CN110608786A - Electric conduction type liquid level meter - Google Patents
Electric conduction type liquid level meter Download PDFInfo
- Publication number
- CN110608786A CN110608786A CN201911054348.8A CN201911054348A CN110608786A CN 110608786 A CN110608786 A CN 110608786A CN 201911054348 A CN201911054348 A CN 201911054348A CN 110608786 A CN110608786 A CN 110608786A
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- China
- Prior art keywords
- tube
- liquid level
- electrode tube
- inner electrode
- insulating tube
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Classifications
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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
Abstract
The invention discloses a conductive liquid level meter, which aims to solve the problem of low resolution of the conventional measured liquid level. The product comprises an inner electrode tube, an outer electrode tube, an insulating tube and a calibration electrode, wherein the insulating tube is inserted into the inner electrode tube, the inner electrode tube is inserted into the outer electrode tube, a lead is installed in the insulating tube, and the calibration electrode is positioned at the lower end of the insulating tube. The product can be directly inserted into the liquid to be detected without adopting a pressure leading pipe structure, so that the structure is simplified, and the risk of pipe breakage is reduced; the product adopts continuous conductivity measurement through the matching of the inner electrode tube, the insulating tube and the outer electrode tube, has the characteristics of continuous liquid level measurement and high precision compared with an electric contact liquid level meter adopting a conductivity mode, and overcomes the problem that an electric contact is easy to corrode; the product adopts the calibration electrode, and can automatically correct the measurement result along with the change of the measurement condition in the container, thereby greatly improving the accuracy and flexibility of measurement.
Description
Technical Field
The invention relates to the field of liquid level measurement, in particular to a conductive liquid level meter.
Background
The technology and method for measuring the liquid level in the container are various, and comprise a tube type liquid level meter, a magnetic turning plate type liquid level meter, a differential pressure liquid level meter, an ultrasonic liquid level meter and the like. However, many level measurement methods are not suitable for certain applications, such as where the liquid contents of the container are highly hazardous and do not allow for leakage.
For the special pressure leading pipe arranged outside the pressure container, such as a magnetic turning plate type liquid level meter and a differential pressure liquid level meter, the measuring pipeline becomes complicated and the failure probability is greatly increased because a very long pressure leading pipe is required to be arranged and special isolation measures are adopted. In the ultrasonic level meter and the like, since electronic components are required to be exposed to a severe environment, the electronic components are liable to fail due to high temperature and high pressure. The electric contact liquid level meter utilizes the principle that the difference of the electric conductivity of water and steam is large to measure the liquid level, and the liquid level height can be obtained discontinuously by arranging a plurality of pairs of electrodes on the height. However, the electric contact liquid level meter has the problem of low liquid level resolution.
Disclosure of Invention
An object of an embodiment of the present invention is to provide an electrically conductive liquid level meter, so as to solve the problems mentioned in the background art.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
an electric conduction type liquid level meter comprises an inner electrode tube, an outer electrode tube, an insulating tube and a calibration electrode, wherein the insulating tube is inserted into the inner electrode tube, the inner electrode tube is inserted into the outer electrode tube, a lead is installed in the insulating tube, the calibration electrode is positioned at the lower end of the insulating tube, the electric insulation state between the inner electrode tube and the outer electrode tube and between the outer electrode tube and other metal components can be ensured, and when a liquid medium in a container enters an annular cavity between the inner electrode tube and the outer electrode tube through a hole in the outer electrode tube, the electric conductivity between the inner electrode tube and the outer electrode tube is changed; at the moment, alternating voltage is applied to the inner electrode tube and the outer electrode tube, so that the conductance coefficient between the electrodes can be obtained through a secondary instrument, and the measured value of the liquid level can be obtained according to the relation between different liquid levels and the conductivities. In addition, during long-term operation, measurement errors can also occur due to changes in the conductance of the medium itself. In order to overcome the problems, a pair of calibration electrodes is arranged at the lower end of the insulating tube, the calibration electrodes are small in structure and are positioned at the bottom, so that the calibration electrodes are always positioned in liquid, and the measured values obtained by the calibration electrodes can correct the influence of liquid level measurement caused by temperature and medium conductivity coefficient changes.
As a further scheme of the embodiment of the invention: the calibration electrode comprises an outer electrode and an inner electrode, and is simple in structure, and better in measurement accuracy and flexibility.
As a further scheme of the embodiment of the invention: the insulating tube is made of silicon carbide fiber, and the insulating effect is good.
As a further scheme of the embodiment of the invention: the outer electrode tube is installed on the third fixing seat, and the inner electrode tube is installed on the second fixing seat, so that the measuring process is guaranteed to be not prone to shaking, and the measuring accuracy is guaranteed.
As a further scheme of the embodiment of the invention: the upper end of the inner electrode tube is locked on the first fixing seat by a fastener, so that the measurement accuracy is further ensured.
As a further scheme of the embodiment of the invention: the fastener adopts the fixation nut, and the market is easily bought, is convenient for install and change.
As a further scheme of the embodiment of the invention: the calibration electrodes were replaced with conductance probes.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the product does not need to adopt a pressure leading pipe structure, so that the structure is simplified, and the risk of pipe breakage is reduced;
the product adopts continuous conductivity measurement through the matching of the inner electrode tube, the insulating tube and the outer electrode tube, has the characteristics of continuous liquid level measurement and high precision compared with an electric contact liquid level meter adopting a conductivity mode, and overcomes the problem that an electric contact is easy to corrode;
the product adopts the calibration electrode, and can automatically correct the measurement result along with the change of the measurement condition in the container, thereby greatly improving the accuracy and flexibility of measurement.
Drawings
FIG. 1 is a cross-sectional view of an electrically conductive level gauge.
FIG. 2 is a schematic cross-sectional view of an electrically conductive level gauge.
FIG. 3 is a schematic diagram of the structure of a calibration electrode in the conductivity type liquid level meter.
Wherein: 1-fastener, 2-first fixing seat, 3-second fixing seat, 4-third fixing seat, 5-outer electrode tube, 6-inner electrode tube, 7-lead, 8-insulating tube, 9-calibration electrode, 10-inner electrode and 11-outer electrode.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Example 1
An electric conduction type liquid level meter comprises an inner electrode tube 6, an outer electrode tube 5, an insulating tube 8 and a calibration electrode 9, wherein the insulating tube 8 is inserted into the inner electrode tube 6, the inner electrode tube 6 is inserted into the outer electrode tube 5, a lead 7 is installed in the insulating tube 8, the calibration electrode 9 is positioned at the lower end of the insulating tube 8, the electric insulation state between the inner electrode tube 6 and the outer electrode tube 5 and between the outer electrode tube 5 and other metal components can be ensured, and when a liquid medium in a container enters an annular cavity between the inner electrode tube 6 and the outer electrode tube 5 through a hole in the outer electrode tube 5, the electric conductivity between the inner electrode tube 6 and the outer electrode tube 5 is changed; at this time, alternating voltage is applied to the inner electrode tube 6 and the outer electrode tube 5, so that the conductance between the electrodes can be obtained through a secondary instrument, and the measured value of the liquid level can be obtained according to the relation between different liquid levels and the conductivities, but the conductance is influenced by the temperature change, so that a larger error is easily introduced. In addition, during long-term operation, measurement errors can also occur due to changes in the conductance of the medium itself. In order to overcome the problems, a pair of calibration electrodes 9 is arranged at the lower end of the insulating tube 8, the calibration electrodes 9 are small in structure and are positioned at the bottom, so that the calibration electrodes 9 are always positioned in liquid, and the measured value obtained by the calibration electrodes 9 can correct the influence of liquid level measurement caused by temperature and medium conductivity coefficient change.
For better measurement accuracy and flexibility, the calibration electrode 9 comprises an outer electrode 11 and an inner electrode 10, and the structure is simple.
Furthermore, the insulating tube 8 is made of silicon carbide fibers, so that the insulating effect is good.
Example 2
An electric conduction type liquid level meter comprises an inner electrode tube 6, an outer electrode tube 5, an insulating tube 8 and a conductive probe, wherein the insulating tube 8 is inserted into the inner electrode tube 6, the inner electrode tube 6 is inserted into the outer electrode tube 5, a lead 7 is installed in the insulating tube 8, the conductive probe is positioned at the lower end of the insulating tube 8, the electric insulation state between the inner electrode tube 6 and the outer electrode tube 5 and between the outer electrode tube 5 and other metal components can be ensured, and when a liquid medium in a container enters an annular cavity between the inner electrode tube 6 and the outer electrode tube 5 through a hole in the outer electrode tube 5, the electric conductivity between the inner electrode tube 6 and the outer electrode tube 5 is changed; at this time, alternating voltage is applied to the inner electrode tube 6 and the outer electrode tube 5, so that the conductance between the electrodes can be obtained through a secondary instrument, and the measured value of the liquid level can be obtained according to the relation between different liquid levels and the conductivities, but the conductance is influenced by the temperature change, so that a larger error is easily introduced. In addition, during long-term operation, measurement errors can also occur due to changes in the conductance of the medium itself. In order to overcome the above problems, a conductivity probe is arranged at the lower end of the insulating tube 8, the conductivity probe is positioned at the bottom and is always positioned in the liquid, and the measured value obtained by the conductivity probe can correct the influence of liquid level measurement caused by the change of temperature and medium conductivity coefficient.
In order to guarantee the measuring accuracy, the outer electrode tube 5 is installed on the third fixing seat 4, and the inner electrode tube 6 is installed on the second fixing seat 3, so that the measuring process is guaranteed to be not prone to shaking.
Furthermore, the upper end of the inner electrode tube 6 is locked on the first fixed seat 2 by the fastener 1, so that the measurement accuracy is further ensured.
Furthermore, the fastening piece 1 adopts a fixing nut, is easily purchased in the market and is convenient to install and replace.
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. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. The utility model provides an electric conduction formula level gauge, its characterized in that, includes inner electrode pipe (6), outer electrode pipe (5), insulating tube (8) and calibration electrode (9), insert insulating tube (8) and inner electrode pipe (6) insert inside outer electrode pipe (5) in inner electrode pipe (6), install wire (7) in insulating tube (8), calibration electrode (9) are located insulating tube (8) lower extreme.
2. The conductive level gauge of claim 1, wherein the calibration electrode (9) comprises an outer electrode (11) and an inner electrode (10).
3. The electrically conductive level gauge of claim 1, characterized in that the insulating tube (8) is made of silicon carbide fiber.
4. The electrically conductive level gauge of claim 1, wherein the outer electrode tube (5) is mounted on the third holder (4) and the inner electrode tube (6) is mounted on the second holder (3).
5. The electrically conductive level gauge of claim 4, wherein the upper end of the inner electrode tube (6) is locked to the first holder (2) by means of a fastener (1).
6. The electrically conductive level gauge of claim 5, wherein the fastener (1) is a retaining nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911054348.8A CN110608786A (en) | 2019-10-31 | 2019-10-31 | Electric conduction type liquid level meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911054348.8A CN110608786A (en) | 2019-10-31 | 2019-10-31 | Electric conduction type liquid level meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110608786A true CN110608786A (en) | 2019-12-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911054348.8A Pending CN110608786A (en) | 2019-10-31 | 2019-10-31 | Electric conduction type liquid level meter |
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| Country | Link |
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| CN (1) | CN110608786A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116295711A (en) * | 2023-05-24 | 2023-06-23 | 北京锐达仪表有限公司 | High-precision material level detection system with fixed point self-calibration function |
-
2019
- 2019-10-31 CN CN201911054348.8A patent/CN110608786A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116295711A (en) * | 2023-05-24 | 2023-06-23 | 北京锐达仪表有限公司 | High-precision material level detection system with fixed point self-calibration function |
| CN116295711B (en) * | 2023-05-24 | 2023-08-15 | 北京锐达仪表有限公司 | High-precision material level detection system with fixed point self-calibration function |
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