CN108051036A - The ultrasonic flowmeter of non-full pipe and measuring ultrasonic wave flow system - Google Patents
The ultrasonic flowmeter of non-full pipe and measuring ultrasonic wave flow system Download PDFInfo
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- CN108051036A CN108051036A CN201711396360.8A CN201711396360A CN108051036A CN 108051036 A CN108051036 A CN 108051036A CN 201711396360 A CN201711396360 A CN 201711396360A CN 108051036 A CN108051036 A CN 108051036A
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- ultrasonic
- ultrasonic sensor
- full pipe
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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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- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a kind of ultrasonic flowmeters of non-full pipe, including the first ultrasonic sensor and the second ultrasonic sensor being arranged in the horizontal direction through piping geometric center, the 3rd ultrasonic sensor and the central processing unit being arranged on the vertical direction through piping geometric center.First ultrasonic wave and the second ultrasonic wave are mutually sent and received by the first ultrasonic sensor and the second ultrasonic sensor, 3rd ultrasonic sensor sends and receives the 3rd ultrasonic wave reflected from liquid level to liquid level, flow rate of liquid is calculated according to the transmission time of the first ultrasonic wave and the second ultrasonic wave in central processing unit, liquid height is calculated according to the transmission time of the 3rd ultrasonic wave, fluid flow information is finally calculated according to flow rate of liquid and liquid height, realizes the purpose for measuring non-full tube liquid runoff.The present invention also provides a kind of measuring ultrasonic wave flow system of non-full pipe, effect is corresponding with the effect of the ultrasonic flowmeter of above-mentioned non-full pipe.
Description
Technical field
The present invention relates to pipeline flow fields of measurement, more particularly to the ultrasonic flowmeter and ultrasonic wave of a kind of non-full pipe
Flow Measuring System.
Background technology
With industrial expansion, in some occasions, such as wastewater treatment, municipal drainage, agricultural irrigation etc. are frequently necessary to use
To flow measurement.Wherein, it is just to start application as integrated circuit technique rapidly develops in recent ten years to play acoustic wave flow meter
A kind of instrument for being used for measuring pipeline flow, suitable for measuring the fluid and large-caliber flow that are not easy to contact and observe.It is general
Using time difference type measuring principle：After first probe transmitting signal passes through fluid, received by second probe, meanwhile, second
It is a probe transmitting signal received by first probe, due to being influenced be subject to fluid flow rate, the two existence time is poor, according to when
Between difference can calculate and draw flow velocity, and then can flow be obtained according to flow velocity.
But in some practical application scenes, the fluid in pipeline is often without full of pipeline, that is to say, that is non-full
The state of pipe.Since non-full pipe flow flow regime and full packages fluid flow state are entirely different, along with fluid level changes
Influence, the complexity of non-full pipe flow flowing will be greater than the complexity of full packages fluid, and therefore, the flow measurement of non-full pipe has
Certain difficulty.
To sum up, the flow measurement of non-full pipe has research significance very much.
The content of the invention
The object of the present invention is to provide a kind of ultrasonic flowmeter of non-full pipe and measuring ultrasonic wave flow system, to solve
Certainly conventional ultrasound wave flowmeter can not measure the problem of non-full pipe flow.
In order to solve the above technical problems, the present invention provides a kind of ultrasonic flowmeter of non-full pipe, including be arranged at by
The first ultrasonic sensor and the second ultrasonic sensor in the horizontal direction of pipeline geometric center, are arranged at by the pipe
The 3rd ultrasonic sensor on the vertical direction of road geometric center and with first sonac, described the second surpass
The central processing unit that sonic sensor is connected with the 3rd ultrasonic sensor；
Wherein, first ultrasonic sensor is used to send the first ultrasonic wave to second ultrasonic sensor, and
Receive the second ultrasonic wave that second ultrasonic sensor is sent；
Second ultrasonic sensor is used to send second ultrasonic wave to first ultrasonic sensor, and connects
Receive first ultrasonic wave that first ultrasonic sensor is sent；
Liquid levels of 3rd ultrasonic sensor for the inside of the pipeline send the 3rd ultrasonic wave, and receive
The 3rd ultrasonic wave reflected from the liquid levels；
The central processing unit is used for according to first ultrasonic wave from the first time period that is issued to reception and described the
The flow rate of liquid inside the pipeline, the central processing unit are calculated from the second time period for being issued to reception for two ultrasonic waves
It is high to be additionally operable to the liquid being calculated according to the 3rd ultrasonic wave from the 3rd period for being issued to reception inside the pipeline
Degree, and fluid flow information is calculated according to the flow rate of liquid and the liquid height.
Preferably, first ultrasonic sensor and second ultrasonic sensor are respectively arranged at the pipeline phase
Corresponding both sides.
Preferably, the 3rd ultrasonic sensor is arranged on the surface of the pipeline.
Preferably, first ultrasonic sensor, second ultrasonic sensor and the 3rd supersonic sensing
Device is separately positioned on the first probe, the second probe and the 3rd probe, first probe, second probe and the described 3rd
Probe runs through the tube wall of the pipeline.
Preferably, first probe and described second pops one's head in and is connected respectively with the first ultrasonic transducer, and described the
Three probes are connected with the second ultrasonic transducer, and first ultrasonic transducer and second ultrasonic transducer are used
In converting electrical energy into ultrasonic wave, the ultrasonic wave of first ultrasonic transducer and second ultrasonic transducer exports frequency
Rate is different.
Preferably, the ultrasonic flowmeter of the non-full pipe is provided with display screen, the display screen and the central processing
To connection, the display screen is used to show the fluid flow information device.
Preferably, function button is provided with around the display screen, the function button is used for the pressing in response to user
Realize the parameter setting to the ultrasonic flowmeter of the non-full pipe.
Preferably, the ultrasonic flowmeter of the non-full pipe is provided with timer, and the timer is used for when default
Between section send computations to the central processing unit, the central processing unit calculates the liquid in response to the computations
Flow information.
Preferably, the ultrasonic flowmeter of the non-full pipe is provided with memory, and the memory is for preservation every institute
State the fluid flow information of preset time period.
It is super including non-full pipe as described above the present invention also provides a kind of measuring ultrasonic wave flow system of non-full pipe
Acoustic wave flow meter.
The ultrasonic flowmeter of non-full pipe provided by the present invention, including being arranged at the level side through piping geometric center
Upward the first ultrasonic sensor and the second ultrasonic sensor, is arranged at the vertical direction by the pipeline geometric center
On the 3rd ultrasonic sensor and with first sonac, the second ultrasonic sensor and the 3rd ultrasonic wave pass
The central processing unit that sensor is connected.As it can be seen that the ultrasonic flowmeter of non-full pipe provided by the invention is passed by the first ultrasonic wave
Sensor and the second ultrasonic sensor mutually send the first ultrasonic wave and the second ultrasonic wave, and the 3rd ultrasonic sensor is sent out to liquid level
It send and receives the 3rd ultrasonic wave reflected from liquid level, central processing unit is according to the transmission of the first ultrasonic wave and the second ultrasonic wave
The flow velocity of pipeline internal liquid is calculated in time, i.e. first time period and second time period, according to the transmission of the 3rd ultrasonic wave
Time, i.e. the 3rd period are calculated pipeline internal liquid height, are finally calculated according to flow rate of liquid and liquid height
Fluid flow information finally realizes the purpose for measuring non-full tube liquid runoff.
The present invention also provides a kind of measuring ultrasonic wave flow system of non-full pipe, effect and the ultrasound of above-mentioned non-full pipe
The effect of wave flowmeter is corresponding, and which is not described herein again.
Description of the drawings
It, below will be to embodiment or existing for the clearer technical solution for illustrating the embodiment of the present invention or the prior art
Attached drawing is briefly described needed in technology description, it should be apparent that, the accompanying drawings in the following description is only this hair
Some bright embodiments, for those of ordinary skill in the art, without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structure diagram of the ultrasonic flowmeter embodiment one of non-full pipe provided by the invention；
Fig. 2-1 is a kind of pipeline for being mounted with the first ultrasonic sensor and the second ultrasonic sensor provided by the invention
Top view；
Fig. 2-2 is the pipe that another kind provided by the invention is mounted with the first ultrasonic sensor and the second ultrasonic sensor
Road top view；
Fig. 3 is two structure diagram of ultrasonic flowmeter embodiment of non-full pipe provided by the invention.
Specific embodiment
The core of the present invention is to provide a kind of ultrasonic flowmeter of non-full pipe and measuring ultrasonic wave flow system, realizes
Measure the purpose of non-full pipe flow.
In order to which those skilled in the art is made to more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.Obviously, described embodiment be only part of the embodiment of the present invention rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower all other embodiments obtained, belong to the scope of protection of the invention.
Start to be discussed in detail the ultrasonic flowmeter of non-full pipe provided by the invention below, referring to Fig. 1, Fig. 1 is the present invention
The structure diagram of the ultrasonic flowmeter embodiment one of the non-full pipe of offer, the ultrasonic flowmeter specifically include：It is arranged at
The first ultrasonic sensor 100 and the second ultrasonic sensor 200 in horizontal direction through piping geometric center, are arranged at
The 3rd ultrasonic sensor 300 on vertical direction by the pipeline geometric center and with first ultrasonic sensing
The central processing unit 400 that device, second ultrasonic sensor are connected with the 3rd ultrasonic sensor.
Ultrasonic flowmeter is a kind of contactless instrument, it can both measure the rate-of flow of Large Diameter Pipeline, can also use
In the measurement for the medium that is not easy to contact and observe.Its accuracy of measurement is very high, hardly by the various parameters of measured medium
Interference, it is particularly possible to solve other instrument cannot severe corrosive, the flow of non-conductive, radioactivity and inflammable and explosive medium surveys
Amount problem.The ultrasonic flowmeter of non-full pipe provided by the invention is set there are three ultrasonic sensor, and ultrasonic sensor is
It is a kind of both to emit ultrasonic wave, the sensor of ultrasonic wave can also be received.
Wherein, the first ultrasonic sensor 100 is used to send the first ultrasonic wave to the second ultrasonic sensor, and receives institute
State the second ultrasonic wave that the second ultrasonic sensor 200 is sent；Second ultrasonic sensor is used for the described first ultrasound
Wave sensor sends second ultrasonic wave, and receives first ultrasonic wave that first ultrasonic sensor is sent；The
Three ultrasonic sensors 300 send the 3rd ultrasonic wave for the liquid levels to the inside of the pipeline, and receive from the liquid
The 3rd ultrasonic wave that liquid level reflects.It should be noted that here the present invention mentioned by the first ultrasonic sensor,
Second ultrasonic sensor and the 3rd ultrasonic sensor are a kind of naming method.
While emitting and receiving ultrasonic wave, on the one hand, central processing unit 400 can calculate first ultrasonic wave from hair
Go out to the first time period of reception and second ultrasonic wave from the second time period for being issued to reception, then according to described
The flow rate of liquid inside the pipeline is calculated in one period and the second time period.
Specifically, assuming that the first ultrasonic sensor is located at ducts upstream, the second ultrasonic sensor is located at pipe downstream,
Its principle is mainly the first ultrasonic wave that the first ultrasonic sensor is sent to the second ultrasonic sensor, in transmission process
The speed of liquid itself in pipeline can be superimposed；Opposite, the second ultrasound that the second ultrasonic sensor is sent to first sensor
Ripple can reduce the speed of liquid itself in pipeline from transmission process.And the distance d of the two transmission is also equal, ultrasonic wave
Speed is light velocity c, and central processing unit measures the time period t 1 and t2 of the first ultrasonic wave and the second ultrasonic transmission, it is assumed that in pipeline
Flow rate of liquid is v, then has d=(c+v) * t1=(c-v) * t2, flow rate of liquid v can be acquired according to above formula.
On the other hand, the central processing unit was additionally operable to according to the 3rd ultrasonic wave from the 3rd time for being issued to reception
The liquid height inside the pipeline is calculated in section.
Specifically, assuming that the 3rd ultrasonic sensor is arranged at directly over pipeline, pipe diameter R, the 3rd ultrasonic wave passes
The defeated period is t3, and liquid height is h in pipeline, then has D-h=c*t3/2, liquid height can be calculated according to above formula
Degree.
Left back, the central processing unit is additionally operable to that liquid flow is calculated according to the flow rate of liquid and the liquid height
Measure information.
Specifically, it is understood that fluid flow, which is equal to f liquid cross section product, is multiplied by flow rate of liquid, then first according to front
F liquid cross section product s can be acquired by acquiring liquid height h and geometric knowledge, finally with reference to flow rate of liquid v, you can acquire flow
Its formula transfer process is not detailed herein in information q=s*v.
On the installation site of ultrasonic sensor, referring to Fig. 2-1 and Fig. 2-2, Fig. 2-1 and Fig. 2-2 are two kinds of installations the
The top view of the pipeline of one ultrasonic sensor and the second ultrasonic sensor.As shown in Fig. 2-1, the first ultrasonic sensor and
Second ultrasonic sensor can be arranged at both sides opposite on the horizontal plane through piping cluster center, in this case, surpass
Sonic transmissions direction as shown in the figure, shape similar to a zed, therefore this mounting means is referred to as Z-type installation.Such as Fig. 2-2
Shown, the first ultrasonic sensor and the second ultrasonic sensor can be arranged on the horizontal plane through piping geometric center
The same side, in this case, the transmission direction of ultrasonic wave is as shown in Fig. 2-2, and shape is similar to a letter V, therefore this installation
Mode is referred to as V-type installation.
On the installation site of the 3rd ultrasonic sensor, the vertical side through piping geometric center is mounted on as described above
Upwards, the surface of pipeline is specifically may be mounted at, the underface of pipeline can also be mounted on.It should be noted that this hair
The bright specific installation site to each ultrasonic sensor does not limit.In addition, the mounting means on sensor, common,
There are the mounting means such as plug-in type, external clamping and pipeline section type, the present invention does not also limit this.
Plug-in installation may be employed in the present embodiment, specifically, can be by first ultrasonic sensor, institute
It states the second ultrasonic sensor and the 3rd ultrasonic sensor is separately positioned on the first probe, the second probe and the 3rd probe
On, then the described first probe, second probe and the described 3rd are popped one's head in through the pipe of the pipeline in installation process
Wall.
Ultrasonic transducer is a kind of equipment for converting electrical energy into ultrasonic wave energy, and in the present embodiment, each ultrasonic wave passes
Sensor is connected with ultrasonic transducer.In order to ensure the accuracy of measurement, as shown in figure 3, provided by the invention non-full
In the ultrasonic flowmeter embodiment two of pipe, for measure flow rate of liquid it is described first probe and it is described second pop one's head in respectively with
First ultrasonic transducer 510 is connected, for measuring the 3rd probe of liquid height and the second ultrasonic transducer 520
It is connected.It is worth noting that, the ultrasonic wave output frequency of first ultrasonic transducer and second ultrasonic transducer
Rate is different.Preferably, the ultrasonic output frequency of the first ultrasonic transducer could be provided as 1MHz, and the second ultrasonic wave transducer
The ultrasonic output frequency of device could be provided as 40kHz.
In addition, referring to Fig. 3, the ultrasonic flowmeter of the non-full pipe can be provided with display screen 600, the display screen with
The central processing unit is to connection.The display screen is for showing the fluid flow information, in addition to this it is possible to show liquid
The information such as body flow velocity, liquid height, time of measuring.Touch display screen can even be selected or function as shown in Figure 3 is set
Button 700, survey crew can by pressing function button or point touching screen, to the ultrasonic flowmeter of non-full pipe into
Row parameter setting.
In view of practical application scene, and be not required 24 it is small when continual measurement pipeline flow information, referring to Fig. 3,
Can be that the ultrasonic flowmeter of the non-full pipe sets timer 800, the timer is used for every preset time period to institute
It states central processing unit and sends computations, the central processing unit calculates the fluid flow in response to the computations to be believed
Breath.By this mode, you can realize and measure a flow information every preset time, simplify flow survey to a certain extent
The process of amount.
Finally, referring to Fig. 3, it can be that the ultrasonic flowmeter of the non-full pipe sets memory 900, utilize the storage
Flow information when device will be each in segment pipe preserves, and is referred in order to which the later stage inquires about.
The ultrasonic flowmeter embodiment one and embodiment two of non-full pipe provided by the invention are described above, it is comprehensive
Upper to understand, the ultrasonic flowmeter of non-full pipe provided by the invention passes through the first ultrasonic sensor and the second ultrasonic sensor
The first ultrasonic wave and the second ultrasonic wave are mutually sent, the 3rd ultrasonic sensor, which is sent and received to liquid level from liquid level, to be reflected
The 3rd ultrasonic wave, while central processing unit is according to the transmission time of the first ultrasonic wave and the second ultrasonic wave, i.e. first time period
And second time period, the flow velocity of pipeline internal liquid is calculated, according to the transmission time of the 3rd ultrasonic wave, i.e. the 3rd time
Section, is calculated pipeline internal liquid height, fluid flow information finally is calculated according to flow rate of liquid and liquid height, most
The purpose for measuring non-full tube liquid runoff is realized eventually.
The present invention also provides a kind of measuring ultrasonic wave flow system of non-full pipe, which uses
The ultrasonic flowmeter of non-full pipe as described above.Wherein, the introduction on the ultrasonic flowmeter of non-full pipe may refer to
The ultrasonic flowmeter embodiment one of above-mentioned non-full pipe and the associated description of embodiment two, herein not reinflated introduction.
Since the measuring ultrasonic wave flow system of non-full pipe provided by the invention employs the super of non-full pipe as described above
Acoustic wave flow meter, therefore its effect is corresponding with the effect of the ultrasonic flowmeter of above-mentioned non-full pipe, which is not described herein again.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with it is other
The difference of embodiment, just to refer each other for same or similar part between each embodiment.For dress disclosed in embodiment
For putting, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related part is referring to method part
Explanation.
The ultrasonic flowmeter to non-full pipe provided by the present invention and measuring ultrasonic wave flow system have carried out in detail above
It is thin to introduce.Specific case used herein is set forth the principle of the present invention and embodiment, and above example is said
It is bright to be only intended to help the method and its core concept for understanding the present invention.It should be pointed out that the ordinary skill for the art
For personnel, without departing from the principle of the present invention, can also to the present invention some improvement and modification can also be carried out, these improvement
It is also fallen into modification in the protection domain of the claims in the present invention.
Claims (10)
1. a kind of ultrasonic flowmeter of non-full pipe, which is characterized in that including being arranged at the level side through piping geometric center
Upward the first ultrasonic sensor and the second ultrasonic sensor, is arranged at the vertical direction by the pipeline geometric center
On the 3rd ultrasonic sensor and with first sonac, second ultrasonic sensor and the described 3rd
The central processing unit that ultrasonic sensor is connected；
Wherein, first ultrasonic sensor is used to send the first ultrasonic wave to second ultrasonic sensor, and receives
The second ultrasonic wave that second ultrasonic sensor is sent；
Second ultrasonic sensor is used to send second ultrasonic wave to first ultrasonic sensor, and receives institute
State first ultrasonic wave that the first ultrasonic sensor is sent；
3rd ultrasonic sensor sends the 3rd ultrasonic wave for the liquid levels to the inside of the pipeline, and receives from institute
State the 3rd ultrasonic wave that liquid levels reflect；
The central processing unit is used for according to first ultrasonic wave from the first time period that is issued to reception and described the second surpasses
The flow rate of liquid inside the pipeline is calculated from the second time period for being issued to reception for sound wave, and the central processing unit is also used
In liquid height inside the pipeline is calculated from the 3rd period for being issued to reception according to the 3rd ultrasonic wave, and
Fluid flow information is calculated according to the flow rate of liquid and the liquid height.
2. the ultrasonic flowmeter of non-full pipe as described in claim 1, which is characterized in that first ultrasonic sensor and
Second ultrasonic sensor is respectively arranged at the corresponding both sides of the pipeline.
3. the ultrasonic flowmeter of non-full pipe as claimed in claim 2, which is characterized in that the 3rd ultrasonic sensor is set
It puts in the surface of the pipeline.
4. the ultrasonic sensor of non-full pipe as claimed in claim 3, which is characterized in that first ultrasonic sensor,
Second ultrasonic sensor and the 3rd ultrasonic sensor are separately positioned on the first probe, the second probe and the 3rd is visited
On head, first probe, second probe and the 3rd probe run through the tube wall of the pipeline.
5. the ultrasonic flowmeter of non-full pipe as claimed in claim 4, which is characterized in that first probe and described second
Probe is connected respectively with the first ultrasonic transducer, and the 3rd probe is connected with the second ultrasonic transducer, and described the
One ultrasonic transducer and second ultrasonic transducer are used to convert electrical energy into ultrasonic wave, first ultrasonic waves
Energy device is different from the ultrasonic output frequency of second ultrasonic transducer.
6. the ultrasonic flowmeter of non-full pipe as claimed in claim 5, which is characterized in that the ultrasonic flow of the non-full pipe
Meter is provided with display screen, and with the central processing unit to being connected, the display screen is used to show the liquid flow display screen
Measure information.
7. the ultrasonic flowmeter of non-full pipe as claimed in claim 6, which is characterized in that set around the display screen active
Energy button, the function button are used to realize in response to the pressing of user and the parameter of the ultrasonic flowmeter of the non-full pipe are set
It puts.
8. the ultrasonic flowmeter of the non-full pipe as described in claim 1-7 any one, which is characterized in that the non-full pipe
Ultrasonic flowmeter is provided with timer, and the timer is used to send to the central processing unit every preset time period and calculate
Instruction, the central processing unit calculate the fluid flow information in response to the computations.
9. the ultrasonic flowmeter of non-full pipe as claimed in claim 8, which is characterized in that the ultrasonic flow of the non-full pipe
Meter is provided with memory, and the memory is used to preserve the fluid flow information every the preset time period.
10. the measuring ultrasonic wave flow system of a kind of non-full pipe, which is characterized in that including such as claim 1-9 any one institute
The ultrasonic flowmeter for the non-full pipe stated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711396360.8A CN108051036A (en) | 2017-12-21 | 2017-12-21 | The ultrasonic flowmeter of non-full pipe and measuring ultrasonic wave flow system |
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| CN201711396360.8A CN108051036A (en) | 2017-12-21 | 2017-12-21 | The ultrasonic flowmeter of non-full pipe and measuring ultrasonic wave flow system |
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| CN201711396360.8A Pending CN108051036A (en) | 2017-12-21 | 2017-12-21 | The ultrasonic flowmeter of non-full pipe and measuring ultrasonic wave flow system |
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| CN109141554A (en) * | 2018-05-25 | 2019-01-04 | 南京维朴水务工程有限公司 | A kind of area velocity flowmeter for surveying partly-filled pipe-flow using supersonic Doppler method |
| CN110057414A (en) * | 2019-04-09 | 2019-07-26 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | A kind of small diameter tube closed conduct water flow ultrasonic measurement optimization method and device |
| CN113074787A (en) * | 2021-03-23 | 2021-07-06 | 中国石油天然气集团有限公司 | Method for determining outlet flow of non-full pipe diversion trench |
| CN116839689A (en) * | 2023-07-05 | 2023-10-03 | 深圳鼎智达表计信息科技有限公司 | Ultrasonic water meter and networking and measuring method thereof |
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Cited By (5)
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| CN109141554A (en) * | 2018-05-25 | 2019-01-04 | 南京维朴水务工程有限公司 | A kind of area velocity flowmeter for surveying partly-filled pipe-flow using supersonic Doppler method |
| CN110057414A (en) * | 2019-04-09 | 2019-07-26 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | A kind of small diameter tube closed conduct water flow ultrasonic measurement optimization method and device |
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| CN113074787B (en) * | 2021-03-23 | 2022-05-31 | 中国石油天然气集团有限公司 | Method for determining outlet flow of non-full pipe diversion trench |
| CN116839689A (en) * | 2023-07-05 | 2023-10-03 | 深圳鼎智达表计信息科技有限公司 | Ultrasonic water meter and networking and measuring method thereof |
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