CN204064355U - A kind of residual magnetism excitation electromagnetic flowmeter - Google Patents
A kind of residual magnetism excitation electromagnetic flowmeter Download PDFInfo
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- CN204064355U CN204064355U CN201420363135.XU CN201420363135U CN204064355U CN 204064355 U CN204064355 U CN 204064355U CN 201420363135 U CN201420363135 U CN 201420363135U CN 204064355 U CN204064355 U CN 204064355U
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- iron core
- field coil
- excitation
- residual magnetism
- bushing pipe
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Abstract
The utility model relates to a kind of residual magnetism excitation electromagnetic flowmeter, comprise electrode, bushing pipe, Circuits System, field coil and iron core, described electrode is provided with two, described two distribution of electrodes are on described bushing pipe, and described two electrodes are connected respectively by the signal input part of wire with described Circuits System, described field coil is provided with two, be respectively the first field coil, second field coil, the described iron core of surrounding that described first field coil and the second field coil are distributed in described bushing pipe is provided with two, be respectively the first iron core and the second iron core, described first iron core is provided with in described first field coil, described second iron core is provided with in described second field coil, described first iron core and the second iron core are the soft-magnetic body with hysteresis.The utility model is magnetized by coil and changes core field direction, and iron core remanent magnetism produces the excitation mode of operating fields, and the power consumption significantly can saving excitation is of great importance for reducing electromagnetic flowmeter Overall Power Consumption.
Description
Technical field
The utility model relates to a kind of electromagnetic flowmeter, is specifically related to a kind of residual magnetism excitation electromagnetic flowmeter.
Background technology
Electromagnetic flowmeter is that a kind of foundation Faraday's electromagnetic induction law is to measure the instrument of conducting liquid volumetric flow rate.Apply magnetic field flowing on vertical direction with conducting liquid, conducting liquid does cutting magnetic line movement and produces induced electromotive force signal.Calculate the flow velocity of fluid by detecting induced electromotive force signal and carrying out corresponding signal transacting thus realize flow measurement accurately.
Along with the development of electromagnetic flowmeter technology, successively there is permanent magnet excitation and the large class excitation mode of coil magnetization two in electromagnetic flowmeter excitation mode.Coil magnetization mode comprises: power frequency sine wave excitation (being called for short power frequency excitation), single-frequency alternation DC pulse square-wave excitation (being called for short: single-frequency excitation), double frequency alternation DC pulse square-wave excitation (abbreviation dual-frequency excitation) and multifrequency alternation DC pulse square-wave excitation (being called for short multifrequency excitation).Single-frequency excitation is generally adopted in current application.Be power frequency excitation, single-frequency excitation, dual-frequency excitation or multifrequency excitation be all that the magnetic field produced in coil by exciting current provides electromagnetic flowmeter operating fields by the constant exciting current of the applying of alternately change regular in coil.Namely the source of operating fields is the magnetic field that field coil produces, if electric current is once namely disappearance operating fields disappears in field coil.
Permanent magnet excitation: adopt permanent magnet to provide the excitation mode of operating fields for electromagnetic flowmeter.This excitation mode, because adopting the magnetic field of permanent magnet generation as electromagnetic flowmeter operating fields, does not use coil so without any excitation power consumption.Excitation power consumption is minimum, but permanent magnet excitation can not change because of magnetic field, causes producing the direction of induction electromotive force and can not change produce polarization phenomena on the electrode of Received signal strength, thus cause distorted signals, cannot Measurement accuracy and limit to very large.Therefore permanent magnet excitation mode does not use on electromagnetic flowmeter.
Coil magnetization: adopt the electric current that to pass into the regular alternately change of direction of current in coil to provide the excitation mode of operating fields for electromagnetic flowmeter.Magnetic direction in coil magnetization is change alternately, consequent induction electromotive force is alternately change also, therefore polarization phenomena can not be produced above the electrode accepting induced signal, but the maintenance of operating fields relies on the exciting current in coil completely, therefore for realizing stable operating fields and obtaining stable signal, the power consumption consumed maintaining exciting current is very large, occupies the major part of electromagnetic flowmeter power consumption, its excitation power consumption is large, thus increases the Overall Power Consumption of electromagnetic flowmeter.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of residual magnetism excitation electromagnetic flowmeter, significantly can reduce electromagnetic flowmeter excitation power consumption, reduces electromagnetic flowmeter Overall Power Consumption.
The technical scheme that the utility model solves the problems of the technologies described above is as follows: a kind of residual magnetism excitation electromagnetic flowmeter, comprise electrode, bushing pipe, Circuits System, field coil and iron core, described electrode is provided with two, described two distribution of electrodes are on described bushing pipe, and described two electrodes are connected respectively by the signal input part of wire with described Circuits System, described field coil is provided with two, be respectively the first field coil, second field coil, the described iron core of surrounding that described first field coil and the second field coil are distributed in described bushing pipe is provided with two, be respectively the first iron core and the second iron core, described first iron core is provided with in described first field coil, described second iron core is provided with in described second field coil, described first iron core and the second iron core are the soft-magnetic body with hysteresis, one end of described first field coil is connected by wire with one end of the second field coil, the other end of described first field coil is connected by be connected with the exciting current output terminal of the described Circuits System exciting current output terminal of described Circuits System of wire.
On the basis of technique scheme, the utility model can also do following improvement.
Further, described bushing pipe is annulus tubular structure, and described two electrodes are distributed on described bushing pipe along described bushing pipe axis is centrosymmetric.
Further, described first field coil and the first iron core form the first residual magnetism excitation mechanism, described second field coil and the second iron core form the second residual magnetism excitation mechanism, described first residual magnetism excitation mechanism and the second residual magnetism excitation mechanism are distributed in around described bushing pipe along described bushing pipe axis is centrosymmetric, and the axis at described first residual magnetism excitation mechanism and the second residual magnetism excitation mechanism place and the axis at two electrode places perpendicular.
The beneficial effects of the utility model are: residual magnetism excitation technology of the present utility model is the excitation technology of a kind of integrated coil excitation and residual magnetism excitation advantage, magnetized by coil and change core field direction, iron core remanent magnetism produces the excitation mode of operating fields, and the power consumption significantly can saving excitation is of great importance for reducing electromagnetic flowmeter Overall Power Consumption; Simultaneously because providing constant exciting current without the need to continuing, significantly reducing the working load of field circuit, adding the mission life of field circuit, also simplify the design of field circuit, while reducing field circuit cost, adding the reliability of circuit.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of residual magnetism excitation electromagnetic flowmeter of the utility model;
Fig. 2 is exciting current and the operating fields waveform comparison diagram of the coil magnetization mode of a kind of residual magnetism excitation electromagnetic flowmeter of the utility model;
Fig. 3 is exciting current and the operating fields waveform comparison diagram of the residual magnetism excitation mode of a kind of residual magnetism excitation electromagnetic flowmeter of the utility model;
Fig. 4 is the graph of a relation of magnetic field in the iron core of a kind of residual magnetism excitation electromagnetic flowmeter of the utility model and magnetic induction;
Fig. 5 be a kind of residual magnetism excitation electromagnetic flowmeter of the utility model represent by electric current and iron-core magnetic induction intensity the excitation procedure chart that iron core is magnetized.
In accompanying drawing, the list of parts representated by each label is as follows:
1, electrode, 2, bushing pipe, 3, Circuits System, the 4.1, first field coil, the 4.2, second field coil, the 5.1, first iron core, the 5.2, second iron core.
Embodiment
Be described principle of the present utility model and feature below in conjunction with accompanying drawing, example, only for explaining the utility model, is not intended to limit scope of the present utility model.
As shown in Figure 1, a kind of residual magnetism excitation electromagnetic flowmeter, comprise electrode 1, bushing pipe 2, Circuits System 3, field coil and iron core, described electrode 1 is provided with two, described bushing pipe 2 is annulus tubular structure, and described two electrodes 1 are distributed on described bushing pipe 2 along the centrosymmetric of described bushing pipe 2.And described two electrodes 1 are connected respectively by the signal input part of wire with described Circuits System 3, described field coil is provided with two, be respectively the first field coil 4.1, second field coil 4.2, described first field coil 4.1 and the second field coil 4.2 are distributed in described bushing pipe 2 around, described iron core is provided with two, be respectively the first iron core 5.1 and the second iron core 5.2, described first iron core 5.1 is provided with in described first field coil 4.1, described second iron core 5.2 is provided with in described second field coil 4.2, described first iron core 5.1 and the second iron core 5.2 are the soft-magnetic body with hysteresis, one end of described first field coil 4.1 is connected by wire with one end of described second field coil 4.2, the other end of described first field coil 4.1 is connected by the exciting current output terminal of wire with described Circuits System 3, described first field coil 4.1 and the first iron core 5.1 form the first residual magnetism excitation mechanism, described second field coil 4.2 and the second iron core 5.2 form the second residual magnetism excitation mechanism, described first residual magnetism excitation mechanism and the second residual magnetism excitation mechanism are distributed in around described bushing pipe along described bushing pipe 2 axis is centrosymmetric, and the axis at described first residual magnetism excitation mechanism and the second residual magnetism excitation mechanism place and the axis at two electrode 1 places perpendicular.
Principle of work of the present utility model is the excitation technology of a kind of integrated coil excitation and residual magnetism excitation advantage, exciting current is provided to field coil by Circuits System, magnetized by field coil and change core field direction, iron core remanent magnetism produces the excitation mode of operating fields, and field coil only provides the mode of operation of the electric current that magnetizes to add that field coil stops providing when exciting current providing the mode of operation of operating fields to constitute exclusive excited work mode by the remanent magnetism of iron core when changing core field direction; Electromagnetic flowmeter sends by electrode the fluid flow information detected to Circuits System, draws the uninterrupted of liquid.The principle of work of a kind of residual magnetism excitation electromagnetic flowmeter of the present utility model and coil magnetization has a great difference, under coil magnetization mode, exciting current and operating fields are synchronous, namely operating fields is produced by exciting current, produce operating fields and must consume exciting current, as shown in Figure 2, coil magnetization mode coil needs lasting exchange current to come maintenance work magnetic field for the exciting current of its coil magnetization mode and operating fields waveform comparison diagram; Under residual magnetism excitation mode, operating fields is asynchronous with exciting current, operating fields is provided by the remanent magnetism of iron core, the generation of operating fields does not rely on the exciting current in coil, only carry out the process that magnetizes to need momently to consume the exciting current in coil when changing iron core remanence direction, for generation of of short duration field of magnetizing, the exciting current of its residual magnetism excitation mode and operating fields waveform comparison diagram are as shown in Figure 3.Residual magnetism excitation mode, only needs just to need to consume exciting current, so just significantly can reduce the power consumption of field circuit when reversing the direction of (change) remanent magnetic field.
The process that iron core magnetizes is:
Forward excitation: along with the increase of exciting current in field coil when excitation, the magnetic field H in iron core
c(being produced by exciting current) and magnetic induction B
cthe relation of (iron core produce induced field) as shown in Figure 4, time field coil electric current is zero, the point (H on B-H loop
c, B
c) be in position 1.; In the process that exciting current in field coil increases gradually, (H
c, B
c) be from B-H loop 1. to 2. moving, until 2. reach exciting current maximum; Exciting current subsequently in field coil from maximum be reduced to zero time, the point (H on B-H loop
c, B
c) from 2. moving to 3.; Remanent magnetism in iron core reaches constant, and iron core becomes the operating fields that permanent magnet provides instrument.
Reverse excitation: need the direction changing remanent magnetism to pass into the direction of exciting current with regard to needs in field coil, iron core magnetizes reverse just by B-H loop of process, from 3. by 4., and then get back to 1., in iron core, remanent magnetism reaches constant is that direction is contrary with during forward, and instrumentation magnetic field is also contrary with equal and opposite in direction direction during forward.
Represent the whole excitation process magnetized to iron core by electric current and iron-core magnetic induction intensity, as shown in Figure 5, in a coordinate system, transverse axis is the exciting current I in field coil, and the longitudinal axis is the magnetic induction density B that iron core produces
g.
The utility model residual magnetism excitation adopts magnetic direction can by the soft magnet that alternately changes as magnetic core, utilize the remanent magnetism with the iron core of soft magnetic characteristic to provide operating fields, adopt the direction changing exciting current in field coil alternately to magnetize to iron core the remanent magnetic field direction changing iron core simultaneously, realize the object that magnetic field alternately changes, prevent induction electromotive force from electrode, producing polarization phenomena, reach same coil Alternating Current Excitation and suppress the excitation mode that polarization phenomena effect is the same.
Under identical excitation frequency and field voltage condition, excitation power consumption is proportional to the area that magnetizing current curve and transverse axis are formed.Compare coil magnetization, residual magnetism excitation technology only needs to provide very of short duration exciting current, therefore exciting current consumption is very little, the exciting current power consumption of residual magnetism excitation only has 1/60 to 1/10 of coil magnetization current power dissipation, comparison diagram 2 and Fig. 3 can find out, therefore the lower power consumption of residual magnetism excitation clearly, is beneficial to the electromagnetic flowmeter manufacturing super low-power consumption.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (3)
1. a residual magnetism excitation electromagnetic flowmeter, it is characterized in that: comprise electrode (1), bushing pipe (2), Circuits System (3), field coil and iron core, described electrode (1) is provided with two, described two electrodes (1) are distributed on described bushing pipe (2), and described two electrodes (1) are connected respectively by the signal input part of wire with described Circuits System (3), described field coil is provided with two, be respectively the first field coil (4.1), second field coil (4.2), described first field coil (4.1) and the second field coil (4.2) are distributed in described bushing pipe (2) around, described iron core is provided with two, be respectively the first iron core (5.1) and the second iron core (5.2), described first iron core (5.1) is provided with in described first field coil (4.1), described second iron core (5.2) is provided with in described second field coil (4.2), described first iron core (5.1) and the second iron core (5.2) are the soft-magnetic body with hysteresis, one end of described first field coil (4.1) is connected by wire with one end of described second field coil (4.2), the other end of described first field coil (4.1) is connected by the exciting current output terminal of wire with described Circuits System (3).
2. a kind of residual magnetism excitation electromagnetic flowmeter according to claim 1, it is characterized in that: described bushing pipe (2) is annulus tubulose, described two electrodes (1) are centrosymmetric along described bushing pipe (2) axis to be distributed on described bushing pipe (2).
3. a kind of residual magnetism excitation electromagnetic flowmeter according to claim 2, it is characterized in that: described first field coil (4.1) and the first iron core (5.1) form the first residual magnetism excitation mechanism, described second field coil (4.2) and the second iron core (5.2) form the second residual magnetism excitation mechanism, described first residual magnetism excitation mechanism and the second residual magnetism excitation mechanism is centrosymmetric along described bushing pipe (2) axis is distributed in around described bushing pipe, and the axis at the axis at described first residual magnetism excitation mechanism and the second residual magnetism excitation mechanism place and two electrode (1) places is perpendicular.
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| CN201420363135.XU CN204064355U (en) | 2014-07-02 | 2014-07-02 | A kind of residual magnetism excitation electromagnetic flowmeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104121953A (en) * | 2014-07-02 | 2014-10-29 | 重庆川仪自动化股份有限公司 | Residual magnetism excitation electromagnetic flowmeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104121953A (en) * | 2014-07-02 | 2014-10-29 | 重庆川仪自动化股份有限公司 | Residual magnetism excitation electromagnetic flowmeter |
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