CN107462305A - A kind of flowmeter inline diagnosis method - Google Patents
A kind of flowmeter inline diagnosis method Download PDFInfo
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- CN107462305A CN107462305A CN201710668647.5A CN201710668647A CN107462305A CN 107462305 A CN107462305 A CN 107462305A CN 201710668647 A CN201710668647 A CN 201710668647A CN 107462305 A CN107462305 A CN 107462305A
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- Prior art keywords
- flowmeter
- pressure loss
- flow
- measured
- pressure
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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
Abstract
The present invention provides a kind of flowmeter inline diagnosis method, and its step is as follows：（1）Establish the canonical function storehouse of the flowmeter of different nominal bores；（2）Before flow-meter table to be measured, Fluid pressure is obtained after table respectively, and obtains pressure loss value p'；3）And by step（2）The pressure loss value p' of middle acquisition is compared with the pressure loss value △ p read from canonical function storehouse, when it exceedes the value range of setting, then judges that the movement of the flow-meter to be measured breaks down；（4）Pass through the Radio Frequency Interfere outside the detection of the Radio frequency interference sensor that is arranged in flow-meter to be measured, and Radio Frequency Interfere is converted into data signal and compared with the threshold value of setting, carry out surrounding environment interference strength judgement, can whether inline diagnosis flowmeter movement abnormal, whether flowmeter is by extraneous radio frequency interference etc., more preferable diagnostic techniques and multifarious diagnostic method are provided, reliability is improved so as to reduce cost.
Description
Technical field
The invention belongs to fluid metering field, and in particular to a kind of flowmeter inline diagnosis side applied to fluid measurement
Method.
Background technology
Flowmeter is the instrument for measuring fluid flow in pipeline, applied in industrial process control environment, indicates quilt
The total amount of detected fluid in fluid measured flow and selected time interval.In order to adapt to multiple use, have and utilize various measurement skills
The flowmeter of art, such as turbine flowmeter, precession spiral flowmeter, volumetric flowmeter, differential pressure flowmeter.
If turbine flowmeter is the mutliblade fluid flow instrument of vane type, the flow that is measured by impeller rotation
Meter, its operation principle are：The angular velocity of rotation for the impeller being placed in fluid is directly proportional to rate of flow of fluid under condition of work, passes through survey
The angular speed of amount impeller can be obtained by rate of flow of fluid, so as to obtain the flow value in pipeline.In certain range of flow, survey
It is directly proportional to measure the instantaneous delivery Q of fluids of the pulse frequency f of impeller angular speed output to flowing through sensor, turbine flowmeter stream
Measuring equation is：
Q=f/k,
In formula:F --- pulse frequency；K --- the instrument coefficient Q of flowmeter --- instantaneous delivery of fluid
It is a kind of fluid meters such as precession spiral flowmeter category fluid oscillating type instrument.Its operation principle is：Enter inbound traffics
The fluid of meter, whirlpool is produced by eddy generator, eddy-currents precession in Venturi tube, being throttled suddenly to contraction section makes whirlpool
Stream accelerates, and after whirlpool flows into diffuser, screw type secondary rotating is carried out because backflow effect forces.The now rotary frequency of eddy-currents
Rate is directly proportional to medium flow field, by measuring the eddy-currents speed directly proportional to medium flow field, so that it may obtain the flow of fluid.Stream
Gauge formula is：
Q=f/k,
In formula:F --- vortex frequency；K --- the instrument coefficient Q of flowmeter --- instantaneous delivery of fluid
Every flowmeter instrument coefficient is filled in calibration certificate, k in the standard set-up verification by legal gauge check mechanism
Value is set in supporting correction instrument or display instrument, can show instantaneous delivery and accumulation total amount
Flowmeter is in use, and over time, the core part of flowmeter measurement damages or solid and sticky because of burn into
Liquid attachment accumulation, or air intake duct are blocked by impurity, can change the instrument coefficient k of flowmeter, influence the correct of metric results
Degree.
The metering reliability of flowmeter is also by radio-frequency radiation interference effect.
The calibration in an appropriate cycle is maintained, is a kind of method for solving metering reliability, typically flowmeter is separated
Scene, it is sent to legal gauge check mechanism and is calibrated using standard set-up.
Also a kind of known method is confirmed using double track metering contrast, passes through a calibrated accurate flow instrument of connecting
Table carries out fault recognition to operating flowmeter.
These known methods will dismantle instrument, be used to diagnose using external flow standard set-up；Or increase flow instrument
Table quantity is used for data comparison, the failure of flowmeter for confirmation.These approaches increases cost and complexity, does not carry in real time
For the diagnosis of flowmeter basic element of character situation, it is therefore necessary to more preferable diagnostic techniques and multifarious diagnostic method are provided, from
And reduce cost and improve reliability.
The content of the invention
In order to overcome the technical deficiency of the above, the present invention provides a kind of flowmeter inline diagnosis method.
The present invention provides a kind of flowmeter inline diagnosis method, and its step is as follows：
（1）The canonical function storehouse of the flowmeter of different nominal bores is established, according to some of the lower actual measurement of flow standard device calibrating
Pressure loss value △ p under individual operating mode, by pressure loss △ p and flow q, pressure P, temperature T, density p, bore DN it is related
Property：△ p=f (q, P, T, ρ, DN), establish the canonical function that flowmeter has determined type and the Calculation of pressure loss under nominal bore
Storehouse；
（2）Before flow-meter table to be measured, Fluid pressure is obtained after table respectively, and obtains pressure loss value p'；
（3）From step（1）The reference pressure penalty values △ p of current flowmeter to be measured are transferred in the canonical function storehouse of middle acquisition, and will
Step（2）The pressure loss value p' of middle acquisition compared with the reference pressure penalty values △ p transferred from canonical function storehouse,
When it exceedes the value range of setting, then judge that the movement of the flow-meter to be measured breaks down；
（4）By the Radio Frequency Interfere outside the detection of the Radio frequency interference sensor that is arranged in flow-meter to be measured, and
Radio Frequency Interfere is converted into data signal and compared with the threshold value of setting, sentenced so as to carry out surrounding environment interference strength
It is disconnected.
Step（3）Comprise the following steps：
The first step, the density parameter for obtaining flow and medium；
Second step, type, nominal bore and the tolerance ε parameters for obtaining flow-meter to be measured；
3rd step, according to the type and nominal bore parameter of the flow-meter to be measured obtained in second step from step（1）In
Function data corresponding to acquisition；
4th step, utilize the normal pressure penalty values △ p in the case of the function data acquisition current working of acquisition.
Step（1）Or step（3）In pass through p=ρ (aQv 2+bQv+ c) functional expression and p=kMQv 2（P/T）Function
Formula obtains the pressure loss value of the flow-meter under each operating mode, and p is pressure loss value in formula, and ρ is Media density, a,
B, c is multinomial coefficient, and k is pressure loss coefficient, QvFor rate-of flow, P is medium absolute pressure, and T is medium absolute temperature, and M is
The molal weight of medium.
If carry out interpolation method or curve matching by detecting the pressure loss value under dry cooling condition, and to obtaining pressure loss value
The pressure loss coefficient function library established under each bore of mode, the set of each bore condition of pressure loss coefficient function library is as step
（1）In canonical function storehouse.
Beneficial effects of the present invention：Can whether inline diagnosis flowmeter movement abnormal, whether flowmeter is done by extraneous radio frequency
Disturb, there is provided more preferable diagnostic techniques and multifarious diagnostic method, reliability is improved so as to reduce cost.
Brief description of the drawings
Fig. 1 is the structural representation that the present invention is applied to the volume correction instrument with inline diagnosis function.
Fig. 2 is the application function block diagram with flowmeter online diagnosing technique of support shaft.
Fig. 3 is that movement judges processing module FB(flow block) extremely.
Fig. 4 is that the present invention is applied to the example with inline diagnosis function flowmeter.
Fig. 5 is that the present invention is applied to the example with independent on-line diagnosing apparatus flowmeter.
Embodiment
Embodiments of the present invention is further illustrated below in conjunction with the accompanying drawings：
As shown in figure 3, the present invention provides a kind of flowmeter inline diagnosis method, its step is as follows：
（1）The canonical function storehouse of the flowmeter of different nominal bores is established, according to some of the lower actual measurement of flow standard device calibrating
Pressure loss value △ p under individual operating mode, by pressure loss △ p and flow q, pressure P, temperature T, density p, bore DN it is related
Property：△ p=f (q, P, T, ρ, DN), establish the canonical function that flowmeter has determined type and the Calculation of pressure loss under nominal bore
Storehouse；
（2）Before flow-meter table to be measured, Fluid pressure is obtained after table respectively, and obtains pressure loss value p'；
（3）From step（1）The reference pressure penalty values △ p of current flowmeter to be measured are transferred in the canonical function storehouse of middle acquisition, and will
Step（2）The pressure loss value p' of middle acquisition compared with the reference pressure penalty values △ p transferred from canonical function storehouse,
When it exceedes the value range of setting, then judge that the movement of the flow-meter to be measured breaks down；
（4）By the Radio Frequency Interfere outside the detection of the Radio frequency interference sensor that is arranged in flow-meter to be measured, and
Radio Frequency Interfere is converted into data signal and compared with the threshold value of setting, sentenced so as to carry out surrounding environment interference strength
It is disconnected.
Step（3）Comprise the following steps：
The first step, the density parameter for obtaining flow and medium；
Second step, type, nominal bore and the tolerance ε parameters for obtaining flow-meter to be measured；
3rd step, according to the type and nominal bore parameter of the flow-meter to be measured obtained in second step from step（1）In
Function data corresponding to acquisition；
4th step, utilize the pressure loss value △ p in the case of the function data acquisition current working of acquisition.
Step（1）Or step（3）In pass through p=ρ (aQv 2+bQv+ c) functional expression and p=kMQv 2（P/T）Function
Formula obtains the pressure loss value of the flow-meter under each operating mode, and p is pressure loss value in formula, and ρ is Media density, a,
B, c is multinomial coefficient, and k is pressure loss coefficient, QvFor rate-of flow, P is medium absolute pressure, and T is medium absolute temperature, and M is
The molal weight of medium.
If carry out interpolation method or curve matching by detecting the pressure loss value under dry cooling condition, and to obtaining pressure loss value
The pressure loss coefficient function library established under each bore of mode, the set of each bore condition of pressure loss coefficient function library is as step
（1）In canonical function storehouse.
Method of the invention to be combined with traditional volume correction instrument, that inline diagnosis is added using online diagnosing technique of support shaft, so as to
Reduce cost and improve reliability.As depicted in figs. 1 and 2, the volume correction instrument with diagnostic techniques includes shell 10 and can opened
The protecgulum being arranged on shell is opened, power supply 14 and circuit board 12 is provided with the shell, antenna is provided with the shell 10
18th, signal output interface 21, communication interface 15, the first signal input interface 16, secondary signal input interface 17, the circuit board
It is arranged in shell 10, is sequentially installed with differential pressure signal process circuit 7, pressure signal thereonProcess circuit 4, pressure signal
Process circuit 2, processes temperature signal circuit 1, flow signal process circuit 3, communication module 13, alarm output module 20 and micro-
Processor system 11, the circuit board 12 are provided with Radio frequency interference detection module 8, and the Radio frequency interference detection module passes through feeder line 19
It is connected with antenna 18.The Radio frequency interference detection module 8 is connected with the circuit board 12 by detection module connector 9.
The circuit board is provided with flexible connector 6, and the protecgulum is electrically connected with shell 10 by flexible connector.
Described microprocessor system 29, including movement extremely judge processing module 36, alarm signal processing module 37 with
And canonical function storehouse 38.
Described canonical function storehouse 38, it is the pressure under several operating modes according to flow standard device calibrating flowmeter actual measurement
Power penalty values, pass through the pressure loss and flow, pressure, temperature, density, the correlation of bore：△ p=f (q, P, T, ρ, DN), bag
Include and utilize curve matching and interpolation method, establish flowmeter and determined Calculation of pressure loss function data under type and nominal bore
Storehouse, the set of each bore condition in crushing design factor function data storehouse, as canonical function storehouse 38 in microprocessor system 29
Storage, memory select nonvolatile memory
Described differential pressure signal process circuit 7, input signal connect differential pressure pick-up or two-way pressure sensor, output flow meter table
Before, the pressure loss value p' after table, output signal is connected to microprocessor system 29；Movement in microprocessor system 29 is different
Often judging processing module 36, the nominal bore according to flowmeter obtains respective function data value into canonical function storehouse 38, according to
Current flow value, pressure value, temperature value and Media density, obtains the normal pressure penalty values p under the operating mode, then with actual measurement
Pressure loss value p' compares before and after flowmeter, and whether inline diagnosis flowmeter movement is abnormal.
Described flow signal process circuit 3 can receive the flow measurement signal of flowmeter, be carried out according to the type of signal
Pretreatment.Pressure signalProcess circuit 4, pressure signalProcess circuit 2 receives pressure sensor signal, is microprocessor system
System provides the integrated mode of a variety of pressure measxurements.
Radio frequency interference sensor signal processing circuit 35 is connected with microprocessor system 29, when detecting Radio Frequency Interfere
When, alarm signal processing module 37 carries out interference strength judgement, and alert and live thing is recorded when beyond predetermined value
Part.
Digital communications module 28 is connected with microprocessor system 29, by wire communication and radio communication, transmits flowmeter
The various parameters and warning message of inline diagnosis, and receive the data message of other equipment.Alarm signal export 27 modules with
Level logic state transmits alarm condition.Power module 25 provides the power supply supply of microprocessor system 33, and power module 25 is
Lithium battery.
Volume correction instrument is the volume correction instrument with inline diagnosis function using the technology of the present invention in Fig. 4（Following letter
Claim volume correction instrument 44）.In Fig. 4, temperature sensor 47 and pressure sensor 51 are arranged in flowmeter, measure the temperature of medium
Degree and pressure, temperature sensor 47 are connected by signal cable with volume correction instrument 44；Pressure sensor 51 passes through signal cable
It is connected with volume correction instrument 44, in Fig. 4, the pressure port of differential pressure pick-up is mounted with preceding straight length 41 and rear straight length 46.
Differential pressure pick-up 42 is connected with preceding straight length 41 and rear straight length 46, and output signal is connected to volume correction instrument through signal cable
44.With reference to figure 2, differential pressure sensor signal, pressure sensor signal, temperature sensor signal connect after preposition processing circuit processes
It is connected to microprocessor system 29.With reference to figure 3, movement judges 36 modules of processing extremely, and the nominal bore according to this flowmeter is to marking
The function data value under corresponding nominal bore is obtained in quasi-function storehouse 38, according to current flow value, pressure value, temperature value and Jie
Matter density, obtain the normative reference pressure loss value p under the operating mode, then the measured discharge meter with differential pressure signal process circuit 34
Front and rear pressure loss value p' compares, and deviation exceeds range of set value, that is, judges that flowmeter movement is faulty.
Fig. 5 is that the present invention is applied to another example with inline diagnosis function flowmeter, using with this hair
A kind of flowmeter on-line diagnosing apparatus 77 of bright technology is combined with conventional flow meters.Flowmeter on-line diagnosing apparatus 77 passes through signal
Cable is connected with volume correction instrument 74, and differential pressure pick-up 72, preceding straight length 71 are connected with signal cable by volume correction instrument 74
With the pressure port that differential pressure pick-up 72 is mounted with rear straight length 78.Differential pressure pick-up 72 and preceding straight length 71 or rear straight length 78
It is connected, before measuring flow instrument, the pressure after table, output signal is connected to volume correction instrument 74 through signal cable.Measurement stream
Before measuring instrument, the pressure after table, except with differential pressure pick-up, can also install two pressure sensors, respectively before measurement table, table
Pressure afterwards.Flowmeter on-line diagnosing apparatus 77 can also may be used with volume correction instrument 74 except exchanging information with signal cable connection
Data are exchanged by communication interface.
The signal of differential pressure pick-up 72, flowmeter on-line diagnosing apparatus 77 is connected to through connecting cable and volume correction instrument
In, differential pressure signal is exported to microprocessor system 29 through differential pressure signal process circuit 7.Output signal is connected to body through signal cable
Product correction instrument 74.With reference to figure 2, differential pressure sensor signal, pressure sensor signal, temperature sensor signal are through preposing signal process circuit
Microprocessor system 29 is connected to after processing.With reference to figure 3, movement judges processing module 36, the nominal according to this flowmeter extremely
Bore obtains the function data value under corresponding nominal bore into canonical function storehouse 38, according to current flow value, pressure value, temperature
Angle value and Media density, obtain the normative reference pressure loss value p under the operating mode, then the reality with differential pressure signal process circuit 7
Pressure loss value p' compares before and after flow measurement gauge, and deviation exceeds range of set value, that is, judges that flowmeter movement is faulty.
Flowmeter on-line diagnosing apparatus 77 includes Radio frequency interference sensor 8, feeder line 19, antenna 18, Radio Frequency Interfere
Process circuit 35 is connected with microprocessor system 29, and when detecting Radio Frequency Interfere, alarm signal processing module 37 is done
Intensity judgement is disturbed, alert and record live event when beyond predetermined value.
Embodiment is not construed as limitation of the present invention, any spiritual improvements introduced based on the present invention, all Ying Ben
Within the protection domain of invention.
Claims (4)
- A kind of 1. flowmeter inline diagnosis method, it is characterised in that：Its step is as follows：（1）The canonical function storehouse of the flowmeter of different nominal bores is established, according to some of the lower actual measurement of flow standard device calibrating Pressure loss value △ p under individual operating mode, by pressure loss △ p and flow q, pressure P, temperature T, density p, bore DN it is related Property：△ p=f (q, P, T, ρ, DN), establish the canonical function that flowmeter has determined type and the Calculation of pressure loss under nominal bore Storehouse；（2）Before flow-meter table to be measured, Fluid pressure is obtained after table respectively, and obtains pressure loss value p'；（3）From step（1）The reference pressure penalty values △ p of current flowmeter to be measured are transferred in the canonical function storehouse of middle acquisition, and will Step（2）The pressure loss value p' of middle acquisition compared with the reference pressure penalty values △ p transferred from canonical function storehouse, When it exceedes the value range of setting, then judge that the movement of the flow-meter to be measured breaks down；（4）By the Radio Frequency Interfere outside the detection of the Radio frequency interference sensor that is arranged in flow-meter to be measured, and Radio Frequency Interfere is converted into data signal and compared with the threshold value of setting, sentenced so as to carry out surrounding environment interference strength It is disconnected.
- A kind of 2. flowmeter inline diagnosis method according to claim 1, it is characterised in that step（3）Including following step Suddenly：The first step, the density parameter for obtaining flow and medium；Second step, type, nominal bore and the tolerance ε parameters for obtaining flow-meter to be measured；3rd step, according to the type and nominal bore parameter of the flow-meter to be measured obtained in second step from step（1）In Function data corresponding to acquisition；4th step, utilize the pressure loss value △ p in the case of the function data acquisition current working of acquisition.
- A kind of 3. flowmeter inline diagnosis method according to claim 1 or 2, it is characterised in that step（1）Or step （3）In pass through p=ρ (aQv 2+bQv+ c) functional expression and p=kMQv 2（P/T）Functional expression obtains the stream under each operating mode The pressure loss value of measuring instrument is measured, p is pressure loss value in formula, and ρ is Media density, and a, b, c are multinomial coefficient, and k is Pressure loss coefficient, QvFor rate-of flow, P is medium absolute pressure, and T is medium absolute temperature, and M is the molal weight of medium.
- 4. a kind of flowmeter inline diagnosis method according to claim 3, it is characterised in that if by detecting under dry cooling condition Pressure loss value, and the crushing for carrying out the mode of interpolation method or curve matching to obtaining pressure loss value and establishing under each bore Coefficient function storehouse, the set of each bore condition of pressure loss coefficient function library is as step（1）In canonical function storehouse.
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| CN110749355A (en) * | 2019-08-29 | 2020-02-04 | 天信仪表集团有限公司 | Diagnostic method based on rotational inertia |
| CN111811623A (en) * | 2020-07-23 | 2020-10-23 | 三门核电有限公司 | Auxiliary judgment method for measuring flow of high-pressure gas supply |
| CN113280874A (en) * | 2021-06-17 | 2021-08-20 | 孚洛泰(重庆)科技有限公司 | Self-checking flowmeter and self-checking method thereof |
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| CN107462305B (en) | 2019-09-13 |
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