CN110285861A - A kind of ultrasonic flowmeter - Google Patents
A kind of ultrasonic flowmeter Download PDFInfo
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- CN110285861A CN110285861A CN201910545989.7A CN201910545989A CN110285861A CN 110285861 A CN110285861 A CN 110285861A CN 201910545989 A CN201910545989 A CN 201910545989A CN 110285861 A CN110285861 A CN 110285861A
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- 239000012530 fluid Substances 0.000 claims abstract description 44
- 238000012545 processing Methods 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims abstract description 12
- 230000007704 transition Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 9
- 239000004973 liquid crystal related substance Substances 0.000 claims description 8
- 238000003032 molecular docking Methods 0.000 claims description 5
- 238000002604 ultrasonography Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000011161 development Methods 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- IHQKEDIOMGYHEB-UHFFFAOYSA-M sodium dimethylarsinate Chemical class [Na+].C[As](C)([O-])=O IHQKEDIOMGYHEB-UHFFFAOYSA-M 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/662—Constructional details
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention belongs to flow monitoring technical fields, and in particular to a kind of ultrasonic flowmeter.Including fluid cavity, ultrasonic sensor and data and data acquisition processing device；Fluid cavity is the long tube of perforation, and pipe ends are from circular pipeline to pipeline center's compressive deformation at a rectangle pipeline；Ultrasonic sensor is set on the rectangle pipe side wall in fluid cavity, and with data acquisition processing device data connection.When air-flow passes through, from circular pipeline compressive deformation at a rectangle pipeline is passed through, constriction in flow area can effectively improve the precision and measurement range of ultrasonic sensor in this way, and greatly shorten the requirement to forward and backward flow development length；It is 2 times of pipe diameters in preceding straight air tubing length, under conditions of rear straight air tubing length is 1 times of pipe diameter, the accurate precision of flowmeter can reach 1 ± %.
Description
Technical field
The invention belongs to flow monitoring technical fields, and in particular to a kind of ultrasonic flowmeter.
Background technique
Ultrasonic flowmeter is to the effect of supersonic beam (or ultrasonic pulse) by detection fluid flowing with measuring flow
Instrument.
Existing ultrasonic flowmeter is using round straight pipe, and ultrasonic sensor is mounted on two sides by certain angle, one
It is a forward to emit pulse, another receiving, and record time t1, then reversely transmitting pulse, when another receives and record again
Between t2, latter two right time, which subtracts each other, obtains time difference t.When pipeline gas is static, i.e., without flow when, t=0, when there is flow, sound
The speed and air-flow of wave transmission are flow-related, and the time of forward and reverse is different, and t is exactly one related to pipeline gas flow velocity
Amount, t, which is converted into flow velocity by certain mathematical model, can be realized the measurement of flow.
However this method using straight-through circular pipe.It is very high to the requirement of preceding straight pipeline when carrying out flow measurement, that is, exist
The front and back of ultrasonic sensor must keep the straight pipe of certain length.It is round tube inside diameter that preceding straight pipe, which is generally greater than 30D(D)
More than, rear straight pipe is greater than 10 times or more.The accuracy and relevant repeatability that can be only achieved ± 1% require, such ultrasonic wave
Flowmeter on-site installation condition is very high, this just largely limits the use of flowmeter.
Summary of the invention
The purpose of the present invention is to provide a kind of ultrasonic flowmeters that detection accuracy is high.
Ultrasonic flowmeter provided by the present invention, including fluid cavity 1, ultrasonic sensor 2 and data and data acquisition
Processing unit 3；
The fluid cavity 1 is the long tube of perforation, and pipe ends are long at one section from circular pipeline to pipeline center's area's compressive deformation
Square pipe；
The ultrasonic sensor 2 is set on the rectangle pipe side wall in fluid cavity 1, and with data acquisition processing device 3
Data connection；
The data acquisition processing device 3 can receive and process the measuring signal of ultrasonic sensor 2, and feed back.
In the present invention, the rectangular area of 1 intracavity section of fluid cavity is circular area 40% ~ 80%；Rectangle wide high proportion
For 1:(1 ~ 10).
In the present invention, there are two the ultrasonic sensors 2, respectively as transmitting terminal and receiving end, is set to rectangle
On opposite two face of pipeline, the end of two ultrasonic sensors 2 is opposite.
In the present invention, the ultrasound emission direction of the ultrasonic sensor 2 and 1 length direction of fluid cavity are in 20 ° ~ 60 ° folders
Angle can form more accurate flow even if two ultrasonic sensors 2 are formed diagonally one in front and one in back in gas flow direction
Measurement.
In the present invention, pipe ends are by one section of circular pipeline compressive deformation rectangularity pipeline, as variation transition
Area 5, in the variation transition region 5, two relative edges of rectangle are one group, totally two groups (i.e. one group of one group of long side and short side)；Wherein extremely
In one group few, the circular edges of nozzle are oblique line to a central cross-section outer edge between the straight flange of the rectangle of corresponding position, is formed
Transition face, the oblique line totally two, symmetrical, the angle of two oblique lines is defined as cone angle beta (as shown in Figure 3)；The cone angle beta is
20 ° ~ 65 °, preferably 26 ° ~ 56 °.Within the scope of the set angle, when can guarantee that air-flow enters inner cavity interlude 4, stream pressure
Loss it is small and steady, interference noise is small, thus ensure that ultrasonic sensor 2 measure accuracy.
In the present invention, at the circular open at the both ends of the fluid cavity 1, screens are additionally provided with, enter fluid cavity 1 for making
Air-flow flow field more evenly, more stable measurement data is obtained with this.
In the present invention, hygrosensor and pressure detector are additionally provided in the fluid cavity 1, and fill with data acquisition process
Set 3 connections.
In the present invention, the data acquisition processing device 3 is equipped with the display equipment of display detection data, such as liquid crystal display
Screen.
In the present invention, it is equipped with wireless data transceiving device in the data acquisition processing device 3, remote data can be sent
To client and show.The wireless data transceiving device uses 4G or Wifi radio network technique, and the client can be
Connect the end PC or the mobile phone terminal of wireless network.
It further include the protection shell 6 for enveloping fluid cavity 1 in the present invention, 6 both ends of shell are respectively provided with dismountable end socket 7,
End socket 7 is equipped with the circular hole of corresponding 1 nozzle of fluid cavity, and 7 outer end face of end socket corresponds to the male-pipe that circular hole position is equipped with evagination；
The fluid cavity 1 is set in shell 6, and end socket 7 is covered in 6 both ends of shell, and circular hole and fluid cavity on end socket 7
The docking of 1 nozzle；Outer gas stream pipeline is then docked with the male-pipe of end socket 7；
The upper surface of the shell 6 is equipped with string holes, and 6 outer surface of shell is located at string holes position equipped with dismountable meter housing 8, data
Acquisition processing device 3 is set in meter housing 8, and 8 surface of meter housing is equipped with transparent region, by the transparent region it is observed that liquid
Crystal display screen；Ultrasonic sensor 2, hygrosensor and pressure detector are connected by data line with data acquisition processing device 3
It connects.In this way the connecting line that connects with data acquisition processing device 3 of ultrasonic sensor 2, hygrosensor and pressure detector by
Shell 6 is protected.
For the present invention in use, device is set in tracheae (such as coal gas round tube), i.e. fluid cavity front and back ends opening is same respectively
Round tube connection.When air-flow passes through, from circular pipeline compressive deformation at pass through a rectangle pipeline, constriction in flow area,
It can effectively improve the precision and measurement range of ultrasonic sensor in this way, and greatly shorten to forward and backward straight tube
The requirement of segment length is 2 times of pipe diameters in preceding straight air tubing length, under conditions of rear straight air tubing length is 1 times of pipe diameter,
The accurate precision of flowmeter can reach 1 ± %.
Meanwhile the length of variation transition region 5, the cone angle beta size pair are adjusted with this by adjusting the cone angle beta angular dimension
The pressure loss of air-flow has an impact, within the scope of set angle, when can guarantee that air-flow enters inner cavity interlude, stream pressure
Lose small and steady, interference noise is small, to ensure that the accuracy of ultrasonic sensor measurement；It prevents from testing in low-pressure air current
In, since atmospheric pressure lost is excessive during pipeline reducing diameter, noise is excessive, causes ultrasonic sensor that related data is not measured；
This ultrasonic flowmeter is set to be suitable for high and low pressure gas flow measurement.
The invention has the advantages that:
Crushing is small: crushing 180Pa when maximum stream flow, especially suitable for low voltage terminal user.
Range ratio is big: accuracy guarantee range can reach 200 times, and particularly suitable food and drink, dining room, hospital, various kinds of schools etc. use
Tolerance changes user greatly.
Zero point stability: minimum flow can be detected, therefore detectable pipe network system whether leaks and early warning.
Acoustic velocity measutement: it can realize that remote online checks flowmeter whether within accuracy rating using acoustic velocity measutement.
Forward and backward straight pipe is short: this flowmeter has the function of self-rectifying, and energy front and back straight pipe is very short (1D after preceding 2D), almost
It can ignore and not need that whole device of making an uproar is installed.
Detailed description of the invention
Fig. 1 is fluid cavity side structure schematic view.
Fig. 2 is the positive A-A schematic cross-sectional view of fluid cavity.
Fig. 3 is that fluid cavity overlooks partial schematic diagram.Broken section is the broken section in the duct of ultrasonic sensor in figure.
Fig. 4 is embodiment integral outer schematic elevation view.
Figure label: 1 is fluid cavity, and 2 be ultrasonic sensor, and 3 be data acquisition processing device, and 4 be inner cavity interlude,
5 be variation transition region, and 6 be shell, and 7 be end socket, and 8 be meter housing.
Specific embodiment
Embodiment
The present invention is monitored for hotel kitchen gas flow, and outer gas stream pipeline is gas piping.Including fluid cavity 1, surpass
Sonic sensor 2 and data and data acquisition processing device 3.
The fluid cavity 1 uses aluminum alloy long tube, overall length 220mm, and inner cavity is located at the nozzle cross sectional shape at both ends for circle
Shape, interior diameter 50mm；Inner cavity interlude 4 is section rectangle, and long 48mm, wide 20mm, interlude 4 overall length in inner cavity is 110mm；
I.e. from nozzle position, intracavity section becomes rectangle after one section of variation transition region 5, later again through one section of phase by circle
Same variation transition region 5, in pipe tail position, intracavity section becomes round again.
In the variation transition region 5, the long side of the rectangle of the circular edges of nozzle to corresponding position formed one it is larger (with circle
Shape side to corresponding position rectangle broadside formed transition face comparatively speaking) central cross-section be oblique line transition face, this tiltedly
Totally two, line (two broadsides), the angle of two oblique lines are defined as cone angle beta, and the cone angle beta is preferably 26 ° ~ 56 °；Such as Fig. 3 institute
Show, specifically can be also designed according to actual measurement stream pressure size and caliber.
Adjust the length that the cone angle beta angular dimension adjusts variation transition region 5 with this, pressure of the cone angle beta size to air-flow
Power loss has an impact, and within the scope of set angle, when can guarantee that air-flow enters inner cavity interlude 4, the loss of stream pressure is small
And it is steady, interference noise is small, to ensure that the accuracy that ultrasonic sensor 2 measures；It prevents in low-pressure air current test, by
Atmospheric pressure lost is excessive during pipeline reducing diameter, and noise is excessive, causes ultrasonic sensor 2 that related data is not measured；Make this
Ultrasonic flowmeter is suitable for high and low pressure gas flow measurement.
Described other region specific forms of variation transition region 5 are unlimited, natural transition.
4 position of inner cavity interlude is oblique to be equipped with detection duct, the detection duct two sides opposite through fluid cavity 1
Wall, i.e., in the lumen between form coaxial duct in the opposite two side walls of section 4, and detect duct and 1 length direction of fluid cavity
In α angle, 20 °≤α≤60 °, preferably 30 °.
There are two the ultrasonic sensors 2, is respectively arranged in the detection duct of two side walls；Wherein, ultrasonic wave passes
The end of probe of sensor 2 is towards in inner cavity interlude 4, and the sealed set between duct；The connecting line of ultrasonic sensor 2 then leads to
It crosses detection duct and is pierced by fluid cavity 1, connected with data acquisition processing device 3；Two ultrasonic sensors 2 are one in front and one in back, ultrasonic
Wave sensor end is opposite.As shown in Figure 1.
Be additionally provided with hygrosensor and pressure detector in the fluid cavity 1, ultrasonic sensor 2, hygrosensor and
Pressure detector is connected with data acquisition processing device 3；Data acquisition processing device 3 is equipped with liquid crystal display, can will detect
To data shown by liquid crystal display.
It is externally provided with a protection shell 6 for enveloping fluid cavity 1 in the fluid cavity 1,6 both ends of shell are respectively provided with removably
End socket 7, end socket 7 are equipped with the circular hole of corresponding 1 nozzle of fluid cavity, and 7 outer end face of end socket corresponds to the outer spiral shell that circular hole position is equipped with evagination
Line pipe.
The fluid cavity 1 is set in shell 6, and end socket 7 is covered in 6 both ends of shell, and sealing means can be docking
Place's setting rubber washer, and circular hole and the docking of 1 nozzle of fluid cavity on end socket 7；Male-pipe of the outer gas stream pipeline with end socket 7
Connection.
The upper end of shell 6 is equipped with string holes, and 6 outer surface of shell is located at string holes position equipped with dismountable meter housing 8, and data are adopted
Collection processing unit 3 is set in meter housing 8, and 8 surface of meter housing is equipped with transparent region, by the transparent region it is observed that liquid crystal
Display screen；The clear area can be covered on corresponding 8 position of meter housing of liquid crystal display using transparent acrylic.It is ultrasonic in this way
Wave sensor 2, hygrosensor and pressure detector are protected with the connecting line that data acquisition processing device 3 connects by shell 6.
It is equipped with wireless data transceiving device in the data acquisition processing device 3, remote data can be sent to client
And it shows.The wireless data transceiving device uses 4G or Wifi radio network technique, and the client can be wireless for connection
The end PC of network or mobile phone terminal.In this way, user also can remotely pass through computer or monitoring mobile phone data on flows whenever and wherever possible.
Circular hole position on the end socket 7 is additionally provided with screens, and the mesh of screens is continuously arranged hexagonal honeycomb
Shape mesh.
Experimental comparison's example
The present invention uses caliber DN50 table, and (pipe interior diameter is tested for 50mm) following methods and to record data as follows
1, preceding flow development length takes 0mm, 150mm, 300mm, 1000mm respectively；
2, without 90 ° of elbows before preceding straight pipe, and add 1 elbow plus 2 elbows, add 3 elbows；
3, using negative pressure method, standard scale is sonic nozzle, and detection gas are air；
4, Determination is carried out with flow point listed in record sheet and record.
Test data record sheet
Conclusion (of pressure testing)
Obtained according to analysis record data: the flowmeter realized using the present invention can be substantially reduced under ± 1% precision to preceding
The condition of flow development length limits.
Claims (10)
1. a kind of ultrasonic flowmeter, which is characterized in that adopted including fluid cavity (1), ultrasonic sensor (2) and data and data
Collect processing unit (3)；
The fluid cavity (1) is the long tube of perforation, and pipe ends are from circular pipeline to pipeline center's area's compressive deformation at one section
Rectangle pipeline；
The ultrasonic sensor (2) is set on the rectangle pipe side wall in fluid cavity (1), and fills with data acquisition process
Set (3) data connection；
The data acquisition processing device (3) can receive and process the measuring signal of ultrasonic sensor (2), and feed back.
2. ultrasonic flowmeter as described in claim 1, which is characterized in that the rectangular surfaces of fluid cavity (1) intracavity section
Product is circular area 40% ~ 80%；Rectangle wide high proportion is 1:(1 ~ 10).
3. ultrasonic flowmeter as described in claim 1, which is characterized in that there are two the ultrasonic sensors (2), respectively
It as transmitting terminal and receiving end, is set on opposite two face of rectangle pipeline, the end of two ultrasonic sensors (2)
Relatively.
4. ultrasonic flowmeter as described in claim 1, which is characterized in that the ultrasound emission of the ultrasonic sensor (2)
Direction and fluid cavity (1) length direction are in 20 ° ~ 60 ° angles, even if two ultrasonic sensors (2) are in gas flow direction
Formation is diagonal one in front and one in back, can form more accurate flow measurement.
5. ultrasonic flowmeter as described in claim 1, which is characterized in that pipe ends by circular pipeline compressive deformation at
One section of rectangle pipeline, as transition region (5) are changed, in the variation transition region (5), two relative edges of rectangle are one group, altogether
Two groups；In wherein at least one group, the circular edges of nozzle are formed outside a central cross-section between the straight flange of the rectangle of corresponding position
Edge is the transition face of oblique line, and the oblique line totally two, symmetrical, the angle of two oblique lines is defined as cone angle beta；The cone angle beta is 20 °
~65°。
6. ultrasonic flowmeter as described in claim 1, which is characterized in that the circular open at the both ends of the fluid cavity (1)
Place, is additionally provided with screens, and more stable measurement is more evenly obtained with this for making into the flow field of the air-flow of fluid cavity (1)
Data.
7. ultrasonic flowmeter as described in claim 1, which is characterized in that be additionally provided with temperature sensing in the fluid cavity (1)
Device and pressure detector, and same data acquisition processing device (3) connects.
8. ultrasonic flowmeter as described in claim 1, which is characterized in that the data acquisition processing device (3) is equipped with
Show the display equipment of detection data, such as liquid crystal display.
9. ultrasonic flowmeter as described in claim 1, which is characterized in that be equipped in the data acquisition processing device (3)
Remote data can be sent to client and shown by wireless data transceiving device；The wireless data transceiving device using 4G or
Wifi radio network technique, the client can be the end PC or the mobile phone terminal of connection wireless network.
10. ultrasonic flowmeter as described in claim 1, which is characterized in that further include outside the protection for envelope fluid cavity (1)
Shell (6), shell (6) both ends are respectively provided with dismountable end socket (7), and end socket (7) is equipped with the circular hole of corresponding fluid cavity (1) nozzle,
End socket (7) outer end face corresponds to the male-pipe that circular hole position is equipped with evagination；
The fluid cavity (1) is set in shell (6), and end socket (7) is covered in shell (6) both ends, and the circle on end socket (7)
Hole and the docking of fluid cavity (1) nozzle；Outer gas stream pipeline then same end socket (7) male-pipe docking；
The upper surface of the shell (6) is equipped with string holes, and shell (6) outer surface is located at string holes position equipped with dismountable meter housing
(8), data acquisition processing device (3) is set in meter housing (8), and meter housing (8) surface is equipped with transparent region, transparent by this
Region is it is observed that liquid crystal display；Ultrasonic sensor (2), hygrosensor and pressure detector pass through the same data of data line
Acquisition processing device (3) connection；Ultrasonic sensor (2), hygrosensor and the same data acquisition process of pressure detector in this way
The connecting line of device (3) connection is protected by shell (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910545989.7A CN110285861A (en) | 2019-06-23 | 2019-06-23 | A kind of ultrasonic flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910545989.7A CN110285861A (en) | 2019-06-23 | 2019-06-23 | A kind of ultrasonic flowmeter |
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| CN110285861A true CN110285861A (en) | 2019-09-27 |
Family
ID=68004899
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| CN201910545989.7A Pending CN110285861A (en) | 2019-06-23 | 2019-06-23 | A kind of ultrasonic flowmeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798066A (en) * | 2020-12-31 | 2021-05-14 | 苍仪科技(上海)有限公司 | Ultrasonic flowmeter with rectangular flow channel |
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- 2019-06-23 CN CN201910545989.7A patent/CN110285861A/en active Pending
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