the 1st transmitting ＆ of signal driving of S3A outputs receives dual-purpose energy converter and emits ultrasonic wave；2nd transmitting ＆ receives dual-purpose
Energy converter receives the 1st transmitting ＆ and receives the ultrasonic signal of dual-purpose energy converter transmitting, exports to ADG1234 feet S4B, S4B and D4 and close
It closes, is closed through ultrasonic wave receiving unit (500) to S2B, S2B and D2, the signal that D2 is exported to TDC_GP21 feet 6；
When control terminal given value 2,27 another ultrasonic wave channel of 30 ultrasonic wave channel of TDC_GP21 feet 5 and foot, foot 6 and foot, the 1st
Transmitting ＆ receive dual-purpose energy converter, the 2nd transmitting ＆ receive dual-purpose energy converter information flow it is as follows：TDC_GP21 feet 5 export 200KHZ
Square-wave signal is to ADG1234 feet D2, D2 and S2A closure, through ultrasonic exciting unit (400) to ADG1234 feet D3, D3 and S3B
It is closed, the 2nd transmitting ＆ of signal driving of S3B outputs receives dual-purpose energy converter and emits ultrasonic wave；1st transmitting ＆ receives dual-purpose energy converter
It receives the 2nd transmitting ＆ and receives the ultrasonic signal of dual-purpose energy converter transmitting, output to ADG1234 feet S4A, S4A and D4 closure, warp
Ultrasonic wave receiving unit (500) is closed to S2A, S2A and D2, and the signal of D2 outputs is to TDC_GP21 feet 6.
5. a kind of civilian ultrasonic wave gas meter according to claim 1, which is characterized in that the ultrasonic exciting unit
(400) include IRL3410 insulated-gate types MOSFET (410), step-up transformer (420)；R410、C410、R420One end be connected
One end of step-up transformer (420) primary side, R410、C410The other end ground connection, R420Another termination Vcc；MOSFET's (410)
Source electrode ground connection, drain electrode are connected with the other end of step-up transformer (420) primary side, and grid is through R430Access the ends Urge_In；Boosting becomes
The both ends parallel connection R on depressor (420) pair side440, one end ground connection on secondary side, the ends other end access Urge_Out on secondary side；Time measures
The pulse train of 6 mouthfuls of generations of TDC_GP21 feet 5 or foot of unit (200) is inputted by the ends Urge_In, when input pulse high level
When, MOSFET (410) conductings, step-up transformer (420) pair side does not work, and when input pulse low level, MOSFET (410) is cut
Only, the secondary side conducting of step-up transformer (420), primary side energy is discharged into secondary side, driving transmitting ＆ receives dual-purpose energy converter transmitting ultrasound
Wave.
6. a kind of civilian ultrasonic wave gas meter according to claim 1, which is characterized in that the ultrasonic wave receiving unit
(500) include pre-amplifying module (510), second order bandpass filtering modules block (520), threshold value zero passage detection module (530)；Preceding storing
Big module (510) is using AD8221 programmable-gain amplifiers as core, D511、D512Parallel connected in reverse phase, one end in parallel with
The ends Receive_In, C511One end be connected, the other end in parallel and the ends-Receive_In, C512One end be connected, C511It is another
One end and R511One end be connected be followed by AD8221 feet 1, R511The other end ground connection, C512The other end and R512One end be connected after
Meet AD8221 feet 4, R512The other end ground connection；AD8221 feet 8,5,6,7 connect respectively Vcc ,-Vcc, the ends OUT1；Second order band logical
Filter module (520) is using OPA820 amplifiers as core, R521、R525、C521、C522One end be connected, R521Another termination OUT1
End, R522With C521、C522The other end be connected, C522The other end ground connection, C521Another termination OPA820 feet 3；R523、R524's
One end is connected, R523The other end ground connection, R524、R525The other end be connected OPA820 feet 6 and the ends OUT2.
Threshold value zero passage detection module (530) includes using the be core binary channels comparator (531) with latch function, the 1 MAX9693
Nor gate (532), the 2nd nor gate (533) and door (534), NOT gate (535), MAX9693 feet 7 and data processing and control module
(110) MSP430F135 feet 26 are connected, and 693 feet 8,10 of MAX9 are connected the ends OUT2, and foot 3,9,14 is grounded；Data processing and
The MSP430F135 feet 58 of control module (110) are connected with an input terminal of the 1st nor gate (532), the 2nd nor gate (533),
1st nor gate (532) another input terminal is connected with MAX9693 feet 2, the 1st nor gate (532) output end and 4 phase of MAX9693 feet
Even；MAX9693 feet 1,16 connect respectively with two input terminals of door (534), with the ends the output of door (534) termination Receive_Out,
The input terminal of NOT gate (535), the output of NOT gate (535) terminate another input terminal of the 2nd nor gate (533)；Threshold value zero passage is examined
The information flow of brake is as follows：
A channel
The MSP430F135 of data processing and control module (110) sets the A channel input signal datum of OUT2 end signals
VWith reference to, VWith reference to=threshold value；If the V of A channel input signal end INA+OUT2＞ VWith reference to, VQAOUT=5V,
With MSP430F135'sLow level signal inputs the 1st nor gate (532), nor gate (532) output high level signal, makes
MAX9693 latches enabled foot 4 and enables, triggers latch signal VQA OUT；
Channel B
Channel B input signal end INB+ ground connection, V=VGND=0, OUT2 signal input channel B datum end INB-, channel B with
A channel carries out opposite comparison；If the V of channel B datum end INB-OUT2＜ 0, VQBOUT=5V, Make
MAX9693 latches enabled foot 13 and enables, triggers latch signal VQBOUT；
If the output V of A channelQAOUTThe output V of ＞ 0, channel BQBOUT＞ 0, through exporting high level, the ends characterization OUT2 with door (534)
The zero of signal.
7. civilian ultrasonic wave gas meter according to claim 1, which is characterized in that the energy converter integral structure list
First (600) include that the 1st transmitting ＆ receives dual-purpose energy converter (610), the 2nd transmitting ＆ receives dual-purpose energy converter (620), and the 1st combustion gas is curved
(630), the 2nd combustion gas bend pipe (640), n shapes test tube (650) are managed, the 1st transmitting ＆ receives dual-purpose energy converter (610) by LHQ200-3 types
The 1st energy converter piezoceramic transducer (611), the 1st energy converter acoustic impedance matching layer (612) composition, the 2nd transmitting ＆ receive two
With energy converter (620) by the 2nd energy converter piezoceramic transducer (621), the 2nd energy converter acoustic impedance matching layer of LHQ200-3 types
(622) it forms；1st transmitting ＆ receives dual-purpose energy converter (610), the 2nd transmitting ＆ receives dual-purpose energy converter (620) and is separately mounted to n
The left and right end of shape test tube (650) horizontal segment；N shapes test tube (650) is connect by the 1st combustion gas bend pipe (630), the 2nd combustion gas bend pipe (640)
Enter gas supply pipe.
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