CN205209593U - Exchangeable formula liquid metal level gauge of wide range - Google Patents
Exchangeable formula liquid metal level gauge of wide range Download PDFInfo
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- CN205209593U CN205209593U CN201520997609.0U CN201520997609U CN205209593U CN 205209593 U CN205209593 U CN 205209593U CN 201520997609 U CN201520997609 U CN 201520997609U CN 205209593 U CN205209593 U CN 205209593U
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- liquid metal
- level gauge
- secondary instrument
- wide range
- level
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Abstract
The utility model relates to an exchangeable formula liquid metal level gauge of wide range. This level gauge adopts armor nickel twin cable level in the sensing unit of support chassis axis winding constitution level gauge on support chassis, and one of them heart yearn is as former limit exciting coil, the vice limit measuring coil of another heart yearn conduct. Adopt and exchange the constant current source as former limit excitation input, at vice limit measuring coil production induced electromotive force. Along with the change of liquid metal liquid level and then change secondary's induced electromotive force, thus the measurement through maring definite liquid level and induced electromotive force curves realization liquid metal liquid level. The intraductal armoured thermocouple that installs of level gauge cover combines supporting secondary meter, can be in real time the change of the level gauge graduation characteristic that causes owing to the medium temperature change of compensation on line, guaranteed the measurement accuracy of liquid metal at whole operating temperature within range.
Description
Technical field
The utility model is specifically related to a kind of wide range mutual inductance type liquid metal level meter, belongs to level gauging field.
Background technology
Because liquid metal temperature is high, chemical property active and mostly application be in high radiation environment, so conventional liquid level gauge cannot be applied in liquid level of liquid metal fields of measurement.Current liquid level of liquid metal is measured and is all utilized conductivity technology to carry out.Measure and have two kinds of methods of classifying: be to be divided into the point type of interruption or continous way and contact or contactless respectively.Being interrupted point type liquid level gauge usually makes variable, thus enables it play the function of continous way liquid level gauge.Method sensitive element to be moved or continuity degree desirably chooses the sensitive spot of a series of suitable spacing.Generally, point type sensitive element has better resolution and confidence level than continous way.Directly and the sensitive element of liquid level Metal Contact with compatibility and structural intergrity for condition.But, be that the sensitive element of principle is subject to wetting conditions impact with electrical conductance.Contactless sensitive element is not by the impact of these conditions.Because they are arranged on an insertion container and in the sleeve pipe of end seal.Contactless sensitive element is relatively easily changed and is keeped in repair.
The sensitive element of mutual inductance type liquid level gauge is arranged in protective casing, does not directly contact with liquid metal, therefore have that structure is simple, the linearity good, high temperature resistant, be easy to replacing and can realize the advantages such as continuous coverage.Its principle of work is the characteristic of the high conductivity based on liquid metal.The liquid level gauge of development adopts non-contacting mutual inductance type sensitive element to measure, according to Theory of Electromagnetic Field, when there being alternating current in the winding of former limit, induction electromotive force will be produced in secondary winding, the size of induction electromotive force can be subject to the impact around winding medium, the alternating flux of now former limit winding generation, on the one hand with secondary winding interlinkage, inductive loop is produced on the other hand in liquid level gauge outer tube and measured medium sodium, thus generation induced field, cause total magnetic flux to reduce, and then reduce the induction electromotive force of secondary winding.The liquid level of measured medium and the decrease of secondary winding induction electromotive force are inversely proportional under certain condition.
Adopt the measurement of the liquid metal of mutual inductance type principle to find Chinese Patent Application No. 200710111397.1 in open source literature data, be single-point type liquid metal level meter, the continuous coverage of liquid level can not be carried out.
The liquid level gauge of number of patent application 95222877.7, good linear for ensureing that it has, require that between winding, pitch should be even, should closely cooperate between silk and plug, therefore higher to the requirement of processing technology.And the impact by sheathed cable drawing process cannot realize the measurement of wide range (more than 2m) liquid level.
Therefore according to engineering demand, a kind of liquid level gauge of new construction is needed to carry out the measurement of liquid metal.
Utility model content
The purpose of this utility model is to provide a kind of wide range mutual inductance type liquid metal level meter, and this liquid level gauge comprises outside protective case, armouring nickel two-wire cable, thermopair, support frame, secondary instrument;
Described cable level is wrapped on support frame in support frame axis, described cable wherein a heart yearn is as former limit drive coil, another root heart yearn is as secondary measuring coil;
Described the installation of TC is in outside protective case and connect the processing unit of described secondary instrument;
Described former limit drive coil is connected with the driving source in secondary instrument;
Described secondary measuring coil also connects the processing unit of described secondary instrument.
Further, wide range mutual inductance type liquid metal level meter as above, described driving source is the AC constant-current source of 880Hz, 180mA.
Further, wide range mutual inductance type liquid metal level meter as above, the processing unit of described secondary instrument receives electromotive force and the thermocouple signal of the induction of secondary measuring coil, and the matching of liquid level gauge calibration characteristics equation is carried out by following formula, to show and the 4-20mA signal being converted to standard exports to outside computer supervisory control system:
H＝(aT
2+bT+c)U
2+dT
2+eT+f
H in formula-liquid level gauge insertion depth, mm
U
2--the electromotive force of secondary measuring coil induction, mv
T--thermocouple signal, DEG C
The penalty coefficient that a, b, c, d, e, f--determine according to calibration calibration experiments.
Further, wide range mutual inductance type liquid metal level meter as above, described secondary instrument has monitors and shows exciting current, frequency functionality, corrected parameter input function; Secondary instrument has the functions such as self-inspection, power down protection, full scale setting, disconnected even warning, and has the output of 4-20mA DC simulation signal.
Mutual inductance type liquid metal level meter of the present utility model can effectively for the continuous monitoring of high temperature fluent metal liquid level change in container.The utility model adopts level in the winding method of support frame axis, simplify processing technology, and effectively can reduce the consumption of armouring silk, reduce the resistance of winding, thus reach and reduce the load of driving source, reduce the change of the winding resistance rate caused because of temperature variation and the variable quantity of output amplitude that causes.The utility model range of application expands, and range and structure can adjust as required.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model liquid level gauge;
Fig. 2 is the secondary instrument structured flowchart of the utility model liquid level gauge;
Fig. 3 is the simulation test curve of the utility model liquid level gauge.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in detail.
Fig. 1 is mutual inductance type liquid metal level meter structural representation, changes the induction electromotive force of secondary winding, thus realize the measurement of liquid level of liquid metal when liquid level of liquid metal changes.
Liquid level gauge of the present utility model forms primarily of outside protective case 1, armouring nickel two-wire cable 2, thermopair 3, support frame 4, secondary instrument 5.Armouring nickel two-wire cable is wound on support frame as measurement sensitive element level in support frame axis, and wherein a heart yearn is as former limit drive coil AA`, and another root heart yearn is as secondary measuring coil BB`.Adopt the AC constant-current source of 880Hz, 180mA as driving source 6.By thermocouple measurement measuring media temperature.The processing unit 7 of secondary instrument receives electromotive force and the thermocouple signal of the induction of secondary measuring coil, and is carried out the matching of liquid level gauge calibration characteristics equation by following formula, shows and the 4-20mA signal being converted to standard exports to computer supervisory control system.
H＝(aT
2+bT+c)U
2+dT
2+eT+f
H in formula-liquid level gauge insertion depth, mm
U
2--output voltage, mv
T--measured medium temperature, DEG C
The penalty coefficient that a, b, c, d, e, f--determine according to calibration calibration experiments.
When drive coil input in former limit adopts the AC constant-current source of 880Hz, 180mA, simulate different running temperatures by annealing furnace, adopt metal sleeve simulation liquid level of liquid metal to test, the results are shown in Figure shown in 3.
Fig. 2 is secondary instrument structured flowchart, has following functions module as shown in the figure:
1) secondary instrument carries out acquisition and processing to the output voltage signal of secondary measuring coil;
2) secondary instrument gathers Thermocouple Temperature Signal, and real-time online compensates the change of the sensor calibration characteristics caused due to medium temperature change;
3) secondary instrument has and monitors and show exciting current, frequency functionality, corrected parameter input function;
4) secondary instrument has the functions such as self-inspection, power down protection, full scale setting, disconnected even warning, and has the output of 4-20mA DC simulation signal.
Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if belong within the scope of the utility model claim and equivalent technology thereof to these amendments of the present utility model and modification, then the utility model is also intended to comprise these change and modification.
Claims (2)
1. a wide range mutual inductance type liquid metal level meter, is characterized in that:
This liquid level gauge comprises outside protective case, armouring nickel two-wire cable, thermopair, support frame, secondary instrument;
Described cable level is wrapped on support frame in support frame axis, described cable wherein a heart yearn is as former limit drive coil, another root heart yearn is as secondary measuring coil;
Described the installation of TC is in outside protective case and connect the processing unit of described secondary instrument;
Described former limit drive coil is connected with the driving source in secondary instrument;
Described secondary measuring coil also connects the processing unit of described secondary instrument.
2. wide range mutual inductance type liquid metal level meter as claimed in claim 1, is characterized in that:
Described secondary instrument has monitors and shows exciting current, frequency functionality, corrected parameter input function; Secondary instrument has self-inspection, power down protection, full scale is arranged, break even warning function, and has the output of 4-20mA DC simulation signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520997609.0U CN205209593U (en) | 2015-12-04 | 2015-12-04 | Exchangeable formula liquid metal level gauge of wide range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520997609.0U CN205209593U (en) | 2015-12-04 | 2015-12-04 | Exchangeable formula liquid metal level gauge of wide range |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205209593U true CN205209593U (en) | 2016-05-04 |
Family
ID=55847303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520997609.0U Active CN205209593U (en) | 2015-12-04 | 2015-12-04 | Exchangeable formula liquid metal level gauge of wide range |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205209593U (en) |
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2015
- 2015-12-04 CN CN201520997609.0U patent/CN205209593U/en active Active
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| GR01 | Patent grant |