CN205317309U - Mass flow meter velocity of flow analog system - Google Patents
Mass flow meter velocity of flow analog system Download PDFInfo
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- CN205317309U CN205317309U CN201520706358.6U CN201520706358U CN205317309U CN 205317309 U CN205317309 U CN 205317309U CN 201520706358 U CN201520706358 U CN 201520706358U CN 205317309 U CN205317309 U CN 205317309U
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Abstract
The utility model provides a mass flow meter velocity of flow analog system is applied to the measurement of fluid flow field, the utility model discloses a parameter setting to mass flow is realized to the human -computer interaction device, and then the communication cooperation of rethread controller and mass flow meter to realize verifying according to the phase difference that sets up different percentage test points whether the mass flow meter circuit function reach the linearity in reasonable scope. The utility model is suitable for an under the circumstances that does not need actual pipeline fluid, two magnetism electric sensor's of simulation mass flow meter time difference, realize the simulation and the linearity assay of the velocity of flow.
Description
Technical field
This utility model relates to field of liquid flow measurement, it is adaptable to when not needing actual pipeline fluid, it is achieved the simulation of flow velocity and linearity analysis, more specifically, particularly relates to a kind of mass flowmenter flow velocity analog systems.
Background technology
Owing to the mass flow of medium can directly be measured by mass flowmenter, solve traditional quality and measure employing on the basis of measurement volume flow, by density, temperature, pressure and other parameters measurement, convert and be adapted to mass flow, the method avoiding this indirect measurement mass flow, the shortcomings such as intermediate link is many, and cumulative errors are big so that it is be used widely.
When ultrasonic flowmeter before this is researched and developed, for obtaining the information of flow velocity, mass flowmenter U-tube sensor must be arranged on the pipeline of reality, and by the fluid of certain flow rate, just it is able to verify that whether effusion meter interlock circuit is normal, the relevant informations such as whether measurement result is linear. It is therefore desirable to design one produces mass flow meter sensor phase signal analog circuitry system, the Verification making mass flowmenter is operated in when not having actual pipeline and fluid, can also verification quality effusion meter whether normal, and in the reasonable scope whether the effusion meter linearity.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is in that to provide a kind of mass flowmenter flow velocity analog systems, for solving in prior art it is necessary to have the problem that could measure volume flow when pipeline and fluid.
For achieving the above object and other relevant purposes, this utility model provides techniques below scheme:
A kind of mass flowmenter flow velocity analog systems, including: human-computer exchange device, it is adaptable to the flow parameters of offer is arranged; Controller, it is adaptable to when first time detects startup button signal, the test point determining multiple different in flow rate range percentage ratios is set according to described flow parameters; DA sine-wave generator, it is adaptable to sequentially generate the phase signal that each test point is corresponding, and output it; Mass flowmenter, it is adaptable to when second time detects startup button signal, respond the phase signal that the plurality of test point is corresponding, obtain flow velocity corresponding to the plurality of test point and the linearity to calculate, and shown at described human-computer exchange device.
Preferably, also include: amplification circuit module, it is adaptable to before described phase signal is exported, after the described phase signal generated is amplified, exported.
Preferably, described phase signal is two-way constant amplitude time difference signal.
Preferably, described constant amplitude time difference signal includes the sine wave signal that amplitude is identical.
Compared with prior art, the technical solution of the utility model at least have following a little: this utility model can when there is no pipeline and fluid, by the parameter realized by human-computer interaction device arrange verification quality flowmeter electronics function whether and the linearity whether at zone of reasonableness; Efficiently solve the drawback that mass flowmenter functional verification just can must carry out under possessing pipeline and certain flow rate fluid situations, make the functional verification of mass flowmenter also can realize when without pipeline fluid.
Accompanying drawing explanation
Fig. 1 is shown as the flow chart of the mass flowmenter flow velocity analogy method that this utility model provides.
Fig. 2 is shown as the schematic diagram according to phase difference method mass metering flow.
Fig. 3 is shown as an embodiment schematic diagram of the mass flowmenter flow velocity analog systems that this utility model provides.
Fig. 4 is shown as another embodiment schematic diagram of the mass flowmenter flow velocity analog systems that this utility model provides.
Drawing reference numeral explanation
1 human-computer interaction device
2 controllers
3aDA sine-wave generator 1
3bDA sine-wave generator 2
4 mass flowmenters
5 amplification circuit module
S10-S30 method step
Detailed description of the invention
Below by way of specific instantiation, embodiment of the present utility model being described, those skilled in the art the content disclosed by this specification can understand other advantages of the present utility model and effect easily. This utility model can also be carried out by additionally different detailed description of the invention or apply, and the every details in this specification based on different viewpoints and application, can also carry out various modification or change under without departing from spirit of the present utility model. It should be noted that, when not conflicting, following example and the feature in embodiment can be mutually combined.
At present, whether mass flowmenter product circuit function normal and the linearity whether checking in certain scope, it is mass flowmenter is arranged on the demarcation official road of go-no-go mostly, by the fluid of certain speed, verify by changing the speed of fluid, when not possessing pipeline and fluid, such functional test cannot carry out. For this situation, this utility model provides a kind of mass flowmenter flow velocity analog systems, it is possible to when not having pipeline and fluid, arranged by parameter and generate phase contrast come verification quality flowmeter electronics function whether and the linearity whether at zone of reasonableness.
Refer to Fig. 1, it is shown that the flow chart of a kind of mass flowmenter flow velocity analogy method provided in the present embodiment, be described in detail below by way of concrete steps.
Step S10, it is provided that flow parameters is arranged.
In being embodied as, flow parameters is provided by input artificially and realizes ground, it is possible to set corresponding flow parameters according to the situation of effusion meter, for instance U-tube coefficient of elasticity (modulus), U-tube arc radius and structural constant etc.
Step S20, when first time detects startup button signal, arranges, according to the flow parameters provided, the test point determining multiple different in flow rate range percentage ratios, and obtains the difference of phase contrast corresponding to each test point successively.
Specifically, incorporated by reference to Fig. 2, giving the schematic diagram according to phase difference method mass metering flow, wherein, the computing formula of mass flow is:
In formula (1), Ks is U-tube coefficient of elasticity (modulus), and R is U-tube arc radius, and K is structural constant, and has K=R (4L+Qmπ R), L is U-tube flow development length, for mass flow, for U-tube phase contrast.It follows that after U-tube sensor shape is fixing, then R, Ks and K are constant, show that the phase contrast at two magnetoelectric transducers driving pipe two ends can draw mass flow Q as long as at this moment measuringm。
In being embodied as, after setting the flow parameters of mass flowmenter, after pressing test starting button for the first time, calculate through above-mentioned formula (1), it is assured that the test point at multiple different in flow rate range percentage ratios (generally arranges 5 test points, such as 10%, 30%, 60%, 90% and 100%, below just illustrate as example) corresponding phase contrast, i.e. the value of time difference value.
Step S30, when second time detects startup button signal, effusion meter responds the phase contrast difference that the plurality of test point is corresponding, obtains flow velocity corresponding to the plurality of test point and the linearity to calculate, and is shown.
In being embodied as, press test starting button, after startup button signal being detected, test process starts, effusion meter is first according to the above-mentioned test point determined and controls the time difference value corresponding to mass flow of output range 10% size, this time difference value exports to mass flowmenter with the form of two-way constant amplitude time difference signal, such as amplitude is the sine wave of 100 millivolts, and the two-way constant amplitude time difference signal of output is detected by mass flowmenter to be measured, and draws mass flow value; Similarly, the mass flow of following re-test range 30% size is corresponding, repeats said process until the mass flow testing range 100% size is corresponding. Finally all flow informations recorded are displayed after treatment on a display screen. It is to be appreciated that after range setting, 5 corresponding test points just specify that, it is change according to the sensor measurement scope on mass flowmenter that range sets, as range is set to 10g/s, corresponding 10%, 30%, 60%, 90%, 100% test point is (1g/s, 3g/s, 6g/s, 9g/s, 10g/s), range only one of which. In order to measure the linearity, different according to range, it is necessary to 5 test points are set, respectively the 10% of range, 30%, 60%, 90%, 100%, different test points, as shown in formula (1), after determining the parameters such as elastic modelling quantity, U-tube radius, structural constant, it is only necessary to change, if mass flowmenter to be measured work receiving and transmitting signal function is normal, just drawing corresponding theoretical velocity, linearity error is not to be exceeded 3%.
Further, in conjunction with Fig. 3, this utility model embodiment additionally provides the schematic diagram of a kind of mass flowmenter flow velocity analog systems, as shown in the figure, described mass flowmenter flow velocity analog systems includes human-computer exchange device, controller 2, DA sine-wave generator and mass flowmenter 4, wherein, controller 2 is connected to human-computer exchange device, DA sine-wave generator and mass flowmenter 4, and the flow parameters that human-computer exchange device is applicable to provide is arranged; Controller 2, it is adaptable to when first time detects startup button signal, the test point determining multiple different in flow rate range percentage ratios is set according to described flow parameters; DA sine-wave generator, it is adaptable to sequentially generate the phase signal that each test point is corresponding, and output it; Mass flowmenter 4, it is adaptable to when second time detects startup button signal, respond the phase signal that the plurality of test point is corresponding, obtain flow velocity corresponding to the plurality of test point and the linearity to calculate, and shown at described human-computer exchange device.
In being embodied as, further in conjunction with Fig. 3, mass flowmenter flow velocity analog systems described in the embodiment that this utility model provides includes two DA sine-wave generators, i.e. DA sine-wave generator 1 (3a) and DA sine-wave generator 2 (3b), controller 2 arranges according to flow parameters and controls DA sine-wave generator 1 (3a) and DA sine-wave generator 2 (3b) generates two sine wave signals, and make the amplitude of two sine wave signals keep equal, to form two constant amplitude time difference signals, namely the described phase signal of formation is simulated by two constant amplitude time difference signals.
Further, in mass flowmenter 4, two magnetoelectric transducers are after receiving two sine wave signals that above-mentioned two DA sine-wave generator generates, calculating obtains corresponding flow speed value and sends it to controller 2, then shows at human-computer interaction device 1 after the flow speed value corresponding to calculated each test point doing linearity simulation by controller 2.
In further detail, in being embodied as, controller 2 can adopt any one microcontroller 2 such as FPGA, ARM and single-chip microcomputer, here illustrate for FPGA, FPGA can pass through RS232 interface and communicate with mass flowmenter 4 to be measured, controls the sine wave-shaped signal of two D/A converter output out of phase differences according to order difference. From mass flow calculation formula (1) above, after setting mass flowmenter parameter (i.e. process parameter), system is assured that (illustrating for 5 test points here, these 5 test points are respectively as follows: 10%, 30%, 60%, 90% and 100% in multiple different range percentage ratio test points. ) corresponding phase is poor. Pressing the startup button on human-computer interaction device 1, test process starts. FPGA is started by RS232 interface notification mass flowmenter 4 test process, mass flowmenter 4 is first via the time difference value that the mass flow of FPGA control DA sine-wave generator output range 10% size is corresponding, such as export the sine wave of two-way amplitude 100 millivolts, the two-way constant amplitude time difference signal of output is detected by mass flowmenter to be measured, to calculate corresponding mass flow value (i.e. flow speed value) and to pass to FPGA, then by FPGA be sent on human-computer interaction device 1 show. Following system sends the time difference value that the mass flow of range 30% size is corresponding again, repeats said process until time difference value corresponding to the mass flow that obtains 100% size. Next will obtain mass flow value according to each time difference value to be more all sent to these mass flow value of FPGA, FPGA and be sent to human-computer interaction device 1 and show, and show at human-computer interaction device 1 after these mass flow value are done linear analogue matching.
It is to be appreciated that after range setting, 5 corresponding test points just specify that, it is measure scope according to magnetoelectric transducer in mass flowmenter 4 and change that range sets, as range is set to 10g/s, corresponding 10%, 30%, 60%, 90%, 100% test point is (1g/s, 3g/s, 6g/s, 9g/s, 10g/s), range only one of which. In order to measure the linearity, different according to range, it is necessary to 5 test points are set, respectively the 10% of range, 30%, 60%, 90%, 100%, different test points, as shown in formula (1), after determining the parameters such as elastic modelling quantity, U-tube radius, structural constant, it is only necessary to changing, if mass flowmenter to be measured 4 works, receiving and transmitting signal function is normal, just drawing corresponding theoretical velocity, system linearity degree error is not to be exceeded 3%.The test point that native system is arranged at present is above-mentioned 5, and this is also the real surely general test point required of failing to be sold at auction of flow velocity in ultrasonic flowmeter industry, after, it is possible to test point position and quantity is changed by touch screen flexible setting for parameters.
In being embodied as, refer to Fig. 4, the constant amplitude time difference signal generated due to DA sine-wave generator is wanted to think adaptation with mass flowmenter 4, one amplification circuit module 5 can also be set between DA sine-wave generator and mass flowmenter 4, it is applicable to before described phase signal is exported, after the described phase signal generated is amplified, exported to mass flowmenter 4.
In being embodied as, human-computer interaction device 1 can adopt the electronic equipment of touch screen type, can also being the electronic equipment of physics case type, this can carry out unrestricted choice according to ambient conditions and real needs, as long as data input function and data display function can be reached.
In sum, whether existing mass flowmenter product circuit function normal and the linearity whether checking in certain scope, it is mass flowmenter is arranged on the demarcation official road of go-no-go mostly, by the fluid of certain speed, verifies by changing the speed of fluid. When not possessing pipeline and fluid, such functional test cannot carry out. For this situation, this utility model provides a kind of mass flowmenter flow velocity analog systems, can when there is no pipeline and fluid, by the parameter realized by human-computer interaction device 1 arrange verification quality flowmeter electronics function whether and the linearity whether at zone of reasonableness. In a word, this utility model efficiently solves the drawback that mass flowmenter functional verification just can must carry out under possessing pipeline and certain flow rate fluid situations, makes the functional verification of mass flowmenter also can realize when without pipeline fluid.
Above-described embodiment only illustrative principle of the present utility model and effect thereof, not for restriction this utility model. Above-described embodiment all under spirit of the present utility model and category, can be modified or change by any those skilled in the art. Therefore, art has all equivalence modification or changes that usually intellectual completes under the spirit disclosed without departing from this utility model with technological thought such as, must be contained by claim of the present utility model.
Claims (4)
1. a mass flowmenter flow velocity analog systems, it is characterised in that including:
Human-computer exchange device, it is adaptable to the flow parameters of offer is arranged;
Controller, it is adaptable to when first time detects startup button signal, the test point determining multiple different in flow rate range percentage ratios is set according to described flow parameters;
DA sine-wave generator, it is adaptable to sequentially generate the phase signal that each test point is corresponding, and output it;
Mass flowmenter, it is adaptable to when second time detects startup button signal, respond the phase signal that the plurality of test point is corresponding, obtain flow velocity corresponding to the plurality of test point and the linearity to calculate, and shown at described human-computer exchange device.
2. mass flowmenter flow velocity analog systems according to claim 1, it is characterised in that also include:
Amplification circuit module, it is adaptable to before being exported by described phase signal, after the described phase signal generated is amplified, is exported.
3. mass flowmenter flow velocity analog systems according to claim 1, it is characterised in that described phase signal is two-way constant amplitude time difference signal.
4. mass flowmenter flow velocity analog systems according to claim 3, it is characterised in that described constant amplitude time difference signal includes the sine wave signal that amplitude is identical.
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| CN201520706358.6U CN205317309U (en) | 2015-09-11 | 2015-09-11 | Mass flow meter velocity of flow analog system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105115575A (en) * | 2015-09-11 | 2015-12-02 | 重庆川仪自动化股份有限公司 | Mass flowmeter flow velocity simulation method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105115575A (en) * | 2015-09-11 | 2015-12-02 | 重庆川仪自动化股份有限公司 | Mass flowmeter flow velocity simulation method and system |
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