CN105318918A - A non-magnetic flow metering device and a metering method thereof - Google Patents
A non-magnetic flow metering device and a metering method thereof Download PDFInfo
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Abstract
The invention provides a non-magnetic flow metering device and a metering method thereof. The device comprises a shell. An impeller and a detection device are arranged in the shell. The detection device comprises a central processing unit, an energizing circuit, a voltage raising circuit, an LC oscillating circuit and an envelope detection circuit. A first output end of the central processing unit is electrically connected with an input end of the energizing circuit and a second output end of the central processing unit is electrically connected with an input end of the voltage raising circuit. An output end of the energizing circuit and an output end of the voltage raising circuit are electrically connected with an input end of the LC oscillating circuit. An output end of the LC oscillating circuit is electrically connected with an input end of the envelope detection circuit. An output end of the envelope detection circuit is electrically connected with an input end of the central processing unit. The LC oscillating circuit is arranged above the impeller. One half of the surface, facing the LC oscillating circuit, of the impeller is an insulation area made of insulating material and the other half is an electric conduction area made of electric conduction material. The non-magnetic flow metering device is low in cost, facilitates extension, and is free of influence of temperature.
Description
Technical field
The present invention relates to flow metering technical field, particularly relate to a kind of non-magnetic flowmeter amount device and metering method thereof.
Background technology
Mechanical heat meter can divide according to flow detection mode magnetic-type, magnetism-free type.Have the shortcoming of magnetic-type to be need in impeller to install magnet, the impurity in magnet magnetic meeting planar water, have influence on the rotation of impeller, and magnet magnetic is strong and weak relevant with service time and environment temperature.And the Cleaning Principle of magnetism-free type installs inductance as sensor above impeller.Inductance towards impeller face be alternately made up of plastic cover and metal covering.During vane rotary, the LC oscillatory circuit that peripheral circuit forms to inductance provides pulse, and LC oscillatory circuit can produce damped oscillation, when being plastic cover below inductance, LC oscillatory circuit waveform attenuating is comparatively slow, and when being metal covering below inductance, LC oscillatory circuit waveform attenuating is very fast.By detecting the LC oscillatory circuit waveform attenuating time, can learn whether impeller is in rotation status, thus carrying out flow metering.
Because magnetism-free type is not easy to adsorb impurities in water, so magnetism-free type is lower to pipeline water quality requirement, be widely used in calorimeter.At present in calorimeter, non-magnetic flowmeter amount scheme uses MSP430FW42X scheme, and MSP430FW42X is that Texas Instrument releases, with a series of single-chip microcomputers with or without Magnetic testi module.MSP430FW42X scheme hardware also exists limitation: the program must use MSP430FW42X series as single-chip microcomputer, this single-chip microcomputer cost is higher, and hardware resource is less, without USART interface with only cause the program cannot use in complicated field containing 2KRAM.
Operating temperature range due to category-B calorimeter is-25 ~ 55 DEG C.When non-magnetic flowmeter amount is applied in calorimeter, the impact of environment temperature on metering need be considered.Especially use discrete device without the calorimeter of magnetic circuit, discrete device is generally made up of inductance, diode, triode, resistance, electric capacity without magnetic circuit, and diode drop size, capacitor's capacity are subject to environment temperature and change, thus affect the oscillatory extinction time.Existing metering method can not avoid environment temperature to oscillatory extinction time effects, under high/low temperature, the oscillatory extinction time may change, therefore need to calibrate before use, with obtain LC oscillatory circuit over a conductive region side time die-away time threshold value and LC oscillatory circuit above insulating regions time threshold value die-away time, and if in the course of the work variation of ambient temperature comparatively conference cause normally to carry out gage work.
Summary of the invention
The object of the invention is to overcome existing non-magnetic flowmeter amount device and must use MSP430FW42X series monolithic, cost is higher, not easily expand, and technical matters influenced by ambient temperature, provide a kind of non-magnetic flowmeter amount device and metering method thereof, its cost is lower, is convenient to expansion, and not temperature influence.
In order to solve the problem, the present invention is achieved by the following technical solutions:
A kind of non-magnetic flowmeter amount device of the present invention, comprise housing, impeller and pick-up unit is provided with in described housing, described pick-up unit comprises CPU (central processing unit), energizing circuit, voltage lifting circuit, LC oscillatory circuit and envelope detection circuit, first output terminal of described CPU (central processing unit) is electrically connected with the input end of energizing circuit, second output terminal of described CPU (central processing unit) is electrically connected with the input end of voltage lifting circuit, the output terminal of described energizing circuit and the output terminal of voltage lifting circuit are electrically connected with the input end of LC oscillatory circuit, the described output terminal of LC oscillatory circuit is electrically connected with the input end of envelope detection circuit, the output terminal of described envelope detection circuit is electrically connected with the input end of CPU (central processing unit), described LC oscillatory circuit is arranged on the top of impeller, described impeller is towards the one side of LC oscillatory circuit, half is the insulating regions that insulating material is made, second half is the conductive region that conductive material is made.
In the technical program, CPU (central processing unit) is single-chip microcomputer.During work, first output terminal of CPU (central processing unit) exports high level, energizing circuit produces high level and charges to LC oscillatory circuit, after the charging complete of LC oscillatory circuit, first output terminal output low level of CPU (central processing unit), energizing circuit output low level is stopped power supply, and LC oscillatory circuit starts vibration.Second output terminal of CPU (central processing unit) exports high level and is given to voltage lifting circuit, voltage lifting circuit produces d. c. voltage signal, the waveform signal that this d. c. voltage signal produces with LC oscillatory circuit superposes, and makes follow-up waveform signal can reach the comparison range of CPU (central processing unit) internal comparator.The waveform that LC oscillatory circuit exports outputs to the input end of CPU (central processing unit) after envelope detection circuit process, CPU (central processing unit) processes the waveform received, detect the die-away time of this waveform, judge that the impeller face below LC oscillatory circuit is insulating regions or conductive region, the alternate frequency of impeller face between insulating regions and conductive region below statistics LC oscillatory circuit, thus calculate total flow.
As preferably, described energizing circuit comprises diode D1 and resistance R1, the positive pole of diode D1 is electrically connected with the first output terminal of CPU (central processing unit), and the negative pole of diode D1 is electrically connected with resistance R1 one end, and the resistance R1 other end is electrically connected with the input end of LC oscillatory circuit.
As preferably, described voltage lifting circuit comprises resistance R2, resistance R3 and electric capacity C1, resistance R2 one end is electrically connected with the second output terminal of CPU (central processing unit), the input end of the resistance R2 other end and resistance R3 one end, electric capacity C1 one end and LC oscillatory circuit is electrically connected, the resistance R3 other end and the electric capacity C1 other end all ground connection.
As preferably, described LC oscillatory circuit comprises electric capacity C2 and inductance L 1, described electric capacity C2 and inductance L 1 in parallel.
As preferably, described envelope detection circuit comprises diode D2, resistance R4, resistance R5 and electric capacity C3, diode D2 positive pole is electrically connected with the output terminal of LC oscillatory circuit, diode D2 negative pole is electrically connected with resistance R4 one end, the input end of the resistance R4 other end and electric capacity C3 one end, resistance R5 one end and CPU (central processing unit) is electrically connected, the electric capacity C3 other end and the resistance R5 other end all ground connection.
As preferably, described housing is provided with wireless communication module, and described wireless communication module is electrically connected with CPU (central processing unit).The flow value of metering is sent to remote monitoring terminal by wireless communication module by CPU (central processing unit).
The metering method of a kind of non-magnetic flowmeter amount device of the present invention, comprises the following steps:
S1: CPU (central processing unit) empties the M the shortest die-away time of storage;
S2: CPU (central processing unit) excites the work of LC oscillatory circuit once by energizing circuit, LC oscillatory circuit exports waveform, waveform outputs to the input end of CPU (central processing unit) after envelope detection circuit process, and CPU (central processing unit) obtains the current attenuation time T1 of envelope detection circuit output waveform;
S3: CPU (central processing unit) judges to store the shortest die-away time, whether the value of M was empty, if so, then by the shortest die-away time M value change to this current die-away time of T1, then perform step S2, otherwise perform step S4;
S4: CPU (central processing unit) judges whether current attenuation time T1 is less than M the shortest die-away time, if so, then by the shortest die-away time M value change to this current die-away time of T1, then perform step S2, otherwise perform step S5;
S5: CPU (central processing unit) judges whether the value that current attenuation time T1 deducts M the shortest die-away time is greater than setting value D, i.e. whether T1-M > D, if it is show that the impeller face below LC oscillatory circuit rotates to insulating regions from conductive region, perform step S6, otherwise perform step S2;
S6: CPU (central processing unit) record pulse, then empties the N the longest die-away time of storage;
S7: CPU (central processing unit) excites the work of LC oscillatory circuit once by energizing circuit, LC oscillatory circuit exports waveform, waveform outputs to the input end of CPU (central processing unit) after envelope detection circuit process, and CPU (central processing unit) obtains the current attenuation time T1 of envelope detection circuit output waveform;
S8: CPU (central processing unit) judges to store the longest die-away time, whether the value of N was empty, if so, then by the longest die-away time N value change to this current die-away time of T1, then perform step S7, otherwise perform step S9;
S9: CPU (central processing unit) judges whether current attenuation time T1 is greater than N the longest die-away time, if so, then by the longest die-away time N value change to this current die-away time of T1, then perform step S7, otherwise perform step S10;
S10: whether the value that CPU (central processing unit) judgement N the longest die-away time deducts current attenuation time T1 is greater than setting value D, i.e. whether N-T1 > D, if it is show that the impeller face below LC oscillatory circuit rotates to conductive region from insulating regions, perform step S11, otherwise perform step S7;
S11: CPU (central processing unit) record pulse, then performs step S1;
CPU (central processing unit) calculates total flow according to the overall pulse number flowmeter corresponding with each pulse of record.
In the technical program, non-magnetic flowmeter amount device at different temperatures, envelope detection circuit output waveform the shortest die-away time M and the longest die-away time N can change to some extent, but the difference between the shortest die-away time M and the longest die-away time N is substantially constant, setting value D is non-magnetic flowmeter amount device marking the half of the longest die-away time when testing under condition with difference the shortest die-away time.This method detect in real time renewal M the shortest die-away time and the longest die-away time N, when impeller face below LC oscillatory circuit turns to the intersection of conductive region and insulating regions, die-away time be the up-to-date M the shortest die-away time recorded add setting value D or the longest die-away time N deduct setting value D.Therefore, when impeller face below LC oscillatory circuit rotates to insulating regions from conductive region, the value that current attenuation time T1 deducts M the shortest die-away time is greater than setting value D, when impeller face below LC oscillatory circuit rotates to conductive region from insulating regions, whether the value that the longest die-away time, N deducted current attenuation time T1 is greater than setting value D.This method adopts difference as examination criteria, can overcome high/low temperature change to the impact detected, still can normally work in the environment that temperature variation is larger, and without the need to calibration when using.
As preferably, described CPU (central processing unit) excites LC oscillatory circuit work method once to comprise the following steps by energizing circuit: the first output terminal of CPU (central processing unit) exports high level, energizing circuit produces high level and charges to LC oscillatory circuit, after the charging complete of LC oscillatory circuit, first output terminal output low level of CPU (central processing unit), energizing circuit output low level is stopped power supply, and LC oscillatory circuit starts vibration.
As preferably, the acquisition methods of described waveform die-away time comprises the following steps: in CPU (central processing unit) record waveform, voltage is higher than the time of setting value K, and this time value is the die-away time of waveform.
As preferably, described setting value D is non-magnetic flowmeter amount device marking the half of the longest die-away time when testing under condition with difference the shortest die-away time.
Substantial effect of the present invention is: cost is lower, is convenient to expansion, can overcome high/low temperature change to the impact detected, still can normally work in the environment that temperature variation is larger, and without the need to calibration when using.
Accompanying drawing explanation
Fig. 1 is that a kind of circuit theory of the present invention connects block diagram;
Fig. 2 is a kind of structural representation of impeller;
Fig. 3 is a kind of circuit theory diagrams of pick-up unit;
Fig. 4 be LC oscillatory circuit over a conductive region side time envelope detection circuit output waveform;
Fig. 5 be LC oscillatory circuit above insulating regions time envelope detection circuit output waveform;
Fig. 6 is a kind of process flow diagram of the present invention.
In figure: 1, CPU (central processing unit), 2, energizing circuit, 3, voltage lifting circuit, 4, LC oscillatory circuit, 5, envelope detection circuit, 6, impeller, 7, conductive region, 8, insulating regions, 9, wireless communication module, 10, storage unit.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is done more specifically bright.
Embodiment: a kind of non-magnetic flowmeter amount device of the present embodiment, as Fig. 1, shown in Fig. 2, comprise housing, impeller and pick-up unit is provided with in housing, housing is provided with wireless communication module 9, pick-up unit comprises CPU (central processing unit) 1, energizing circuit 2, voltage lifting circuit 3, LC oscillatory circuit 4, envelope detection circuit 5 and storage unit 10, first output terminal of CPU (central processing unit) 1 is electrically connected with the input end of energizing circuit 2, second output terminal of CPU (central processing unit) 1 is electrically connected with the input end of voltage lifting circuit 3, the output terminal of energizing circuit 2 and the output terminal of voltage lifting circuit 3 are electrically connected with the input end of LC oscillatory circuit 4, the output terminal of LC oscillatory circuit 4 is electrically connected with the input end of envelope detected circuit 5, the output terminal of envelope detected circuit 5 is electrically connected with the input end of CPU (central processing unit) 1, CPU (central processing unit) 1 is also electrically connected with wireless communication module 9 and storage unit 10 respectively, LC oscillatory circuit 4 is arranged on the top of impeller 6, impeller 6 is towards the one side of LC oscillatory circuit 4, half is the insulating regions 8 that insulating material is made, second half is the conductive region 7 that conductive material is made.
As shown in Figure 3, energizing circuit 2 comprises diode D1 and resistance R1, voltage lifting circuit 3 comprises resistance R2, resistance R3 and electric capacity C1, LC oscillatory circuit 4 comprises electric capacity C2 and inductance L 1, envelope detection circuit 5 comprises diode D2, resistance R4, resistance R5 and electric capacity C3, the positive pole of diode D1 is electrically connected with the first output terminal of CPU (central processing unit) 1, the negative pole of diode D1 is electrically connected with resistance R1 one end, the resistance R1 other end and resistance R2 one end, resistance R3 one end, electric capacity C1 one end, electric capacity C2 one end and the electrical connection of inductance L 1 one end, the resistance R2 other end is electrically connected with the second output terminal of CPU (central processing unit) 1, the resistance R3 other end and electric capacity C1 other end ground connection, the electric capacity C2 other end and inductance L 1 other end are electrically connected with the positive pole of diode D2, the negative pole of diode D2 is electrically connected with resistance R4 one end, the resistance R4 other end and electric capacity C3 one end, the input end electrical connection of resistance R5 one end and CPU (central processing unit) 1, the electric capacity C3 other end and the resistance R5 other end all ground connection.
CPU (central processing unit) 1 is single-chip microcomputer, and housing is with import and outlet.During work, first output terminal of CPU (central processing unit) 1 exports high level, energizing circuit 2 produces high level and charges to LC oscillatory circuit 4, after LC oscillatory circuit 4 charging complete, first output terminal output low level of CPU (central processing unit) 1, energizing circuit 2 output low level is stopped power supply, and LC oscillatory circuit 4 starts vibration.Second output terminal of CPU (central processing unit) 1 exports high level and is given to voltage lifting circuit 3, voltage lifting circuit 3 electric resistance partial pressure produces d. c. voltage signal, the waveform signal that this d. c. voltage signal produces with LC oscillatory circuit 4 superposes, and makes follow-up waveform signal can reach the comparison range of CPU (central processing unit) 1 internal comparator.The waveform that LC oscillatory circuit 4 exports outputs to the input end of CPU (central processing unit) 1 after envelope detection circuit 5 processes.
LC oscillatory circuit over a conductive region side time envelope detection circuit output waveform, as shown in Figure 4, the output waveform of envelope detection circuit when LC oscillatory circuit is above insulating regions, as shown in Figure 5, the die-away time of waveform shown in Fig. 4 is obviously short than the die-away time of waveform shown in Fig. 5.The waveform that CPU (central processing unit) 1 pair of envelope detection circuit 5 exports processes, detect the die-away time of this waveform, judge that the impeller face below LC oscillatory circuit 4 is insulating regions or conductive region, the alternate frequency of impeller face between insulating regions and conductive region below statistics LC oscillatory circuit 4, thus calculate total flow.Storage unit 10 stores the data on flows of metering, and the flow value of metering is sent to remote monitoring terminal by wireless communication module 9 by CPU (central processing unit).Housing is also provided with radio-frequency module, and user can use radio-frequency card to swipe the card at radio-frequency module place payment.
The metering method of a kind of non-magnetic flowmeter amount device of the present embodiment, is applicable to above-mentioned a kind of non-magnetic flowmeter amount device, as shown in Figure 6, comprises the following steps:
S1: CPU (central processing unit) empties the M the shortest die-away time of storage;
S2: time delay 5ms, CPU (central processing unit) excites the work of LC oscillatory circuit once by energizing circuit, LC oscillatory circuit exports waveform, waveform outputs to the input end of CPU (central processing unit) after envelope detection circuit process, and CPU (central processing unit) obtains the current attenuation time T1 of envelope detection circuit output waveform;
S3: CPU (central processing unit) judges to store the shortest die-away time, whether the value of M was empty, if so, then by the shortest die-away time M value change to this current die-away time of T1, then perform step S2, otherwise perform step S4;
S4: CPU (central processing unit) judges whether current attenuation time T1 is less than M the shortest die-away time, if so, then by the shortest die-away time M value change to this current die-away time of T1, then perform step S2, otherwise perform step S5;
S5: CPU (central processing unit) judges whether the value that current attenuation time T1 deducts M the shortest die-away time is greater than setting value D, i.e. whether T1-M > D, if it is show that the impeller face below LC oscillatory circuit rotates to insulating regions from conductive region, perform step S6, otherwise perform step S2;
S6: CPU (central processing unit) record pulse, then empties the N the longest die-away time of storage;
S7: time delay 5ms, CPU (central processing unit) excites the work of LC oscillatory circuit once by energizing circuit, LC oscillatory circuit exports waveform, waveform outputs to the input end of CPU (central processing unit) after envelope detection circuit process, and CPU (central processing unit) obtains the current attenuation time T1 of envelope detection circuit output waveform;
S8: CPU (central processing unit) judges to store the longest die-away time, whether the value of N was empty, if so, then by the longest die-away time N value change to this current die-away time of T1, then perform step S7, otherwise perform step S9;
S9: CPU (central processing unit) judges whether current attenuation time T1 is greater than N the longest die-away time, if so, then by the longest die-away time N value change to this current die-away time of T1, then perform step S7, otherwise perform step S10;
S10: whether the value that CPU (central processing unit) judgement N the longest die-away time deducts current attenuation time T1 is greater than setting value D, i.e. whether N-T1 > D, if it is show that the impeller face below LC oscillatory circuit rotates to conductive region from insulating regions, perform step S11, otherwise perform step S7;
S11: CPU (central processing unit) record pulse, then performs step S1;
CPU (central processing unit) calculates total flow according to the overall pulse number flowmeter corresponding with each pulse of record.
CPU (central processing unit) excites LC oscillatory circuit work method once to comprise the following steps by energizing circuit: the first output terminal of CPU (central processing unit) exports high level, energizing circuit produces high level and charges to LC oscillatory circuit, after the charging complete of LC oscillatory circuit, first output terminal output low level of CPU (central processing unit), energizing circuit output low level is stopped power supply, and LC oscillatory circuit starts vibration.
The acquisition methods of waveform die-away time comprises the following steps: in CPU (central processing unit) record waveform, voltage is higher than the time of setting value K, and this time value is the die-away time of waveform.
Setting value D is non-magnetic flowmeter amount device marking the half of the longest die-away time when testing under condition with difference the shortest die-away time.
Non-magnetic flowmeter amount device at different temperatures, envelope detection circuit output waveform the shortest die-away time M and the longest die-away time N can change to some extent, but the difference between the shortest die-away time M and the longest die-away time N is substantially constant, setting value D is non-magnetic flowmeter amount device marking the half of the longest die-away time when testing under condition with difference the shortest die-away time.This method detect in real time renewal M the shortest die-away time and the longest die-away time N, when impeller face below LC oscillatory circuit turns to the intersection of conductive region and insulating regions, die-away time be the up-to-date M the shortest die-away time recorded add setting value D or the longest die-away time N deduct setting value D.Therefore, when impeller face below LC oscillatory circuit rotates to insulating regions from conductive region, the value that current attenuation time T1 deducts M up-to-date the shortest die-away time is greater than setting value D, when impeller face below LC oscillatory circuit rotates to conductive region from insulating regions, the value that up-to-date the longest die-away time, N deducted current attenuation time T1 is greater than setting value D.This method adopts difference as examination criteria, can overcome high/low temperature change to the impact detected, still can normally work in the environment that temperature variation is larger, and without the need to calibration when using.
Claims (10)
1. a non-magnetic flowmeter amount device, comprise housing, impeller (6) and pick-up unit is provided with in described housing, it is characterized in that: described pick-up unit comprises CPU (central processing unit) (1), energizing circuit (2), voltage lifting circuit (3), LC oscillatory circuit (4) and envelope detection circuit (5), first output terminal of described CPU (central processing unit) (1) is electrically connected with the input end of energizing circuit (2), second output terminal of described CPU (central processing unit) (1) is electrically connected with the input end of voltage lifting circuit (3), the output terminal of described energizing circuit (1) and the output terminal of voltage lifting circuit (3) are electrically connected with the input end of LC oscillatory circuit (4), the output terminal of described LC oscillatory circuit (4) is electrically connected with the input end of envelope detection circuit (5), the output terminal of described envelope detection circuit (5) is electrically connected with the input end of CPU (central processing unit) (1), described LC oscillatory circuit (4) is arranged on the top of impeller (6), described impeller (6) is towards the one side of LC oscillatory circuit (4), half is the insulating regions (8) that insulating material is made, second half is the conductive region (7) that conductive material is made.
2. a kind of non-magnetic flowmeter amount device according to claim 1, it is characterized in that: described energizing circuit (2) comprises diode D1 and resistance R1, the positive pole of diode D1 is electrically connected with the first output terminal of CPU (central processing unit) (1), the negative pole of diode D1 is electrically connected with resistance R1 one end, and the resistance R1 other end is electrically connected with the input end of LC oscillatory circuit (4).
3. a kind of non-magnetic flowmeter amount device according to claim 1, it is characterized in that: described voltage lifting circuit (3) comprises resistance R2, resistance R3 and electric capacity C1, resistance R2 one end is electrically connected with the second output terminal of CPU (central processing unit) (1), the input end of the resistance R2 other end and resistance R3 one end, electric capacity C1 one end and LC oscillatory circuit (4) is electrically connected, the resistance R3 other end and the electric capacity C1 other end all ground connection.
4. a kind of non-magnetic flowmeter amount device according to claim 1 or 2 or 3, is characterized in that: described LC oscillatory circuit (4) comprises electric capacity C2 and inductance L 1, described electric capacity C2 and inductance L 1 parallel connection.
5. a kind of non-magnetic flowmeter amount device according to claim 1 or 2 or 3, it is characterized in that: described envelope detection circuit (5) comprises diode D2, resistance R4, resistance R5 and electric capacity C3, diode D2 positive pole is electrically connected with the output terminal of LC oscillatory circuit (4), diode D2 negative pole is electrically connected with resistance R4 one end, the input end of the resistance R4 other end and electric capacity C3 one end, resistance R5 one end and CPU (central processing unit) (1) is electrically connected, the electric capacity C3 other end and the resistance R5 other end all ground connection.
6. a kind of non-magnetic flowmeter amount device according to claim 1 or 2 or 3, it is characterized in that: described housing is provided with wireless communication module (9), described wireless communication module (9) is electrically connected with CPU (central processing unit) (1).
7. a metering method for non-magnetic flowmeter amount device, is applicable to a kind of non-magnetic flowmeter amount device as described in claim arbitrary in claim 1-6, it is characterized in that, comprise the following steps:
S1: CPU (central processing unit) empties the M the shortest die-away time of storage;
S2: CPU (central processing unit) excites the work of LC oscillatory circuit once by energizing circuit, LC oscillatory circuit exports waveform, waveform outputs to the input end of CPU (central processing unit) after envelope detection circuit process, and CPU (central processing unit) obtains the current attenuation time T1 of envelope detection circuit output waveform;
S3: CPU (central processing unit) judges to store the shortest die-away time, whether the value of M was empty, if so, then by the shortest die-away time M value change to this current die-away time of T1, then perform step S2, otherwise perform step S4;
S4: CPU (central processing unit) judges whether current attenuation time T1 is less than M the shortest die-away time, if so, then by the shortest die-away time M value change to this current die-away time of T1, then perform step S2, otherwise perform step S5;
S5: CPU (central processing unit) judges whether the value that current attenuation time T1 deducts M the shortest die-away time is greater than setting value D, i.e. whether T1-M > D, if it is show that the impeller face below LC oscillatory circuit rotates to insulating regions from conductive region, perform step S6, otherwise perform step S2;
S6: CPU (central processing unit) record pulse, then empties the N the longest die-away time of storage;
S7: CPU (central processing unit) excites the work of LC oscillatory circuit once by energizing circuit, LC oscillatory circuit exports waveform, waveform outputs to the input end of CPU (central processing unit) after envelope detection circuit process, and CPU (central processing unit) obtains the current attenuation time T1 of envelope detection circuit output waveform;
S8: CPU (central processing unit) judges to store the longest die-away time, whether the value of N was empty, if so, then by the longest die-away time N value change to this current die-away time of T1, then perform step S7, otherwise perform step S9;
S9: CPU (central processing unit) judges whether current attenuation time T1 is greater than N the longest die-away time, if so, then by the longest die-away time N value change to this current die-away time of T1, then perform step S7, otherwise perform step S10;
S10: whether the value that CPU (central processing unit) judgement N the longest die-away time deducts current attenuation time T1 is greater than setting value D, i.e. whether N-T1 > D, if it is show that the impeller face below LC oscillatory circuit rotates to conductive region from insulating regions, perform step S11, otherwise perform step S7;
S11: CPU (central processing unit) record pulse, then performs step S1;
CPU (central processing unit) calculates total flow according to the overall pulse number flowmeter corresponding with each pulse of record.
8. the metering method of a kind of non-magnetic flowmeter amount device according to claim 7, it is characterized in that, described CPU (central processing unit) excites LC oscillatory circuit work method once to comprise the following steps by energizing circuit: the first output terminal of CPU (central processing unit) exports high level, energizing circuit produces high level and charges to LC oscillatory circuit, after the charging complete of LC oscillatory circuit, first output terminal output low level of CPU (central processing unit), energizing circuit output low level is stopped power supply, and LC oscillatory circuit starts vibration.
9. the metering method of a kind of non-magnetic flowmeter amount device according to claim 7, it is characterized in that, the acquisition methods of described waveform die-away time comprises the following steps: in CPU (central processing unit) record waveform, voltage is higher than the time of setting value K, and this time value is the die-away time of waveform.
10. the metering method of a kind of non-magnetic flowmeter amount device according to claim 7 or 8 or 9, is characterized in that: described setting value D is non-magnetic flowmeter amount device marking the half of the longest die-away time when testing under condition with difference the shortest die-away time.
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| CN109029593A (en) * | 2018-10-17 | 2018-12-18 | 矽力杰半导体技术(杭州)有限公司 | Turbine flowmeter and flow rate testing methods |
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