CN108318091A - A kind of ultrasonic flowmeter unit and device - Google Patents
A kind of ultrasonic flowmeter unit and device Download PDFInfo
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- CN108318091A CN108318091A CN201810073624.4A CN201810073624A CN108318091A CN 108318091 A CN108318091 A CN 108318091A CN 201810073624 A CN201810073624 A CN 201810073624A CN 108318091 A CN108318091 A CN 108318091A
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- 238000013016 damping Methods 0.000 claims description 41
- 238000005192 partition Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 abstract description 11
- 238000005516 engineering process Methods 0.000 abstract description 11
- 239000007789 gas Substances 0.000 description 81
- 238000000034 method Methods 0.000 description 39
- 238000005259 measurement Methods 0.000 description 13
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 8
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- 230000005540 biological transmission Effects 0.000 description 4
- 238000000926 separation method Methods 0.000 description 3
- 239000000567 combustion gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- CUZMQPZYCDIHQL-VCTVXEGHSA-L calcium;(2s)-1-[(2s)-3-[(2r)-2-(cyclohexanecarbonylamino)propanoyl]sulfanyl-2-methylpropanoyl]pyrrolidine-2-carboxylate Chemical group [Ca+2].N([C@H](C)C(=O)SC[C@@H](C)C(=O)N1[C@@H](CCC1)C([O-])=O)C(=O)C1CCCCC1.N([C@H](C)C(=O)SC[C@@H](C)C(=O)N1[C@@H](CCC1)C([O-])=O)C(=O)C1CCCCC1 CUZMQPZYCDIHQL-VCTVXEGHSA-L 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 210000000981 epithelium Anatomy 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000012092 media component Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000002754 natural gas substitute Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 238000007789 sealing Methods 0.000 description 1
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- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
Classifications
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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
- 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 present invention relates to a kind of ultrasonic flowmeter unit and devices.Ultrasonic flowmeter unit includes shell, a pair of sensors and fairing, and a pair of sensors includes first sensor and second sensor, and first sensor and second sensor are respectively arranged at the both ends in the shell；Shell is in venturi tube structure；It is equipped with the fairing in the first sensor or second sensor of one end of venturi tube structure, for being adjusted to the gas flow pattern for entering the ultrasonic flowmeter unit.The present invention passes through multiple rectification, gas flow pattern is set to reach ideal form in metering region, monophonic can be used accurately to measure flow, the prior art is solved because monophonic cannot carry out the accurate metering of Complex Flow Status gas, it is solved simultaneously using multichannel design scheme because of the contradiction between cost the is significantly increased cost and precision to be formed, ensure that extensive use of the ultrasonic technology in city gas metering field.
Description
Technical field
The present invention relates to ultrasonic flow rates to measure technical field, more particularly, to a kind of Ultrasonic Wave Flowmeter and device.
Background technology
Recently as national policy of constantly putting into effect encourage that clean energy resource, more and more terminal users is used to use natural
Gas Substitute coal improves environmental quality to reduce air pollution.But the low pressure natural gas metering device in city is gone back mostly
Using mechanical technology, such as family and epithelium table, waist wheel, turbine flowmeter etc., such flowmeter used in industrial and commercial producer
(table) there are mechanical components, and as run time lengthens, mechanical drive department branch makes Trade Measures produce because of dirty, abrasion etc.
Raw deviation.Since common mechanical technique gauge table and flowmeter do not have self-diagnosing function, measuring instrument can not be judged
Whether it is in normal operating conditions, while the generation of gas phenomenon steathily can not be avoided, causes gas company often larger for reporting the accomplishment of a task or termination of a mission,
Lead to operating loss.
Gas ultrasonic flowmeter has intelligent diagnostics function because of its no-rotary part, is obtained in the defeated high pressure line point defeated station of length
To extensive use.It is generally used time difference method, passes through two in accordance with related international and national standard, existing gas ultrasonic flowmeter
A sonac is symmetrical arranged to measure the forward and backward direction sonic transmission time, exports gas flow rate, reaches meter gaseous stream
The purpose of amount.Time difference method schematic diagram is shown in attached drawing 1.The following formula of Computing Principle of time difference method：
And
According to above-mentioned formula, derive that time difference method formula is：
And
Wherein：
tABAcoustic transit time of=the sensors A to sensor B
tBAAcoustic transit times of=sensor the B to sensors A
L=measurement distances
vtThe gas flow rate that=time difference method measures
The c=velocities of sound
Time difference method requirement：Presence must be matched by constituting the sensor of metering sound channel；Sensor itself can emit sound wave,
The acoustic signals of opposite pairing sensor can be received.
Above-mentioned time difference method formula (1) indicates：Theoretically, gas flow rate is only related with transmission time and measurement distance, with
Temperature, pressure, component and the velocity of sound of measured medium etc. are not related, therefore it can ensure under the field condition of complexity variation
Accurate flow velocity measures.This is also the main reason for time difference method can be widely used in speed mode gas flowmeter.
Time difference method can obtain the measurement velocity of sound c propagated in gas simultaneously.According to sentencing for American Gas association (AGA) publication
Determine method, actual sound propagation velocity C is associated with the live influence factor such as pressure, temperature and media components, if the time difference
Relatively large deviation is generated between the method velocity of sound c detected and real velocity of sound C, such as more than 0.5%, then can be shown that live influence factor
Changed.
It is common for correlation quadraphonic gas ultrasonic flowmeter at present.It is each pair of using the ultrasonic flowmeter of time difference method
Associated sensor constitutes an independent metering sound channel, it is generally the case that for the measurement accuracy and redundancy for ensureing relatively high
Backup, Trade Measures are mostly two sound channels or more with gas ultrasonic flowmeter.
But most of families with to consume combustion gas total amount industry and commerce user's year relatively fewer, also therefore cause it is corresponding be used in it is low
Press the measuring accuracy of city gas metering table of less demanding, instrument purchasing cost control is also more stringent.City gas at present
The ultrasonic flowmeter (table) for the monophonic time difference method that market occurs is measured, cost is although cheap, but if constituting monophonic
One of sensor breaks down, then the sound channel also just loses function of measuring simultaneously, can not accomplish to give warning in advance, redundancy it is standby
Part etc. intelligent diagnostics and compensation function, cause to cause metering loss to gas company, also can thus generate metering dispute and bad
Social influence.If two sound channels (two pairs of sonacs) using redundancy backup or more sound channel design scheme, if cost
It will be significantly increased, gas company can reduce the usage quantity of multichannel ultrasonic flowmeter because of cost control.Therefore it is existing at
Originally the contradiction between redundancy, extensive use of the ultrasonic technology in city gas metering field is constrained.
Therefore, to solve the above-mentioned problems, the present invention proposes a kind of to can be used what monophonic accurately measured flow
Technology；Meanwhile in order to solve to be connected directly with complicated gas inlet duct configuration because measuring pipeline section in existing hypersonic flow scale,
It causes to measure inaccurate problem caused by gas flow pattern is unstable, the present invention is quasi- to propose a kind of new ultrasonic flowmeter unit and dress
It sets.
Invention content
The present invention is intended to provide a kind of ultrasonic flowmeter unit and device, can be used monophonic and are accurately surveyed to flow
Amount solves the problems, such as the prior art because the sensor failure in monophonic just loses function of measuring, while solving to adopt
With the multichannel design scheme of redundancy backup because of the contradiction between cost the is significantly increased cost and redundancy to be formed, ensure ultrasonoscope
Extensive use of the amount technology in city gas metering field, while gas flow pattern being made to reach ideal in metering region
Form.
The present invention provides a kind of ultrasonic flowmeter unit, including shell, a pair of sensors and fairing, wherein described
A pair of sensors includes first sensor and second sensor, and the first sensor and second sensor separation are set to described
Both ends in shell；The shell is in venturi tube structure；The first sensor of described one end in venturi tube structure or
Two covers disposed on sensor have the fairing, for being adjusted to the gas flow pattern for entering the ultrasonic flowmeter unit.
Above-mentioned ultrasonic flowmeter unit, the fairing include radome fairing and straightener(stator) blade, the radome fairing sealing
It is wrapped in the first sensor or second sensor of described one end in venturi tube structure, the straightener(stator) blade is along described whole
Flow cover outer surface radial arrangement and axially extend, protruded outward on the length direction of the ultrasonic flowmeter unit in
The radome fairing setting.
Above-mentioned ultrasonic flowmeter unit, the radome fairing are in drops.
Above-mentioned ultrasonic flowmeter unit, the straightener(stator) blade are one group of blade of uniform arranged radially.
Above-mentioned ultrasonic flowmeter unit, the straightener(stator) blade axially extend.
The cross section of above-mentioned ultrasonic flowmeter unit, the straightener(stator) blade is straight line.
The present invention also provides a kind of ultrasonic flowmeter units, including shell, a pair of sensors and fairing, wherein institute
It includes first sensor and second sensor to state a pair of sensors, and the first sensor and second sensor separation are set to institute
State the both ends in shell；The shell is in venturi tube structure；It is set respectively in the first sensor and the second sensor
There is the fairing, for being adjusted to the gas flow pattern for entering the ultrasonic flowmeter unit.
The present invention also provides a kind of ultrasonic flow rate counter devices, including damping case and above-mentioned ultrasonic flowmeter unit, wherein
The damping case is in " recessed " shape, including shell and inner cavity；The ultrasonic flowmeter unit is symmetrically disposed on the damping box cavity
Centre position, the ultrasonic flowmeter unit and the damping case are divided into two parts respectively by partition board from middle part.It is described super
Sound metering units can pass through partition board and two inner cavities of the damping case are connected, and the gas in two inner cavities can only be by described
Ultrasonic unit mutually circulates.
It is equipped with gas access and gas vent away from the side of the ultrasonic flowmeter unit farther out on the damping case, it is described
Gas access and gas vent are connected to described two inner cavities respectively.
Above-mentioned device, the gas access be one, be set to it is described damping case one end, the gas access with it is described
Damp the inner cavity connection of case.
Above-mentioned device, the gas vent are one, are set to the other end of the damping case, the gas vent and institute
State another inner cavity connection of damping case.
Above-mentioned device, the ultrasonic flow rate counter device further includes instrument display panel, is set to the indent of the damping case.
The ultrasonic flowmeter unit and device of the present invention, by multiple rectification, make gas flow pattern metering region reach compared with
For ideal form, monophonic can be used, flow is accurately measured, solves background technology because of a biography in monophonic
The problem of sensor failure just loses function of measuring, while solving the multichannel design scheme using redundancy backup because of cost
The contradiction between the cost and redundancy to be formed is significantly increased, ensure that ultrasonic technology is wide in city gas metering field
General application.
Description of the drawings
Fig. 1 is the flow diagram that background technology time difference method flow velocity measures；
Fig. 2 is the flow diagram that ultrasonic flow rate of the present invention measures；
Fig. 3 is the dimensional structure diagram of ultrasonic flowmeter unit of the present invention；
Fig. 4 is the schematic cross-sectional view of ultrasonic flowmeter unit of the present invention；
Fig. 5 is the half section structure diagram of ultrasonic flow rate counter device of the present invention.
Specific implementation mode
Below in conjunction with drawings and examples, the specific implementation mode of the present invention is described in more details, so as to energy
The advantages of enough more fully understanding the solution of the present invention and various aspects.However, specific embodiments described below and implementation
Example is for illustrative purposes only, rather than limiting the invention.
The ultrasonic flowmeter unit of the present invention and the metering method of device, can be flowed only with monophonic sonac
The metering of amount.This kind of method can be described as time drift method, mainly include the following steps：In a pair of sensors for constituting metering sound channel
First sensor emit sound wave, receive this in sensor second sensor reflection acoustic signals；Measure described first
Sensor emission and the two-way time reflected through second sensor；Using the two-way time of the transmitting and reflection as the meter of flow velocity
The amount time is measured；The metering of flow is carried out according to the flow velocity.It is noted here that first sensor and the second sensing
Device can be arbitrarily designated, and not be refered in particular to.
Above-mentioned time drift method is referred to herein as bounce technique.The time difference method of the corresponding prior art, also known as
For to the method for penetrating.The schematic diagram of time drift method is shown in attached drawing 2.
The principle of time drift method derives from the inspiration of daily phenomenon.Example：It rows the boat in hydrostatic, A points to B point air line distances
L is such as rowed the boat with constant speed c, is t the time required to from A points to B points1, it is t the time required to from B points to A points2, it is round-trip needed for total time be
T, then:
And
Obviously, t1Equal to t2, and
If there is the constant flow rate flow that A to B is flowed to, when flow velocity v is not zero, then：
And
Obviously, t1Not equal to t2, the time drifted about, and
The time drift method formula derived is：
It applies in gas ultrasonic flowmeter, in the formula (3) of time drift method：
The round-trip reflection sound wave transmission time that t=sensors As measure
L=measurement distances
vdThe gas flow rate that=time drift method measures
The c=velocities of sound
The requirement of time drift method：There are one a pair of sensors for constituting metering sound channel to work normally；Sensor is sent out
Sound wave is penetrated, the acoustic signals of opposite sensor reflection are received.
Time drift method formula (3) indicates：Gas flow rate has outside the Pass with transmission time and measurement distance, and also and real velocity of sound
C has much relations.The velocity of sound that time drift method uses in the present invention can be the velocity of sound c derived according to time difference method, such as public
Formula (2).
The redundancy metering design of monophonic two algorithm can be used in the gas ultrasonic flowmeter (table) of the present invention, can extensive use
The metered conditions such as Gas Components, pipeline pressure it is relatively stable, have fixed period and the measuring accuracy city of less demanding of stopping the supple of gas or steam
City gas metering field.
The redundancy of the monophonic two algorithm is measured, including time difference method and time drift method.In the pairing of monophonic
In the case that sonac all works normally, two algorithms use same measurement distance and match sensor measurement
The data such as acoustic transit time；Two algorithm measurements go out two air flow velocities；The air flow velocity measured with time difference method
On the basis of, the air flow velocity that time drift method is measured is as redundancy ratio logarithm.
The Redundancy Design breaks down in the one of sonac of monophonic, only there are one sonacs
When normal work, fault alarm can be sent out, processor sends out instruction, and gas flow rate is converted into the sensor of normal work on time
Between the air flow velocity measured of drift method.
In the case where single sonac breaks down, metering processing unit can send out alarm signal, and application is repaired,
The sonac of normal operation can be enabled simultaneously, chosen and called effective sound velocity the recently measured in memory, floated using the time
Shifting method measures the two-way time after ultrasonic reflections, ensures that accurate flow velocity measures.Monophonic two algorithm Redundancy Design, provides one
The inexpensive Ultrasonic Wave Flowmeter amount solution of management and redundancy guarantee is for ease of maintenaince safeguarded, facilitated to kind, meets city
The demand of the professional standard and client's low cost of combustion gas measuring instrument.
Corresponding above-mentioned monaural stream measuring method, the present invention propose the new structure design of flowmeter and device, with
Will pass through multiple rectification, gas flow pattern made to reach ideal form in metering region, and can be used monophonic to flow into
Row is accurate to be measured.
The specific practice of the redundancy metering of above-mentioned monophonic two algorithm, as shown in Figure 3,4, the present invention provides a kind of ultrasound
Flow meter unit F, including shell 1, a pair of sensors 2 and fairing 3, wherein the pair of sensor 2 includes the first sensing
Device 21 and second sensor 22, the first sensor 21 and second sensor 22 are set to along axis in the shell 1 respectively
Both ends；The shell 1 is in venturi tube structure；The first sensor 21 or second of described one end in venturi tube structure passes
Sensor 22 is equipped with the fairing 3, for being adjusted to the gas flow pattern for entering the ultrasonic flowmeter unit.This hair
Bright middle first sensor 21 or second sensor 22 are limited without fixed position, merely to distinguishing the number carried out.So set
Meter is just so that monaural stream measurement is achieved, in the progress gas input of venturi tube structure one end, you can measure this end biography
Sensor emits sound wave and the velocity of sound after another end sensor reflection sound wave, and then obtains the metering numerical value of flow.
As shown in figure 4, further, the fairing 3 includes radome fairing 31 and straightener(stator) blade 32, the straightener(stator) blade is solid
Determine and is co-axially mounted with type radome fairing.Sonac is installed in the radome fairing.31 sealed envelope of the radome fairing is in described
On the first sensor 21 or second sensor 22 of one end of venturi tube structure, the straightener(stator) blade 32 is along the radome fairing 31
Outer surface radial arrangement, protrude outward on the length direction of the ultrasonic flowmeter unit and set in the radome fairing 31
It sets.After being designed so that gas enters ultrasonic flowmeter unit, vortex form is eliminated through the axially extending blade of radial arrangement,
31 forced gas of rectified cover accelerate to flow axially further again, into after metering region, obtain not being vortexed substantially steady
Determine gas flow pattern, while utmostly reducing the pressure loss.
The shell for having Venturi tube feature and straightener(stator) blade, radome fairing will successively enter flowmeter metering section
Gas flow pattern is adjusted, and gas flow rate is measured by the sonac, to derive gas flow.
Preferably, the radome fairing 31, drops radome fairing and venturi reducing pipe coordinate, with the minimum pressure loss,
Accelerate and adjusts gas flow pattern to perfect condition.
Preferably, the straightener(stator) blade 32 is one group of evenly distributed blade.
Further, the cross section of the straightener(stator) blade 32 is straight line, axially extends setting.It is designed so that gas
It is transmitted directly to radome fairing 31 by impeller clearance, reduces vortex, forced gas accelerates to flow in an axial direction, adjusts gas flow pattern
Meanwhile utmostly reducing the pressure loss.
In order to convenient for the both ends of ultrasonic flowmeter unit carry out gas input and output, still as shown in Figure 1, the present invention also
There is provided a kind of ultrasonic flowmeter unit F, including shell 1, a pair of sensors 2 and fairing 3, wherein the pair of sensor 2
Including first sensor 21 and second sensor 22, the first sensor 21 and the separation of second sensor 22 are set to outside described
Both ends in shell 1；The shell 1 is in venturi tube structure；On the first sensor 21 and the second sensor 22 respectively
Equipped with the fairing 3, for being adjusted to the gas flow pattern for entering the ultrasonic flowmeter unit.
As shown in figure 5, the present invention also provides a kind of ultrasonic flow rate counter device, including damping case 4 and above-mentioned ultrasonic flow rate
Count unit F, wherein the damping case 4 is in " recessed " shape, including shell 41 and inner cavity 42, inner cavity 47；The ultrasonic flowmeter unit
It is symmetrically disposed on the centre position of the damping box cavity 42 and inner cavity 47, the ultrasonic flowmeter unit and the damping case 4
Two parts are divided by partition board 43 respectively from middle part.The ultrasonic unit can pass through partition board will be in two of the damping case
Chamber is connected so that the gas in two inner cavities can only mutually be circulated by the ultrasonic unit.
On the damping case 4 gas access 44 and gas vent are equipped with away from the side of the ultrasonic flowmeter unit farther out
46, the gas access 44 is connected to the inner cavity 42, and the gas vent 46 is connected to the inner cavity 47, and gas is from described interior
Chamber 42 flows into inner cavity 47 through ultrasonic flow rate unit F.The device is the ultrasonic flowmeter unit F of corresponding above-mentioned carry out monophonic metering
And set, flowmeter is packed into the damping case 4 convenient for rectification so that the inner cavity 42 that gas initially enters damping case 4 carries out gas stream
State is uniformly distributed, then the 3 further rectification of fairing for passing through flowmeter so that measuring can be more accurate.
When carrying out flow measurement, the gas access 44, gas vent 46 are respectively one, are respectively arranged on the damping case
4 one end, the gas access 44, gas vent 46 are connected to after damping box cavity with the ultrasonic flowmeter unit.Gas
The inner cavity 42 for entering damping case 4 through entrance 44 is uniformly distributed, and pressure official post gas stream enters ultrasonic metering units F, through multiple rectification,
After arrival metering region is accurately measured, inner cavity 47 is flowed into, the outlet 46 through damping case 4 is flowed out, and measurement process is completed.
Above-mentioned device, the ultrasonic flowmeter cell arrangement may also include instrument display panel 45, be set to the damping case 4
Indent.The instrument display panel 45 is movable to be installed on damping case 4, to adapt to gas flow direction in gas pipeline, side
Just in-site installation.
Since present invention employs the measurements that ultrasonic flowmeter unit and device carry out flow, by damping case and flowmeter
Multiple rectification, wherein damping case is different from the container body of outer cover of current ultrasonic flowmeter, flowmeter and will have been enter into flowmeter
Gas pipeline wraps up, and only plays the role of protection, but designs gas buffer cavity in damping case so that flue
Road is not direct to be connected with flowmeter, and gas first enters damping box cavity after pipeline output from the gas access of damping case, by gas
After body is uniformly distributed stabilization, then so that gas is entered ultrasonic flowmeter unit and carry out further rectification and measure, to make gas stream
State reaches ideal form in metering region.
Meanwhile the present invention can be used monophonic and accurately be measured flow, solve background technology because in monophonic
The problem of one sensor failure just loses function of measuring, while solving the multichannel design scheme using redundancy backup
Because the contradiction between the cost and redundancy to be formed is significantly increased in cost, modularization is also beneficial to live rapid-maintenance and safeguards, ensures
Extensive use of the ultrasonic technology in city gas metering field.
Finally it should be noted that：Obviously, the above embodiment is merely an example for clearly illustrating the present invention, and simultaneously
The non-restriction to embodiment, as the present invention is also applicable in the flow meter implementations design of two-channel or more.For fields
Those of ordinary skill for, other different forms of changes or modifications may be made based on the above description.Here
There is no need to be exhaustive to all embodiments.And thus changes and variations that derived from still in
Among protection scope of the present invention.
Claims (11)
1. a kind of ultrasonic flowmeter unit, which is characterized in that including shell, a pair of sensors and fairing, wherein
The pair of sensor includes first sensor and second sensor, and the first sensor and second sensor are set respectively
It is placed in the both ends in the shell；
The shell is in venturi tube structure；
The first sensor or second sensor of described one end in venturi tube structure be equipped with the fairing, for pair
Gas flow pattern into the ultrasonic flowmeter unit is adjusted.
2. ultrasonic flowmeter unit according to claim 1, which is characterized in that the fairing includes radome fairing and whole
Blade is flowed, the radome fairing sealed envelope is in the first sensor or second sensor of described one end in venturi tube structure
On, the straightener(stator) blade is along the radially uniform arrangement in the outer surface of the radome fairing and axially extends, in the ultrasonic flowmeter
It protrudes outward on the length direction of unit and is arranged in the radome fairing.
3. ultrasonic flowmeter unit according to claim 2, which is characterized in that the radome fairing is in drops.
4. ultrasonic flowmeter unit according to claim 2, which is characterized in that the straightener(stator) blade is radially uniform arrangement
One group of blade, and axially extend.
5. ultrasonic flowmeter unit according to claim 2, which is characterized in that the cross section of the straightener(stator) blade is straight
Line.
6. a kind of ultrasonic flowmeter unit, which is characterized in that including shell, a pair of sensors and fairing, wherein
The pair of sensor includes first sensor and second sensor, and the first sensor and second sensor are set respectively
It is placed in the both ends in the shell；
The shell is in venturi tube structure；
It is respectively equipped with the fairing in the first sensor and the second sensor, for entering the hypersonic flow
The gas flow pattern of gauge unit is adjusted.
7. a kind of ultrasonic flow rate counter device, which is characterized in that including damping case and any hypersonic flow of claim 1 to 6
Gauge unit, wherein
The damping case is in " recessed " shape, including shell and inner cavity；
The ultrasonic flowmeter unit is symmetrically disposed on the centre position of the damping box cavity, and the damping case is by partition board in
Part is divided into two inner cavities, and the ultrasonic unit connects two inner cavities of the damping case as gas passage；The resistance
On Buddhist nun's case gas access and gas vent, the gas access and gas are equipped with away from the side of the ultrasonic flowmeter unit farther out
Outlet is connected to described two inner cavities respectively.
8. device according to claim 7, which is characterized in that the gas access is one, is set to the damping case
One end, the gas access are connected to an inner cavity of the damping case.
9. device according to claim 8, which is characterized in that the gas vent is one, is set to the damping case
The other end, the gas vent are connected to another inner cavity of the damping case.
10. device according to claim 7, which is characterized in that two inner cavities of the damping case are separated by a partition board, institute
It states ultrasonic unit and passes through partition board and two inner cavities of the damping case are connected so that gas in described two inner cavities is logical
The ultrasonic unit is crossed mutually to circulate.
11. device according to claim 7, which is characterized in that the ultrasonic flow rate counter device further includes instrument display panel,
Set on the indent of the damping case.
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| CN201810073624.4A CN108318091A (en) | 2018-01-25 | 2018-01-25 | A kind of ultrasonic flowmeter unit and device |
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