CN101672681A - Water level measurement device, water level measurement method and water level correction method - Google Patents
Water level measurement device, water level measurement method and water level correction method Download PDFInfo
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- CN101672681A CN101672681A CN200810211917A CN200810211917A CN101672681A CN 101672681 A CN101672681 A CN 101672681A CN 200810211917 A CN200810211917 A CN 200810211917A CN 200810211917 A CN200810211917 A CN 200810211917A CN 101672681 A CN101672681 A CN 101672681A
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Abstract
The invention provides a water level measurement device, which comprises an electrode part and a signal processing unit, wherein the electrode part comprises an earthed reference electrode, a measuring electrode and a correction electrode; the length of the reference electrode is equal to that of the measuring electrode; the length of the correction electrode is smaller than that of the referenceelectrode; and at least one end of each of the three electrodes is flushly and mutually fixed; and the signal processing unit which is electrically connected with the electrode part is used for loading a fixed frequency signal to the measuring electrode and the correction electrode, and determining a water level value according to a detected frequency attenuation signal between the reference electrode and the measuring electrode. The invention also provides a water level measurement method and a water level correction method. The use of the device can reduce influences of environmental factorsand obtain continuous and accurate water level values.
Description
Technical field
The present invention relates to a kind of level measurement device and level measuring, bearing calibration.
Background technology
The storage-type household appliances as solar water heater etc., need detect and control water temperature in the water tank and water level.These class household appliances have the higher requirement of ratio to the measuring accuracy of condensate tank of dehumidifier.
Mainly contain two types the level sensor that is used for water level detecting at present, a kind of is capacitance level transducer, and the metal tube of this kind liquid level sensor is connected with terminal box, and its metering circuit adopts mimic channels such as AC bridge circuit and starting of oscillation.This level sensor is subjected to lead length and climatic influences easily, makes poor signal quality, measuring accuracy not high.
Another kind is a resistance-type temperature liquid level measurement mechanism, and this sensor has only a few limit, so can only send block signal, can not obtain continuously accurate water level value.
These two kinds of sensors all require the water in the water tank charged, so just make the easy fouling of sensor surface, and incrustation scale causes various faults easily.And environmental factors such as water quality can influence the versatility of sensor.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of level measurement device, utilizes this device, use to comprise that the equipment of this device and level measuring bearing calibration can reduce Effect of Environmental, obtains continuously accurate water level value.
Level measurement device provided by the invention comprises: electrode part and signal processing unit; The electrode part branch comprises: the reference electrode 101 of a ground connection, a potential electrode 102 and a correcting electrode 103, the equal in length of the length of described reference electrode 101 and potential electrode 102, the length of described correcting electrode 103 is less than the length of reference electrode 101, and at least one end of each evenly interfixes mutually in three electrodes; With the signal processing unit that electrode partly is electrically connected, be used for loading fixed frequency signal, and determine water level value according to the frequency deamplification that detects between reference electrode 101 and the potential electrode 102 to potential electrode 102 and correcting electrode 103.
Wherein, described signal processing unit comprises: detection signal generation unit 301 is used to produce the fixed frequency signal that loads on potential electrode 102, correcting electrode 103; Water level signal detecting unit 302 is used to detect the frequency deamplification between potential electrode 102 and the reference electrode 101, and this deamplification is converted to digital signal; Detection signal converting unit 304 is used for the digital signal that receives is converted to water level value; Described detection signal generation unit 301 is connected with potential electrode 102, correcting electrode 103, and water level signal detecting unit 302 is connected with potential electrode 102, correcting electrode 103 and reference electrode 101; Detection signal converting unit 304 is connected with water level signal detecting unit 302.
Wherein, also comprise: control module is used for the water level value that the shows signal processing unit obtains, and sends steering order according to described water level value.
In addition, described control module comprises: detection signal transmission unit 305 and control signal output unit 306, and wherein, detection signal transmission unit 305 is used for the water level value that measures is transferred to signal output unit 306; Control signal output unit 306 is used to show water level value, and sends steering order according to the water level value that obtains.
Wherein, described electrode surface coats high temperature resistant, corrosion-resistant insulation material 105.
In addition, the end place that is mutually permanently connected of described electrode is provided with packaging part 106.
Preferable, described electrode is made by metal material, and respectively fixing mutually by bracing frame, and support frame as described above is a buckle 104.
Use level measurement device provided by the invention is measured the method for water level, comprising: produce fixed frequency signal and load on potential electrode, correcting electrode; Detect the frequency deamplification between potential electrode and the reference electrode, and this deamplification is converted to digital signal; According to the corresponding relation of unit distance SEA LEVEL VARIATION value and deamplification, the digital signal that receives is converted to water level value.
Use level measurement device provided by the invention is proofreaied and correct the method for water level, comprising: compare lowest detection level measuring value and the lowest detection water level parameter value that prestores; When the absolute value of lowest detection level measuring value and the difference of the lowest detection water level parameter value that prestores greater than zero, then store lowest detection level measuring value, replace the lowest detection water level parameter value that prestores;
Compare warning line measured value and the warning line parameter value that prestores; When the absolute value of warning line measured value and the difference of the warning line parameter value that prestores greater than zero, then storage guard level measuring value is replaced the warning line parameter value that prestores;
Lowest detection water level value and warning line value according to proofreading and correct calculate unit distance SEA LEVEL VARIATION value between lowest detection water level and the warning line, unit distance SEA LEVEL VARIATION parameter value between lowest detection water level that replacement prestores and the warning line.
This shows, utilize level measurement device provided by the invention and level measuring, bearing calibration can reduce environmental factor, the especially influence of water quality obtains continuously accurate water level value.
Description of drawings
Fig. 1 is a level measurement device electrode structure schematic diagram;
Fig. 2 is the level measurement device schematic diagram;
Fig. 3 is a level measurement device electrode position synoptic diagram;
Fig. 4 is the level correction process flow diagram.
Embodiment
Fig. 1 shows level measurement device electrode structure schematic diagram, and as shown in Figure 1, the electrode part separation structure of level measurement device provided by the invention comprises: electrode and lead 107.
Described electrode part branch comprises 102, correcting electrodes 103 of 101, potential electrode of reference electrode of a ground connection, and wherein reference electrode 101 length are identical with potential electrode 102 length, and correcting electrode 103 length are less than reference electrode 101 length.The length of described electrode can be determined according to the size of water receptacle.The top of three electrodes is concordant mutually to be fixed together by being positioned at electrode tip packaging part 106.
Described electrode adopts metal electrode, produces incrustation scale in order to prevent surface of metal electrode, wraps up insulating material 105 high temperature resistant, corrosion at surface of metal electrode.For anti-sealing contacting metal electrode and lead 107, that packaging part 106 adopts too is high temperature resistant, the insulating material 105 of corrosion, for example can adopt silica gel.
Comprise bracing frame in addition, be used for fixing three distance between electrodes.Support frame as described above can be made up of three buckles 104, and a buckle 104 is positioned at electrode tip encapsulation 106 places, a bottom that is positioned at correcting electrode 103, a bottom that is positioned at reference electrode 101 and potential electrode 102.Fix three electrodes each other apart from the unanimity that can guarantee the interelectrode capacitance parameter, determine that water level variable is to get rid of water quality, the outer unique parameter that influences the interelectrode capacitance value of temperature effect.
For realizing measurement, also the temperature sensor (not shown) can be nested in correcting electrode 103 the insides to water temperature.
Fig. 2 is the level measurement device schematic diagram, and with reference to shown in Figure 2, level measurement device provided by the invention comprises: electrode part, signal processing unit and the control module of electrical connection.Signal processing unit is separated with control module, help reducing decay in the signals transmission the influence of measuring accuracy.
Wherein, electrode partly is used for sensed water level; Signal processing unit is used for the detected signal Processing of level measurement device is become water level value; Control module is used for showing concrete water level value according to the signal that receives from signal processing unit, and controls corresponding component according to water level value.
Described signal processing unit comprises: detection signal generation unit 301, water level signal detecting unit 302 and detection signal converting unit 304 can also comprise the temperature signal detecting unit 303 that is connected with temperature sensor; Wherein,
Described detection signal generation unit 301 is connected with ground with potential electrode 102, correcting electrode 103, and water level signal detecting unit 302 is connected with potential electrode 102, correcting electrode 103 and reference electrode 101; Reference electrode 101 also is connected with ground.Water level signal detecting unit 302 all is connected with detection signal converting unit 304 with temperature signal detecting unit 303.
Detection signal generation unit 301, be used to produce fixed frequency signal, and load this fixed frequency signal for potential electrode 102, correcting electrode 103, variation along with water level, capacitance between reference electrode 101 and the potential electrode 102, between reference electrode 101 and the correcting electrode 103 changes thereupon, makes this frequency signal produce certain decay;
Water level signal detecting unit 302 is used to detect the frequency deamplification between potential electrode 102 and the reference electrode 101, by adjusting, filtering, digital-to-analog conversion process this frequency deamplification is converted to digital signal;
Temperature signal detecting unit 303 is used for the parameter value of temperature sensor is converted to digital signal by filtering, digital-to-analog conversion process;
Detection signal converting unit 304 is used for the water temperature signal that receives is converted to water temperature value, determines water level value according to the digital signal of the frequency deamplification correspondence that receives.
Wherein, described control module comprises detection signal transmission unit 305 and control signal output unit 306.Detection signal transmission unit 305 is used for water temperature value, water level value are transferred to control signal output unit 306.
Control signal output unit 306 is used to show water temperature value, water level value, and sends steering order according to the water level value that receives, water temperature value, the control corresponding component, and as water valve, parts such as power supply.
Fig. 3 is a level measurement device electrode position synoptic diagram, 102, the correcting electrodes 103 of 101, potential electrode of reference electrode that comprise a ground connection as shown in the figure, wherein reference electrode 101 length are identical with potential electrode 102 length, and correcting electrode 103 length are less than reference electrode 101 length.The top of three electrodes is concordant mutually.The A point is a peak level, and the B point detects for lowest water level, and the C point is a warning line.
Fig. 4 is the level correction process flow diagram, introduces the process that condensate tank of dehumidifier provided by the invention carries out level correction in detail below with reference to Fig. 3 and Fig. 4.
Below in conjunction with Fig. 1, Fig. 2 and Fig. 3 the level measuring process that level measurement device provided by the invention is applied to solar water heater water tank is introduced.Detection signal generation unit 301 produces fixed frequency signal, potential electrode 102, correcting electrode 103 receive this fixed frequency signal, in the time of before the water level in the water tank arrives the B point, do not have electric capacity between reference electrode 101 and the potential electrode 102, can not exert an influence the signal that loads.Water level rises to more than the B point gradually, and the capacitance between reference electrode 101 and potential electrode 102, reference electrode 101 and the correcting electrode 103 also changes thereupon, makes the fixed frequency signal of loading produce certain decay.Potential electrode 102 and the corresponding signal of reference electrode 101 outputs, water level signal detecting unit 302 detects this frequency deamplification, by adjusting, filtering, digital-to-analog conversion process this frequency deamplification is converted to digital signal; Detection signal converting unit 304 draws water level value according to the pairing digital signal of frequency deamplification that receives according to unit distance SEA LEVEL VARIATION parameter value calculation between B, the C.Detection signal transmission unit 305 is transferred to control signal output unit 306 to the water level value that calculates.Control signal output unit 306 shows the water level value that receives.
When water level arrives the C point, control module determines whether closing water valve according to the model of water tank or postpones the regular hour closes water valve.Thereby reduce because of of the influence of water quality difference by correcting electrode 103, guarantee the accuracy of water level detecting level measuring.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a level measurement device is characterized in that, comprising: electrode part and signal processing unit;
The electrode part branch comprises: the reference electrode of a ground connection (101), a potential electrode (102) and a correcting electrode (103), the equal in length of the length of described reference electrode (101) and potential electrode (102), the length of described correcting electrode (103) is less than the length of reference electrode (101), and at least one end of each evenly interfixes mutually in three electrodes;
With the signal processing unit that electrode partly is electrically connected, be used for loading fixed frequency signal, and determine water level value according to the frequency deamplification that detects between reference electrode (101) and the potential electrode (102) to potential electrode (102) and correcting electrode (103).
2. measurement mechanism according to claim 1 is characterized in that, described signal processing unit comprises:
Detection signal generation unit (301) is used for producing the fixed frequency signal that loads on potential electrode (102), correcting electrode (103);
Water level signal detecting unit (302) is used to detect the frequency deamplification between potential electrode (102) and the reference electrode (101), and this deamplification is converted to digital signal;
Detection signal converting unit (304) is used for the digital signal that receives is converted to water level value;
Described detection signal generation unit (301) is connected with potential electrode (102), correcting electrode (103), and water level signal detecting unit (302) is connected with potential electrode (102), correcting electrode (103) and reference electrode (101); Detection signal converting unit (304) is connected with water level signal detecting unit (302).
3. measurement mechanism according to claim 1 and 2 is characterized in that, also comprises: control module is used for the water level value that the shows signal processing unit obtains, and sends steering order according to described water level value.
4. measurement mechanism according to claim 3 is characterized in that, described control module comprises: detection signal transmission unit (305) and control signal output unit (306), wherein,
Detection signal transmission unit (305) is used for the water level value that measures is transferred to control signal output unit (306);
Control signal output unit (306) is used to show water level value, and sends steering order according to the water level value that obtains.
5. measurement mechanism according to claim 1 is characterized in that, described electrode surface coats high temperature resistant, corrosion-resistant insulation material (105).
6. measurement mechanism according to claim 5 is characterized in that, the place, end that described electrode is mutually permanently connected is provided with packaging part (106).
7. measurement mechanism according to claim 6 is characterized in that described electrode is made by metal material, and respectively fixing mutually by bracing frame, and support frame as described above is buckle (104).
8. the water level measurement method according to the described level measurement device of claim 1 is characterized in that, comprising:
Produce fixed frequency signal and load on potential electrode, correcting electrode;
Detect the frequency deamplification between potential electrode and the reference electrode, and this deamplification is converted to digital signal;
According to the corresponding relation of unit distance SEA LEVEL VARIATION value and deamplification, the digital signal that receives is converted to water level value.
9. the level correction method according to the described level measurement device of claim 1 is characterized in that, comprising:
Compare lowest detection level measuring value and the lowest detection water level parameter value that prestores; When the absolute value of lowest detection level measuring value and the difference of the lowest detection water level parameter value that prestores greater than zero, then store lowest detection level measuring value, replace the lowest detection water level parameter value that prestores;
Compare warning line measured value and the warning line parameter value that prestores; When the absolute value of warning line measured value and the difference of the warning line parameter value that prestores greater than zero, then storage guard level measuring value is replaced the warning line parameter value that prestores;
Lowest detection water level value and warning line value according to proofreading and correct calculate unit distance SEA LEVEL VARIATION value between lowest detection water level and the warning line, unit distance SEA LEVEL VARIATION parameter value between lowest detection water level that replacement prestores and the warning line.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116663A (en) * | 2010-12-20 | 2011-07-06 | 皇明太阳能股份有限公司 | Gradient type capacitance sensor |
| CN102235905A (en) * | 2011-04-08 | 2011-11-09 | 海尔集团公司 | Method for correcting error frequency of water level sensor on washing machine |
| CN103258109A (en) * | 2012-02-15 | 2013-08-21 | 连和政 | Method for real-time correction of water level forecast |
| CN104596611A (en) * | 2015-02-06 | 2015-05-06 | 西安易流物联科技有限公司 | Liquid level sensor |
| CN105928211A (en) * | 2016-05-05 | 2016-09-07 | 盛嘎 | Water heater capable of displaying temperature |
| CN110207789A (en) * | 2018-11-28 | 2019-09-06 | 华帝股份有限公司 | Water level measuring method and device based on water quality |
| CN110809710A (en) * | 2017-06-20 | 2020-02-18 | 应用材料股份有限公司 | Advanced sensor |
| CN111771105A (en) * | 2017-12-28 | 2020-10-13 | 比利澳大利亚私人有限公司 | Capacitive level sensor with automatic calibration device |
| CN112654844A (en) * | 2018-07-13 | 2021-04-13 | 帝肯贸易股份公司 | Device and method for controlling an optical recognition unit by means of capacitive filling level measurement in a liquid container |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5487359A (en) * | 1994-03-09 | 1996-01-30 | Montreuil; Michel | Low amperage electronic milk level detector |
| JP3841239B2 (en) * | 1997-07-14 | 2006-11-01 | 與宗治 丹治 | Capacitive liquid level measuring device |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116663A (en) * | 2010-12-20 | 2011-07-06 | 皇明太阳能股份有限公司 | Gradient type capacitance sensor |
| CN102235905A (en) * | 2011-04-08 | 2011-11-09 | 海尔集团公司 | Method for correcting error frequency of water level sensor on washing machine |
| CN103258109B (en) * | 2012-02-15 | 2016-05-25 | 连和政 | Method for real-time correction of water level forecast |
| CN103258109A (en) * | 2012-02-15 | 2013-08-21 | 连和政 | Method for real-time correction of water level forecast |
| CN104596611B (en) * | 2015-02-06 | 2018-10-23 | 深圳市易流科技股份有限公司 | A kind of liquid level sensor |
| CN104596611A (en) * | 2015-02-06 | 2015-05-06 | 西安易流物联科技有限公司 | Liquid level sensor |
| CN105928211A (en) * | 2016-05-05 | 2016-09-07 | 盛嘎 | Water heater capable of displaying temperature |
| CN110809710A (en) * | 2017-06-20 | 2020-02-18 | 应用材料股份有限公司 | Advanced sensor |
| CN111771105A (en) * | 2017-12-28 | 2020-10-13 | 比利澳大利亚私人有限公司 | Capacitive level sensor with automatic calibration device |
| CN111771105B (en) * | 2017-12-28 | 2023-01-03 | 比利澳大利亚私人有限公司 | Capacitive level sensor with automatic calibration device |
| GB2583268B (en) * | 2017-12-28 | 2023-03-22 | Billi Australia Pty Ltd | Capacitive level sensor having autocalibration facility |
| CN112654844A (en) * | 2018-07-13 | 2021-04-13 | 帝肯贸易股份公司 | Device and method for controlling an optical recognition unit by means of capacitive filling level measurement in a liquid container |
| CN110207789A (en) * | 2018-11-28 | 2019-09-06 | 华帝股份有限公司 | Water level measuring method and device based on water quality |
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| CN101672681B (en) | 2012-09-05 |
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