CN107192425A - A kind of liquid level emasuring device and application process of the adaptive range of sectional capacitance - Google Patents
A kind of liquid level emasuring device and application process of the adaptive range of sectional capacitance Download PDFInfo
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- CN107192425A CN107192425A CN201710272896.2A CN201710272896A CN107192425A CN 107192425 A CN107192425 A CN 107192425A CN 201710272896 A CN201710272896 A CN 201710272896A CN 107192425 A CN107192425 A CN 107192425A
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- electrode
- liquid level
- emasuring device
- level emasuring
- adaptive range
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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
- G01F23/263—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 by measuring variations in capacitance of capacitors
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The invention discloses a kind of liquid level emasuring device of the adaptive range of sectional capacitance; including electrode stem; the signal processing apparatus being connected with electrode stem and the upper lid for protection signal processing unit; electrode stem is connect by electrode connecting parts with top cap; electrode stem includes inner and outer electrodes; temperature sensor is provided between interior electrode and external electrode; interior electrode includes drawing by a wire between the metal electrode conductor composition for the diverse location that a support round rod and 5 are distributed on support round rod, each metallic conductor；Electrode stem bottom is provided with plug；Water joint is provided between upper lid and electrode connecting parts；The application process of the device is disclosed in addition, can be applied to the measurement of the interface liquid level of immiscible mixing liquid；The invention measurement accuracy is high, and temperature drift is small, low in energy consumption, and also the liquid level of highly pressurised liquid can be measured；Measurement apparatus is simple in construction, and measuring method is easy, makes cost savings, and operating efficiency is improved.
Description
Technical field
The present invention relates to the level gauging dress of liquid level controlling technical field, more particularly to a kind of adaptive range of sectional capacitance
Put and application process.
Background technology
So-called capacitance type liquid level measuring device, according to capacitance induction principle, when the height of measuring electrode is drawn in measured medium leaching
During change, cause its capacitance variations；Because the permittivity ε 2 in the permittivity ε 1 and liquid level of liquid is different, such as:ε1>ε
2, then when liquid level is raised, total dielectric constant values increase thus capacitance increase therewith between the electrode of capacitance level gauge two.Instead
Decline when liquid level, the reduction of ε values, capacitance also reduces.So, capacitance type liquid level measuring device can pass through two interelectrode electricity
The change of capacity measures the height of liquid level.
At present, the capacitance type liquid level measuring device of in the market supply, species is various, there is float-ball type, and pressure sensor formula swashs
The product of a variety of principles such as light formula and ultrasonic type, but these instruments all have the following disadvantages：1. measurement error is big, substantially
5% or so；2. power consumption is big, electric current is at tens milliamperes to more than 100 milliamperes；3. mechanical part is more, there are mechanical oscillation and make
It is high into fault rate.4. trouble is installed；5. it can not recognize that the oil of different oil products causes the measuring result error of different oil products big, such as
No. 97 gasoline and No. 0 diesel oil, the mixture with water such as lubricating oil；6. liquid level emasuring device common in the art can not be met
The height of the requirement, i.e. lower floor's liquid of interface level measurement, the interface location problem of oil and water especially in oil water mixture.
The content of the invention
Big to solve existing liquid level emasuring device error, power consumption is big, mechanical part is more and installs troublesome shortcoming, this hair
It is bright that following technical scheme is provided：
A kind of liquid level emasuring device of the adaptive range of sectional capacitance, including electrode stem, the signal being connected with electrode stem
Processing unit 3 and the upper lid 1 for protection signal processing unit 3, the electrode stem are connected by electrode connecting parts 4 with upper lid 1
Connect, the electrode stem includes interior electrode 7 and external electrode 6, and the interior electrode 7 is connected by sealing ring 8 with external electrode 6, described
Temperature sensor 9 is provided between interior electrode 7 and external electrode 6, the interior electrode 7 includes at least one support round rod and at least five
The metal electrode conductor 11 for the diverse location being distributed on support round rod is constituted, by least between each metal electrode conductor 11
One wire is drawn；The electrode stem bottom is provided with plug 10；Water joint is provided between the upper lid 1 and electrode connecting parts 4
2；
Further, the interior electrode 7 is by a support round rod and 5 diverse locations being evenly distributed on support round rod
Metal electrode conductor 11 constitute, pass through wire between each metal electrode conductor 11 and draw；
Further, the spacing between the metal electrode conductor 11 is 0.2-1.0mm；
Further, the spacing between the metal electrode conductor 11 is 0.6mm；
Further, a diameter of 8.0mm of the support round rod；
Further, the length of the metal electrode conductor 11, width, height and material all same.
Compared with prior art, beneficial effects of the present invention are as follows：Compared with the height that single hop analyzes liquid, segmentation judges
The height method of liquid improves at least 5 times in precision, and error at least reduces by 20%；Temperature drift is obviously reduced；Such level gauging
Device low-power consumption, it is low to reach 0.5-0.8mA；The liquid level that hydraulic pressure is up to 4.0-6.0MPa can be measured.
The problem of oily measurement error of different oil products is big and can not meet interface level measurement request must not be recognized for solution,
It is as follows that the present invention also provides another technical scheme：
A kind of application process of the liquid level emasuring device of the adaptive range of sectional capacitance, the device can apply to immiscible
The interface level gauging of mixing liquid.
Further, the immiscible mixing liquid is oil water mixture.
Further, the pressure process of the mixing liquid is 4.0-6.0MPa.
Compared with prior art, beneficial effects of the present invention are as follows：The single electrode that electrode stem discards tradition, using more electric
Pole, using the method for scanning, solves when the medium of liquid changes, the change of different medium can be adapted to automatically, so that
Measure the height of the interface of oil water mixture；The method of traditional measurement interface is cumbersome, and device is sufficiently complex, and such a dress
Put simple in construction, measuring method is easy, thus it is cost-effective, improve operating efficiency.
Brief description of the drawings
Fig. 1 is capacitance liquid level measurement apparatus structural representation of the invention；
Fig. 2 is the schematic diagram of capacitor equivalent model in embodiments of the invention 1；
Fig. 3 is the schematic diagram of capacitor equivalent model in embodiments of the invention 2；
Fig. 4 is measuring circuit schematic diagram in embodiments of the invention 3；
Fig. 5 is the installation process figure of liquid level emasuring device in embodiments of the invention 4；
Fig. 6 is the scheme of installation of liquid level emasuring device in embodiments of the invention 4.
Reference：1st, upper lid；2nd, water joint；3rd, signal processing apparatus；4th, electrode connecting parts；05th, flange；6th, dispatch from foreign news agency
Pole；7th, interior electrode；8th, sealing ring；9th, temperature sensor；10th, plug；11st, metal electrode conductor.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Embodiment 1
As shown in figure 1, a kind of liquid level emasuring device of the adaptive range of use Segment equivalent electric capacity is present embodiments provided,
Including electrode stem, the signal processing apparatus 3 being connected with electrode stem and the upper lid 1 for protection signal processing unit 3 are described
It is fixed between electrode stem and electrode connecting parts 4 by flange adaptor 5, electrode connecting parts 4 pass through water joint 2 and upper lid
1 connection；The electrode stem includes interior electrode 7 and external electrode 6, and the interior electrode 7 is connected by sealing ring 8 with external electrode 6, institute
State and temperature sensor 9 is provided between interior electrode 7 and external electrode 6, the lower end of the electrode stem is provided with plug 10, prevents fluid to be measured
Into in electrode stem.
The interior electrode 7 by a diameter of 8.0mm support round rod and the metal electrode conductor 11 of 5 diverse locations,
Metal electrode conductor 11 is evenly distributed in above support round rod, and the spacing between each metal electrode conductor 11 is 0.6mm,
A wire is equipped with each metallic conductor 11, signal is gathered for signal processor 3, each wire is drawn by support round rod
Go out.
As shown in Figures 1 and 2, the liquid level of conducting liquid is mainly measured in the present embodiment, the container of liquid is held and is somebody's turn to do
Liquid is as an electrode of capacitor, and the metallic conductor electrode 11 of insertion is as another electrode, and non-conductive external electrode is made
For intermediate medium, three constitutes a capacitor；The container for holding liquid be electrical insulator, therefore need in addition plus one connect
Earth polar.
The interior electrode has five sections of metallic conductors 11, and the height of every section of metal electrode conductor is respectively H1=H2=H3=
H4=H5, then interior electrode total height：
H is total=H1+H2+H3+H4+H5；
When each section of metallic conductor 11 zero point liquid level be aerial capacitance be CxL, be completely submerged in test solution
Capacitance in body is CxH, when measured medium is when in the range of a certain section, its electric capacity maximum variable quantity, i.e., by zero point liquid level
To capacitance change when being totally submerged：
Δ x=CxH-CxL；
Generally, measured capacitance changing value is relevant with liquid level changing value, and proportional；
If the measurement electric capacity of known a certain section of metallic conductor is Cx, the height of this section is H, then can according to dimensional variation
To obtain the height of this section of metallic conductor institute immersion liquid as Hx：
Hx/H=(Cx-CxL)/(CxH-CxL),
Hx=[H* (Cx-CxL)]/Δ x；
Analysis is calculated more than, can obtain the height of certain section of metallic conductor institute immersion liquid.
During known measured medium submergence first paragraph, the submergence of the metallic conductor of first paragraph is highly H1x, submerges second segment
When, the submergence of the metallic conductor of second segment is highly H2x, and the submergence of the 3rd section of metallic conductor is highly H3x, the 4th section of gold
The submergence for belonging to conductor is highly H4x, and the submergence of the 5th section of metallic conductor is highly H5x,
When first paragraph is liquid-immersed, other sections in atmosphere when, it is total to obtain H, then H it is total=H1x；
When second segment is liquid-immersed, when first paragraph is fully immersed in measured medium, it is total to obtain H, then H it is total=H1+
H2x；
The like, when the 3rd section is liquid-immersed, when first paragraph is fully immersed in measured medium with second segment, obtain
H is total, then H it is total=H1+H2+H3x；
When the 4th section liquid-immersed, when first paragraph, second segment and the 3rd section are fully immersed in measured medium, H is obtained
Always, then H it is total=H1+H2+H3+H4x；
When the 5th section liquid-immersed, first paragraph, second segment, the 3rd section and the 4th section are fully immersed in measured medium
When, it is total to obtain H, then H it is total=H1+H2+H3+H4+H5x
The method of liquid height is so judged using segmentation, the method for analyzing liquid level than single hop before improves 5 in precision
Times, error is the 1/5 of original error, so that high-precision measurement is realized, so as to reduce temperature drift.
Embodiment 2
1 and Fig. 3, measures liquid level using the principle of sectional capacitance, the change of different medium can be adapted to automatically in conjunction with the embodiments
Change, the height of oil water mixture can be measured, measuring principle is as follows：
If in pure water, first paragraph metal electrode conductor 11 is that aerial capacitance is C1L in zero point liquid level, complete
The full capacitance being immersed in measured medium is C1H, and the height of first paragraph is H1, when measured medium is in the range of first paragraph,
The no-load voltage ratio of first paragraph is that δ 1 is,
δ 1=(C1H-C1L)/H1
The like, the no-load voltage ratio δ 2 of second segment metallic conductor is,
δ 2=(C2H-C2L)/H2
δ 3=(C3H-C3L)/H3
δ 4=(C4H-C4L)/H4
δ 5=(C5H-C5L)/H5
Due to this five sections of electric capacity materials of interior electrode 7, height, width, length is all just the same, i.e. H1=H2=H3=H4
=H5, then can obtain：In pure water, the no-load voltage ratio of this five sections of metal electrode conductors is identical, i.e. δ 1=δ 2=δ 3=δ 4=δ 5.
According to no-load voltage ratio, we measure the existing height to interface in oil water mixture, the process of the oil water mixture
Pressure is 5.0MPa, and the present embodiment measurement object is the height of lower floor's liquid B in immiscible mixing liquid：The density ratio water of oil
It is small, then lower floor's liquid B be water, supernatant liquid A for oil.
According to formula δ=(CxH-CxL)/H, no-load voltage ratio is calculated,
The conductance of oil is compared with water, and oily conductance is very small, therefore the capacitance of oil is compared with the capacitance of water, can
To ignore, when tested oil water mixture any position in whole sensor, we can measure simultaneously
Every section of no-load voltage ratio,
δ 1=(C1-C1L)/H1,
δ 2=(C2-C2L)/H2,
δ 3=(C3-C3L)/H3,
δ 4=(C4-C4L)/H4,
δ 5=(C5-C5L)/H5,
H1=H2=H3=H4=H5 in above calculating formula, C1, C2, C3, C4, C5 are the electric capacity of every section of metal electrode conductor
Value, C1L, C2L, C3L, C4L, i.e. C5L are every section of aerial capacitance of zero point liquid level, when liquid is in whole sensor
In any position when we measure every section of no-load voltage ratio simultaneously, by the no-load voltage ratio for judging every section of metallic conductor successively from top to bottom
Between difference, when difference arrive greatly we setting value when, just illustrate this section of the inside contain oil composition；As shown in figure 3,
The δ 2 of oil water mixture be worth substantially be worth than δ 1 it is small, then illustrate oil water mixture interface be located at interior electrode second segment, then tie
Close Hx/H=(Cx-CxL)/(CxH-CxL) this formula in embodiment 1, it can be deduced that second segment metallic conductor is submerged in water
Height, i.e.,
H2x=[H2* (C2-C2L)]/Δ x,
Then Hx '=H1+H2x, Hx ' be lower floor's liquid B be water total height, during the height of lower floor's water is oil water mixture
The height of interface.
Embodiment 3
As shown in figure 4, the measuring circuit principle of the liquid level emasuring device is as follows：
Wherein, the effect of the power supply processing unit in Fig. 4 is that external power source is changed into internal operating voltages.
First, the temperature of fluid to be measured is detected by temperature sensor PT100 and temperature measuring circuit, test solution
The capacitance of body by liquid-immersed metallic conductor electrode 11 by being detected, the metallic conductor electrode 11 includes first paragraph
Capacitance measurement circuit, second segment capacitance measurement circuit, the 3rd section of capacitance measurement circuit, the 4th section of capacitance measurement circuit and the 5th
Section capacitance measurement circuit；
It is then detected that temperature and capacitance value by CPU processing units carry out data acquisition and processing (DAP)；Wherein, at CPU
Managing unit includes memory cell, output buffer cell, noise suppression unit and watchdog unit；The effect of memory cell is to deposit
Store up data；The effect for exporting buffer cell is output protection data；The effect of noise suppressed is anti-interference, lightning protection and anti-quiet
Electricity；The effect of watchdog unit is to prevent from crashing；
Finally, the data for CPU processing units being gathered and being handled are exported by RS232 output units.
Embodiment 4
As shown in figure 5, at the correct position being arranged on liquid level emasuring device by following steps on automotive oil tank：
(1) centre bore at one is opened in the center on fuel tank top using a diameter of 22mm hole making drill；
(2) using a diameter of 4.2mm drill bit, centered on the centre bore on above-mentioned fuel tank top, in the week of the centre bore
Enclose and uniformly open circular hole at five；
(3) using S5 thread tapping, by flange by with the pad that mechanical seal is acted on be fixed on above-mentioned centre bore and
At five at circular hole；
(4) spanner is used, liquid level emasuring device is fixed on to the center on fuel tank by above-mentioned flange.
As shown in Figure 5 and Figure 6, by above-mentioned steps, liquid level emasuring device is arranged on the correct position on automotive oil tank
Place, described correct position should close proximity to fuel tank center, the center is front and rear and left and right the center of fuel tank
Position.
As shown in fig. 6, when automobile climb and fall, the pasta in fuel tank can be tilted therewith, the oil on the right side of the fuel tank edge
Face is highly that the fuel head on the left of 777.9mm, the fuel tank edge is 270.7mm, and the height of the fuel tank center is
527.4mm；Fuel head on the right side of above-mentioned fuel tank edge is bigger than normal than actual fuel head, and the pasta on the left of above-mentioned fuel tank edge is high
Degree is less than normal than actual fuel head, and the closest actual fuel head of the height of fuel tank center；Therefore liquid level emasuring device is located at
During fuel tank edge, the measured value of the measurement apparatus can be caused bigger than normal or less than normal；When the measurement apparatus is located at fuel tank center, its
The closest actual fuel head of measured value.
In a word, liquid level emasuring device should be arranged close to the center of fuel tank, so as to reduce automobile in climb and fall
Cause the influence of pasta inclination and pasta fluctuation to the measurement result of the liquid level emasuring device.
Although the present invention is described in detail with reference to the foregoing embodiments, for those skilled in the art,
It can still modify to the technical scheme described in foregoing embodiments, or which part technical characteristic is carried out etc.
With replacing, within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc. should be included in this
Within the protection domain of invention.
Claims (9)
1. at a kind of liquid level emasuring device of the adaptive range of sectional capacitance, including electrode stem, the signal being connected with electrode stem
Manage device (3) and the upper lid (1) for protection signal processing unit (3), the electrode stem by electrode connecting parts (4) with it is upper
Cover (1) connection, it is characterised in that：The electrode stem includes interior electrode (7) and external electrode (6), and the interior electrode (7) passes through sealing
Circle (8) is connected with external electrode (6), and temperature sensor (9), the interior electricity are provided between the interior electrode (7) and external electrode (6)
Pole (7) includes at least one support round rod and at least five is distributed in the metal electrode conductor of the diverse location on support round rod
(11) constitute, drawn between each metallic conductor (11) by least one wire；The electrode stem bottom is provided with plug (10)；
Water joint (2) is provided between the upper lid (1) and electrode connecting parts (4).
2. the liquid level emasuring device of the adaptive range of sectional capacitance according to claim 1, it is characterised in that：The interior electricity
The metal electrode conductor (11) for the diverse location that pole (7) is evenly distributed on support round rod by a support round rod and 5 is constituted,
Drawn between each metal electrode conductor (11) by a wire.
3. the liquid level emasuring device of the adaptive range of sectional capacitance according to claim 1, it is characterised in that：The metal
Spacing between electrode conductor (11) is 0.2-1.0mm.
4. the liquid level emasuring device of the adaptive range of sectional capacitance according to claim 1, it is characterised in that：The metal
Spacing between electrode conductor (11) is 0.6mm.
5. the liquid level emasuring device of the adaptive range of sectional capacitance according to claim 1, it is characterised in that：The support
A diameter of 8.0mm of pole.
6. the liquid level emasuring device of the adaptive range of sectional capacitance according to claim 1, it is characterised in that：The metal
The length of electrode conductor (11), width, height and material all same.
7. a kind of application process of the liquid level emasuring device of the adaptive range of sectional capacitance, it is characterised in that：By claim 1-6
In the adaptive range of any one sectional capacitance liquid level emasuring device be applied to immiscible mixing liquid interface liquid level survey
Amount.
8. the application process of the liquid level emasuring device of the adaptive range of sectional capacitance according to claim 7, its feature exists
In：The immiscible mixing liquid is oil water mixture.
9. the application process of the liquid level emasuring device of the adaptive range of sectional capacitance according to claim 7, its feature exists
In：The pressure process of the mixing liquid is 4.0-6.0MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710272896.2A CN107192425A (en) | 2017-04-24 | 2017-04-24 | A kind of liquid level emasuring device and application process of the adaptive range of sectional capacitance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710272896.2A CN107192425A (en) | 2017-04-24 | 2017-04-24 | A kind of liquid level emasuring device and application process of the adaptive range of sectional capacitance |
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ID=59872284
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| CN201710272896.2A Pending CN107192425A (en) | 2017-04-24 | 2017-04-24 | A kind of liquid level emasuring device and application process of the adaptive range of sectional capacitance |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108204847A (en) * | 2017-12-27 | 2018-06-26 | 中国航发四川燃气涡轮研究院 | A kind of aircraft engine oil liquid level and oil product one measurement sensor and method |
| CN116878612A (en) * | 2023-07-07 | 2023-10-13 | 天津大学 | Multiphase interface liquid level measurement method and system |
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| CN201828306U (en) * | 2010-07-23 | 2011-05-11 | 北京昆仑海岸传感技术中心 | Rigid subsection capacitance liquid level sensor |
| CN203298828U (en) * | 2013-01-21 | 2013-11-20 | 北京乾达源科技有限公司 | Device for measuring liquid level and boundary level of tank body |
| CN103913207A (en) * | 2014-03-24 | 2014-07-09 | 郑州科达自动化工程有限公司 | High-precision variable-scan oil level measurement sensor with matrix capacitor |
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| CN2480818Y (en) * | 2001-06-20 | 2002-03-06 | 威海北洋电气集团股份有限公司仪器分公司 | Flexible quasisection capacitance material position sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108204847A (en) * | 2017-12-27 | 2018-06-26 | 中国航发四川燃气涡轮研究院 | A kind of aircraft engine oil liquid level and oil product one measurement sensor and method |
| CN108204847B (en) * | 2017-12-27 | 2020-04-07 | 中国航发四川燃气涡轮研究院 | Aero-engine lubricating oil liquid level and oil product integrated measurement sensor and method |
| CN116878612A (en) * | 2023-07-07 | 2023-10-13 | 天津大学 | Multiphase interface liquid level measurement method and system |
| CN116878612B (en) * | 2023-07-07 | 2024-03-22 | 天津大学 | Multiphase interface liquid level measurement method and system |
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Application publication date: 20170922 |