CN109520595A - A kind of direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER - Google Patents
A kind of direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER Download PDFInfo
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- CN109520595A CN109520595A CN201910032885.6A CN201910032885A CN109520595A CN 109520595 A CN109520595 A CN 109520595A CN 201910032885 A CN201910032885 A CN 201910032885A CN 109520595 A CN109520595 A CN 109520595A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
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Abstract
The invention belongs to gas flow measurement technical fields, disclose a kind of direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER, including standard meter apparatus, the standard scale includes uniform air flow generator and instrument of tracing to the source, the front port of uniform air flow generator is connected to form airflow channel with rear port, and the conduit wall of airflow channel is according to Wei Xinsi base curves or Bernoulli's lemniscate curve shrinkage；Uniform air flow generator side wall is equipped with pressure tappings, and pressure tappings connect instrument of tracing to the source；The rear port of uniform air flow generator is sequentially communicated upstream tube, checklist, downstream tube and blower, the checklist and instrument of tracing to the source are all connected with detection control apparatus, detection control apparatus connects frequency changing regulating speed control apparatus, and frequency changing regulating speed control apparatus is also electrically connected with blower and controls the revolving speed of blower.The configuration of the present invention is simple, it is easy to use, it realizes and is easy, and measurement accuracy is high, stability is good, is worth of widely use.
Description
Technical field
The invention belongs to gas flow measurement technical fields, and in particular to a kind of direct corrector heavy caliber gas flow mark
Standard apparatus.
Background technique
Gas flow standard device be one it is complete it is independent, high precision flowrate measurement value can be provided to gas flowmeter and set
It is standby, it can be used for the metering transmitting of country.
Gas flow standard device includes direct corrector and indirect corrector.Direct corrector standard set-up refers to
When correcting gas flow, by operating a gas flow sensor, it is (tens of thousands of to hundreds of thousands m to be sequentially generated any amount3/ h)
Standard set-up.Indirect corrector standard set-up refers to obtaining greatly using more small-bore calibrating gas flowmeters are used in parallel
Flux modification；Or multipoint method is used, the velocity flow profile of total cross-section is obtained by Mathematical treatment, to obtain the gas stream of big flow
Measure measurement result.CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER all uses indirect correction method in the world at present.
It is " Caochong weighing elephant " using the method corrected indirectly, measures heavy caliber gas with many flow standard sensors
Flow, as long as air velocity becomes larger a bit so bore is larger, this mode corrected indirectly just be not suitable for, cannot
Meet the requirement of measurement.Technically, small-bore sensor is exactly to install flow sensor in the duct and obtain flow letter
Number, such as throttle type sensor, industry spot major part flow measurement at present is all in this way.But this method
Disadvantage is exactly that pressure loss is very big, because it is to destroy former flow field, and generate the shape being largely vortexed under the conditions of the steady motion of a fluid
Flow signal is obtained under state, this just determines that this technology can not obtain high precision, as applying to heavy caliber flow
It is even more impossible in measurement.
Heavy caliber gas flowmeter needs to adapt to heavy caliber gas flow standard, and people do not have from theory and practice at present
It finds out and solves heavy caliber gas flowmeter and calibration solution.The all not whole heavy caliber gas flow mark in countries in the world
Standard apparatus is for measuring transmitting；Existing way is that it is used in parallel to mix a few set calibrating gas flowmeters using method of standard table.Example
Such as: Canada is in parallel with two DN200 pipelines with four DN400 pipelines, does standard scale using turbine flowmeter, has devised north
The maximum Natural gas standard device of U.S., bore 750mm；In Holland, using 10 parallel positive displacement gas flowmeter groups
At standard set-up, each maximum stream flow is 400m3/h.Using this indirect method above, from production, investment, power, account for
Ground, consumption etc. consider but not being a simple thing.The problem of how designing CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER, people
Class has done very more work, but the difficulty currently encountered is more.
How the state of the art of heavy caliber measurement of gas flow standard is treated? if none correct feasible method,
It will be unable to advance；People must detach from original technical level status.
Original technical solution is to solve the measurement of heavy caliber gas flow standard indirectly, and this method has fettered
The operative orientation of people.How heavy caliber problem solves, whoever does not know, so people can only use small-bore technical solution solution
Certainly heavy caliber problem then produces " measurement indirectly " method.Before new method is not found, people can only be with small-bore
Technology solves the problems, such as heavy caliber application technology, difficult larger, and people always want to really solve heavy caliber by the effort of people
Problem.
For example, people attempt to be sprayed with velocity of sound in " technological design of DN600 CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER is studied "
Mouth method increases flow；In " design of heavy caliber gas flow system ", using the survey pipe type flowmeter of Pitot tube measuring principle；
The heavy caliber gas flow calibration thinking proposed in " research based on wind tunnel device calibration heavy caliber gas flowmeter ".However
Even if there are many researchs, measurement indirectly is still be unable to do without for heavy caliber gas flow measurement method, there is no really solutions by people
The certainly technical problem.
Mete-wand itself means that it is a High Definition Systems, has low uncertainty, and repeatability is high, reproduction
Property is strong.This feature is treated from hydromechanical angle, high-precision flow detection comes the flow field of self-stabilization, stable flow field meaning
Taste flow be it is uniform, vortes interference is minimum, until being reduced to the highest level for not influencing high-precision measuring.And it is vortexed and reduces
To desired level, it is meant that the principle for generating flow signal is no longer throttling technology, is no longer artificially to go to change with throttling element
Become steady motion of a fluid flow and obtain flow signal, and method should be looked in normal flowing naturally.In fact if flowing is uniform
, then just being solved naturally about stable flow field, low-loss, the problem that reproducible, repdocutbility is strong.In hydrodynamics
In, it is understood that Turbulent Boundary Layer flow rate calculation mechanism, this can be used as the theoretical basis solved the problems, such as.
Therefore, technical problem urgently to be resolved existing for this field, needs to propose more reasonable technical solution, solves
The above technical problem.
Summary of the invention
It is an object of that present invention to provide a kind of direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETERs, it is intended to attached according to turbulent flow
Surface layer calculating mechanism, the method that pressure signal is obtained by uniform air flow generator and in uniform field, realizes and uses boundary-layer
Theory meter mark flow, has been made CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER with the method directly corrected, has been capable of providing and stablizes, is repeated
Good, the good and high-precision flow measurement of repdocutbility.
The technical scheme adopted by the invention is as follows:
A kind of direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER, including single standard meter apparatus；The single standard
The bore range of meter apparatus is φ 300mm- φ 2000mm；Gas flow rate >=40m/s in the single standard meter apparatus, the mark
The uncertainty of quasi- meter apparatus is 0.3%-0.5%；The standard meter apparatus integrally directly gives normal flow, the normal stream
Measure >=2.4 ╳ 105m3/h；The normal flow is calculated by the following formula:
Wherein, mIt is realIndicate normal flow, unit kg/h；KPIndicate pressure correcting coefficient；KTIndicate temperature correction facotor；α
Indicate instrument coefficient；ε indicates the coefficient of expansion, calculates to 9 or more after decimal point；D indicates the bore of standard meter apparatus, and unit is
m；ρaIndicate standard air situation lower density, unit is kg/m3；ΔhH2OIndicate differential pressure value, unit is mmH2O；δ indicates that gravity adds
Speed and δ=9.8m/s2, above parameter needs measure and calculate.
Gas source series based on blower forms normal stream volume production mechanism of qi tool part, and the standard scale is located at fluid hose
The front end of device, standard scale include uniform air flow generator and instrument of tracing to the source, and the front port of uniform air flow generator is wide-mouth, after
Port is circular port, and front port is connected to form airflow channel with rear port, and the conduit wall of airflow channel is according to Wei Xinsiji song
Line or Bernoulli's lemniscate curve shrinkage, uniform air flow generator is for generating uniform air flow；Uniform air flow generator side wall
Pressure tappings are equipped with, the pressure tappings are capable of providing the differential pressure signal relative to atmospheric pressure and are converted into the telecommunications of 4~20mA
Number, pressure tappings connect instrument of tracing to the source；The rear port of uniform air flow generator is sequentially communicated upstream tube, checklist, downstream tube and wind
Machine, the checklist and console of tracing to the source are all connected with detection control apparatus, and detection control apparatus connects frequency changing regulating speed control apparatus,
Frequency changing regulating speed control apparatus is also electrically connected with blower and controls the revolving speed of blower.
Further, the caliber of the upstream tube is φ 300mm~φ 2000mm, and the length of upstream tube is equal to its caliber
10 times.
Further, the caliber of the downstream tube is φ 300mm~φ 2000mm, and the length of downstream tube is equal to its caliber
5 times.
In order to meet the gas flow measurement standard of multiple caliber and compare, the caliber of upstream tube and downstream tube can be in range
It is chosen according to demand in value.
Further, the flow channels bore of the upstream tube, checklist, downstream tube and blower is identical, and uniform gas
Flow-generator, upstream tube, checklist, downstream tube and blower coaxial communication.The benefit being arranged in this way is that the stabilization of air-flow can be improved
Property, local eddy currents are avoided the occurrence of, guarantee the stability of airflow field.Said flow channel is finished by numerically-controlled machine tool, is used
The materials such as alloy aluminum or stainless steel are made.
Further, the sensor includes that barometric pressure sensor, differential pressure pickup, temperature sensor and humidity pass
Sensor.The effect of sensor is the flow parameter incuded under work condition state, and parameter information is sent out in the form of sensor signal
Send to detection control apparatus, when the parameter of the detection parameters of checklist and sensor signal detection is very close, can determine whether by
The precision for examining table is higher；When the parameter of the detection parameters of checklist and sensor signal detection is quite different, can determine whether to be detected
The precision of table is not up to standard, and can directly give design parameter not up to standard, can targetedly carry out adjustment.Specifically, tracing back
Source result includes atmosphere pressure signal, and temperature signal and moisture signal etc., above-mentioned measuring signal is the magnitude under working condition, on
It states signal value to be input in detection system together with internal diameter of the pipeline, alignment settings value and fluid content, after inflow-rate of water turbine operation
Normal flow electric signal is obtained, then exports and carries out frequency control into control system, changes rotation speed of fan, obtains calibrating gas
Flowrate measurement value flowing.
Further, the blower is axial fan, and the air velocity distribution axial direction that axial fan generates is good, more
Stablize, viscous force is effectively avoided to influence and destroy caused by gas field.
Further, as a preferred solution, when the conduit wall of the airflow channel is according to Bernoulli's lemniscate
When contraction, the trend of conduit wall meets equation ρ2=a2The ratio of cos2 θ, wherein a=0.65, θ=0~45 °, α and D are 0.6
~0.8,0.8 can be greater than when necessary；The trend of airflow channel meets the curve shape of party's formula composition, adopts in practical solution
What is taken is a part of curve therein, and front end wide-mouth, the shape that rear end is closed up is presented in airflow channel after final molding.It is arranged in this way
Meaning be, can be drained from multiple directions such as top to bottom, left and right, front and rear, air-flow is introduced into airflow channel, not destroy air-flow
Stability.The tube wall shape of uniform air flow generator is preferred plan using lemniscate type, can also be according to other in contraction-like
Full curve is designed, and is placed at the front end of flow channels.
Further, in order to better ensure that the stability of air velocity distribution, on the caliber of the upstream tube and downstream tube
Deviation is+0.03mm, and lower deviation is -0.03mm.
Further, in order to reduce the viscous force in air velocity distribution, avoid the generation of local eddy currents, the upstream tube and
The inner tubal wall of downstream tube passes through polishing grinding, makes the resistance coefficient of inner tubal wall less than 0.06, air-flow by when the resistance that generates
Power is small.
Further, the detection control apparatus includes computer, display and printer, and the checklist is shown
Show that device and printer are connected respectively to computer.Computer is used to carry out sensor signal reception and analysis, and to tested
Table is detected and is generated detection parameters, and for intuitively showing the testing result of computer, printer can be used for printing display
Testing result.
In the present invention, frequency changing regulating speed control apparatus is according to the testing result of detection control apparatus, according to temperature change, big
The factors such as atmospheric pressure variation, humidity variation, carry out PID adjusting, adjust revolving speed and provide accurate mass flow magnitude.
In the present invention, safeguard protection and Anti-interference Design are additionally provided in the motor feed circuit.
The invention has the benefit that
1. the present invention includes standard meter apparatus, upstream tube, checklist, downstream tube and motor, structure is simple, easy to use,
It realizes and is easy, and measurement accuracy is high, stability is good.
2. standard meter apparatus disclosed in the present invention includes uniform air flow generator, the structure energy of the uniform air flow generator
It is enough that air-flow is drained from multiple angles, and realize the stabilization of air velocity distribution, it can be generated in uniform air flow generator fast
Speed, unresisted air velocity distribution has positive effect to the detection precision for improving checklist.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings only shows section Example of the invention, therefore is not to be taken as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is building block schematic diagram of the invention.
In figure: 1- uniform air flow generator；101- pressure tappings；2- upstream tube；3- checklist；4- downstream tube；5- blower；6-
It traces to the source instrument；7- detection control apparatus；8- frequency changing regulating speed control apparatus.
Specific embodiment
With reference to the accompanying drawing and specific embodiment does further explaination to the present invention.
Embodiment:
As shown in Figure 1, present embodiment discloses a kind of direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER, including it is single
Standard meter apparatus；The bore range of the single standard meter apparatus is 300mm-2000mm；Gas in the single standard meter apparatus
Body flow velocity >=40m/s；The uncertainty of the standard meter apparatus is 0.3%-0.5%；The standard meter apparatus it is whole directly to
Normal flow out；The normal flow is calculated by the following formula:
Wherein, mIt is realIndicate normal flow, unit kg/h；KPIndicate pressure correcting coefficient；KTIndicate temperature correction facotor；α
Indicate instrument coefficient；ε indicates the coefficient of expansion, calculates to 9 or more after decimal point；D indicates the bore of standard meter apparatus, and unit is
m；ρaIndicate standard air situation lower density, unit is kg/m3；ΔhH2OIndicate differential pressure value, unit is mmH2O, δ indicate that gravity adds
Speed and δ=9.8m/s2, the above parameter, which needs to count, to be marked and measures.
The standard scale includes uniform air flow generator 1 and instrument 6 of tracing to the source, and the front port of uniform air flow generator is wide
Mouthful, rear port is circular port, and front port is connected to form airflow channel with rear port, and the conduit wall of airflow channel is according to Wei Xinsi
Base curves or Bernoulli's lemniscate curve shrinkage；Uniform air flow generator side wall is equipped with pressure tappings 101, the pressure tappings energy
Enough differential pressure signals provided relative to atmospheric pressure, pressure tappings connect instrument of tracing to the source；The rear port of uniform air flow generator is successively
It is connected to upstream tube 2, checklist 3, downstream tube 4 and blower 5, the checklist and instrument of tracing to the source are all connected with detection control apparatus 7, examine
It surveys control device and connects frequency changing regulating speed control apparatus 8, frequency changing regulating speed control apparatus is also electrically connected with blower and controls turning for blower
Speed.
In the present embodiment, the caliber of the upstream tube is φ 750mm, and the length of upstream tube is equal to 10 times of its caliber
That is 7.5m.
Meanwhile it is corresponding with upstream tube, the caliber of the downstream tube is φ 750mm, and the length of downstream tube is equal to its pipe
5 times of diameter are 3.75m.
In order to meet the gas flow measurement standard of multiple caliber and compare, the caliber of upstream tube and downstream tube can be in range
It is chosen according to demand in value, except the preferred embodiment in the present embodiment, there are also more other preferred values can be used.
The upstream tube, checklist, downstream tube are identical with the flow channels bore of blower, and uniform air flow generator,
Upstream tube, checklist, downstream tube and blower coaxial communication.The benefit being arranged in this way is that the stability of air-flow can be improved, and is avoided out
Current situation bilge vortex guarantees the stability of airflow field.
The sensor includes barometric pressure sensor, differential pressure pickup, temperature sensor and humidity sensor.Sensing
The effect of device is the flow parameter incuded under work condition state, and parameter information is sent to detection control in the form of sensor signal
Device processed can determine whether the precision of checklist when the parameter of the detection parameters of checklist and sensor signal detection is very close
It is higher；When the parameter of the detection parameters of checklist and sensor signal detection is quite different, the precision of checklist can determine whether not
It is up to standard, and design parameter not up to standard can be directly given, it can targetedly carry out adjustment.
The blower is axial fan, and the air velocity distribution axial direction that axial fan generates is good, more stable, effectively
Viscous force is avoided to influence and destroy caused by gas field.
As a preferred solution, when the conduit wall of the airflow channel is shunk according to Bernoulli's lemniscate, lead to
The trend of road wall meets equation ρ2=a2Cos2 θ, wherein a=0.65, θ=0~45 °.What is taken in practical solution is wherein
A part of curve, front end wide-mouth, the shape that rear end is closed up is presented in airflow channel after final molding.The meaning being arranged in this way exists
In can be drained from multiple directions such as top to bottom, left and right, front and rear, air-flow is introduced airflow channel, forms stable flow field.
The deformation of the calculation equation is:
As θ=0, ρ=a；When θ=45 °, ρ=0, its curvature equation is:
It can be seen that lemniscate Curvature varying is gentle, curvature is equal to zero when θ=45 °.In this point, curve can be smooth
Be transitioned into straight line.
In order to better ensure that the stability of air velocity distribution, the caliber upper deviation of the upstream tube and downstream tube is+
0.03mm, lower deviation are -0.03mm.
In order to reduce the viscous force in air velocity distribution, the generation of local eddy currents is avoided, the upstream tube and downstream tube
Inner tubal wall passes through polishing grinding, makes the resistance coefficient of inner tubal wall less than 0.06, air-flow by when the resistance that generates it is small.
The detection control apparatus includes computer, display and printer, the checklist, display and printing
Machine is connected respectively to computer.Computer is used to carry out reception and analysis to sensor signal, and detects to checklist
And detection parameters are produced, for intuitively showing the testing result of computer, printer can be used for printing testing result display.
In the present invention, the frequency changing regulating speed control apparatus is according to the testing result of detection control apparatus, according to temperature
The factors such as variation, atmospheric pressure change, humidity variation carry out PID adjusting (ratio proportion, integral integral, differential
Differential), adjust revolving speed and provide accurate mass flow scale of construction value.
In the present invention, safeguard protection and Anti-interference Design are additionally provided in the motor feed circuit.
The composed structure and connection relationship of the standard set-up in the present embodiment are illustrated and are explained above, now in conjunction with
It is described above that the specific works effect of the standard set-up is illustrated.
In principle, this standard device is guidance with rope flow theory, carries out meter mark using boundary-layer flow meter mark mode；It is inciting somebody to action
When theory is applied to practical, the scheme of use is to connect uniform air flow generator in the front end of upstream tube, incoming flow is become uniform
Air-flow output, meet the condition of boundary-layer flow rate calculation.
In the duct because there are viscous force, the different flow region of two attributes there is in flow field, be close to object table
One layer of sake in face, flow velocity are lower than U0And the vortex flow of viscous fluid is done, become boundary-layer.Other than boundary-layer edge, stream
Body does the irrotational motion of perfect fluid, and speed keeps original potential barrier speed, referred to as potential barrier area.In practical calculating, to determine attached
Boundary between surface layer and potential barrier area is difficult, and speed is generally equal to 0.99U thus0Locate the boundary as two sections, U0For
Not by the speed of viscous effects.
Boundary-layer is formed in fluid pipe end, and atmosphere sucks the incoming flow as end, and this structure type becomes flat
Air inlet, atmosphere are pooled to end from six direction, and there are many vortex, and the maximum value of the coefficient of outflow is 0.55, using boundary-layer
It is uniform air flow that principle mandates, which flow into end, this just needs atmosphere incoming flow to be transformed into the uniform air flow not being lost, and realizes this
The method of a transformation is the installation uniform air flow generator before end, atmosphere is carried out conductance flows into end at uniform air flow to make its stream
Coefficient is greater than 0.97 out.
Under the action of blower, inspiratory flow is generated in upstream tube, downstream tube, is selected in uniform air flow generator straight-tube portion
Position of opening is up to flow signal.
The uniform gas generator that lemniscate type is used in the present embodiment, can produce the stabilization wind field of high quality, in the wind
The flow signal measured in is stable, reproducible and precision is high.The inlet area of uniform gas generator is big, outlet and upstream
The sectional area of pipe is identical, and whole in contraction-like, air-flow flow process is the process constantly shunk, and air-flow becomes after shrinking
At uniform air flow, the ratio between inlet area and discharge area are known as shrinkage ratio, and ratio is bigger, and the uniformity of air-flow is higher, general next
It says, the value of shrinkage ratio is both greater than 4.
The embodiment of base in this present embodiment, following table give the experiment number carried out after multiple groups practical operation case
According to:
In upper table, the data on flows of band " " indicates the flow value in 25m/s.
Using the flow of 1200 standard set-up of boundary-layer principle meter mark φ, specifying information is as follows:
The present invention is not limited to above-mentioned optional embodiment, anyone can show that other are each under the inspiration of the present invention
The product of kind form.Above-mentioned specific embodiment should not be understood the limitation of pairs of protection scope of the present invention, protection of the invention
Range should be subject to be defined in claims, and specification can be used for interpreting the claims.
Claims (10)
1. a kind of direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER, it is characterised in that: including single standard meter apparatus；It is described
The bore range of single standard meter apparatus is φ 300mm- φ 2000mm；Gas flow rate >=40m/ in the single standard meter apparatus
s；The uncertainty of the standard meter apparatus is 0.3%-0.5%；The standard meter apparatus integrally directly gives normal flow, institute
State normal flow >=2.4 ╳ 105m3/h；The normal flow is calculated by the following formula:
Wherein, mIt is realIndicate normal flow, unit kg/h；KPIndicate pressure correcting coefficient；KTIndicate temperature correction facotor；α is indicated
Instrument coefficient；ε indicates the coefficient of expansion, calculates to 9 or more after decimal point；D indicates the bore of standard meter apparatus, unit m；ρa
Indicate standard air situation lower density, unit is kg/m3；ΔhH2OIndicate differential pressure value, unit is mmH2O；δ indicates acceleration of gravity
And δ=9.8m/s2；
The standard scale includes uniform air flow generator (1) and instrument of tracing to the source (6), and the uniform air flow generator is capable of providing
Uniform air flow；The front port of uniform air flow generator is wide-mouth, and rear port is circular port, and front port is connected to be formed with rear port
Airflow channel, the conduit wall of airflow channel is according to Wei Xinsi base curves or Bernoulli's lemniscate curve shrinkage；Uniform air flow hair
Raw device side wall is equipped with pressure tappings (101), and the pressure tappings are capable of providing the differential pressure signal relative to atmospheric pressure, and pressure tappings connect
Connect instrument of tracing to the source；The rear port of uniform air flow generator is sequentially communicated upstream tube (2), checklist (3), downstream tube (4) and blower
(5), the checklist and instrument of tracing to the source are all connected with detection control apparatus, and detection control apparatus (7) connects variable frequency regulating speed control dress
It sets (8), frequency changing regulating speed control apparatus is also electrically connected with blower and controls the revolving speed of blower.
2. direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER according to claim 1, it is characterised in that: described is upper
The caliber of play pipe is φ 300mm~φ 2000mm.
3. direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER according to claim 1, it is characterised in that: under described
The caliber of play pipe is φ 300mm~φ 2000mm, and the length of downstream tube is equal to 5 times of its caliber.
4. described in any item direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETERs, feature exist according to claim 1~3
In: the upstream tube, checklist, downstream tube are identical with the flow channels bore of blower, and uniform air flow generator, upstream
Pipe, checklist, downstream tube and blower coaxial communication.
5. direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER according to claim 1, it is characterised in that: described traces back
Source instrument includes barometric pressure sensor, differential pressure pickup, temperature sensor and humidity sensor.
6. direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER according to claim 1, it is characterised in that: the wind
Machine is axial fan.
7. direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER according to claim 1, it is characterised in that: the gas
When the conduit wall of circulation road is shunk according to Bernoulli's lemniscate, the trend of conduit wall meets equation ρ2=a2Cos2 θ, wherein a=
0.65, θ=0~45 °.
8. direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER according to claim 1, it is characterised in that: described is upper
The caliber upper deviation of play pipe and downstream tube is+0.03mm, and lower deviation is -0.03mm.
9. direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER according to claim 1, it is characterised in that: described is upper
The inner tubal wall resistance coefficient of play pipe and downstream tube is less than 0.06.
10. direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER according to claim 1, it is characterised in that: described
Detection control apparatus includes computer, display and printer, and the checklist, display and printer are connected respectively to meter
Calculation machine.
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| CN201910032885.6A CN109520595A (en) | 2019-01-14 | 2019-01-14 | A kind of direct corrector CALIBRATING DEVICE FOR LARGE DIAMETER GAS FLOWMETER |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2738024C1 (en) * | 2020-05-12 | 2020-12-07 | Общество с ограниченной ответственностью "ГАЗПРОМ ТРАНСГАЗ МОСКВА" | Method of transmitting volumetric flow rate unit of gas with given accuracy values from standard measurement device to working medium of measuring larger diameter on working medium with confirmation of metrological characteristics of working measuring means by comparison using comparator |
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2019
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| CN102116667A (en) * | 2011-01-14 | 2011-07-06 | 重庆工业自动化仪表研究所 | Large-aperture gas flow calibration device capable of providing two flow fields |
| CN102494742A (en) * | 2011-12-02 | 2012-06-13 | 北京航空航天大学 | Method for on-line calibration of large-caliber flow meter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2738024C1 (en) * | 2020-05-12 | 2020-12-07 | Общество с ограниченной ответственностью "ГАЗПРОМ ТРАНСГАЗ МОСКВА" | Method of transmitting volumetric flow rate unit of gas with given accuracy values from standard measurement device to working medium of measuring larger diameter on working medium with confirmation of metrological characteristics of working measuring means by comparison using comparator |
| RU2738024C9 (en) * | 2020-05-12 | 2021-02-04 | Общество с ограниченной ответственностью "ГАЗПРОМ ТРАНСГАЗ МОСКВА" | Method of transmitting volumetric flow rate unit of gas with given accuracy values from standard measurement device to working medium of measuring larger diameter on working medium with confirmation of metrological characteristics of working measuring means by comparison using comparator |
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