CN203148514U - Capacitive self-adaptation liquid level sensor - Google Patents
Capacitive self-adaptation liquid level sensor Download PDFInfo
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- CN203148514U CN203148514U CN 201320039457 CN201320039457U CN203148514U CN 203148514 U CN203148514 U CN 203148514U CN 201320039457 CN201320039457 CN 201320039457 CN 201320039457 U CN201320039457 U CN 201320039457U CN 203148514 U CN203148514 U CN 203148514U
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- inner core
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- level sensor
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Abstract
The utility model discloses a capacitive self-adaptation liquid level sensor applied to the field of measuring. The capacitive self-adaptation liquid level sensor comprises a capacitive liquid level sensor body and a transmitter arranged at the top end of the capacitive liquid level sensor body through an installation flange. The capacitive liquid level sensor body is composed of a measuring inner tube and a stainless steel outer tube. A liquid level sensing device connected with the transmitter through a wire and used for detecting actual dielectric constant change of measured liquid are arranged on the outer wall of the measuring inner tube. The capacitive self-adaptation liquid level sensor transmits signals to the transmitter through the liquid level sensing device, the transmitter can achieve calibration of measuring parameters, measurement errors caused by change of the dielectric constant of the measured liquid are removed, and accurate measurement of the liquid level height can be ensured.
Description
Technical field
The utility model relates to a kind of liquid level sensor, specifically a kind of capacitance level transducer.
Background technology
In the industrial automation production run, in order to realize the production of high-efficiency high-quality safely and fast, often need accurately measure liquid level, automatically adjust then, Based Intelligent Control, make production run control more become perfect.Capacitance level transducer because widely applicable, easy for installation, do not have advantages such as movable or elastomeric element, obtained widespread use.
The capacitance detecting element of capacitance level transducer is to carry out work according to the principle of cylindrical shape capacitor, and as sensing element, the height that reacts liquid level by the variation of condenser capacity changes capacitance level transducer with capacitor.The capacitor of capacitance level transducer is made up of two insulation and coaxial cylindrical interior battery lead plate and dispatch from foreign news agency pole plate, has opening outside on the battery lead plate fluid to be measured is flowed between inside and outside pole plate.When filling between two electrodes when being the fluid to be measured of e with the specific inductive capacity, the electric capacity between two electrodes is C=2 π eL/lnD/d, and in the formula, L is the liquid level of fluid to be measured, and D is the diameter of dispatch from foreign news agency pole plate, and d is the diameter of interior battery lead plate.The capacitor of capacitance level transducer parameter D, d and e in measuring process are constant substantially, therefore can calculate liquid level L by the capacitance C that measures.
In actual applications, capacitance level transducer makes the interior battery lead plate of capacitor with an elongated metal bar, constitute the dispatch from foreign news agency pole plate of capacitor with interior electrode insulation and coaxial metal outer cylinder, therefore the D in the measure equation and d are fixing when capacitance level transducer is made, and can not change in actual applications.But specific inductive capacity e is the characteristic by fluid to be measured to be determined, when fluid to be measured performance and the temperature of environment of living in when changing in use, specific inductive capacity e tends to change thereupon, if still use original specific inductive capacity e to calculate this moment, the liquid level L value of the fluid to be measured that calculates so will produce deviation with the actual liquid level height, cause measurement result inaccurate, further cause automatic control system adjusting mistake, influence industrial quality, cause damage.
The utility model content
The utility model technical issues that need to address provide a kind of condenser type self-adaptation liquid level sensor, and the measuring error so that the change of eliminating because of the fluid to be measured specific inductive capacity brings reaches the purpose that accurate measurement liquid level changes.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is:
Condenser type self-adaptation liquid level sensor, comprise that the bottom is provided with inlet opening, the upper end is provided with the capacitance level transducer body of venthole and is arranged on capacitance level transducer body top for the transmitter of the calculated signals real-time level that transmits according to the capacitance level transducer body by mounting flange, described capacitance level transducer body is by measuring inner core and forms with the stainless steel urceolus of measuring inner core insulation and coaxial setting, and the outer wall of measurement inner core fixedly installs that at least one is connected with transmitter by lead, liquid level perceptron for detection of the actual dielectric constant values variation of fluid to be measured.
The liquid level perceptron can be the sensor that adopts multi-form measuring principles such as condenser type, photo-electric, ultrasound wave.When the liquid level perceptron adopts capacitive measuring principle, except the function of carrying out the liquid level perception, can also have the function of liquid level gauging.
Further improvement of the utility model is: measure inner core by being fixedly installed on the interior tube stent of measuring on the inner tank theca and stainless steel urceolus location, the bottom of measuring inner core by being arranged on capacitance level transducer body below bottom bracket and the bottom of stainless steel urceolus locate; Inlet opening is arranged on the corresponding position of measuring inner core and stainless steel urceolus on the axial direction of bottom bracket.
Further improvement of the utility model is: the corresponding measurement between inner core and the stainless steel urceolus in the radial direction of bottom bracket arranges reinforcement.
Further improvement of the utility model is: transmitter adopts the PSOC3 processor.
Further improvement of the utility model is: the output signal of transmitter is digital signal and/or simulating signal, and wherein simulating signal is 0-5V voltage signal or 0-20mA current signal.
Because the technical progress of having adopted technique scheme, the utility model to obtain is:
Condenser type self-adaptation liquid level sensor, the liquid level perceptron in that the measurement inner core of capacitance level transducer body is installed is used for detecting in real time the variation of the specific inductive capacity of fluid to be measured.This liquid level perceptron can be installed in the optional position of capacitance level transducer, and when the liquid level of fluid to be measured arrived the position at liquid level perceptron place, transmitter can be realized the specific inductive capacity that detects fluid to be measured is calibrated; When installation is a plurality of, can repeatedly calibrate measurement parameter.Eliminated the measuring error that the change because of the fluid to be measured specific inductive capacity brings, guaranteed that accurate measurement liquid level changes.
Measure between inner core and the stainless steel urceolus and position by tube stent in adopting and bottom bracket, and bottom bracket arranges reinforcement, fundamentally guaranteed to measure and insulated between inner core and the stainless steel urceolus and both coaxial setting.
Inlet opening is arranged on the corresponding position of measuring inner core and stainless steel urceolus on the axial direction of bottom bracket, and fluid to be measured enters the capacitance level transducer body from inlet opening, has increased the measurement range of sensor, accurately measures the position of minimum liquid level.
Transmitter adopts the PSOC3 high-performance processor, the PSOC unit of the analog-and digital-peripheral components array of integrated configuration around a proprietary MCU micro-control unit.Circuit such as signal processing circuit, interface circuit, power device are integrated on the chip, collection digital programmable array, simulation programmable array, single-chip microcomputer are one, effectively solved the interface problem of digital circuit and mimic channel, powerful, required external resource is few, circuit is reliable and stable, and cost is low, efficient is high.
The transmitter output signal comprises simulating signal and/or digital signal, simulating signal is 0-5V voltage signal or 0-20mA current signal, digital signal is passed through RS485, RS232, the output of CAN bus can directly link to each other with integrated control system or liquid level display unit, need not to carry out the secondary conversion, easy to use, applied widely.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is schematic bottom view of the present utility model.
Wherein, 1, transmitter, 2, inlet opening, 3, bottom bracket, 4, mounting flange, 5, venthole, 6, the stainless steel urceolus, 7, measure inner core, 8, interior tube stent, 9, the liquid level perceptron, 10, reinforcement.
Embodiment
Be described in further details below in conjunction with the utility model of embodiment:
Condenser type self-adaptation liquid level sensor, as shown in Figure 1, comprise capacitance level transducer body, mounting flange 4 and transmitter 1, the bottom of capacitance level transducer body arranges inlet opening 2, the upper end is provided with venthole 5, transmitter 1 is on the top of capacitance level transducer body, transmitter 1 is according to the calculated signals real-time level of capacitance level transducer body transmission, mounting flange 4 not only is used for connecting capacitance level transducer body and transmitter 1, also is used for condenser type self-adaptation liquid level sensor is fixedly installed to the chamber wall of splendid attire fluid to be measured.The capacitance level transducer body is formed by measuring inner core 7 and stainless steel urceolus 6, measure the interior battery lead plate that inner core 7 constitutes capacitor, stainless steel urceolus 6 constitutes the dispatch from foreign news agency pole plate of capacitor, measuring inner core 7 has lead to be connected with transmitter with stainless steel urceolus 6, fixedly install liquid level perceptron 9 on the outer wall of measurement inner core 7, liquid level perceptron 9 is connected with transmitter 1 by lead, and for detection of the variation of fluid to be measured dielectric constant values, liquid level perceptron 9 can arrange one or more.In the present embodiment, on the outer wall of measurement inner core 7 a liquid level perceptron 9 is set.
The interior tube stent 8 of capacitance level transducer body is fixedly mounted on to be measured between inner core 7 and the stainless steel urceolus 6, one or more is arranged, bottom bracket 3 is fixedly mounted on the bottom of measuring between inner core 7 and the stainless steel urceolus 6, position measuring inner core 7 and stainless steel urceolus 6, guaranteed insulation and coaxial between measurement inner core 7 and the stainless steel urceolus 6.Have inlet opening 2 on the axial direction of bottom bracket 3, inlet opening 2 is corresponding with the position of measuring inner core 7 and stainless steel urceolus 6.The corresponding interval of measuring between inner core 7 and the stainless steel urceolus 6 in the radial direction of bottom bracket 3 arranges reinforcement 10.
Transmitter 1 adopts the PSOC3 high-performance processor.The PSOC unit of the analog-and digital-peripheral components array of integrated configuration around a MCU micro-control unit.Solved the interface problem of digital circuit and mimic channel.
The output signal of transmitter 1 is digital signal and/or simulating signal, and wherein simulating signal is 0 ~ 5V voltage signal or 0 ~ 20mA current signal.
Principle of work of the present utility model is as described below.
During use, at first the capacitance level transducer body is placed in the detected liquid, the capacitance level transducer body is fixedly mounted on the chamber wall of fluid to be measured by mounting flange 4, fluid to be measured enters into the capacitance level transducer body by inlet opening 2, and the intrinsic air of capacitance level transducer is discharged by venthole 5.Preset the basic specific inductive capacity e1 of fluid to be measured in the transmitter 1.
When the liquid level of fluid to be measured arrives the installation site of liquid level perceptron 9, liquid level perceptron 9 transmits liquid level to transmitter 1 and arrives switching signal, therefore transmitter 1 can be according to the basic specific inductive capacity e1 of the fluid to be measured that presets and the capacitance C that measures, further by calculating the height L of fluid to be measured liquid level.
But because the contingent variation of specific inductive capacity, therefore there are certain deviation in the height L of the fluid to be measured liquid level that records and the setting height(from bottom) of liquid level perceptron 9.
By formula C=2 π eL/lnD/d, can get e=2 π CL/lnD/d, because the setting height(from bottom) of liquid level perceptron 9 is known, so transmitter 1 can calculate the specific inductive capacity e2 of this moment according to the setting height(from bottom) of the capacitance C that measures and liquid level perceptron 9.
Further draw the dielectric correction factor α=e2/e1 of fluid to be measured.
Transmitter 1 is mended this dielectric correction factor α in the formula in follow-up measurement is calculated, and has eliminated the measuring error that the change because of the fluid to be measured specific inductive capacity brings, and has guaranteed to accurately calculate actual liquid level.
Simultaneously, transmitter 1 also can be that digital signal and/or simulating signal are transported to control system with the liquid level information translation of fluid to be measured, is convenient to the control system reference.
Install when a plurality of at the diverse location of measuring inner core 7 when liquid level perceptron 9, transmitter 1 is realized the repeatedly correction to dielectric coefficient in the course of the work, guarantees the accuracy of whole measuring process.
Claims (5)
1. condenser type self-adaptation liquid level sensor, comprise that the bottom is provided with inlet opening (2), the upper end is provided with the capacitance level transducer body of venthole (5) and is arranged on capacitance level transducer body top for the transmitter (1) of the calculated signals real-time level that transmits according to the capacitance level transducer body by mounting flange (4), described capacitance level transducer body is characterized in that by measuring inner core (7) and forming with the stainless steel urceolus (6) of measuring inner core (7) insulation and coaxial setting: the outer wall of described measurement inner core (7) fixedly installs that at least one is connected with transmitter (1) by lead, liquid level perceptron (9) for detection of the actual dielectric constant values variation of fluid to be measured.
2. condenser type self-adaptation liquid level sensor according to claim 1, it is characterized in that: described measurement inner core (7) is measured the bottom of inner core (7) and is located with the bottom of stainless steel urceolus (6) by the bottom bracket (3) that is arranged on capacitance level transducer body below by being fixedly installed on interior tube stent (8) and stainless steel urceolus (6) location of measuring on inner core (7) outer wall; Described inlet opening (2) is arranged on the corresponding position of measuring inner core (7) and stainless steel urceolus (6) on the axial direction of bottom bracket (3).
3. condenser type self-adaptation liquid level sensor according to claim 2 is characterized in that: between the corresponding measurement inner core (7) in the radial direction of described bottom bracket (3) and the stainless steel urceolus (6) reinforcement (10) is set.
4. according to claim 1 or 2 each described condenser type self-adaptation liquid level sensors, it is characterized in that: described transmitter (1) adopts the PSOC3 processor.
5. condenser type self-adaptation liquid level sensor according to claim 3, it is characterized in that: the output signal of described transmitter (1) is digital signal and/or simulating signal, wherein simulating signal is 0 ~ 5V voltage signal or 0 ~ 20mA current signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320039457 CN203148514U (en) | 2013-01-24 | 2013-01-24 | Capacitive self-adaptation liquid level sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320039457 CN203148514U (en) | 2013-01-24 | 2013-01-24 | Capacitive self-adaptation liquid level sensor |
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| CN203148514U true CN203148514U (en) | 2013-08-21 |
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| CN 201320039457 Expired - Fee Related CN203148514U (en) | 2013-01-24 | 2013-01-24 | Capacitive self-adaptation liquid level sensor |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104634416A (en) * | 2014-12-18 | 2015-05-20 | 大连海事大学 | Capacitance type ship oil tank liquid level measuring device |
| CN106352948A (en) * | 2016-11-23 | 2017-01-25 | 深圳市阿达电子有限公司 | Novel capacitive-sensor liquid level detection system and method |
| CN106352943A (en) * | 2016-10-13 | 2017-01-25 | 吉林师范大学 | Liquid level measuring device |
| CN106404111A (en) * | 2015-07-29 | 2017-02-15 | 上海凡宜科技电子有限公司 | Correction method for capacitive material level sensing device and anti-interference method for multiple capacitive material level sensing devices |
| CN107560687A (en) * | 2017-09-04 | 2018-01-09 | 太仓望虞机械科技有限公司 | A kind of intelligent fuel level sensor |
| CN109459113A (en) * | 2018-12-28 | 2019-03-12 | 成都市美金迪不锈钢制品有限公司 | A kind of shell structure of LNG gas cylinder capacitance level transducer |
| CN110095168A (en) * | 2019-05-21 | 2019-08-06 | 温州大学 | A kind of capacitance level transducer |
| CN111398544A (en) * | 2020-04-08 | 2020-07-10 | 江西怡杉环保股份有限公司 | Water quality on-line detector and metering system thereof |
| CN110095168B (en) * | 2019-05-21 | 2024-04-16 | 温州大学 | Capacitive liquid level sensor |
-
2013
- 2013-01-24 CN CN 201320039457 patent/CN203148514U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103913207B (en) * | 2014-03-24 | 2017-02-22 | 郑州科达自动化工程有限公司 | High-precision variable-scan oil level measurement sensor with matrix capacitor |
| CN104634416B (en) * | 2014-12-18 | 2018-01-12 | 大连海事大学 | Condenser type ship Oil Tank liquid surface measuring device |
| CN104634416A (en) * | 2014-12-18 | 2015-05-20 | 大连海事大学 | Capacitance type ship oil tank liquid level measuring device |
| CN106404111B (en) * | 2015-07-29 | 2019-07-05 | 上海凡宜科技电子有限公司 | The anti-interference method of the bearing calibration of capacitance charge level sensing device and plural device |
| CN106404111A (en) * | 2015-07-29 | 2017-02-15 | 上海凡宜科技电子有限公司 | Correction method for capacitive material level sensing device and anti-interference method for multiple capacitive material level sensing devices |
| CN106352943A (en) * | 2016-10-13 | 2017-01-25 | 吉林师范大学 | Liquid level measuring device |
| CN106352948A (en) * | 2016-11-23 | 2017-01-25 | 深圳市阿达电子有限公司 | Novel capacitive-sensor liquid level detection system and method |
| CN106352948B (en) * | 2016-11-23 | 2023-04-07 | 深圳市阿达电子有限公司 | Liquid level detection system and detection method of capacitive sensor |
| CN107560687A (en) * | 2017-09-04 | 2018-01-09 | 太仓望虞机械科技有限公司 | A kind of intelligent fuel level sensor |
| CN109459113A (en) * | 2018-12-28 | 2019-03-12 | 成都市美金迪不锈钢制品有限公司 | A kind of shell structure of LNG gas cylinder capacitance level transducer |
| CN110095168A (en) * | 2019-05-21 | 2019-08-06 | 温州大学 | A kind of capacitance level transducer |
| CN110095168B (en) * | 2019-05-21 | 2024-04-16 | 温州大学 | Capacitive liquid level sensor |
| CN111398544A (en) * | 2020-04-08 | 2020-07-10 | 江西怡杉环保股份有限公司 | Water quality on-line detector and metering system thereof |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20180124 |