CN210833696U - Intelligent electromagnetic flowmeter - Google Patents
Intelligent electromagnetic flowmeter Download PDFInfo
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- CN210833696U CN210833696U CN201920973298.2U CN201920973298U CN210833696U CN 210833696 U CN210833696 U CN 210833696U CN 201920973298 U CN201920973298 U CN 201920973298U CN 210833696 U CN210833696 U CN 210833696U
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Abstract
The utility model discloses an intelligent electromagnetic flowmeter, including power module, sensor part, excitation system and signal self-modulation system, signal self-modulation system is by excitation control module, signal amplification module, voltage excitation control module and constitutes, power module for intelligent electromagnetic flowmeter provides the power, electromagnetic flowmeter concrete operation method is through quick adjustment exciting current, makes excitation system get into the constant current excitation state fast, and the induced magnetic field gets into steady state value, obtains stable flow signal; the utility model provides a self-diagnosis processing method can realize the automatic tracking at zero point to eliminate in the measurement, the electrode receives the measuring error who pollutes and produce often, overcomes flow noise etc. thereby improves electromagnetic flowmeter's measurement accuracy, has avoided causing the unsafe condition of measurement because drift at zero point, blank pipe, electrode pollution etc..
Description
Technical Field
The utility model belongs to the technical field of the electromagnetic flow detects, concretely relates to intelligence electromagnetic flowmeter.
Background
An electromagnetic flowmeter based on Faraday's law of electromagnetic induction, in which the measured conductive fluid in the measuring tube cuts the magnetic force line laterally to generate induced electromotive force, and outputs the induced electromotive force through an electrode, because the sensor of the electromagnetic flowmeter has the advantages of simple structure, non-invasive type, no blocking device and the like, the electromagnetic flowmeter is often used in the industries of petroleum gas, chemical water treatment, pharmacy, food and beverage, energy metallurgy, paper pulp treatment, building materials and the like, meanwhile, the electromagnetic flowmeter is a device with performance strongly dependent on the use condition, in the field actual measuring environment, the precision of the meter can be influenced by various factors such as the stability of a medium, the pressure, the bubble content and the like, the actual meter has certain system errors, random errors and the like, in addition, the factors such as electrode pollution, noise and the like in the measuring process can influence the measuring precision, the zero point of the electromagnetic flowmeter refers to the flow value measured when the fluid, under an ideal condition, the flowmeter should display zero flow, the zero point is generally calibrated again in use, but the zero point is unstable due to system errors, random errors, external interference signals and the like in actual use of the flowmeter, and the measurement precision is further influenced.
At present, few means for solving the problems at home and abroad are used, errors (zero drift generated) superposed in flow rate signals are basically filtered through capacitors, the signal frequency of the electromagnetic flowmeter is low and is generally below 6.25Hz, the used capacitor value is required to be large, so that the charge-discharge time constant of the capacitors is large, and meanwhile, the capacitors have the charge-discharge process and can cause the distortion of the flow rate signals.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve the unsafe problem of measurement that causes because drift at zero point, blank pipe, electrode pollution etc. that present electromagnetic flowmeter exists, provide an improve electromagnetic flowmeter's measurement accuracy's self diagnosis processing method.
In order to achieve the above object, the utility model provides a following technical scheme: an intelligent electromagnetic flowmeter has self-regulating intelligence in the aspect of processing flow signals and noise, and the measurement performance and anti-interference capability of the flowmeter are improved newly, wherein the performance of the flowmeter is strongly dependent on the use condition, so that the research of a signal processing method must be based on the analysis of the characteristics of the signals and the noise.
Furthermore, the flow noise of the electromagnetic flowmeter is in inverse proportion to the excitation frequency, and the higher the excitation frequency is, the smaller the influence of the flow noise on the flow signal is; on the contrary, the lower the excitation frequency is, the greater the influence of the flow noise on the flow signal is; the influence of flow noise can be easily overcome by increasing the excitation frequency, but the negative influence brought by increasing the excitation frequency is that the influence of differential interference on flow signals is enhanced, the adjustment capability of the zero point of the electromagnetic flowmeter is reduced, and the time for the magnetic field to reach a steady state is shortened.
Furthermore, the intelligent electromagnetic flowmeter achieves self-correction of the detected flow velocity signal by adjusting the exciting current through a sensor and a signal processing technology. And secondly, adjusting excitation to a stable state according to the inverse proportional relation between the excitation frequency and the flow noise so as to overcome the flow noise.
Further, an excitation module in the intelligent electromagnetic flowmeter rapidly increases the excitation current I at the initial excitation to reach a current value Ic required by the excitation module, so that stable excitation is realized; the excitation system adopts a switchable bypass switch operated by a control signal K and connected in parallel at two ends of a controller Ic of current excitation, and at an initial time T0 when a current I starts to exist in an excitation coil, a control unit outputs a signal K to switch on the bypass switch, so that the current I in an excitation module quickly rises and the excitation of the excitation coil is quickly enhanced; when the current I in the exciting coil approaches to the current value Ic set by the current controller, the control unit outputs a control signal K to turn off the bypass switch, and the current controller enables the current I flowing through the exciting coil to be rapidly controlled at the current value Ic, so that the rapid excitation control of the exciting coil is realized.
Further, the excitation system comprises a power supply with a voltage V value, a current controller which enables the current I flowing through the two ends A and B to be set at a current value Ic, an excitation unit, a control unit, a sampling resistor R and a monitoring unit; the DC power supply, the A and B ends of the current controller and the excitation unit are connected into a series loop; the excitation unit is formed by connecting an excitation switch and an excitation coil in series, the sampling resistor is fed back to the control unit through the monitoring unit, the control unit outputs a control signal C to operate the on and off of the excitation switch, and the on and off operation of the excitation switch determines the on and off of a series loop, namely the current I in the excitation coil; a bypass switch operated by a control signal K is connected in parallel with the two ends A and B of the current controller, and the on and off of the bypass switch are operated by the control signal K output by the control unit.
Furthermore, the power supply consists of a high-voltage power supply, a low-voltage power supply and an alternative switch; the high-voltage power supply and the low-voltage power supply are respectively connected with two input selective joints of the alternative switch, and the control unit is connected with the control joint of the alternative switch to control the connection and the disconnection of the two input selective joints.
Furthermore, the excitation unit is that excitation coil connects an excitation switch in series, the excitation switch comprises an upper left switch, a lower left switch, an upper right switch and a lower right switch, one end of the excitation coil is connected with the output end of the upper left switch and the input end of the lower left switch, the other end of the excitation coil is connected with the output end of the upper right switch and the input end of the lower right switch, the upper left switch is connected with the input end of the upper right switch to serve as the input end of the excitation unit, and the lower left switch is connected with the output end of the lower right switch to serve as the output end of the excitation unit.
Further, in the intelligent electromagnetic flowmeter, in the measuring process, when the exciting current reaches Ic, the working period of the exciting current I =0 is increased, and when the induced magnetic field B =0, the induced electromotive force E =0 is obtained, the signal passing through the output of the signal amplifying unit at this time is taken as a zero point value Z, and the Z value at this time is recorded. And correcting the induced electromotive force signal E obtained in the measurement process, so that the accurate estimation of the value of the flow velocity V is realized.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a self-diagnosis processing method can realize the automatic tracking at zero point to eliminate in the measurement, the electrode receives the measuring error who pollutes and produce often, overcomes flow noise etc. thereby improves electromagnetic flowmeter's measurement accuracy.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of the design of an intelligent electromagnetic flowmeter;
FIG. 2 is a diagram of an intelligent electromagnetic flowmeter;
FIG. 3 is a fast-adjusting energizing unit;
FIG. 4 illustrates a DC power supply and control unit;
fig. 5 shows an excitation unit and a control unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Example one
Referring to fig. 1, the present intelligent electromagnetic flowmeter includes: c is an excitation coil, E1 and E2 are electrodes, 1 is a sensor, 2 is a magnetic field excitation control module, 3 is a signal amplification module, and 4 is a voltage excitation control module. The method comprises the steps that an exciting current I =0 working period is added continuously in the process of flow measurement, when I =0, namely a magnetic field B =0, induced electromotive force E =0 of the flow velocity, a signal passing through a signal amplification module at the moment is used as a zero point value Z, and an induced electromotive force signal E measured under the magnetic field B is corrected, so that accurate estimation of a value of the flow velocity V is achieved.
Example two
Referring to fig. 2 to 5, the power module uses a transformer-type switching power supply to provide the required operating voltage and current for each module of the whole system; the excitation module provides a stable working magnetic field for the sensor under the control of the microprocessor; the flow signal detected by the sensor is firstly amplified and filtered by a front-stage instrument amplifier to obtain a differential flow signal, and then the flow signal is further amplified and filtered by a baseline type feedback amplification circuit; and the amplified and adjusted signals are subjected to quantization processing through a V/F conversion circuit, and finally sampling and calculation are carried out through the MCU to obtain flow signals.
FIG. 3 is a diagram of a fast-adjusting excitation unit, which includes a DC power supply having a voltage V, a controller for setting a current I flowing between A and B at a current Ic, an excitation unit, a control unit, a sampling resistor R, and a monitoring unit; the DC power supply, the A and B ends of the constant current controller and the excitation unit are connected into a series loop; the excitation unit is formed by connecting an excitation switch and an excitation coil in series, the sampling resistor is fed back to the control unit through the monitoring unit, the control unit outputs a control signal C to operate the on and off of the excitation switch, and the on and off operation of the excitation switch determines the on and off of a series loop, namely the current I in the excitation coil; a bypass switch operated by a control signal K is connected in parallel with the two ends A and B of the constant current controller, and the bypass switch is switched on and off and operated by the control signal K output by the control unit.
In this embodiment, preferably, at a time T0 when the current I =0 in the series circuit, i.e., the exciting coil, the control signal X output by the control unit operates the alternative switch to make the high-voltage power supply output as the dc power supply, and the rising rate of the loop current I is made faster by the high-voltage power supply; the control signal C and the control signal K output by the control unit enable the excitation switch and the bypass switch to be switched on, and the current I passes through the bypass switch and is not controlled by the constant current controller, so that the current I in a series circuit, namely the excitation coil, is increased at the fastest speed. The voltage monitoring unit measures voltage Vr at two ends of the sampling resistor, when Vr/R = I is close to the T1 moment of the constant current value Ic of the constant current controller, the voltage monitoring unit triggers the control unit to output a control signal K to turn off the bypass switch by using an output signal F, the control signal X output by the control unit operates the alternative switch to enable the low-voltage power supply to serve as the output of the direct-current power supply, and the voltage drop of the constant current controller is reduced by using the low-voltage power supply. At this time, the constant current controller makes the current I in the exciting coil in the series circuit controlled at the constant current value Ic quickly, so that the exciting coil enters the constant current excitation state.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. An intelligent electromagnetic flowmeter, characterized in that: the signal self-adjusting system is composed of an excitation control module, a signal amplification module and a voltage excitation control module, and the power module provides a power supply for the intelligent electromagnetic flowmeter.
2. The intelligent electromagnetic flowmeter of claim 1, wherein: the excitation system comprises a direct current power supply with a voltage V value, a current controller which enables the current I flowing through the two ends A and B to be set at a current value Ic, an excitation unit, a control unit, a sampling resistor R and a monitoring unit; the direct current power supply, the ends A and B of the current controller and the excitation unit are connected into a series loop.
3. The intelligent electromagnetic flowmeter of claim 2, wherein: the excitation unit is formed by connecting an excitation switch and an excitation coil in series, a sampling resistor is fed back to the control unit through the monitoring unit, the control unit outputs a control signal C to operate the on and off of the excitation switch, and the on and off operation of the excitation switch determines a series loop, namely the on and off of a current I in the excitation coil; a bypass switch operated by a control signal K is connected in parallel with the two ends A and B of the current controller, and the bypass switch is switched on and off and operated by the control signal K output by the control unit.
4. The intelligent electromagnetic flowmeter of claim 3, wherein: the excitation switch comprises an upper left switch, a lower left switch, an upper right switch and a lower right switch, the output of the upper left switch and the input of the lower left switch are connected to the one end of excitation coil, the output of the upper right switch and the input of the lower right switch are connected to the other end of excitation coil, the upper left switch is connected with the input of the upper right switch and serves as the input of the excitation unit, and the lower left switch is connected with the output of the lower right switch and serves as the output of the excitation unit.
5. The intelligent electromagnetic flowmeter of claim 4, wherein: the excitation system adopts the mode that two ends of the current controller Ic are connected with the bypass switch which can be switched on and off by being operated by a control signal K in parallel, and at the initial time T0 when the current I starts to exist in the excitation coil, the control unit outputs a signal K to switch on the bypass switch, so that the current I in the excitation unit is quickly increased, and the excitation of the excitation coil is quickly enhanced; when the current I in the exciting coil approaches to the current value Ic set by the current controller, the control unit outputs a control signal K to turn off the bypass switch, and the current controller enables the current I flowing through the exciting coil to be rapidly controlled at the current value Ic, so that the rapid excitation control of the exciting coil is realized.
6. The intelligent electromagnetic flowmeter of claim 5, wherein: the magnetic field generated by the exciting coil is perpendicular to the flowing direction V of the fluid in the measuring tube, and the measuring tube is provided with a pair of electrodes E1 and E2, and the direction of the magnetic field generated by the exciting coil is perpendicular to the flowing direction of the fluid in the measuring tube and the flowing direction of the fluid in the measuring tube.
7. The intelligent electromagnetic flowmeter of claim 1, wherein: the power module is composed of a high-voltage power supply, a low-voltage power supply and an alternative switch, the high-voltage power supply and the low-voltage power supply are respectively connected with two input selection joints of the alternative switch, and the control unit is connected with a control joint of the alternative switch and controls the connection and disconnection of the two input selection joints.
8. The intelligent electromagnetic flowmeter of claim 1, wherein: in the process of measuring flow, the intelligent electromagnetic flowmeter enables an excitation current I of an excitation unit in an excitation system to be 0, namely a magnetic field B to be 0, at the moment, an induced electromotive force E of a measured fluid to be 0, at the moment, a signal output by the signal amplification module serves as a zero point value Z, and an induced electromotive force signal E measured under the magnetic field B is corrected, so that the accurate estimation of a flow velocity V value is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920973298.2U CN210833696U (en) | 2019-06-26 | 2019-06-26 | Intelligent electromagnetic flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920973298.2U CN210833696U (en) | 2019-06-26 | 2019-06-26 | Intelligent electromagnetic flowmeter |
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| CN210833696U true CN210833696U (en) | 2020-06-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207768A (en) * | 2019-06-26 | 2019-09-06 | 上海市计量测试技术研究院 | A kind of intelligent electromagnetic flowmeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110207768A (en) * | 2019-06-26 | 2019-09-06 | 上海市计量测试技术研究院 | A kind of intelligent electromagnetic flowmeter |
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Granted publication date: 20200623 Termination date: 20210626 |