CN106643930A - Improved ultrasonic flowmeter - Google Patents
Improved ultrasonic flowmeter Download PDFInfo
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- CN106643930A CN106643930A CN201510486751.3A CN201510486751A CN106643930A CN 106643930 A CN106643930 A CN 106643930A CN 201510486751 A CN201510486751 A CN 201510486751A CN 106643930 A CN106643930 A CN 106643930A
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Abstract
The invention discloses an improved ultrasonic flowmeter which comprises three pairs of ultrasonic transceiving devices arranged around the circumference of a gas pipeline, a control unit used to process information collected by the ultrasonic transceiving devices, wherein an ultrasonic propagation path formed by one pair of the ultrasonic transceiving devices intersects the center line of the gas pipeline, and ultrasonic propagation paths formed by the other two pairs of ultrasonic transceiving devices are mutually parallel and are symmetrically distributed on two sides of the center line of the gas pipeline. The control unit comprises modules including a sampling module, a time module and a computation module, wherein the sampling module is used to select two sampling points in echo signals of ultrasonic waves; the time module is used to compute an intersection moment T3 of the connection line of the two sampling points and a standard level line; and the computation module is used to compute transmission time of the ultrasonic waves and compute a gas flow rate according to the transmission time. The ultrasonic flowmeter disclosed by the invention has the advantages that the gas flow rate can be measured accurately; states of a gas pipe network can be monitored in real time; and abnormities in transmission and distribution could be responded in time.
Description
Technical field
The present invention relates to measuring instrument technical field, and in particular to a kind of improved ultrasonic flowmeter.
Background technology
Due to attention rate more and more higher of the people to environment, green energy resource of the natural gas as clean environment firendly
More and more extensive concern is obtained and has applied, Gas Industry all will have been obtained within the following some time
It is fast-developing.In order to adapt to the growth requirement of Gas Industry, particularly gas company to natural gas meter
Amount and the growth requirement of pipe network transmission ＆ distribution management, under its development of informationization technology, metering is accurate,
Working stability, and the intelligent flow meter systems with remote management capability initially enter gas metering and
In transmission ＆ distribution management.
At present, domestic application is mainly Roots's table and whirlpool in the flowmeter that gas metering and transmission ＆ distribution are managed
Wheel table, both measuring instruments belong to mechanical measuring instrument, it is difficult to break away from mechanical instrument intrinsic
Weakness, for example it is, high to the quality requirement of natural gas, easily block, safeguard frequently and maintenance cost
It is higher, while with the increase in natural gas transportation line portals footpath, the volume of two kinds of mechanical measuring instruments,
Weight and price can significantly rise, and these weakness seriously constrain gas metering and pipe network transmission ＆ distribution pipe
Reason develops towards the direction of " accurate, stable, intelligent, efficient ".
In order to overcome the shortcoming of mechanical measuring instrument, ultrasonic flowmeter is occurred in that in prior art,
The detection of gas flow is carried out using ultrasonic signal, such as Authorization Notice No. is CN102914334B
Patent of invention document disclose a kind of plug-in type ultrasonic gas flowmeter, including when using insertion treat
The transducer fixed mount surveyed in gas piping, is installed with for measuring ultrasonic wave on transducer fixed mount
The ultrasonic wave of the adverse current time when following current time and adverse current under test gas during downstream propagation propagates
Transducer group is also including being arranged in when using under test gas pipeline with the ultrasonic transducer group phase
It is connected at corresponding pipeline section and with the pipeline section and for the quiet of the under test gas free diffusing in the pipeline section
Fast container, arranges the ultrasonic wave for measuring ultrasonic propagation velocity in quiet fast pipe on quiet fast container
Transducer.
But in the patent of invention document, quiet fast pipe needs to insert in gas piping carries out gas flow
Measurement, quiet fast pipe itself can cause disturbance to gas flowing, so as to cause the error of flow measurement.
In order to meet the growth requirement of gas metering and the management of pipe network transmission ＆ distribution, it is desirable to provide a kind of intelligence
The ultrasonic flowmeter of change, to realize the accurate measurement to gas discharge.
The content of the invention
The invention provides a kind of improved ultrasonic flowmeter, can accurately be surveyed to gas flow
Amount, to gas pipeline network state monitor in real time is carried out, and transmission ＆ distribution are timely responded to extremely, is especially suitable for
Manage in the transmission ＆ distribution of natural gas.
A kind of improved ultrasonic flowmeter, the ultrasonic flowmeter includes：
Around gas pipeline three pairs of ultrasonic receiving devices circumferentially, one pair of which ultrasonic transmission/reception dress
Put formed ultrasonic wave propagation path to intersect with the center line of gas pipeline, remaining two pairs of ultrasonic wave is received
The ultrasonic wave propagation path that transmitting apparatus are formed is parallel to each other, and is symmetrically distributed in gas pipeline center line
Both sides；
For processing the control unit that ultrasonic receiving device gathers information, the control unit includes following
Module：
Sampling module, for choosing two sampled points in the sampled data of the echo-signal of ultrasonic wave；
Time module, calculates the intersection point moment T of two sampled point lines and reference level line3；
Computing module, using formula t=T3-T0- nT calculates the transmission time of ultrasonic wave, and using transmission
Time Calculation obtains the corresponding initial gas flow of each echo-signal, and each initial gas flow is carried out
Weighted average, obtains gas weighted average flow velocity and is calculated gas flow, in formula, T accordingly0For
The moment that ultrasonic wave sends；T1For the initial time of echo-signal, n is T1With T3Between echo-signal
Number of cycles, T is the cycle of ultrasonic echo signal.
The ultrasonic wave that a pair of ultrasonic probes are formed is a branch of, with the beam ultrasonic wave in the present invention
Axis is used as corresponding ultrasonic wave propagation path.
In gas pipeline circumferentially three pairs of ultrasonic receiving devices, each ultrasonic transmission/reception in the present invention
Device all has the function of receiving and launch ultrasonic wave, and each ultrasonic receiving device stretches into gas in the present invention
Part in body pipeline is very little, will not form interference to the flow regime of gas.
In order to accurately measure the propagation time of ultrasonic wave, and take into account the efficiency of measurement, it is preferable that each pair
The ultrasonic wave propagation path that ultrasonic receiving device is formed is with the angle of the center line of gas pipeline
30～60 degree.Two ultrasonic wave propagation path coplines being parallel to each other, another propagation to ultrasonic wave
Path only has an intersection point with the plane.
Every time during measurement gas flow, ultrasound is launched in turn successively and received to three pairs of ultrasonic receiving devices
Ripple signal, each pair ultrasonic receiving device obtains corresponding one group of ultrasonic echo signal, every group of echo
Signal correspondence obtains the forward transmission time of a ultrasonic wave and gas symport, and a ultrasonic wave
With the reverse transmission time of gas reverse transfer.
The ultrasonic wave transmitting of ultrasonic receiving device is controlled by control unit and is received, ultrasonic transmission/reception
Device completes the selection of ultrasonic transmission/reception passage according to the instruction of control unit, and carries out ultrasonic wave
Transmitting and reception.The transmitting-receiving order of ultrasonic receiving device can be set by advance program,
Can also Jing subsequently artificially arrange.
Using ultrasonic flowmeter gas flow is measured it is critical that Accurate Determining ultrasonic wave
Transmission time in gas, the echo-signal received due to ultrasonic probe, ultrasonic receiver generally by it is weak to
By force, then progressively decay, therefore, determine that the moment for receiving ultrasonic wave becomes true in echo-signal
Determine the key of transmission time.The ultrasonic flowmeter that the present invention is provided, can accurately and reliably obtain
The transmission time of ultrasonic wave, so as to obtain accurate gas flow.
In echo-signal, due to the intersection point of the restriction of sample frequency, echo-signal and reference level line
Moment is difficult to accurately acquisition, the present invention using two sampled point lines and reference level line intersection point as
The intersection point moment of echo-signal and reference level line, method is simple, and ensure that necessary calculating essence
Degree.
Preferably, the selection range of two sampled points is：First positive amplitude is big after triggering ripple
In VHH-VbAnd negative sense amplitude is more than Vb-VLLWave band trailing edge；
In two sampled points, one of sample is in [VHL, VHH] in the range of, another sampling
Point is located at [VLL, VLH] in the range of；
VHL、VHH、VLL、VLHDetermine according to sample frequency, determine that principle is：Every time sampling is inevitable
There is sample in selected level range, and the sampled point fallen into selected level range
Number is few as much as possible.
On the premise of sample frequency determines, [VHL, VHH] and [VLL, VLH] scope as much as possible
It is little.If [VHL, VHH] or [VLL, VLH] in exist it is multiple meet require sampled points, selection most lean on
The sampled point of nearly scope median.
If preferably, can not find in the sampled data of echo-signal meet require sampled point,
Gain is automatically adjusted, to obtain desired sampled point is met.
In extreme circumstances, for example when ultrasonic probe is damaged, it is possible that adjust increase anyway
Yidu can not obtain the situation for meeting desired sampled point, after attempting through a period of time, if begun
Can not obtain eventually and meet desired sampled point, whether probe can be normally carried out to judge, if it is decided that
Probe is abnormal, then carry out abnormal log and store and report to the police.
Select [VHL, VHH] and [VLL, VLH] purpose be to make two sampled point lines and benchmark
The intersection point moment of level line can approach the intersection point moment of echo-signal and reference level line, can reach
To the purpose on the premise of, according to sample frequency V is determinedHL、VHH、VLL、VLH。
VHHAnd VLLSelection mode be：When gas flow reaches the ultrasonic flow rate measuring journey upper limit,
Certain allowance is deducted using the maximum amplitude of corresponding ultrasonic wave to obtain.
The ultrasonic flow that the present invention is provided is calculated as intelligent electronic device, and measuring accuracy is high (at least up to
With stem-winder identical precision), stabilization of equipment performance is good, maintenance cost is low, while being also integrated with failure
Self diagnosis and Various types of data transporting function so that gas company can carry out reality to natural gas tube net state
When monitoring, remote management is carried out to gas transmission and distribution, abnormality is timely responded to, can effectively carry
Information system management level of the high gas company to gas ductwork.
Description of the drawings
Fig. 1 a are the schematic diagram of ultrasonic receiving device arrangement in the ultrasonic flowmeter for realize the present invention；
Fig. 1 b are the A in Fig. 1 a to schematic diagram；
Fig. 1 c are the B in Fig. 1 b to schematic diagram；
Fig. 1 d are that ultrasonic wave propagation path is received through the ultrasonic wave of pipe centerline in ultrasonic flowmeter
The sectional view of transmitting apparatus；
Fig. 2 is the structural representation of improved ultrasonic flowmeter of the invention；
Fig. 3 is the workflow schematic diagram of improved ultrasonic flowmeter of the invention；
Fig. 4 is the schematic flow sheet of time measurement；
Fig. 5 is original echoed signals schematic diagram；
Fig. 6 is the B portions enlarged drawing in Fig. 5.
Specific embodiment
Below in conjunction with the accompanying drawings, improved ultrasonic flowmeter of the invention is described in detail.
As shown in Fig. 1 a, 1b, 1c, the ultrasonic flowmeter that the present invention is adopted includes that three pairs of ultrasonic waves are visited
Head (i.e. ultrasonic receiving device), respectively ultrasonic probe 11 and ultrasonic probe 12, ultrasonic wave
Probe 21 and ultrasonic probe 22, ultrasonic probe 31 and ultrasonic probe 32, wherein ultrasonic probe
11 and the ultrasonic wave propagation path of ultrasonic probe 12 intersect with the center line of gas pipeline, remaining two pairs
The ultrasonic wave propagation path that ultrasonic probe is formed is parallel to each other, and is symmetrically distributed in gas pipeline center
The center line of the both sides of line, the ultrasonic wave propagation path that each pair ultrasonic probe is formed and gas pipeline
Angle be 60 degree, the distance of ultrasonic probe 21 and ultrasonic probe 31 is less than under test gas flow
The diameter of pipeline, and can be selected according to needs.
In Fig. 1 a, ultrasonic probe 32 and ultrasonic probe 22 overlap, ultrasonic probe 31 and ultrasonic wave
Probe 21 overlaps, and ultrasonic probe 11 and ultrasonic probe 12 are omitted in Fig. 1 c.
Each ultrasonic receiving device includes bandpass filtering, programmable-gain and signal sampling three
Divide functional circuit, the adjustment of ultrasonic echo signal completed by the cyclic process of sampling-adjustment-sampling,
Obtain the ultrasonic echo that can be correctly validated.
Band-pass filtering function circuit is passed through by frequency-selecting function ensureing that ultrasonic echo signal is lossless
Meanwhile, the clutter in echo-signal can be filtered, to ensure that the programmable gain circuit of rear class is obtained in that
Purer ultrasonic echo signal.
Except ultrasonic receiving device, as shown in Fig. 2 ultrasonic flowmeter also includes：Control unit,
Power module, input module, data memory module, wireless communication module, display module, operating mode are adopted
Collection module, output module.
Power module is used to provide power supply output, power supply mould to each power unit of ultrasonic flowmeter
The input of block is the dc source of 4.5～16V wide-voltage ranges, using change-over circuit respectively to ultrasonic wave
The each power unit of flowmeter is powered.DC supply input can utilize external power supply, it is also possible to by ultrasound
Battery supply inside low.
The ultrasonic flowmeter that the present invention is provided includes both of which, during a kind of gas flow for measurement
Mode of operation, to stop low-power consumption mode during gasmetry, control unit controls ultrasonic wave to another kind
Flowmeter automatically switches between both of which, and automatic switching procedure can in advance pass through program setting,
Can also be manually entered using input module.
, in control unit, control unit is according to super for the controlled process that power module is powered to each power unit
The mode of operation of acoustic wave flow meter and the difference of low-power consumption mode, to power module control signal is sent,
Coordinate ultrasonic flowmeter effectively to run with minimum power consumption, that is, the power unit for needing work is powered,
Power unit without working is stopped power supply.
Control unit is the core of ultrasonic flowmeter data processing and each composition partial function control
Part, using single-chip microcomputer (STM32 microprocessors) and FPGA the function of control unit is completed jointly,
When ultrasonic flowmeter works, the ultrasonic signal transmitting-receiving of ultrasonic receiving device is controlled using FPGA
And Time Calculation is carried out, and FPGA was calculated after the time, the Time Transmission for obtaining to single-chip microcomputer,
Single-chip microcomputer completes the calculating of flow according to the time.
Single-chip microcomputer carries out the calculating of gas flow and volume is repaiied except the time being input into according to FPGA
Just, the information exchange control of storage management, data and remaining equipment of data is also carried out, control shows
The function of module shows, the switching of the instruction input of input module, pattern, the collection of floor data with
And signal output.
Connect by SPI between programmable-gain functional circuit and control unit in ultrasonic receiving device
Mouth is communicated, and according to the instruction of control unit line amplitude adjustment, sample circuit pair are entered to echo-signal
Ultrasonic echo signal is sampled, and the data after sampling are delivered into control unit by SPI interface,
Control unit judges whether to need to be adjusted ultrasonic echo signal according to the sampling of sample circuit.
Control unit is communicated by RS485 interfaces with host computer, is enabled an administrator to by upper
The parameters such as system time, pattern, running parameter, volume correction chart are issued to control unit by machine,
Querying command can also be passed through and obtain current temperature, pressure, flow, the ultrasound of system to control unit
The status informations such as wave sound speed, can realize system in work to issue the control commands such as sleeping/waking to system
(system dormancy correspondence low-power consumption mode, wakes up correspondence work for switching between operation mode and low-power consumption mode
Operation mode).
Data memory module includes ferroelectric memory and SPI flash storage two parts, with control unit
Communicated by SPI interface, for systematic parameter, various list items, system mode and stoichiometric number
According to storage.
Wireless communication module adopts GPRS module, is communicated with control unit by UART interface,
And realized in equipment and pressure management area by public cordless communication network under the control of the control unit
The information exchange of the heart, complete the upload of continuous data, and the control instruction at pressure management area center connects
Receive.
Input module realizes contactless keypress function using Hall element, for being input into various fingers
Order, for example, the sleeping/waking of system, the function such as menu control and information inquiry.
Display module adopts OLED module, is communicated with control unit by SPI interface, for showing
Show the metrical informations such as the current temperature of system, pressure, flow, ultrasonic velocity, wherein flow includes
The polytypes such as present flow rate, integrated flow, timing flow, operating mode flow, mark condition flow.
Output module is communicated by numeral I/O mouths and SPI interface with control unit, single in control
Under the control of unit, digital pulse signal and 4～20mA electric current ring signals are exported, wherein, digital arteries and veins
Signal is rushed with status signals such as low and high level output abnormality warnings, 4～20mA electric currents ring signal is by defeated
Output galvanic current characterizes specific system mode.
Working condition acquiring module includes temperature collect module and pressure acquisition module, wherein temperature collect module
Communicated with control unit by analog interface, control unit is looked into according to the temperature data that sampling is obtained
The temperature transition table looked in data memory module, can learn working site temperature to realize gas flow
Etc. the amendment of data.
Pressure acquisition module is communicated by analog interface with control unit, and control unit is according to sampling
Pressure conversion table in the pressure data searching data memory module for obtaining, can learn that working site is pressed
Power is realizing the amendment of the data such as gas flow.
The present invention is as follows using the principle of ultrasonic flow rate measurement amount gas flow：
Ultrasonic probe of the ultrasonic signal that the ultrasonic probe of air-flow upstream sends to airflow downstream
During received ultrasonic signal, because gas flowing is produced in the transmission direction of ultrasonic signal
Velocity component, can accelerate the transmission of ultrasonic signal；The ultrasound that the ultrasonic probe of airflow downstream sends
Ripple signal to air-flow upstream ultrasonic probe received ultrasonic signal during, due to gas flowing
Velocity component is produced in the transmission direction of ultrasonic signal, the transmission of ultrasonic signal can be slowed down, profit
Gas is calculated with the difference of ultrasonic signal transmission time in pleasant direction of flow and inverse gas flow
Body flow.
As shown in figure 1, L is the air line distance of upstream and downstream ultrasonic probe in figure, D is pipe diameter,
θ be ultrasonic transmission path with determine tube hub line angle, V for gas mean flow rate, t1It is super
Sound wave forward transmission time, t2For the reverse transmission time of ultrasonic wave, then have：
Can be obtained by formula (I) and formula (II)：
Due to flow=flow velocity * cross-sectional areas, the expression formula by flow relocity calculation flow is as follows：
Wherein, C represents the spread speed of ultrasonic wave；A represents the cross-sectional area for determining pipe.
It doesn't matter with ultrasonic propagation velocity can to see gas flow rate by formula (IV), therefore, can
To avoid because the difference of the factors such as temperature, pressure causes ultrasonic propagation velocity to change, and cause gas
There is deviation in flowmeter body amount.
When gas flows in the duct, due to the impact of the factors such as pipe friction, on cross-section of pipeline
Flow have differences, the gas flow for directly being obtained by formula (IV) is needed after amendment,
It is capable of the actual flow of truly reacting gas, in order to improve the precision of metering, the present invention adopts three pairs
Totally six ultrasonic receiving devices are sampled to multi-point flux, then by average weighted method meter
Calculation obtains gas flow, and gas flow is modified, with the gas flow of approaching to reality.
From calculating process, measure gas flow it is critical that the accurately transmission of measurement ultrasonic wave
Time, in order to ensure the accuracy of gas flow measurement, therefore, the control unit in the present invention includes
With lower module：
Sampling module, for choosing two sampled points in the sampled data of the echo-signal of ultrasonic wave；
The selection range of two sampled points is：First positive amplitude is more than V after triggering rippleHH-VbAnd
Negative sense amplitude is more than Vb-VLLWave band trailing edge；As shown in Figure 5, Figure 6；Vb in Fig. 5, Fig. 6
On the basis of level line, reference level line differs and is set to zero, for example with 1.645V level line as base
Quasi- level line.
Part A in Fig. 5 is first ripple in triggering ripple, i.e. echo-signal, as shown in Figure 5, Figure 6,
In the present embodiment, VHHSpan be second crest maximum amplitude 90%, VLLValue model
Enclose for 90%, S of the 3rd trough maximum amplitude1And S2Two respectively selected sampled points, S1With
S2Intersection point moment of line and reference level line be T3, during the intersection point of echo-signal and reference level line
Carve as T2, with T3As T2Substitution value carry out the determination of ultrasonic transmission time, n is 2.
In two sampled points, one of sample is in [VHL, VHH] in the range of, another sampling
Point is located at [VLL, VLH] in the range of；
VHL、VHH、VLL、VLHDetermine according to sample frequency, determine that principle is：Every time sampling is inevitable
There is sample in selected level range, and the sampled point fallen into selected level range
Number is few as much as possible.
On the premise of sample frequency determines, [VHL, VHH] and [VLL, VLH] scope as much as possible
It is little.If [VHL, VHH] or [VLL, VLH] in exist it is multiple meet require sampled points, select near
The sampled point of scope median.
Time module, calculates the intersection point moment T of two sampled point lines and reference level line3；
Computing module, using formula t=T3-T0- nT calculates the transmission time of ultrasonic wave, and using transmission
Time Calculation obtains the corresponding initial gas flow velocity of each echo-signal, and each initial gas flow velocity is carried out
Weighted average, obtains gas weighted average flow velocity and calculates gas flow, in formula, T accordingly0For ultrasound
The moment that ripple sends；T1For the initial time of echo-signal, n is T1With T3Between echo-signal cycle
Number, T is the cycle of ultrasonic echo signal.
When the transmission time of ultrasonic wave is calculated, it is necessary first to which the echo-signal of ultrasonic wave is adjusted
It is whole, make ultrasonic echo signal triggering ripple (as shown in part A in Fig. 5, ultrasonic echo signal
First ripple) amplitude more than sampling triggering level VTH, ultrasonic wave send a period of time after start sampling,
If sample circuit issue a signal to ultrasonic receiving device start send ultrasonic wave time span be normal
Amount, is designated as ts, ultrasonic receiving device receive echo-signal to sample circuit receive echo-signal when
Between length be constant, be designated as tr, then when transmission time is calculated, need to deduct the two times,
That is, t=T3-T0- nT-ts- tr。
If can not find in the sampled data of echo-signal meeting desired sampled point, increasing is automatically adjusted
Benefit, to obtain desired sampled point is met.When receive echo-signal through some cycles adjustment it
Afterwards, cannot still obtain triggering ripple, then corresponding ultrasonic receiving device exception be judged, by temporary close
(two relative ultrasonic receiving devices in position constitute a ultrasonic transmission/reception to the ultrasonic transmission/reception passage
Passage), if the passage is repeatedly judged as exception, the passage will be forever closed, if pathway closure,
Abnormal alarm is then carried out, so that administrative staff are processed, as a result of three pairs of totally six ultrasonic waves
R-T unit, except the closing with higher robustness, any one passage also will not be significantly affected
Measuring accuracy.
As shown in figure 3, the ultrasonic flowmeter that the present invention is provided is when using, first by control unit and
Power module coordinates the upper electricity of completion system and initializes, and the power up of system is：Power module is first
First the minimum system to ensure that control unit normal work carries out upper electricity, the minimum system of control unit
After system normal work, control unit control power module carries out upper electricity to remaining power unit.
System is completed after electricity, under the control of the control unit, each functional module of system is carried out automatically
Communication and state-detection, after the completion of detection, if system mode is normal, open corresponding timing routine
(time of timing routine is set for the purpose of effectively reducing system power dissipation, and the length of timing time is necessary
The time needed for complete measurement flow is completed once more than system) idle condition is entered, wait corresponding
Interrupt instruction, if system mode exception, under the control of the control unit, by output module export
Digital pulse signal and 4～20mA electric current ring signals, carry out abnormal alarm.
For the equipment of externally fed, system in an idle state, can enter resting state to reduce
System power dissipation, it is also possible to do not enter resting state to ensure the response speed of system；For battery is powered
Low power consuming devices, described idle condition is the low power consumpting state of dormancy, is ensureing measuring accuracy
In the case of reduce system power dissipation.
When needed, system manager can be by the host computer that is connected with control unit to control unit
Corresponding instruction is issued, to system time, mode of operation, running parameter, various amendment list items
Etc. being issued or changed；System manager can also obtain system by host computer using querying command
The status information such as temperature, pressure, flow, can also be carried out by sleeping/waking command control system
The switching of working condition.
When exhausting a time-count cycle of timing routine, system can produce corresponding Interruption to hold
Open a measurement flow and a metering cycle, in each measurement flow, control unit on the one hand according to
The calculating of transmission time is completed according to the echo-signal of ultrasonic receiving device, is on the other hand surveyed by temperature
Amount module and pressure measuring module carry out AD samplings, and inquire about in data memory module and change accordingly
List item to obtain the work informations such as working site temperature, pressure, then control unit according to obtain when
Between, the parameter such as temperature and pressure carry out data processing, to complete the metering and amendment of gas flow；
After obtaining effective continuous data, the storage of data is completed on request, terminate this measurement flow.
In each measurement flow, control unit controls ultrasonic receiving device according to required order
The transmitting and reception of ultrasonic wave are carried out, as shown in figure 4, first, control unit is according to a metering stream
Ultrasonic wave can be chosen in journey with the effective time data needed for most fast speed acquisition whole as principle
R-T unit carries out the transmitting of ultrasonic wave, and corresponding ultrasonic receiving device carries out connecing for echo-signal
Receive, after echo signal reception, sampling circuit samples are controlled by control unit, and in returning that sampling is obtained
Two sampled points are chosen according to rule in ripple signal, using two sampled point lines and reference level line
The intersection point moment calculates the transmission time of ultrasonic wave, and ultrasonic receiving device informs control by interrupt signal
Unit read access time data, obtain once effectively time data and record data in memory module
Afterwards, this precise time measurement procedure terminates.
Every time after the completion of measurement flow, control unit is according to system Current Temperatures, pressure, gas flow
And the metrical information such as ultrasonic velocity, judgement is that gas distributing system is no has abnormal conditions；If system
State is normal, then working-flow enters next stage；If there are abnormal conditions, abnormal mark is carried out
Will is stored, and can export digital pulse signal and 4-20mA electric current ring signals by output module, is entered
Row abnormal alarm；Wherein, digital pulse signal with low and high level transmission abnormality report to the police etc. status signal,
4-20mA electric currents ring signal characterizes specific system mode by output quantization electric current, for outside confession
The equipment of electricity, it is also possible to which long-range abnormal alarm is carried out by wireless communication module.
If system adopts externally fed, as needed, can be by wireless communication module and administrative center
Real-time wireless communication connection is set up, to complete the real-time upload of continuous data and system mode etc..
System can carry out system during operation by the cooperation of input module and display module
The function such as sleeping/waking, menu control, continuous data and state information searching.
When ultrasonic flowmeter does not carry out gasmetry, system enters idle condition.
Above-mentioned embodiment is not received for the present invention preferably embodiment, but embodiments of the present invention
The restriction of the embodiment, is made under other any Spirit Essences without departing from the present invention and principle
Modification, replacement, combination, cutting, should be equivalent substitute mode, be included in the present invention
Within protection domain.
Claims (7)
1. a kind of improved ultrasonic flowmeter, it is characterised in that the ultrasonic flowmeter includes：
Around gas pipeline three pairs of ultrasonic receiving devices circumferentially, one pair of which ultrasonic transmission/reception dress
Put formed ultrasonic wave propagation path to intersect with the center line of gas pipeline, remaining two pairs of ultrasonic wave is received
The ultrasonic wave propagation path that transmitting apparatus are formed is parallel to each other, and is symmetrically distributed in gas pipeline center line
Both sides；
For processing the control unit that ultrasonic receiving device gathers information, the control unit includes following
Module：
Sampling module, for choosing two sampled points in the sampled data of the echo-signal of ultrasonic wave；
Time module, calculates the intersection point moment T of two sampled point lines and reference level line3；
Computing module, using formula t=T3-T0- nT calculates the transmission time of ultrasonic wave, and using transmission
Time Calculation obtains the corresponding initial gas flow of each echo-signal, and each initial gas flow is carried out
Weighted average, obtains gas weighted average flow velocity and is calculated gas flow, in formula, T accordingly0For
The moment that ultrasonic wave sends；T1For the initial time of echo-signal, n is T1With T3Between echo-signal
Number of cycles, T is the cycle of ultrasonic echo signal.
2. improved ultrasonic flowmeter as claimed in claim 1, it is characterised in that each pair ultrasound
The ultrasonic wave propagation path that ripple R-T unit is formed is 30～60 with the angle of the center line of gas pipeline
Degree.
3. improved ultrasonic flowmeter as claimed in claim 2, it is characterised in that be parallel to each other
Two ultrasonic wave propagation path coplines, another propagation path to ultrasonic wave and the plane only have one
Individual intersection point.
4. improved ultrasonic flowmeter as claimed in claim 3, it is characterised in that two samplings
Point selection range be：First positive amplitude is more than V after triggering rippleHH-VbAnd negative sense amplitude is more than
Vb-VLLWave band trailing edge；
In two sampled points, one of sample is in [VHL, VHH] in the range of, another sampling
Point is located at [VLL, VLH] in the range of；
VHL、VHH、VLL、VLHDetermine according to sample frequency, determine that principle is：Every time sampling is inevitable
There is sample in selected level range, and the sampled point fallen into selected level range
Number is few as much as possible.
5. improved ultrasonic flowmeter as claimed in claim 4, it is characterised in that in sampling frequency
On the premise of rate determines, [VHL, VHH] and [VLL, VLH] scope it is little as much as possible.
6. improved ultrasonic flowmeter as claimed in claim 5, it is characterised in that if [VHL,
VHH] or [VLL, VLH] in exist it is multiple meet require sampled points, select near scope median
Sampled point.
7. improved ultrasonic flowmeter as claimed in claim 6, it is characterised in that if returning
Can not find in the sampled data of ripple signal and meet desired sampled point, then automatically adjust gain, to obtain
Meet desired sampled point.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112414483A (en) * | 2020-11-10 | 2021-02-26 | 宁波智复物联科技有限公司 | Self-adaptive method for acquiring metering signals of ultrasonic water meter |
| CN112530429A (en) * | 2020-11-30 | 2021-03-19 | 昌飞 | Ultrasonic flowmeter with AI voice recognition system |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003139592A (en) * | 2001-10-31 | 2003-05-14 | Tokyo Keiso Co Ltd | Ultrasonic flowmeter by propagation time difference method |
| CN201837420U (en) * | 2010-04-30 | 2011-05-18 | 重庆理工大学 | Device for precisely measuring ultrasonic wave transmission time |
| CN102297712A (en) * | 2011-07-12 | 2011-12-28 | 北京理工大学 | Method for measuring propagation time of ultrasonic echo |
| CN103344288A (en) * | 2013-06-25 | 2013-10-09 | 国家电网公司 | Time difference type ultrasonic flowmeter measuring method based on zero point analysis |
| CN103630174A (en) * | 2013-12-07 | 2014-03-12 | 重庆前卫科技集团有限公司 | Flow measuring method of ultrasonic flow meter |
| CN103868555A (en) * | 2012-12-11 | 2014-06-18 | 南京理工大学 | Circulatory time difference detection method for ultrasonic flow meter |
| CN104198758A (en) * | 2014-09-22 | 2014-12-10 | 北京昌民技术有限公司 | Ultrasonic receiving timing setting method |
| CN104316120A (en) * | 2014-10-28 | 2015-01-28 | 姜跃炜 | Flow detection method and system for high-precision ultrasonic flow meter |
-
2015
- 2015-08-10 CN CN201510486751.3A patent/CN106643930B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003139592A (en) * | 2001-10-31 | 2003-05-14 | Tokyo Keiso Co Ltd | Ultrasonic flowmeter by propagation time difference method |
| CN201837420U (en) * | 2010-04-30 | 2011-05-18 | 重庆理工大学 | Device for precisely measuring ultrasonic wave transmission time |
| CN102297712A (en) * | 2011-07-12 | 2011-12-28 | 北京理工大学 | Method for measuring propagation time of ultrasonic echo |
| CN103868555A (en) * | 2012-12-11 | 2014-06-18 | 南京理工大学 | Circulatory time difference detection method for ultrasonic flow meter |
| CN103344288A (en) * | 2013-06-25 | 2013-10-09 | 国家电网公司 | Time difference type ultrasonic flowmeter measuring method based on zero point analysis |
| CN103630174A (en) * | 2013-12-07 | 2014-03-12 | 重庆前卫科技集团有限公司 | Flow measuring method of ultrasonic flow meter |
| CN104198758A (en) * | 2014-09-22 | 2014-12-10 | 北京昌民技术有限公司 | Ultrasonic receiving timing setting method |
| CN104316120A (en) * | 2014-10-28 | 2015-01-28 | 姜跃炜 | Flow detection method and system for high-precision ultrasonic flow meter |
Non-Patent Citations (1)
| Title |
|---|
| 周围: "多声道超声流量计在单弯管流场中的误差研究", 《科学技术与工程》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112414483A (en) * | 2020-11-10 | 2021-02-26 | 宁波智复物联科技有限公司 | Self-adaptive method for acquiring metering signals of ultrasonic water meter |
| CN112530429A (en) * | 2020-11-30 | 2021-03-19 | 昌飞 | Ultrasonic flowmeter with AI voice recognition system |
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