Intermittent excitation electromagnetic flowmeter and control methodTechnical field
Patent of the present invention relates to a kind of electromagnetic flowmeter, a kind ofly specifically by intelligent converter, controls excitation actuating, carries out cyclical intermission formula excitation, realizes the electromagnetic flowmeter powered by battery of low-power consumption.
Background technology
Powered battery type electromagnetic flowmeter for liquid flow measurement is all that free of discontinuities formula is carried out excitation at present, and battery is the bottleneck of this class flowmeter.The present invention adopts intermittent excitation, realizes low-power consumption, in the situation that battery initial capacity is set, guarantees that battery can obtain longer serviceable life.
Summary of the invention
Patent design of the present invention be a kind of intermittent excitation electromagnetic flowmeter and control method, when solving electromagnetic flowmeter and carrying out excited work, need the consumption of electric energy, cause the problem of battery electric quantity waste.
The object of the invention is to be achieved through the following technical solutions.
Intermittent excitation electromagnetic flowmeter, comprise data acquisition end, intelligent converter, control module, comparer and frequency control unit, described data acquisition end is connected with intelligent converter, intelligent converter is connected to control module, and described control module is connected with comparer respectively at frequency control unit.
Data acquisition end sends to comparer by the data of collection, and control module is for the result of comparer, controlled frequency control module, and then change the sample frequency of data acquisition end.
The control method of described intermittent excitation battery flowmeter, comprise, the normality scope of control module setting data collection terminal image data and the critical value of image data change frequency, and by described normality scope and described critical value assignment to comparer, described frequency control unit is set normality sample frequency and abnormal sample frequency, normality sample frequency is less than abnormal sample frequency, and the sampling data transmitting of described data acquisition end is given comparer
First judge that sampled data is whether within the scope of normality, if surpass the upper limit of normality scope or lower than the lower limit of normality scope, switch to abnormal sample frequency by control module controlled frequency control module;
Then judge that whether sampled data change frequency surpasses critical value, if surpass critical value, switches to abnormal sample frequency by control module controlled frequency control module.
Like this, sampled data within the scope of normality time, can make frequency control unit control sample frequency in normality sample frequency, because normality sample frequency is less than abnormal sample frequency, so can comparatively significantly save the electric weight of battery.
The present invention can require converter arrange according to flow accuracy, controls unit by the detecting of data on flows, analysis, can automatically control excitation off time, and more stabilization of excitation time slot is longer for flow.Its advantage is by intermittent excitation, realizes excitation low-power consumption, in the situation that battery initial capacity is set, guarantees that battery can obtain longer serviceable life, thereby has improved the performance of electromagnetic flowmeter powered by battery, makes it preferably in the use without civil power region.
The present invention is owing to the free of discontinuities formula excitation of original powered battery type electromagnetic flowmeter being improved to periodically intermittent excitation, realized low-power consumption, further solved the impact of battery capacity problem on the work of the type flowmeter, so the gap electromagnetic flowmeter powered usable range of excitation-type intelligent battery is wider, adaptability is stronger.
Accompanying drawing explanation
According to drawings and embodiments the present invention is described in further detail below.
Fig. 1 is the modular structure figure of intermittent excitation electromagnetic flowmeter of the present invention.
Fig. 2 is the control design sketch of intermittent excitation electromagnetic flowmeter of the present invention.
Embodiment
As shown in Figure 1, intermittent excitation electromagnetic flowmeter of the present invention, comprise data acquisition end, intelligent converter, control module, comparer and frequency control unit, described data acquisition end is connected with intelligent converter, intelligent converter is connected to control module, and described control module is connected with comparer respectively at frequency control unit.
Data acquisition end sends to comparer by the data of collection, and control module is for the result of comparer, controlled frequency control module, and then change the sample frequency of data acquisition end.
As shown in Figure 2, Tu Zhong A district flow is normal, excitation time 1 second, Tu Zhong B district fluctuations in discharge soon but not super setting value, excitation time 1/4 second, the super setting value excitation time of Tu Zhong C district flow 1/4 second, Tu Zhong D district flow was lower than setting value excitation time 1/4 second.
The control method of described intermittent excitation battery flowmeter, comprise, the normality scope of control module setting data collection terminal image data and the critical value of image data change frequency, and by described normality scope and described critical value assignment to comparer, described frequency control unit is set normality sample frequency and abnormal sample frequency, normality sample frequency is less than abnormal sample frequency, and the sampling data transmitting of described data acquisition end is given comparer
First judge that sampled data is whether within the scope of normality, if surpass the upper limit of normality scope or lower than the lower limit of normality scope, switch to abnormal sample frequency by control module controlled frequency control module;
Then judge that whether sampled data change frequency surpasses critical value, if surpass critical value, switches to abnormal sample frequency by control module controlled frequency control module.
Like this, sampled data within the scope of normality time, can make frequency control unit control sample frequency in normality sample frequency, because normality sample frequency is less than abnormal sample frequency, so can comparatively significantly save the electric weight of battery.
The present invention can require converter arrange according to flow accuracy, controls unit by the detecting of data on flows, analysis, can automatically control excitation off time, and more stabilization of excitation time slot is longer for flow.Its advantage is by intermittent excitation, realizes excitation low-power consumption, in the situation that battery initial capacity is set, guarantees that battery can obtain longer serviceable life, thereby has improved the performance of electromagnetic flowmeter powered by battery, makes it preferably in the use without civil power region.
The present invention is owing to the free of discontinuities formula excitation of original powered battery type electromagnetic flowmeter being improved to periodically intermittent excitation, realized low-power consumption, further solved the impact of battery capacity problem on the work of the type flowmeter, so the gap electromagnetic flowmeter powered usable range of excitation-type intelligent battery is wider, adaptability is stronger.