CN2443351Y - Multi-interface liquid level testing system - Google Patents
Multi-interface liquid level testing system Download PDFInfo
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- CN2443351Y CN2443351Y CN 00261115 CN00261115U CN2443351Y CN 2443351 Y CN2443351 Y CN 2443351Y CN 00261115 CN00261115 CN 00261115 CN 00261115 U CN00261115 U CN 00261115U CN 2443351 Y CN2443351 Y CN 2443351Y
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- liquid level
- electrode plate
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- receiving electrode
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Abstract
The utility model discloses a multiple interface liquid level detecting system, which mainly comprises a sine wave signal generator, a multi-electrode capacitance sensor, a detecting circuit, an analog-digital conversion card and a computer. While a sine wave signal is added to an exciting electrode of the multi-electrode capacitance sensor, a receiving electrode can obtain a detecting signal; after the detecting signal is conversed, amplified, rectified and filtered via the current pressure, the obtained DC signal passes through a programmable gain amplifier, and the signal finally obtained is the detected capacitance value; the interfaces among different media can be obtained by comparing the variation of the capacitance value on each receiving electrode.
Description
The utility model relates to a kind of detection system of surveying many interfaces liquid level, in particular for the measurement of oil, gas, water three phase separation jar median surface liquid level.
Oil well production be the potpourri of gas, oil, water and suspension, this just needs to separate water outlet and suspension obtains gas and crude oil products.The operation of leggy separation vessel mainly depends on the interface identification between out of phase, especially will monitor containment to froth level.Because sharply the foam that produces can reduce separation efficiency, even causes separation vessel to quit work.Except that the ray detector of lcltracerco, also there is not a kind of foam detector on the existing market.With other liquid level sensor, as: light, discharge capacity, pressure, ultrasound wave and ray are compared, and capacitive transducer has the characteristics of suitable temperature and pressure limit and no moving-member.Yet common capacitive transducer has only an electrode to survey, and just there are two problems in this: the one, and it needs temperature compensation; The 2nd, it can not surpass the above detection in an interface.
The purpose of this utility model provides a kind of position that not only can determine many interfaces, can also survey the liquid level detection system of froth bed position in the separating tank.
For realizing above-mentioned task, many interfaces of the present utility model liquid level detection system, it comprises sine wave signal generator, capacitive transducer, testing circuit, analog-to-digital conversion card and computing machine.At above-mentioned signal generator, provide the square-wave signal of a 320KHZ by crystal oscillator, be divided into the signal of five different frequencies through counter, control five address ends of programable read only memory.Owing in read-only storage able to programme, imported the several number certificate in advance.Read data in the programable read only memory successively by controlling these five address ends.By digital to analog converter the data-switching that reads is become the 10KHZ analog sine wave signal again, this signal amplifies through amplifier, makes the crest voltage of signal reach 20VP-P.Then the sine wave signal that amplifies is delivered on one group of cmos switch, by the control cmos switch sine wave signal is added to the public of multielectrode capacitance sensor and excites on the electroplax.Because different media has different specific inductive capacity, thereby can obtain the detection signal of a correspondence on certain receiving electrode of multielectrode capacitance sensor.This signal is sent to again on another group cmos switch, by the control to this group of cmos switch, obtains the signal that comes from a certain electrode of sensor.This signal is the stream pressure converter of circuit after testing, AC amplifying circuit, full wave rectifier, obtain the AC harmonic signal of a DC DC voltage and a 20KHZ, pass through the AC harmonic signal of low pass filter filters out 20KHZ again, by programmable gain amplifier this DC signal is done further amplification at last, deliver in the computing machine through analog-to-digital conversion card.This simulating signal is exactly the capacitance that records.By comparing the capacitance on each receiving electrode, just can obtain the interface between the different medium, the image at interface just is presented on the monitor.
Above-mentioned many interfaces liquid level detection system, the sensor that is adopted are multielectrode capacitance sensors.This sensor is made up of exciting electrode plate, receiving electrode plate and sleeve pipe.Described sleeve pipe is divided into the electrode storehouse of two symmetries by two dividing plates, and is provided with the guide groove that can insert exciting electrode plate and receiving electrode plate in this storehouse.Distance between these two battery lead plates is 13mm, put into sleeve pipe after available epoxy seal.
The positive plate face of the exciting electrode plate of multielectrode capacitance sensor is provided with a public exciting electrode, and the exciting electrode plate also can be an independently single electrode of a kind of polylith certainly.
The positive plate face of the receiving electrode plate of multielectrode capacitance sensor is provided with a plurality of independently receiving electrodes, and the backboard face is furnished with many leads.Every lead links to each other with a receiving electrode by a conducting ring.Multi-pole plug on the other end of lead and the receiving electrode plate joins.
Many interfaces liquid level detection system has overcome the defective that common electric capacity liquid level sensor has only an electrode detector owing to adopted a kind of multielectrode capacitance sensor.Therefore, this detection system is to surveying many interfacial mediums, especially to surveying the many interfaces liquid level in the crude oil three phase separation jar, not only can determine gas/oil, oil/water, water/sludge thing interface according to their differing dielectric constants, can also come froth bed between detected gas and the oil by analyzing capacitance variations.
Advantage of the present utility model: the one, do not need temperature compensation; The 2nd, can measure the liquid level at many interfaces, the 3rd, the arrangement of sensitive capacitive electrode can be determined the accurate position at interface according to material at the relative different aspect the specific inductive capacity.
The utility model will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is the circuit diagram of many interfaces of the utility model liquid level detection system;
Fig. 2 is the sleeve structure sectional view of multielectrode capacitance sensor shown in Figure 1;
Fig. 3 is a multielectrode capacitance sensor exciting electrode plate synoptic diagram shown in Figure 1;
Fig. 4 is a multielectrode capacitance sensor receiving electrode plate front plate synoptic diagram shown in Figure 1;
Fig. 5 is Fig. 4 multielectrode capacitance sensor receiving electrode backboard panel synoptic diagram;
The circuit of the described many interfaces of Fig. 1 liquid level detection system, it comprises sine wave signal generator, multielectrode capacitance sensor, testing circuit.
Sine wave signal generator is to provide the square-wave signal of a 320KHZ to output to 1 pin of counter (74LS393) from its 2 pin by crystal oscillator.Counter (74LS393) is divided into square-wave signal the signal of five different frequencies from output terminal 3,4,5,6,11 pin, delivers to address end 10,11,12,13,14 pin of programable read only memory PROM (74S288).Owing in programable read only memory PROM (74S288), imported the several number certificate in advance, read data among the programable read only memory PROM (74S288) successively by controlling these five address ends, eight bit data is delivered to 11,10,9,8,7,6,5,4 pin of digital to analog converter (PM7524) through 2,3,4,5,6,7,8 pin 1,, this eight bit data is converted to a 10KHZ analog sine wave signal, and deliver to from its 1 pin and to make this sine wave signal crest voltage reach 20VP-P the amplifying circuit.2 through amplifying circuit 6 pin export 2,6,10,14 input ends of cmos switch thereafter.CMOS output terminal 3,7,11,16 pin connect on the public exciting electrode of multielectrode capacitance sensor C.The control signal of coming from analog-to-digital conversion card is connected on cmos switch control end 1,8,9,16 pin respectively, with the conducting of control cmos switch with close.
Also be provided with one group of cmos switch in testing circuit, input end 2,6,10,14 pin of this switch join with the corresponding receiving electrode of multielectrode capacitance sensor C.The output terminal of cmos switch is 3,7,11,16.The control signal of coming from analog-to-digital conversion card is connected on control end 1,8,9,15 pin of cmos switch respectively, the conducting of controlling this group cmos switch with close, thereby the signal of control from a certain receiving electrode of sensor C.2 pin that the signal of this reception is sent to the I-V converter convert to behind the voltage signal from the output of 6 pin, pass through resistance R
22 pin to the AC amplifier amplify, and export through resistance R from 6 pin
3To full wave rectifier 2 pin rectifications.The signal of rectification is made up of the AC harmonic signal of a DC voltage and a 20KHZ, and from its 6 pin through resistance R
42 pin to the next stage amplifier amplify once more.The secondary amplifying signal is from 6 pin output process resistance R
5, R
6To the 3 pin input of two-stage Butterworth LPF, take down the AC harmonic signal of 20KHZ, make the DC d. c. voltage signal output to 8 pin of programmable gain amplifier (PGA202) through 6 pin.1, the 2 foot control systems gain of this gain amplifier (PGA202) is amplified, and 12 pin output signals are to analog-to-digital conversion card, and this digital signal that obtains at last is exactly the measured signal of multielectrode capacitance sensor C.Analog-to-digital conversion card joins by interface and computing machine.
By Fig. 2,3,4,5 as can be known, liquid level detection system described multielectrode capacitance sensor C in many interfaces is provided with the sleeve pipe 1 of a cylindricality.Be provided with two parallel dividing plates 2 in the middle of this sleeve pipe 1, sleeve pipe 1 be separated into the electrode storehouse 3 of two symmetries.In these two electrode storehouses 3, be provided with the guide groove 4 that can insert exciting electrode plate 5 and receiving electrode plate 6 respectively.Guide groove 4 is near dividing plate 3 medial surfaces.After two electrode plate (5,6) are inserted in the electrode storehouse 3, use epoxy sealing.
Above-mentioned exciting electrode plate 5, its front plate are provided with a rectangular public exciting electrode 7 that is slightly less than this plate area.This exciting electrode 7 also can be made a plurality of independently single electrodes.On the front plate of receiving electrode plate 6, be provided with a plurality of independently single receiving electrodes 8.Be furnished with a plurality of leads 9 on the backboard face of this plate with receiving electrode 8 equal numbers.A conducting ring 10 is all arranged on the receiving electrode 8.Every lead 9 one end join with corresponding receiving electrode 8 by conducting ring, and the other end of lead 9 is connected on the multi-pole plug 11 on the receiving electrode plate 6.Exciting electrode plate 5 and receiving electrode plate 6 usefulness PCB materials are made.
The sensor of this structure can be docking together several sensors with spline structure according to the specific (special) requirements of test condition, satisfies test job.In addition, the sensor of butt joint also can be removed easily, uses separately.The multielectrode capacitance sensor of many interfaces of the utility model liquid level detection system, its exciting electrode are made a public electrode, and receiving electrode is made the electrode of a more piece.
Claims (5)
1, a kind of many interfaces liquid level detection system, it comprises sine wave signal generator, capacitive transducer, testing circuit, analog-to-digital conversion card and computing machine, it is characterized in that: be connected to counter (74LS393), programmable read-only memory (74S288) and the described amplifier out of digital to analog converter (PM7524) and connect one group of cmos switch input end between the oscillatory circuit of this signal generator and amplifying circuit, the public exciting electrode (7) of the output terminal of this switch and multielectrode capacitance sensor (C) joins; The input end of another group cmos switch and the receiving electrode (8) of multielectrode capacitance sensor (C) join, this group cmos switch output termination testing circuit; Back level at testing circuit is connected to programmable gain amplifier (PGA202).
2, by the described many interfaces of claim 1 liquid level detection system, it is characterized in that: multielectrode capacitance sensor (C) is provided with the sleeve pipe (1) of a cylindricality, this sleeve pipe (1) is divided into the electrode storehouse (3) of two symmetries by two dividing plates (2), dividing plate (2) limit in electrode storehouse (3) is provided with guide groove (4), exciting electrode plate (5) and receiving electrode plate (6) are inserted in respectively in separately the guide groove (4), and distance is 13mm. between exciting electrode plate (5) and the receiving electrode plate (6).
3, by claim 1,2 described many interfaces liquid level detection systems, it is characterized in that: the positive plate face of exciting electrode plate (5) is provided with a public exciting electrode (7).
4, by the described many interfaces of claim 3 liquid level detection system, it is characterized in that: the positive plate face of exciting electrode plate (5) can be established a plurality of independently exciting electrodes (7).
5, by claim 1,2 described many interfaces liquid level detection systems, it is characterized in that: the positive plate face of receiving electrode plate (6) is provided with a plurality of independently receiving electrodes (8), be furnished with many leads (9) on the backboard face, every lead (9) one ends join by corresponding conducting ring (10) and receiving electrode (8), and the multi-pole plug (8) on the other end and the receiving electrode plate (6) joins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00261115 CN2443351Y (en) | 2000-10-28 | 2000-10-28 | Multi-interface liquid level testing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00261115 CN2443351Y (en) | 2000-10-28 | 2000-10-28 | Multi-interface liquid level testing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2443351Y true CN2443351Y (en) | 2001-08-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00261115 Expired - Fee Related CN2443351Y (en) | 2000-10-28 | 2000-10-28 | Multi-interface liquid level testing system |
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| CN (1) | CN2443351Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8281655B2 (en) | 2009-04-03 | 2012-10-09 | Eaton Corporation | Fuel gauging system utilizing a digital fuel gauging probe |
| CN103241759A (en) * | 2012-02-13 | 2013-08-14 | 山东众诚钡盐股份有限公司 | Barium chloride reaction kettle with electrode type liquid level meter |
| CN103776076A (en) * | 2014-01-27 | 2014-05-07 | 西安交通大学 | Full-automatic continuous adjustable extractor hood adopting capacitance-type sensor |
| CN108603782A (en) * | 2015-12-24 | 2018-09-28 | 埃尔特克有限公司 | Horizontal device and method for detecting medium |
| CN110726457A (en) * | 2019-10-24 | 2020-01-24 | 中国核动力研究设计院 | Integrated waste resin liquid level interface measuring system |
| CN115790775A (en) * | 2022-11-24 | 2023-03-14 | 广州黑格智造信息科技有限公司 | Liquid level detection equipment, method and device and storage medium |
-
2000
- 2000-10-28 CN CN 00261115 patent/CN2443351Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8281655B2 (en) | 2009-04-03 | 2012-10-09 | Eaton Corporation | Fuel gauging system utilizing a digital fuel gauging probe |
| CN103241759A (en) * | 2012-02-13 | 2013-08-14 | 山东众诚钡盐股份有限公司 | Barium chloride reaction kettle with electrode type liquid level meter |
| CN103776076A (en) * | 2014-01-27 | 2014-05-07 | 西安交通大学 | Full-automatic continuous adjustable extractor hood adopting capacitance-type sensor |
| CN103776076B (en) * | 2014-01-27 | 2017-01-04 | 西安交通大学 | Use the full-automatic continuous adjustable range hood of capacitance type sensor |
| CN108603782A (en) * | 2015-12-24 | 2018-09-28 | 埃尔特克有限公司 | Horizontal device and method for detecting medium |
| CN108603782B (en) * | 2015-12-24 | 2021-08-03 | 埃尔特克有限公司 | Device and method for detecting the level of a medium |
| CN110726457A (en) * | 2019-10-24 | 2020-01-24 | 中国核动力研究设计院 | Integrated waste resin liquid level interface measuring system |
| CN110726457B (en) * | 2019-10-24 | 2021-10-01 | 中国核动力研究设计院 | Integrated waste resin liquid level interface measuring system |
| CN115790775A (en) * | 2022-11-24 | 2023-03-14 | 广州黑格智造信息科技有限公司 | Liquid level detection equipment, method and device and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |