CN111457990A - Tabi type eddy current coil set liquid level meter and liquid level measuring method - Google Patents
Tabi type eddy current coil set liquid level meter and liquid level measuring method Download PDFInfo
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- CN111457990A CN111457990A CN202010367961.1A CN202010367961A CN111457990A CN 111457990 A CN111457990 A CN 111457990A CN 202010367961 A CN202010367961 A CN 202010367961A CN 111457990 A CN111457990 A CN 111457990A
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- 239000007788 liquid Substances 0.000 title claims abstract description 112
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000001514 detection method Methods 0.000 claims description 31
- 239000000615 nonconductor Substances 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005288 electromagnetic effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
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- Electromagnetism (AREA)
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a Tay-comparing type eddy current coil group liquid level meter and a liquid level measuring method, wherein the liquid level meter comprises a measured liquid container, an upper communicating pipe is arranged at the position, close to the upper edge, of the left side surface of the measured liquid container, a lower communicating pipe is arranged at the position, close to the lower edge, of the left side surface of the measured liquid container, the upper communicating pipe and the lower communicating pipe are both connected to a non-conductive body measuring cylinder, a non-conductive body comparing cylinder is arranged at the left side of the non-conductive body measuring cylinder, a detecting coil is wound on the non-conductive body measuring cylinder, the other end of the detecting coil is wound on the surface of the non-conductive body comparing cylinder, coil joints are arranged at two ends of the detecting coil, the coil joints are connected with signal lines, and the; the liquid level inside the container is determined by measuring the liquid level inside the non-conductive measuring cylinder by using a Taber type eddy current coil group liquid level meter and utilizing the principle of a communicating vessel.
Description
Technical Field
The invention relates to the technical field of liquid level meters, in particular to a Tabi eddy current coil assembly liquid level meter and a liquid level measuring method.
Background
At present, an electric contact liquid level meter is commonly used as a liquid level measuring instrument and is widely applied to the measurement of various liquids. The working principle of the electric contact liquid level meter is designed according to the difference of the resistivities of water and steam, and the electrode of the measuring cylinder has small resistance to the cylinder body in water and large resistance to the cylinder body in steam. The electric contact liquid level meter judges the position of a steam-water interface by measuring the resistance between electrodes in steam-water medium in a measuring cylinder connected with a container, and the quantity of the connected electrodes in water changes along with the change of the water level, so that the change of the resistance value is converted. However, in the electric contact liquid level meter, the electrode is directly contacted with the liquid, so that the electrode is soaked in the liquid for a long time, the electrode is easy to corrode, and leakage is generated.
In view of the above technical problems, no effective solution has been proposed at present.
Disclosure of Invention
In view of the above technical problems in the related art, the present invention provides a talbe eddy current coil assembly liquid level meter and a liquid level measuring method, which can overcome the above disadvantages in the prior art.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
the other-comparison type eddy current coil group liquid level meter comprises a measured liquid container, wherein an upper communicating pipe is arranged on the left side face of the measured liquid container close to the upper edge, a lower communicating pipe is arranged on the left side face of the measured liquid container close to the lower edge, the upper communicating pipe and the lower communicating pipe are connected to a non-conductive body measuring cylinder, a non-conductive body comparison cylinder is arranged on the left side of the non-conductive body measuring cylinder, a detection coil is wound on the non-conductive body measuring cylinder, the other end of the detection coil is wound on the surface of the non-conductive body comparison cylinder, coil joints are arranged at two ends of the detection coil and connected with a signal line, and the other end of the signal line is connected with an eddy current detector.
Furthermore, the specification and the material of the non-conductor measuring cylinder and the non-conductor comparing cylinder are the same.
The number of turns and the turn distance of the detection coil wound on the surface of the non-conductive body measuring cylinder are the same as those of the detection coil wound on the surface of the non-conductive body measuring cylinder.
Further, the vortex detector is of an EEC-2004 model.
Furthermore, the non-conductive body measuring cylinder, the non-conductive body comparison cylinder and the detection coil form a testing block group of the other-comparison type eddy current coil group liquid level meter.
The invention also provides a liquid level measuring method of the Tabi eddy current coil group liquid level meter, which comprises the following steps:
s1: winding detection coils on the surface of the non-conductive body measuring cylinder and the surface of the non-conductive body comparison cylinder to form a comparison type eddy current coil group, and connecting the comparison type eddy current coil group with an eddy current detector;
s2: ensuring that all substances in the non-conductive measuring cylinder are in a gas phase space, starting and adjusting the eddy current detector to enable the amplitude of an impedance response signal of the detection coil to be zero so as to offset system errors brought by the cylinder;
s3: making a response signal amplitude-liquid level height reference curve, taking the liquid level height percentage as an abscissa and the impedance response signal amplitude as an ordinate, and obtaining the single value corresponding relation of the two;
s4: and respectively leading out a communicating pipe at the position of the measured liquid container close to the upper edge and the position of the measured liquid container close to the lower edge, connecting the communicating pipes to the non-conductive measuring cylinder, and determining the liquid level in the measured liquid container by measuring the liquid level in the non-conductive measuring cylinder by utilizing the principle of a communicating device.
Further, in step S1, the Zener eddy current coil assembly carries an alternating current to generate an alternating magnetic field.
Further, in step S2, the nonconductive measuring cylinder is identical to the nonconductive comparing cylinder.
Further, in step S3, the step of creating the response signal amplitude-liquid level height reference curve includes the following steps:
s31: drawing a coordinate graph by taking the liquid level height percentage as an abscissa and the impedance response signal amplitude as an ordinate;
s32: respectively measuring the impedance response signal amplitude values of the detection coils on an eddy current detector by using a test block group of a Taber type eddy current coil group liquid level meter;
s33: respectively and sequentially acquiring corresponding wave amplitude values a, b, c and d when the liquid level height percentage is 25%, 50%, 75% and 100% on the coordinate graph to obtain four points;
s34: and smoothly connecting four points in the step S33 to obtain a smooth curve, namely a response signal amplitude-liquid level height reference curve.
In step S33, the number of values is increased according to the use accuracy of the other eddy current coil assembly level meter.
The invention has the beneficial effects that: according to the liquid level meter and the liquid level measuring method for the Tabi type eddy current coil assembly based on non-contact measurement, the liquid medium can be directly measured without contacting the liquid medium, corrosion of the liquid medium to a measuring point is reduced, the performance is reliable, and the effect is remarkable; and because the eddy current response signal is an electric signal, remote monitoring can be realized through a signal wire, and the method is particularly suitable for measuring the liquid level height of liquid media such as corrosive radioactivity and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of an arrangement of an eddy current coil assembly level gauge according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a test block set of an other-ratio eddy current coil set level gauge according to an embodiment of the present invention;
FIG. 3 is a reference curve of response signal amplitude versus liquid level height for a method of measuring liquid level for an other-ratio eddy current coil assembly level gauge according to an embodiment of the present invention.
In the figure:
1. a tested liquid container; 2. an upper communicating pipe; 3. a lower communicating pipe; 4. a non-conductive body measuring cylinder; 5. a non-conductor comparison cylinder; 6. a signal line; 7. a detection coil; 8. an eddy current detector.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
As shown in fig. 1-2, according to the present invention, an eddy current coil assembly level gauge includes a measured liquid container 1, an upper communicating tube 2 is disposed on a left side of the measured liquid container 1 near an upper edge, a lower communicating tube 3 is disposed on the left side of the measured liquid container 1 near a lower edge, the upper communicating tube 2 and the lower communicating tube 3 are both connected to a non-conductive body measuring cylinder 4, a non-conductive body comparing cylinder 5 is disposed on a left side of the non-conductive body measuring cylinder 4, a detecting coil 7 is wound on the non-conductive body measuring cylinder 4, the other end of the detecting coil 7 is wound on a surface of the non-conductive body comparing cylinder 5, coil joints are disposed on two ends of the detecting coil 7, the coil joints are connected to a signal line 6, and the other end of the signal line 6 is connected to an eddy current detector 8.
In one embodiment, the non-conductive measuring cylinder 4 and the non-conductive comparing cylinder 5 are the same in specification and material.
Preferably, the number of turns and the pitch of the detection coil 7 wound on the surface of the non-conductive body measuring cylinder 4 are the same as those wound on the surface of the non-conductive body measuring cylinder 5.
In one embodiment, the eddy current tester 8 is model EEC-2004.
In one embodiment, the non-conductive body measuring cylinder 4, the non-conductive body comparison cylinder 5 and the detection coil 7 form a test block group of the other comparison type eddy current coil group liquid level meter.
As shown in FIG. 3, the present invention also provides a liquid level measuring method of the Taber type eddy current coil assembly liquid level meter, which comprises the following steps:
s1: winding detection coils 7 on the surface of the non-conductive body measuring cylinder 4 and the surface of the non-conductive body comparison cylinder 5 to form a comparison type eddy current coil group, and connecting the comparison type eddy current coil group with an eddy current detector 8;
s2: ensuring that all substances in the non-conductive body measuring cylinder 4 are in a gas phase space, starting and adjusting the eddy current detector 8 to enable the impedance response signal amplitude of the detection coil 7 to be zero so as to counteract system errors brought by the cylinder;
s3: making a response signal amplitude-liquid level height reference curve, taking the liquid level height percentage as an abscissa and the impedance response signal amplitude as an ordinate, and obtaining the single value corresponding relation of the two;
s4: and respectively leading out a communicating pipe at the position of the measured liquid container 1 close to the upper edge and the position of the measured liquid container 1 close to the lower edge, connecting the communicating pipes to the non-conductive body measuring cylinder 4, and determining the liquid level in the measured liquid container 1 by measuring the liquid level in the non-conductive body measuring cylinder 4 by utilizing the principle of a communicating device.
In one embodiment, in step S1, the Zener eddy current coil assembly carries an alternating current to generate an alternating magnetic field.
Preferably, the alternating magnetic field passes through the non-conductive measuring cylinder 4, the non-conductive comparison cylinder 5 and acts on the substance inside the measuring cylinder
In one embodiment, as shown in FIG. 3, in step S2, the non-conductive measurement cylinder is identical to the non-conductive comparison cylinder.
In one embodiment, the step S3 of creating the response signal amplitude-liquid level height reference curve includes the following steps:
s31: drawing a coordinate graph by taking the liquid level height percentage as an abscissa and the impedance response signal amplitude as an ordinate;
s32: respectively measuring the impedance response signal amplitude of the detection coil 7 on the eddy current detector 8 by using a testing block group of a Taber type eddy current coil group liquid level meter;
s33: respectively and sequentially acquiring corresponding wave amplitude values a, b, c and d when the liquid level height percentage is 25%, 50%, 75% and 100% on the coordinate graph to obtain four points;
s34: and smoothly connecting four points in the step S33 to obtain a smooth curve, namely a response signal amplitude-liquid level height reference curve.
Preferably, in step S33, the number of values is increased according to the use accuracy of the other eddy current coil assembly liquid level meter.
In a specific embodiment, the impedance of the detection coil 7 is detected using an eddy current detection method.
Preferably, the eddy current inspection is a nondestructive inspection method for evaluating a workpiece to be inspected by using an electromagnetic effect of eddy currents induced in a conductive material by an alternating magnetic field.
Preferably, the eddy current detection is based on the principle that when the detection coil 7 carrying the alternating current is close to the object, if the object is a conductive substance, an eddy current is induced in the conductive substance by an alternating magnetic field generated by the detection coil 7, and the impedance of the detection coil 7 is changed by a reaction magnetic field of the induced eddy current, and the electrical conductivity of the detected object can be determined by measuring the impedance change of the detection coil 7.
In order to facilitate understanding of the above-described technical aspects of the present invention, the above-described technical aspects of the present invention will be described in detail below in terms of specific usage.
When the liquid level meter is used specifically, according to the other-ratio eddy current coil group liquid level meter, an upper communicating pipe 2 and a lower communicating pipe 3 are respectively led out from the upper edge position and the lower edge position of a measured liquid container 1, then the other-ratio eddy current coil group is connected, the number of turns and the turn distance of a non-conductive body measuring cylinder 4 and a detection coil 7 wound outside a non-conductive body comparison cylinder 5 are kept to be the same, the winding mode of the detection coil 7 is shown in figure 2, and then the other-ratio eddy current coil group is connected with an eddy current detector 8 through a signal wire 6; then, the inner parts of the non-conductor measuring cylinder 4 and the non-conductor comparison cylinder 5 are kept to be gas phase spaces, and the eddy current detector 8 is adjusted to eliminate system errors of other comparison type eddy current coil groups; then, drawing a response signal amplitude-liquid level height reference curve by taking the liquid level height percentage as an abscissa and the impedance response signal amplitude as an ordinate; and finally, determining the liquid level inside the tested liquid container 1 by measuring the liquid level in the non-conductive body measuring cylinder 4 by utilizing the principle of a communicating vessel.
In conclusion, the defects of an electric contact liquid level meter are overcome, and the novel Tabiyi eddy current coil group liquid level meter and the liquid level measuring method for non-contact measurement are provided, so that the liquid medium can be measured without directly contacting a liquid working medium, and the corrosion of the liquid medium to a measuring point is reduced; simultaneously, by utilizing the characteristics of different conductivity performances of air and a liquid medium, the ratio of the air space to the liquid space in the measuring cylinder is determined by measuring the eddy current response of other ratio type coils arranged around the circumference of different measuring cylinders, so that the liquid level height is determined; and because the eddy current response signal is an electric signal, remote monitoring can be realized through a signal wire, and the liquid level height measuring device is particularly suitable for liquid level height measurement of corrosive radioactive liquid and the like.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A Tay type eddy current coil group liquid level meter comprises a measured liquid container (1) and is characterized in that, an upper communicating pipe (2) is arranged on the left side surface of the measured liquid container (1) near the upper edge, a lower communicating pipe (3) is arranged on the left side surface of the measured liquid container (1) near the lower edge, the upper communicating pipe (2) and the lower communicating pipe (3) are both connected to a non-conductive body measuring cylinder (4), a non-conductor comparison cylinder (5) is arranged on the left of the non-conductor measuring cylinder (4), a detection coil (7) is wound on the non-conductive body measuring cylinder (4), the other end of the detection coil (7) is wound on the surface of the non-conductive body comparison cylinder (5), the detection coil (7) both ends department all is provided with the coil and connects, the coil connects and is connected with signal line (6), the signal line (6) other end is connected with eddy current detector (8).
2. The eddy current coil assembly level gauge according to claim 1, wherein the non-conductive measuring cylinder (4) and the non-conductive comparing cylinder (5) are of the same specification and material.
3. An eddy current coil assembly level gauge according to claim 2, wherein the detecting coil (7) is wound on the surface of the non-conductive body measuring cylinder (4) with the same number of turns and pitch as the non-conductive body comparing cylinder (5).
4. The Tabti eddy current coil assembly level gauge according to claim 1, wherein the eddy current detector (8) is of the type EEC-2004.
5. The eddy current coil assembly level gauge according to claim 1, wherein the non-conductive body measuring cylinder (4), the non-conductive body comparing cylinder (5) and the detection coil (7) constitute a test block set of the eddy current coil assembly level gauge.
6. A liquid level measuring method of an Taber-type eddy current coil assembly liquid level gauge as claimed in any one of claims 1 to 5, comprising the steps of:
s1: winding detection coils on the surface of the non-conductive body measuring cylinder and the surface of the non-conductive body comparison cylinder to form a comparison type eddy current coil group, and connecting the comparison type eddy current coil group with an eddy current detector;
s2: ensuring that all substances in the non-conductive measuring cylinder are in a gas phase space, starting and adjusting the eddy current detector to enable the amplitude of an impedance response signal of the detection coil to be zero so as to offset system errors brought by the cylinder;
s3: making a response signal amplitude-liquid level height reference curve, taking the liquid level height percentage as an abscissa and the impedance response signal amplitude as an ordinate, and obtaining the single value corresponding relation of the two;
s4: and respectively leading out a communicating pipe at the position of the measured liquid container close to the upper edge and the position of the measured liquid container close to the lower edge, connecting the communicating pipes to the non-conductive measuring cylinder, and determining the liquid level in the measured liquid container by measuring the liquid level in the non-conductive measuring cylinder by utilizing the principle of a communicating device.
7. The method as claimed in claim 6, wherein in step S1, the eddy current coil assembly carries an alternating current to generate an alternating magnetic field.
8. The method as claimed in claim 6, wherein in step S2, the non-conductive measuring cylinder is identical to the non-conductive comparing cylinder.
9. The method as claimed in claim 6, wherein the step S3 of creating the response signal amplitude-liquid level height reference curve comprises the steps of:
s31: drawing a coordinate graph by taking the liquid level height percentage as an abscissa and the impedance response signal amplitude as an ordinate;
s32: respectively measuring the impedance response signal amplitude values of the detection coils on an eddy current detector by using a test block group of a Taber type eddy current coil group liquid level meter;
s33: respectively and sequentially acquiring corresponding wave amplitude values a, b, c and d when the liquid level height percentage is 25%, 50%, 75% and 100% on the coordinate graph to obtain four points;
s34: and smoothly connecting four points in the step S33 to obtain a smooth curve, namely a response signal amplitude-liquid level height reference curve.
10. The method as claimed in claim 9, wherein in step S33, the number of values is increased according to the use accuracy of the eddy current coil assembly level gauge.
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| CN202010367961.1A CN111457990A (en) | 2020-04-30 | 2020-04-30 | Tabi type eddy current coil set liquid level meter and liquid level measuring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113551623A (en) * | 2021-07-15 | 2021-10-26 | 西安热工研究院有限公司 | A spirit level and measuring method for measuring deflection of large-span components |
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2020
- 2020-04-30 CN CN202010367961.1A patent/CN111457990A/en active Pending
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Application publication date: 20200728 |