CN205898214U - But online calibration's gas spouts fast pipe flow measuring device - Google Patents
But online calibration's gas spouts fast pipe flow measuring device Download PDFInfo
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- CN205898214U CN205898214U CN201620565829.0U CN201620565829U CN205898214U CN 205898214 U CN205898214 U CN 205898214U CN 201620565829 U CN201620565829 U CN 201620565829U CN 205898214 U CN205898214 U CN 205898214U
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- spray
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- fast pipe
- pipeline section
- gas
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Abstract
The utility model relates to a but online calibration's gas spouts fast pipe flow measuring device, it includes: the pipeline section, it is used for gaseous circulation, spout fast pipe, it is put by the installation in the pipeline section, it has first port and second port to spout fast pipe, differential pressure transmitter, its measurement spout the first port of fast pipe and the pressure differential between the second port, its characterized in that: be provided with the transparent window on the pipeline section, the projection of transparent window on the pipe wall covers spout the projection of second port on the pipe wall of fast pipe, the pipeline section outside is provided with laser doppler current meter, the laser that doppler's current meter sent sees through the transparent window, it is right the flow that spouts the second port department of fast pipe is measured. The utility model discloses a spout fast pipe flow measuring device reliable operation, it is accurate to measure, and the calibration steps flow is clear, convenient operation.
Description
Technical field
This utility model is related to a kind of fast pipe flow measuring device of gas spray, and more particularly, to one kind is based on laser-Doppler stream
Fast instrument carries out the spray speed pipe flow measuring device of on-line calibration to flow.
Background technology
Gas flow measurement has extensive demand and application in fields such as the energy, environment, manufactures.Storage as natural gas
Transport, the discharge of power plant combustion waste gas, air-supply of steel mill's blast furnace steel-making etc., it is required for gas flow is measured.Gas stream
Gauge species is many, including turbine flowmeter, ultrasonic flowmeter, differential pressure flowmeter etc..Effusion meter need to be carried out week when using
Phase property is calibrated, and could obtain accurate measurement result, meets the requirement of live flow measurement.In existing calibration mode and condition
Under, effusion meter need to be dismantled from measurement pipeline by user, transports to the flow detection laboratory having rated capacity, in flow standard
Calibrated on device.After completing calibration, effusion meter is returned to user, can carry out flow measurement after reinstalling debugging.
Different field industry is very big to gas flow measurement demand difference.First, tested gas medium species is many, and gas is situated between
The difference of matter physical parameter can affect certainty of measurement.Secondly, the pressure of live flow measurement and range of flow width, needs different former
Reason, the effusion meter of different bores meets measurement demand.Additionally, the mounting condition at flow measurement scene is complicated, use environment is various,
Cause difficulty all to accurate measurement.This difficulty requires to possess perfect calibration for the flow standard device of flow meter calibrating
Function, calibrates to different effusion meters under various conditions, is only possible to ensure the reliable effective of field measurement data.But
Flow standard device construction land area is big, manufactures operating cost height, and energy consumption is many, is white elephant for a user.Additionally,
Certain customers are in order to complete calibration it has to stop producing, and removing and installing with traffic flow gauge is also high expenditure, and this is all
Cause the loss of economic benefit.
Based on the problems referred to above, the effusion meter possessing on-line calibration function is considered as effective way and the work of solve problem
Tool.However, existing gas flowmeter is all difficult to flow on-line calibration in fact at present.
Content of the invention
The purpose of this utility model is to solve the problems, such as gas flowmeter reality stream on-line calibration it is proposed that a kind of being based on is swashed
Light doppler velocimeter (ldv) can on-line calibration spray speed pipe flow measuring device, for gas flow in closed conduct
Measurement.
The utility model discloses a kind of based on Doppler laser velocimeter (ldv) can on-line calibration spray speed pipe flow amount
Measurement apparatus, for the measurement of gas flow in closed conduct.Wherein, Doppler laser velocimeter can measure the fast pipe exit of spray
Flow field velocity and distribution, by integrate flow field speed obtain flow, this flow is defined as normal flow.By comparing mark
The quasi- flow nominal flow capacity that fast pipe flow measuring device obtains with spray, calculates the calibration factor of the fast pipe flow measuring device of spray, real
The on-line calibration of existing measurement apparatus.The fast pipe flow measuring device reliable operation of spray, measurement is accurate, calibration steps clear process, behaviour
Facilitate.
Of the present utility model based on Doppler laser velocimeter (ldv) can on-line calibration spray speed pipe flow measuring mass flow
Device；Effusion meter may be installed in closed conduct, the state parameter such as measurement differential pressure under certain flow.Based on effusion meter inner chamber
The design in type face, the flow velocity of jet flow field core space is evenly distributed.Boundary region stably can be surveyed.
This utility model provide a kind of can on-line calibration the fast pipe flow measuring device of gas spray, comprising: pipeline section, its
Circulation for gas；Spray speed pipe, it is installed in described pipeline section, and described spray speed pipe has first port and second port；
Differential pressure transmitter, the pressure differential between the first port of the fast pipe of the described spray of its measurement and second port；Described pipeline section is arranged
There is transparent window, described transparent window covers the projection on tube wall of the second port of the fast pipe of described spray in the projection on tube wall；
It is provided with Doppler laser velocimeter outside described pipeline section, described in the laser light that described Doppler laser velocimeter sends thoroughly
Photopic vision window, measures to the flow at the second port of the fast pipe of described spray.
Wherein, described pipeline section is at least two, and is connected with each other.
Wherein, the side wall of described pipeline section is provided with pressure transmitter.
Wherein, described pressure transmitter is near the first port of the fast pipe of described spray.
Wherein, described transparent window is double-layer sealing structure.
Wherein, the diameter range of described pipeline section is 3～3000mm.
Wherein, the diameter with diameter greater than described second port of the first port of described spray speed pipe.
Wherein, described pipeline section is generally circular in shape, any group of one of the shape such as rectangle, polygon or above-mentioned shape
Close.
Of the present utility model provide a kind of on-line calibration method Ji Yu Doppler laser velocimeter (ldv).Through peace
It is contained in the transparent window on effusion meter, Doppler laser velocimeter (ldv) can achieve the measurement of stream field VELOCITY DISTRIBUTION.Flow leads to
The rate integrating crossing flow field each point obtains.Wherein, the design spraying fast tube cavity curved surface can achieve certain differential pressure Fluid field core space
Being uniformly distributed of speed, the effective control of achievable boundary layer thickness.Wherein, spray the shrinkage ratio scope of fast pipe from 3: 1～9: 1.
Wherein, the position spraying fast pipe flow measuring device differential pressure measurement selection is computed selection after design, can obtain accurate under present flow rate
Really stable differential pressure value.Wherein, when spraying fast cell measurement apparatus calibration, transparent window need to be installed.Rely on the double-layer seal of device itself
Mechanism, transparent window can achieve online (not stopping) installing/dismounting.Wherein, by filling certain density trace particle, can be real
The existing measurement to gas flow rate for the Doppler laser velocimeter (ldv).
The advantage of the method is: achievable on-line calibration it is not necessary to calibration when dismounting or reinstall effusion meter it is not necessary to
The gas of flowing in shutoff or pipeline of stopping.
Brief description
The fast pipe flow measuring device structural representation of Fig. 1 spray.
Specific embodiment
For the ease of understanding this utility model, below in conjunction with the accompanying drawings embodiment of the present utility model is illustrated, ability
Field technique personnel should be appreciated that following explanations only to facilitate explaining to utility model, and not as to its scope
Concrete restriction.
Fig. 1 show the fast pipe flow measuring device structural representation of spray of the present utility model.Described measurement apparatus include
One pipeline section 1, the second pipeline section 10 and the 3rd pipeline section 9, wherein, are bolted between the first pipeline section 1 and the second pipeline section 10, described
Bolt connection may also be employed, described first pipeline section 1, the second pipeline section 10 and the 3rd pipeline section 9 between second pipeline section 10 and the 3rd pipeline section 9
Between not only by bolt connection it is also possible to be attached by other connected modes.
The direction of arrow as shown in Figure 1 is the flow direction of the gas in described measurement apparatus, in described first pipeline section 1
Pressure transmitter 3 is provided with the wall of side, described pressure transmitter 3 can provide the pressure of the gas offside wall in pipeline, so-called
Pressure transmitter is that the mechanical signal of pressure is transformed into current signal, wherein, the voltage in pressure and electronic signal or electric current
Size is linear, calculates the size of pressure according to electronic signal.
In the junction of the first pipeline section 1 and the second pipeline section 10, it is connected with the fast pipe 5 of spray further, described spray speed pipe 5 is by stainless
Steel or other high-strength materials are made, and described spray speed pipe 5 has first port and second port, and is located at described first port
Arc tube wall and second port between；Have in the first port of described spray speed pipe 5 and outward extend flange, preferably described
Multiple through holes are had on flange, in the both sides of described flange, there is annular groove, circle can be set in the annular groove of two
Valve rubber, the bolt that the first pipeline section 1 and the second pipeline section 10 are linked together passes through logical on the flange of described first port
Hole, fast for described spray pipe 5 is fixed between the first pipeline section 1 and the second pipeline section 10, two valve rubbers respectively with the first pipeline section 1 and the
Two pipeline sections 10 coordinate the sealing of real junction.As further preferably, described spray speed pipe 5 can be connected by way of flange
It is connected between the first pipeline section 1 and the second pipeline section 10.
The bore scope of the pipeline that described first pipeline section 1, the second pipeline section 10 and the 3rd pipeline section 9 are formed is in 3～3000mm；
Described pipe shape is round pipe, the combination in any of one of shape such as rectangular duct, polygonal shape tubes or above-mentioned pipeline；
Described pipeline can be for being horizontally mounted, and vertically-mounted or inclination is installed.
The diameter with diameter greater than described second port of the first port of the fast pipe 5 of described spray, the diameter of first port is to the
Two-port netwerk direction is gradually reduced, and the mode of reduction is to shrink according to the camber line mode of the tube wall of the fast pipe of spray, the interior table of described tube wall
Face and outer surface are curved form, and the cavity inner surface by the fast pipe 5 of spray is that the design of curved surface can achieve certain differential pressure Fluid field
Being uniformly distributed of core space speed, the effective control of achievable boundary layer thickness.The first port of the fast pipe 5 of described spray is with respect to the
Two-port netwerk has certain shrinkage ratio, and wherein, spray fast pipe is punctured into 3: 1, and the diameter of first port is second port diameter
Three times, improve as further, reduce the diameter of described second port further, shrinkage ratio is changed into 5: 1, be i.e. first port
Diameter is five times of second port；As further preferred, reduce the diameter of described second port, shrinkage ratio is changed into 9: 1, make
It is 3: 1～9: 1 for the scope improving described shrinkage ratio of the present utility model, certainly according to specific pipeline needs, can be to receipts
Contracting ratio is configured, and is not limited between 3: 1～9: 1, and the scope of its shrinkage ratio can be less than 3: 1, in addition, the scope of shrinkage ratio
9: 1 can also be more than.
It is provided with differential pressure transporting between the installation site and the second port of described spray speed pipe 5 of described pressure transmitter 3
Device 4, can obtain the pressure differential between the first pipeline section 1 and the second port of the fast pipe 5 of spray by described differential pressure transmitter 4, thus
By calculating the uninterrupted obtaining in pipeline section.
Scattering particless adder 2 is had on described first pipeline section 1, described scattering particless adder 2 has positioned at first
Interpolation port in pipeline section 1, particle is scattered out from described interpolation port, thus being diffused in the first pipeline section 1, from spray speed pipe
5 first port enters, and sprays, in described second pipeline section 10 from the second port positioned at the fast pipe 5 of the spray the second pipeline section 10
On there is transparent window 8, pipe 5 projection on the tube wall of second pipeline section 10 fast with spray of described transparent window 8 has overlapping portion
Point, thus the scope of described transparent window 8 covers the second port of the fast pipe 5 of described spray, throwing on tube wall for the described transparent window
Projection on tube wall for the second port of the fast pipe of the described spray of shadow covering, the scattering of ejection from the second port of described spray fast pipe 5
Particle can be observed by described transparent window 8.It is added in the gas in described first pipeline section 1, the scattering grain of generation
Son flows at transparent window through the fast pipe of spray with gas.Wherein, during described spray speed cell measurement apparatus calibration, transparent window need to be installed.
Rely on the double-layer seal mechanism of device itself, transparent window can achieve online (not stopping) installing/dismounting.
For the ease of the safe operation of pipeline, the pipeline in position for the described transparent window 8 adopts double-layer sealing structure form,
In pipeline normal work at ordinary times, using metal or other sealing structure form, two-layer sealing structure is in sealing state,
Not there are gas flow between described two-layer sealing structure, before being ready for calibration, by outermost layer sealing structure more
Change transparent window 8 into, described transparent window 8 preferably can adopt the quartz glass of high permeability make, when completing transparent window 8
After replacing, the internal layer sealing structure in described two-layer sealing structure is opened, it is preferred to use autocontrol valve or other are controllable
Mode opened.
Also include temperature sensor 7 in described second pipeline section 10, described temperature sensor 7 is used for measuring described second
The temperature of the gas in pipeline section 10.
It is provided with Doppler laser velocimeter 6 outside the pipeline of the second pipeline section 10, described Doppler laser velocimeter 6 is surveyed
The velocity flow profile in fast pipe 5 exit of amount spray, is integrated to velocity flow profile calculating, and obtains flowing through the actual flow of the fast pipe of spray.
In this utility model, flow is by a flow velocity, the integration of jet area to be obtained.Can accurate measurement point stream
Speed is to realize the key of flow measurement.This utility model measures each point flow velocity in jet flow field by Doppler laser velocimeter 6.
The metering system of Doppler laser velocimeter 6 is non-cpntact measurement, it is to avoid destruction to jet flow field, will not form obstruction effect
Should, the spatial resolution of its measurement is higher, about 2mm3Left and right.Specific measuring principle is as follows:
As shown in figure 1, being located at the scattering particless adder 2 of described first pipeline section 1 to the interpolation scattering grain in the first pipeline section 1
Son, described scattering particless spray from the second port of the fast pipe 5 of described spray, described in the laser light of Doppler laser velocimeter 6
Transparent window 8, is radiated at the near exit of the second port of the fast pipe 5 of described spray, and Doppler laser velocimeter 6 is using being spread out over gas
In body, the Doppler frequency shift of the scattered light of servo-actuated microgranule obtains the speed of gas.Specifically, described Doppler laser velocimeter 6
Using dual-beam pattern, send the relevant Gauss light of two bundles from described Doppler laser velocimeter 6, described Gauss light is in space phase
Hand over, form measurement body in intersecting region, in measurement body, form light and dark interference fringe.When the scattering particless following fluid
During measured body, there is relation in the Doppler frequency of the light intensity signal of KPT Scatter and the movement velocity of particle:
Wherein, λ is the wavelength of launching light, and θ is the angle of two bundle coherent lights, and f is Doppler frequency.In formula (1),Characterize the spacing of interference fringe in measurement body, f characterizes the transition time that scattering particless pass through measurement body, vldaFor
The point flow velocity that laser Doppler measuring obtains.Formula (1) shows: the certainty of measurement of Doppler frequency f and fringe spacing determines sharp
The certainty of measurement of light doppler velocimeter ldv., after accurate calibration, the certainty of measurement of point flow velocity is permissible for Doppler laser velocimeter
Reach 0.2% rate accuracy.
The calibration process of the fast pipe flow measuring device of spray: when the gas in pipeline flows through the fast pipe 5 of spray, due to the fast pipe 5 of spray
Contraction throttling, certain differential pressure can be produced in fast pipe 5 both sides of spray.There is quantitative relationship with the flow flowing through the fast pipe 5 of spray in differential pressure.
If realize spray speed management is thought the correction of measurement model by traffic alignment, that is, the quantitation of accurate quantification differential pressure and flow is closed
System is it is possible to accurately measure gas flow with the fast cell measurement apparatus of spray.By applying the fast pipe 5 of Doppler laser velocimeter measurement spray
The exit of second port flow field velocity distribution, and then stream field VELOCITY DISTRIBUTION is integrated, and can obtain jet volume
Flow.Because the jet at spout outlet maintains good seriality, therefore laser-Doppler with the flowing in upstream line
The jet flow that current meter 6 measurement obtains is the flow in pipeline.Using jet flow as normal flow, fast pipe 5 is surveyed with spray
The nominal flow capacity obtaining compares, you can realize the calibration of the fast cell measurement apparatus of spray it is determined that differential pressure sprays determining of fast pipe flow amount with flowing through
Magnitude relation.The normal flow q that Doppler laser velocimeter measurement obtainssCan be obtained by formula (2):
qs=∫ vldada (2)
Wherein, vldaThe point flow velocity obtaining for laser Doppler measuring.
On-line calibration process: as shown in Figure 1: the fast pipe flow measuring device of spray is arranged on appendix in the way of flange connection
In road.The absolute pressure of gas is recorded by spraying fast pipe upstream line pressure, simultaneously in the exit of the second port of the fast pipe 5 of spray
Pressure in an annular manner, records the differential pressure at the fast pipe two ends of spray.The temperature of gas is by the temperature sensing being arranged on the fast pipe exit of spray
Device 7 records.At the second port of the fast pipe 5 of spray, the interior cross-sectional area of outlet can record, in a pre-installation when the gas in pipeline flows through
During the fast flowmeter for pipe of spray, the absolute pressure of measurement gas, the differential pressure of the fast pipe of spray, the temperature of gas, spray speed pipe can be calculated and work as
Front nominal flow capacity, nominal flow capacity qiCan be obtained by formula (3):
Wherein, cdThe efflux coefficient of the fast pipe of spray, characterizes the VELOCITY DISTRIBUTION of jet flow field and boundary region in integrating flow
Revise；A is the area of spray fast pipe outlet；δ p is the differential pressure at subsonic speed spout two ends；ρ is the density of Jetstream fluid.
This utility model passes through to install scattering particless adder in measurement apparatus upstream, and the scattering particless of generation are with gas warp
The fast pipe of spray flows at transparent window.By the velocity flow profile in the fast pipe exit of Doppler laser velocimeter measurement spray, flow velocity is divided
Cloth is integrated calculating, and obtains flowing through the actual flow of the fast pipe of spray.Nominal flow capacity and actual flow is set up under different flows
Quantitative relationship, you can realize the on-line calibration to the fast pipe flow measuring device of spray.The outflow of fast pipe can be sprayed by formula (2), (3)
Coefficient.
Obtain spraying the efflux coefficient c of fast pipe in certain range of flowdAfterwards, when measuring gas flow, measure in real time
The differential pressure at the fast pipe two ends of spray, the temperature, pressure of Gas Jet, the gas flow in pipeline can be calculated.Application laser-Doppler
To spray, fast pipe device carries out periodic calibration it is ensured that spraying the long-term Stability and veracity of fast pipe device to current meter.
Doppler laser velocimeter of the present utility model has a wide range of applications in flow-speed measurement, has accuracy height,
Non-cpntact measurement, the advantages of dynamic response is fast.
Although it is understood that this utility model is disclosed as above with preferred embodiment, but above-described embodiment is not
In order to limit this utility model.For any those of ordinary skill in the art, without departing from this utility model technical side
Under case ambit, all can be utilized the technology contents of the disclosure above that technical solutions of the utility model are made with many possible variations
And modification, or the Equivalent embodiments being revised as equivalent variations.Therefore, every content without departing from technical solutions of the utility model,
According to technical spirit of the present utility model to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belong to
In the range of technical solutions of the utility model protection.
Claims (8)
1. a kind of can on-line calibration the fast pipe flow measuring device of gas spray, comprising: pipeline section, it is used for the circulation of gas；Spray
Speed pipe, it is installed in described pipeline section, and described spray speed pipe has first port and second port；Differential pressure transmitter, its measurement
Pressure differential between the first port of described spray speed pipe and second port；It is characterized in that: it is provided with transparent on described pipeline section
Form, described transparent window covers the projection on tube wall of the second port of the fast pipe of described spray in the projection on tube wall；Described
It is provided with Doppler laser velocimeter outside pipeline section, transparent described in the laser light that described Doppler laser velocimeter sends regard
Window, measures to the flow at the second port of the fast pipe of described spray.
2. the fast pipe flow measuring device of gas as claimed in claim 1 spray it is characterised in that: described pipeline section is at least two,
And be connected with each other.
3. the fast pipe flow measuring device of gas as claimed in claim 1 spray it is characterised in that: pacify on the side wall of described pipeline section
Equipped with pressure transmitter.
4. the fast pipe flow measuring device of gas as claimed in claim 1 spray it is characterised in that: described pressure transmitter is near institute
State the first port of the fast pipe of spray.
5. the fast pipe flow measuring device of gas as claimed in claim 1 spray it is characterised in that: described transparent window is double-deck close
Seal structure.
6. the fast pipe flow measuring device of gas as claimed in claim 1 spray it is characterised in that: the diameter range of described pipeline section is
3～3000mm.
7. the fast pipe flow measuring device of gas as claimed in claim 1 spray it is characterised in that: the first port of the fast pipe of described spray
The diameter with diameter greater than described second port.
8. the fast pipe flow measuring device of gas as claimed in claim 1 spray it is characterised in that: described pipeline section generally circular in shape or
Rectangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620565829.0U CN205898214U (en) | 2016-06-12 | 2016-06-12 | But online calibration's gas spouts fast pipe flow measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620565829.0U CN205898214U (en) | 2016-06-12 | 2016-06-12 | But online calibration's gas spouts fast pipe flow measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205898214U true CN205898214U (en) | 2017-01-18 |
Family
ID=57767124
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620565829.0U Expired - Fee Related CN205898214U (en) | 2016-06-12 | 2016-06-12 | But online calibration's gas spouts fast pipe flow measuring device |
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| CN (1) | CN205898214U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865550A (en) * | 2016-06-12 | 2016-08-17 | 中国计量科学研究院 | Gas spray pipe flow measuring device capable of online calibration |
-
2016
- 2016-06-12 CN CN201620565829.0U patent/CN205898214U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865550A (en) * | 2016-06-12 | 2016-08-17 | 中国计量科学研究院 | Gas spray pipe flow measuring device capable of online calibration |
| CN105865550B (en) * | 2016-06-12 | 2021-12-07 | 中国计量科学研究院 | Gas jet velocity pipe flow measuring device capable of being calibrated on line |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170118 Termination date: 20170612 |
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| CF01 | Termination of patent right due to non-payment of annual fee |