CN201583315U - Capacitor array type liquid level sensor probe and liquid sensor using same - Google Patents
Capacitor array type liquid level sensor probe and liquid sensor using same Download PDFInfo
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- CN201583315U CN201583315U CN2010201127810U CN201020112781U CN201583315U CN 201583315 U CN201583315 U CN 201583315U CN 2010201127810 U CN2010201127810 U CN 2010201127810U CN 201020112781 U CN201020112781 U CN 201020112781U CN 201583315 U CN201583315 U CN 201583315U
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Abstract
The utility model provides a capacitor array type liquid level sensor probe and a liquid sensor using same, relating to a liquid level sensor probe and a liquid level sensor using the same. The utility model solves the problem that the measuring device of the existing capacitor type liquid level sensor has low measuring accuracy. In the capacitor array type liquid level sensor probe, a first pole plate consists of N same No.1 electrode blocks, and a second pole plate consists of M same No.2 electrode blocks; the second pole plate is used as a common pole plate of the first pole plate; and each No.1 electrode block respectively forms a capacitor with a No.2 electrode block on the second pole plate. In the liquid level sensor using the sensor probe, a single chip microcomputer controls multiple paths of analogue switches to select the capacitors one by one, and the capacitor detecting circuit detects the capacitance value of each capacitor, sends the detected result into the single chip microcomputer for processing and output after being converted by a V/I conversion circuit. The utility model is applicable to the process of liquid level measurement.
Description
Technical scheme
The utility model relates to a kind of liquid level sensor probe and uses the liquid level sensor of this probe.
Background technology
The measurement mechanism of existing capacitance level transducer is the difference by the testee specific inductive capacity, convert the liquid level variation to electric capacity and carry out level gauging, this just needs to measure accurate capacitor's capacity and could realize, but because capacitance level gauge adopts the immersion measurement method, reasons such as liquid sagging cause the error of capacitor's capacity bigger, and external interference to the capacitor's capacity influence also clearly; Simultaneously, little capacitance detecting network and digital processing circuit are subjected to the influence of external condition also to cause the error of capacitor's capacity bigger, and above-mentioned reason causes the measuring accuracy of measurement mechanism of existing capacitance level transducer low.
The utility model content
The utility model is for the low problem of the measuring accuracy of the measurement mechanism that solves existing capacitance level transducer, thereby has proposed the liquid level sensor that a kind of capacitor array formula liquid level sensor is popped one's head in and used this probe.
Capacitor array formula liquid level sensor probe, it comprises two insulcretes, and it also comprises first pole plate and second pole plate, and described first pole plate and second pole plate are separately fixed on two insulcretes; First pole plate is made up of a N identical electrode block, and the spacing between adjacent two electrode blocks is equal; Second pole plate is made up of M No. two identical electrode blocks; Described second pole plate is the public pole plate of first pole plate, No. two corresponding composition of electrode block electric capacity in electrode block in described first pole plate and second pole plate; N is an integer, any one value among M=1, the 2......N, and N is the integral multiple of M.
Liquid level sensor based on said apparatus, it also comprises transmitter, described transmitter comprises multiway analog switch, capacitive detection circuit, single-chip microcomputer and V-I change-over circuit, described Single-chip Controlling multiway analog switch is selected electric capacity one by one, capacitive detection circuit detects the appearance value of each electric capacity, and testing result is sent into single-chip microcomputer handle the back by V/I change-over circuit conversion back output.
The utility model in use, the probe of liquid level sensor is stretched in the liquid, because the difference of the specific inductive capacity of the specific inductive capacity of liquid and air causes each little electric capacity to change in subsurface appearance value, by detecting the position that little capacitor's capacity changes, thereby judge liquid level.The utility model need not to measure concrete capacitor's capacity, has avoided capacitor's capacity changed by ectocine and causes the low and excessive problem of zero point drift of measuring accuracy; Measuring accuracy height of the present invention can not only be measured the liquid level of liquid accurately, can also effectively differentiate the interphase of the multilayer liquid of different medium, measures the liquid level of every kind of liquid.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment one; Fig. 2 is the structural representation of the utility model embodiment two; Fig. 3 is the structural representation of the utility model embodiment three; The structural representation of Fig. 4 the utility model embodiment four; Fig. 5 is the signal flow synoptic diagram of the transmitter of the utility model embodiment five; Fig. 7 is the structural representation of the utility model embodiment five liquid level sensors.
Embodiment
Embodiment one, capacitor array formula liquid level sensor probe, it comprises two insulcretes 4, and it also comprises first pole plate 1 and second pole plate 2, and described first pole plate 1 and second pole plate 2 are separately fixed on two insulcretes 4; First pole plate 1 is made up of a N identical electrode block 1-1, and the spacing between adjacent two electrode block 1-1 is equal; Second pole plate 2 is made up of M No. two identical electrode block 2-1; Described second pole plate 2 is public pole plates of first pole plate 1, No. two corresponding composition of electrode block 2-1 electric capacity in electrode block 1-1 in described first pole plate 1 and second pole plate 2; N is an integer, any one value among M=1, the 2......N, and N is the integral multiple of M.
In the present embodiment, the quantity of an electrode block 1-1 is the integral multiple of No. two electrode block 2-1 quantity, and for example 3 times, wherein per four electrode block 1-1 and No. two electrode blocks are oppositely arranged, and its structure as shown in Figure 1.
Embodiment two, this embodiment is described in conjunction with Fig. 2, this embodiment is with the difference of embodiment one described a kind of capacitor array formula liquid level sensor probe, M=1, N the electric capacity of a corresponding composition of No. two electrode block 2-1 in No. one electrode block 1-1 of the N in described first pole plate 1 and second pole plate 2.
Embodiment three, this embodiment is described in conjunction with Fig. 3, this embodiment is with the difference of embodiment one described a kind of capacitor array formula liquid level sensor probe, M=N, and the spacing between adjacent two No. two electrode block 2-1 equates; Each No. two electrode block 2-1 all is oppositely arranged with an electrode block 1-1, and the individual electrode block 1-1 of the N in first pole plate 1 and individual N the electric capacity of No. two corresponding compositions of electrode block 2-1 of the M in second pole plate 2.
Embodiment four, this embodiment is described in conjunction with Fig. 4, this embodiment is with the difference of embodiment one described a kind of capacitor array formula liquid level sensor probe, M=N, and the spacing between adjacent two No. two electrode block 2-1 equates; No. two electrode block 2-1 on second pole plate 2 and an electrode block 1-1 on first pole plate 1 are crisscross arranged, and the N in first pole plate 1 electrode block 1-1 and individual N the electric capacity of No. two corresponding compositions of electrode block 2-1 of the M in second pole plate 2.
In first pole plate 1 and second pole plate 2 second pole plate 2 with respect to first pole plate 1 along L distance of orientation translation, the scope of L 0 to a pole plate length and gap length and between.
Spacing between adjacent two No. two electrode block 2-1 on spacing between adjacent two electrode block 1-1 on first pole plate 1 in embodiment three and the embodiment four and second pole plate 2 equates.
Embodiment five, based on the liquid level sensor of the described a kind of capacitor array formula liquid level sensor probe of embodiment one, it also comprises transmitter 3, described transmitter 3 comprises multiway analog switch 3-1, capacitive detection circuit 3-2, single-chip microcomputer 3-3 and V-I change-over circuit 3-4, described single-chip microcomputer 3-3 control multiway analog switch 3-1 selects electric capacity one by one, capacitive detection circuit 3-2 detects the appearance value of each electric capacity, and testing result is sent into single-chip microcomputer 3-3 handle the back by V/I change-over circuit 3-4 conversion back output.
Present embodiment is that a pole plate in the electric capacity is divided into several small electrode pieces, and vertically forms a line, and keeps equidistantly, and another pole plate is as public pole plate.Testing circuit adopts the detection method based on charge-discharge principle, because the specific inductive capacity and the dielectric constant of air difference of liquid are very big, therefore, each little electric capacity can be undergone mutation with subsurface appearance value on liquid level.Liquid level is judged in the position of adopting single-chip microcomputer detection capacitor's capacity to undergo mutation, and need not to measure concrete capacitor's capacity, and this causes the not high and excessive problem of zero point drift of measuring accuracy with regard to having been avoided capacitor's capacity changed by ectocine.Simultaneously, according to difference to the measuring accuracy index request, length and width that can each little electric capacity of appropriate design and the spacing between them, thus guarantee the accuracy measured.Has corrosive liquid height by adopting the capacitor plate of different materials, can measuring.
Structure of the present utility model as shown in Figure 7, first pole plate 1 and second pole plate 2 are fixed on housing 10 inboards with a fixed head 11 by screw 12 respectively, the space between first pole plate 1 and second pole plate 2 is the liquid inflow region.Transmitter 3 is installed in the housing 10 terminal cavitys that form.Use O-ring seal 13 sealings between the cavity of described housing 10 ends and the sensor probe.Have the interface 14 that is electrically connected on the cavity of described housing 10 ends, the link tester of electrode slice and transmitter associated components is crossed the interface 14 that is electrically connected and is linked to each other with the outside.
The difference of the liquid level sensor of embodiment six, this embodiment and embodiment five described a kind of capacitor array formula liquid level sensor probes is, capacitive detection circuit 3-2 comprises square wave generation circuit 3-2-1, charge-discharge circuit 3-2-2, C/V change-over circuit 3-2-3, low-pass filter circuit 3-2-4 and amplifies comparator circuit 3-2-5 that the waveform signal output terminal of described square wave generation circuit 3-2-1 is connected with the signal input part of charge-discharge circuit 3-2-2; The signal output part of described charge-discharge circuit 3-2-2 is connected with the signal input part of C/V change-over circuit 3-2-3; The signal output part of C/V change-over circuit 3-2-3 is connected with the signal input part of low-pass filter circuit 3-2-4; The signal output part of low-pass filter circuit 3-2-4 is connected with the signal input part that amplifies comparator circuit 3-2-5, and the signal input part of square wave generation circuit 3-2-1 is as the signal input part of capacitive detection circuit 3-2; Amplify the signal output part of the signal output part of comparator circuit 3-2-5 as capacitive detection circuit 3-2.
Capacitive detection circuit 3-2 adopts charge-discharge principle, is realized by square wave generation circuit 3-2-1, charge-discharge circuit 3-2-2, amplification comparator circuit 3-2-5.Advantage based on the charge-discharge principle testing circuit is anti-stray capacitance and stray capacitance.
The difference of the liquid level sensor of embodiment seven, this embodiment and embodiment five or six described a kind of capacitor array formula liquid level sensor probes is that single-chip microcomputer 3-3 is that model is the single-chip microcomputer of the XC866 of company of Infineon.
Claims (7)
1. capacitor array formula liquid level sensor is popped one's head in, and it comprises two insulcretes (4), it is characterized in that: further comprising first pole plate (1) and second pole plate (2), and described first pole plate (1) and second pole plate (2) are separately fixed on two insulcretes (4); First pole plate (1) is made up of a N identical electrode block (1-1), and the spacing between adjacent two electrode blocks (1-1) equates; Second pole plate (2) is made up of M identical No. two electrode blocks (2-1); Described second pole plate (2) is the public pole plate of first pole plate (1), the corresponding composition of No. two electrode blocks (2-1) electric capacity in the electrode block (1-1) in described first pole plate (1) and second pole plate (2); N is an integer, any one value among M=1, the 2......N, and N is the integral multiple of M.
2. capacitor array formula liquid level sensor according to claim 1 probe is characterized in that M=1, N the electric capacity of the corresponding composition of No. two electrode blocks (2-1) in the N in described first pole plate (1) electrode block (1-1) and second pole plate (2).
3. capacitor array formula liquid level sensor probe according to claim 1 it is characterized in that M=N, and the spacing between adjacent two No. two electrode blocks (2-1) equates; Each No. two electrode block (2-1) all is oppositely arranged with an electrode block (1-1), and the individual electrode block (1-1) of the N in first pole plate (1) and individual N the electric capacity of the corresponding composition of No. two electrode blocks (2-1) of the M in second pole plate (2).
4. capacitor array formula liquid level sensor probe according to claim 1 it is characterized in that M=N, and the spacing between adjacent two No. two electrode blocks (2-1) equates; Electrode block (1-1) on No. two electrode blocks (2-1) on second pole plate (2) and first pole plate (1) is crisscross arranged, and M N electric capacity of the corresponding composition of No. two electrode blocks (2-1) in individual electrode block (1-1) of the N in first pole plate (1) and second pole plate (2).
5. use the liquid level sensor of the described capacitor array formula of claim 1 liquid level sensor probe, it is characterized in that: further comprising transmitter (3), described transmitter (3) comprises multiway analog switch (3-1), capacitive detection circuit (3-2), single-chip microcomputer (3-3) and V-I change-over circuit (3-4), described single-chip microcomputer (3-3) control multiway analog switch (3-1) is selected electric capacity one by one, capacitive detection circuit (3-3) detects the appearance value of each electric capacity, and testing result is sent into single-chip microcomputer (3-3) handle the back by V/I change-over circuit (3-4) conversion back output.
6. the liquid level sensor of capacitor array formula liquid level sensor probe according to claim 5, it is characterized in that capacitive detection circuit (3-2) comprises square wave generation circuit (3-2-1), charge-discharge circuit (3-2-2), C/V change-over circuit (3-2-3), low-pass filter circuit (3-2-4) and amplifies comparator circuit (3-2-5), the waveform signal output terminal of described square wave generation circuit (3-2-1) is connected with the signal input part of charge-discharge circuit (3-2-2); The signal output part of described charge-discharge circuit (3-2-2) is connected with the signal input part of C/V change-over circuit (3-2-3); The signal output part of C/V change-over circuit (3-2-3) is connected with the signal input part of low-pass filter circuit (3-2-4); The signal output part of low-pass filter circuit (3-2-4) is connected with the signal input part that amplifies comparator circuit (3-2-5), and the signal input part of square wave generation circuit (3-2-1) is as the signal input part of capacitive detection circuit (3-2); Amplify the signal output part of the signal output part of comparator circuit (3-2-5) as capacitive detection circuit (3-2).
7. according to the liquid level sensor of claim 5 or 6 described capacitor array formula liquid level sensor probes, it is characterized in that single-chip microcomputer (3-3) is that model is the single-chip microcomputer of XC866.
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| CN2010201127810U CN201583315U (en) | 2010-02-10 | 2010-02-10 | Capacitor array type liquid level sensor probe and liquid sensor using same |
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| CN2010201127810U CN201583315U (en) | 2010-02-10 | 2010-02-10 | Capacitor array type liquid level sensor probe and liquid sensor using same |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944287A (en) * | 2012-11-23 | 2013-02-27 | 水利部南京水利水文自动化研究所 | Capacitance type flexible electronic tide staff |
| WO2014019289A1 (en) * | 2012-07-31 | 2014-02-06 | 付建国 | Capacitance induction-type automatic tidal observation device |
| CN106123765A (en) * | 2016-08-05 | 2016-11-16 | 南海西部石油油田服务（深圳）有限公司 | A kind of medium emulsion layer thickness measurement equipment for three phase separator |
| CN107532937A (en) * | 2015-04-08 | 2018-01-02 | 全耐塑料高级创新研究公司 | Device for measuring the level of a liquid |
| CN107843312A (en) * | 2017-12-19 | 2018-03-27 | 国丰新能源江苏有限公司 | The immersion liquid level gauge of the big medium liquid level of measurement fluctuation |
| CN108593723A (en) * | 2018-04-04 | 2018-09-28 | 华北电力大学 | A kind of AD7746 capacitance acquisition systems based on timing method |
| CN108886178A (en) * | 2016-03-24 | 2018-11-23 | 弗劳莱特控制有限公司 | Liquid level sensor for battery monitoring system |
| CN111094909A (en) * | 2017-07-20 | 2020-05-01 | 埃尔特克有限公司 | Device for detecting the level of a medium |
| CN111094908A (en) * | 2017-07-20 | 2020-05-01 | 埃尔特克有限公司 | Device for detecting the level of a medium |
| CN111397701A (en) * | 2020-03-20 | 2020-07-10 | 西安交通大学 | Capacitive liquid level sensor and calibration method and measurement method thereof |
| CN111837017A (en) * | 2018-03-09 | 2020-10-27 | 考特克斯·特克斯罗恩有限公司及两合公司 | Operating fluid container with capacitive fill level detection |
| CN112729051A (en) * | 2020-12-08 | 2021-04-30 | 广东化一环境科技有限公司 | Medium thickness detection device |
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2010
- 2010-02-10 CN CN2010201127810U patent/CN201583315U/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014019289A1 (en) * | 2012-07-31 | 2014-02-06 | 付建国 | Capacitance induction-type automatic tidal observation device |
| CN102944287A (en) * | 2012-11-23 | 2013-02-27 | 水利部南京水利水文自动化研究所 | Capacitance type flexible electronic tide staff |
| CN107532937A (en) * | 2015-04-08 | 2018-01-02 | 全耐塑料高级创新研究公司 | Device for measuring the level of a liquid |
| CN108886178B (en) * | 2016-03-24 | 2021-07-13 | 弗劳莱特控制有限公司 | Liquid level sensor for battery monitoring system |
| CN108886178A (en) * | 2016-03-24 | 2018-11-23 | 弗劳莱特控制有限公司 | Liquid level sensor for battery monitoring system |
| CN106123765A (en) * | 2016-08-05 | 2016-11-16 | 南海西部石油油田服务（深圳）有限公司 | A kind of medium emulsion layer thickness measurement equipment for three phase separator |
| CN106123765B (en) * | 2016-08-05 | 2018-11-13 | 南海西部石油油田服务（深圳）有限公司 | A kind of medium for three phase separator emulsifies layer thickness measuring instrument |
| CN111094908A (en) * | 2017-07-20 | 2020-05-01 | 埃尔特克有限公司 | Device for detecting the level of a medium |
| CN111094909A (en) * | 2017-07-20 | 2020-05-01 | 埃尔特克有限公司 | Device for detecting the level of a medium |
| CN107843312A (en) * | 2017-12-19 | 2018-03-27 | 国丰新能源江苏有限公司 | The immersion liquid level gauge of the big medium liquid level of measurement fluctuation |
| CN111837017A (en) * | 2018-03-09 | 2020-10-27 | 考特克斯·特克斯罗恩有限公司及两合公司 | Operating fluid container with capacitive fill level detection |
| CN111837017B (en) * | 2018-03-09 | 2023-09-22 | 考特克斯·特克斯罗恩有限公司及两合公司 | Working fluid tank with capacitance determining filling level of working fluid tank |
| CN108593723A (en) * | 2018-04-04 | 2018-09-28 | 华北电力大学 | A kind of AD7746 capacitance acquisition systems based on timing method |
| CN111397701A (en) * | 2020-03-20 | 2020-07-10 | 西安交通大学 | Capacitive liquid level sensor and calibration method and measurement method thereof |
| CN111397701B (en) * | 2020-03-20 | 2022-03-01 | 西安交通大学 | Capacitive liquid level sensor and calibration method and measurement method thereof |
| CN112729051A (en) * | 2020-12-08 | 2021-04-30 | 广东化一环境科技有限公司 | Medium thickness detection device |
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Granted publication date: 20100915 Termination date: 20190210 |
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| CF01 | Termination of patent right due to non-payment of annual fee |