CN107462305B - A kind of flowmeter inline diagnosis method - Google Patents
A kind of flowmeter inline diagnosis method Download PDFInfo
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- CN107462305B CN107462305B CN201710668647.5A CN201710668647A CN107462305B CN 107462305 B CN107462305 B CN 107462305B CN 201710668647 A CN201710668647 A CN 201710668647A CN 107462305 B CN107462305 B CN 107462305B
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- flowmeter
- flow
- pressure loss
- pressure
- loss value
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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 are as follows: (1) establishing the canonical function library of the flowmeter of different nominal bores；(2) before flow-meter table to be measured, Fluid pressure is obtained after table respectively, and obtain pressure loss value p'；3) it and by the pressure loss value p' obtained in step (2) is compared with the pressure loss value △ p read from canonical function library, when it is more than the value range of setting, then determines that the machine core of the flow-meter to be measured breaks down；(4) pass through the Radio Frequency Interfere outside the radio frequency interference sensor detection being arranged in flow-meter to be measured, and Radio Frequency Interfere is converted into digital signal and is compared with the threshold value of setting, carry out the judgement of ambient enviroment interference strength, can whether inline diagnosis flowmeter machine core abnormal, whether flowmeter is by extraneous radio frequency interference etc., better diagnostic techniques and multifarious diagnostic method are provided, so that reducing cost improves reliability.
Description
Technical field
The invention belongs to fluid metering fields, and in particular to a kind of flowmeter inline diagnosis side applied to fluid measurement
Method.
Background technique
Flowmeter is the instrument for measuring fluid flow in pipeline, is 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, has 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 measured is rotated by impeller
Meter, its working principle is that: the angular velocity of rotation for being placed in the impeller in fluid is directly proportional to fluid flow rate under operating condition, passes through survey
The angular speed of amount impeller can be obtained by fluid flow rate, to obtain the flow value in pipeline.In certain range of flow, survey
The pulse frequency f for measuring the output of impeller angular speed is directly proportional to the instantaneous flow Q of fluid for flowing through sensor, turbine flowmeter stream
Measure equation are as follows:
Q=f/k,
In formula: f --- pulse frequency；K --- the instrument coefficient Q of flowmeter --- instantaneous flow of fluid
It is a kind of fluid meters such as precession spiral flowmeter category fluid oscillating type instrument.Its working principle is that: enter
The fluid of flowmeter generates whirlpool, eddy-currents precession in Venturi tube, until contraction section throttles suddenly to be made by eddy generator
Eddy-currents accelerates, and after whirlpool flows into diffuser, carries out screw type secondary rotating because reflux acts on forcing.The rotation of eddy-currents at this time
Turn that frequency is directly proportional to medium flow field, passes through the measurement eddy-currents speed directly proportional to medium flow field, so that it may obtain the stream of fluid
Amount.Flowmeter formula are as follows:
Q=f/k,
In formula: f --- vortex frequency；K --- the instrument coefficient Q of flowmeter --- instantaneous flow of fluid
Every flowmeter instrument coefficient fills in calibration certificate in the standard set-up verification by legal gauge check mechanism
In, k value is set in matched correction instrument or display instrument, can show instantaneous flow and accumulation total amount
Flowmeter is in use, over time, flowmeter measurement core part because burn into damage or solid and
Thick liquid attachment accumulation or air intake duct are blocked by impurity, can be changed the instrument coefficient k of flowmeter, be influenced metric results
Correctness.
The metering reliability of flowmeter is also by radio-frequency radiation interference effect.
The calibration for maintaining an appropriate period is a kind of method for solving metering reliability, usually flowmeter is separated
Scene is sent to legal gauge check mechanism and is calibrated using standard set-up.
It is that a calibrated accurate flow instrument of connecting is passed through using double track metering comparison confirmation there are also a kind of known method
Table carries out fault recognition to running flowmeter.
These known methods will dismantle instrument, using external flow standard set-up for diagnosing；Or increase flow instrument
Table quantity is for data comparison to confirm that the failure of flowmeter.These approaches increases costs and complexity, do not mention in real time
For the diagnosis of flowmeter basic element of character situation, it is therefore necessary to better diagnostic techniques and multifarious diagnostic method are provided, from
And it reduces cost and improves reliability.
Summary of the invention
For the technical deficiency more than overcoming, 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 are as follows:
(1) the canonical function library of the flowmeter of different nominal bores is established, according to the lower actual measurement of flow standard device calibrating
Pressure loss value △ p under several operating conditions passes through pressure loss △ p and flow q, pressure P, temperature T, density p, bore DN
Correlation: △ p=f (q, P, T, ρ, DN) establishes the standard letter that flowmeter has determined type and the Calculation of pressure loss under nominal bore
Number library；
(2) before flow-meter table to be measured, Fluid pressure is obtained after table respectively, and obtain pressure loss value p'；
(3) the reference pressure penalty values △ p of current flowmeter to be measured is transferred in the canonical function library obtained from step (1),
And the pressure loss value p' obtained in step (2) is carried out with the reference pressure penalty values △ p transferred from canonical function library
Compare, when it is more than the value range of setting, then determines that the machine core of the flow-meter to be measured breaks down；
(4) pass through the radio frequency interference letter outside the radio frequency interference sensor detection being arranged in flow-meter to be measured
Number, and Radio Frequency Interfere is converted into digital signal and is compared with the threshold value of setting, to carry out ambient enviroment interference
Intensity judgement.
Step (3) the following steps are included:
The first step, the density parameter for obtaining flow and medium；
Second step, type, nominal bore and the tolerance ε parameter for obtaining flow-meter to be measured；
Third step, according to the type and nominal bore parameter of the flow-meter to be measured obtained in second step from step
(1) corresponding function data is obtained in；
4th step utilizes the normal pressure penalty values △ p in the case of the function data acquisition current working of acquisition.
Pass through p=ρ (aQ in step (1) or step (3)v 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 condition, 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 carrying out interpolation method or curve matching by the pressure loss value under detection dry cooling condition, and to pressure loss value is obtained
Mode establish the pressure loss coefficient function library under each bore, the set of each bore condition of pressure loss coefficient function library is as step
(1) the canonical function library in.
Beneficial effects of the present invention: can whether inline diagnosis flowmeter machine core abnormal, whether flowmeter is dry by extraneous radio frequency
It disturbs, provides better diagnostic techniques and multifarious diagnostic method, so that reducing cost improves reliability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram 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 machine core judgement processing mould group flow diagram extremely.
Fig. 4 is that the present invention is applied to the example with inline diagnosis flowmeter.
Fig. 5 is that the present invention is applied to the example with independent on-line diagnosing apparatus flowmeter.
Specific embodiment
Embodiments of the present invention is further illustrated with reference to the accompanying drawing:
As shown in figure 3, the present invention provides a kind of flowmeter inline diagnosis method, its step are as follows:
(1) the canonical function library of the flowmeter of different nominal bores is established, according to the lower actual measurement of flow standard device calibrating
Pressure loss value △ p under several operating conditions passes through pressure loss △ p and flow q, pressure P, temperature T, density p, bore DN
Correlation: △ p=f (q, P, T, ρ, DN) establishes the standard letter that flowmeter has determined type and the Calculation of pressure loss under nominal bore
Number library；
(2) before flow-meter table to be measured, Fluid pressure is obtained after table respectively, and obtain pressure loss value p'；
(3) the reference pressure penalty values △ p of current flowmeter to be measured is transferred in the canonical function library obtained from step (1),
And the pressure loss value p' obtained in step (2) is carried out with the reference pressure penalty values △ p transferred from canonical function library
Compare, when it is more than the value range of setting, then determines that the machine core of the flow-meter to be measured breaks down；
(4) pass through the radio frequency interference letter outside the radio frequency interference sensor detection being arranged in flow-meter to be measured
Number, and Radio Frequency Interfere is converted into digital signal and is compared with the threshold value of setting, to carry out ambient enviroment interference
Intensity judgement.
Step (3) the following steps are included:
The first step, the density parameter for obtaining flow and medium；
Second step, type, nominal bore and the tolerance ε parameter for obtaining flow-meter to be measured；
Third step, according to the type and nominal bore parameter of the flow-meter to be measured obtained in second step from step
(1) corresponding function data is obtained in；
4th step utilizes the pressure loss value △ p in the case of the function data acquisition current working of acquisition.
Pass through p=ρ (aQ in step (1) or step (3)v 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 condition, 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 carrying out interpolation method or curve matching by the pressure loss value under detection dry cooling condition, and to pressure loss value is obtained
Mode establish the pressure loss coefficient function library under each bore, the set of each bore condition of pressure loss coefficient function library is as step
(1) the canonical function library in.
The present invention is in conjunction with traditional volume correction instrument, the method for increasing inline diagnosis using online diagnosing technique of support shaft, thus
It reduces cost and improves reliability.As depicted in figs. 1 and 2, the volume correction instrument with diagnostic techniques includes shell 10 and can open
The front cover of setting on the shell is opened, power supply 14 and circuit board 12 is equipped in the shell, antenna is equipped on the shell 10
18, signal output interface 21, communication interface 15, the first signal input interface 16, second signal input interface 17, the circuit board
It is arranged in shell 10, is sequentially installed with differential pressure signal processing circuit 7, pressure signal thereonProcessing circuit 4, pressure signal
Processing circuit 2, processes temperature signal circuit 1, flow signal processing circuit 3, communication module 13, alarm output module 20 and micro-
Processor system 11, the circuit board 12 are equipped with radio frequency interference detection module 8, which passes through feeder line 19
It is connect with antenna 18.The radio frequency interference detection module 8 is connect with the circuit board 12 by detection module connector 9.
The circuit board is equipped with flexible connector 6, and the front cover is electrically connected with shell 10 by flexible connector.
The microprocessor system 29, including machine core extremely judgement processing mould group 36, alarm signal processing mould group 37 with
And canonical function library 38.
The canonical function library 38 is the pressure under several operating conditions 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), packet
It includes and establishes flowmeter using curve matching and interpolation method and determined Calculation of pressure loss function data under type and nominal bore
Library, the set of each bore condition in crushing design factor function data library, as canonical function library 38 in microprocessor system 29
Storage, memory select nonvolatile memory
The differential pressure signal processing circuit 7, input signal connect differential pressure pick-up or two-way pressure sensor, output flow
Before counting table, the pressure loss value p' after table, output signal is connected to microprocessor system 29；Machine in microprocessor system 29
Core judgement processing mould group 36, the nominal bore according to flowmeter extremely obtain respective function data value into canonical function library 38,
According to current flow value, pressure value, temperature value and Media density, the normal pressure penalty values p under the operating condition is obtained, then with
Pressure loss value p' compares before and after measured discharge meter, and whether inline diagnosis flowmeter machine core is abnormal.
The flow signal processing circuit 3 can receive the flow measurement signal of flowmeter, be carried out according to the type of signal
Pretreatment.Pressure signalProcessing circuit 4, pressure signalProcessing circuit 2 receives pressure sensor signal, is microprocessor system
System provides the integrated mode of a variety of pressure measurements.
Radio frequency interference sensor signal processing circuit 35 is connected with microprocessor system 29, when detecting Radio Frequency Interfere
When, alarm signal handles mould group 37 and carries out interference strength judgement, alert and the live thing of record when exceeding predetermined value
Part.
Digital communications module 28 is connected with microprocessor system 29, by wire communication and wireless communication, transmits flowmeter
The various parameters and warning message of inline diagnosis, and receive the data information 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 volume correction instrument (the following letter with inline diagnosis function using the technology of the present invention in Fig. 4
Claim volume correction instrument 44).In Fig. 4, temperature sensor 47 and pressure sensor 51 are mounted in flowmeter, the temperature of measuring 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 on preceding straight pipe 41 and rear straight pipe 46.
Differential pressure pick-up 42 is connected with preceding straight pipe 41 and rear straight pipe 46, and output signal is connected to volume correction instrument through signal cable
44.With reference to Fig. 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 Fig. 3, machine core 36 mould groups of judgement processing extremely, nominal bore according to this flowmeter is to marking
The function data value under corresponding nominal bore is obtained in quasi-function library 38, according to current flow value, pressure value, temperature value and Jie
Matter density obtains the reference standard pressure loss value p under the operating condition, then the measured discharge meter with differential pressure signal processing circuit 34
Front and back pressure loss value p' compares, and deviation exceeds range of set value, that is, judges that flowmeter machine core is faulty.
Fig. 5, which is applied to another for the present invention, has the function of an example of inline diagnosis flowmeter, using with this hair
A kind of flowmeter on-line diagnosing apparatus 77 of bright technology is in conjunction 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 pipe 71 are connected with signal cable by volume correction instrument 74
With the pressure port for being mounted with differential pressure pick-up 72 on rear straight pipe 78.Differential pressure pick-up 72 and preceding straight pipe 71 or rear straight pipe 78
It is connected, the pressure before measuring flow instrument, after table, output signal is connected to volume correction instrument 74 through signal cable.Measurement stream
Before measuring instrument, the pressure after table, in addition to differential pressure pick-up, also mountable two pressure sensors, before measuring table respectively, table
Pressure afterwards.Flowmeter on-line diagnosing apparatus 77 can be with volume correction instrument 74 in addition to exchanging information with signal cable connection, can also
Data are exchanged by communication interface.
The signal of differential pressure pick-up 72 is connected to flowmeter on-line diagnosing apparatus 77 through connecting cable and volume correction instrument
In, differential pressure signal is exported to microprocessor system 29 through differential pressure signal processing circuit 7.Output signal is connected to body through signal cable
Product correction instrument 74.With reference to Fig. 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 Fig. 3, machine core judgement processing mould group 36 extremely, the nominal according to this flowmeter
Bore obtains the function data value under corresponding nominal bore into canonical function library 38, according to current flow value, pressure value, temperature
Angle value and Media density obtain the reference standard pressure loss value p under the operating condition, then the reality with differential pressure signal processing circuit 7
Pressure loss value p' compares before and after flow measurement meter, and deviation exceeds range of set value, that is, judges that flowmeter machine core is faulty.
Flowmeter on-line diagnosing apparatus 77 includes radio frequency interference sensor 8, feeder line 19, antenna 18, Radio Frequency Interfere
Processing circuit 35 is connected with microprocessor system 29, and when detecting Radio Frequency Interfere, alarm signal processing mould group 37 is done
Intensity judgement is disturbed, alert and record live event when exceeding predetermined value.
Embodiment is not construed as limitation of the present invention, any based on spiritual improvements introduced of the invention, all Ying Ben
Within the protection scope of invention.
Claims (4)
1. a kind of flowmeter inline diagnosis method, it is characterised in that: its step are as follows:
(1) the canonical function library of the flowmeter of different nominal bores is established, according to the several of the lower actual measurement of flow standard device calibrating
Pressure loss value Δ p and flow q, pressure P under a operating condition, temperature T, density p, the correlation of bore DN: Δ p=f (q, P, T,
ρ, DN), using curve matching or interpolation method, establish the standard that flowmeter has determined type and the Calculation of pressure loss under nominal bore
Function library；
(2) before flow-meter table to be measured, Fluid pressure is obtained after table respectively, and obtain pressure loss value Δ p'；
(3) the reference pressure penalty values Δ p of current flowmeter to be measured is transferred in the canonical function library obtained from step (1), and will
The pressure loss value Δ p ' obtained in step (2) is compared with the reference pressure penalty values Δ p transferred from canonical function library,
When it is more than the value range of setting, then determine that the machine core of the flow-meter to be measured breaks down；
(4) pass through the Radio Frequency Interfere outside the radio frequency interference sensor detection being arranged in flow-meter to be measured, and
Radio Frequency Interfere is converted into digital signal and is compared with the threshold value of setting, is sentenced to carry out ambient enviroment interference strength
It is disconnected.
2. a kind of flowmeter inline diagnosis method according to claim 1, which is characterized in that step (3) includes following step
It is rapid:
The first step, the density parameter for obtaining flow and medium；
Second step, type, nominal bore and the tolerance ε parameter for obtaining flow-meter to be measured；
Third step, according to the type and nominal bore parameter of the flow-meter to be measured obtained in second step from step (1)
Obtain corresponding function data；
4th step utilizes the pressure loss value Δ p in the case of the function data acquisition current working of acquisition.
3. a kind of flowmeter inline diagnosis method according to claim 1 or 2, which is characterized in that step (1) or step
(3) pass through inFunctional expression andFunctional expression obtains the flow under each operating condition
The pressure loss value of measuring instrument, Δ p is pressure loss value in formula, and ρ is Media density, and a, b, c are multinomial coefficient, and k is pressure
Damage 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, which is characterized in that if by under detection dry cooling condition
Pressure loss value, and the crushing under each bore is established to the mode for obtaining pressure loss value and carrying out interpolation method or curve matching
Coefficient function library, the set of each bore condition of pressure loss coefficient function library is as the canonical function library in step (1).
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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 |
| CN111811623B (en) * | 2020-07-23 | 2022-06-07 | 三门核电有限公司 | Auxiliary judgment method for measuring flow of high-pressure gas supply |
| CN113280874B (en) * | 2021-06-17 | 2022-06-14 | 孚洛泰(重庆)科技有限公司 | Self-checking flowmeter and self-checking method thereof |
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