CN102116663A - Gradient type capacitance sensor - Google Patents
Gradient type capacitance sensor Download PDFInfo
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- CN102116663A CN102116663A CN 201010608944 CN201010608944A CN102116663A CN 102116663 A CN102116663 A CN 102116663A CN 201010608944 CN201010608944 CN 201010608944 CN 201010608944 A CN201010608944 A CN 201010608944A CN 102116663 A CN102116663 A CN 102116663A
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Abstract
The invention discloses a gradient type capacitance sensor, which belongs to the field of water temperature and water level measuring devices. The sensor comprises a plastic component, a measurement controller, a capacitance grounding electrode, a capacitance measuring electrode and a capacitance amending module, wherein the capacitance grounding electrode, the capacitance measuring electrode and the capacitance amending module form a U-shaped measuring structure, heat-shrinkage sleeves are sheathed outside the capacitance measuring electrode and the capacitance amending module, the heat-shrinkage sleeve is sheathed on the part of the capacitance grounding electrode, which is near to the capacitance amending module, a temperature sensor is arranged in the capacitance grounding electrode, and the capacitance grounding electrode, the capacitance measuring electrode, the capacitance amending module and the temperature sensor are connected with the measurement controller through conducting wires respectively. As the gradient type capacitance sensor is the sensor based on capacitance induction principle for measuring water level of a solar water heater, and the U-shaped measuring structure is adopted, the sensor can realize gradient type water level precise measurement and transmission for the solar water heater, and has the advantages of less possibility of scale formation, long service life and stability in work.
Description
Technical field
The present invention relates to water temperature and level measurement device, particularly a kind of gradual change type capacitive transducer that is used for solar water heater.
Background technology
Sun power belongs to clean reproducible energy, has disposable input, saving, safety, advantage such as reliable, is developed by people gradually.At present, conduct vigorous propaganda under the favourable prerequisite of building a conservation-minded society in country, solar energy optical-thermal is used very big market potential, the solar water heater popularity rate all increases with higher amplitude every year, being favored by real estate developer, urban construction department gradually, even some local government is by forcing or subsidies measures are promoted sun power.
What grow up is solar Water Heater Control System thereupon.Solar water heater automatic control system makes that the solar water heater use is more convenient, more saves worry.Present water-temperature water-level sensor mainly is to measure water level by the resistive voltage simulating signal.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
Existing water-temperature water-level sensor in this hot and humid rugged surroundings of solar water container, and because the signal that causes easily after the hard water fouling shows instability, causes shortcomings such as this sensor weak point in serviceable life, job insecurity.Therefore a kind of temperature and level measurement device that can keep stability under rugged surroundings need be provided.
Summary of the invention
In order to overcome the described sensor of prior art, the problem that under rugged surroundings, can't keep stability of existence, the embodiment of the invention provides a kind of gradual change type capacitive transducer.Described technical scheme is as follows:
A kind of gradual change type capacitive transducer, comprise plastic assembly, be located at the measurement controller in the described plastic assembly, the capacity earth electrode and the capacitance measurement electrode that are tightly connected with described plastic assembly, the electric capacity correcting module that links to each other with described capacitance measurement electrode with described capacity earth electrode, described capacity earth electrode, described capacitance measurement electrode and described electric capacity correcting module three form the U-shaped measurement structure, wherein, the outside sheathed heat-shrinkable T bush of described capacitance measurement electrode and described electric capacity correcting module, described capacity earth electrode is near the sheathed heat-shrinkable T bush of part of described electric capacity correcting module, described capacity earth electrode is provided with temperature-sensitive sticker, described capacity earth electrode, described capacitance measurement electrode, described electric capacity correcting module and described temperature-sensitive sticker link to each other with described measurement controller by lead respectively.
Particularly, described electric capacity correcting module comprises sensing element, and first insulating part and second insulating part that are connected to described sensing element two ends, described first insulating part links to each other with described capacity earth electrode, described second insulating part links to each other with the metal connecting piece of filling in described sensing element by bolt, and described second insulating part also links to each other with described capacitance measurement electrode.
Particularly, described first insulating part and described second insulating part all adopt teflon to make.
Particularly, the described sensing element in the described electric capacity correcting module, described capacity earth electrode and described capacitance measurement electrode all adopt stainless-steel tube to make.
Particularly, described temperature-sensitive sticker is the LM35 temperature-sensitive sticker.
Particularly, described heat-shrinkable T bush is a pyrocondensation Teflon sleeve pipe.
Particularly, described plastic assembly adopts nylon to make.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: compared to existing technology, the present invention is based on the sensor that capacitance induction principle is measured the solar water heater water level, the U-shaped measurement structure that adopts, can realize that solar water heater gradual change type water level accurately measures and become the sensor that send transmission, have less scaling, the life-span long and the advantage of working stability.
Description of drawings
Fig. 1 is the structural representation of the described gradual change type capacitive transducer of the embodiment of the invention;
Fig. 2 is the structural representation of the described electric capacity correcting module of the embodiment of the invention;
Fig. 3 is the parts explosion of Fig. 2.
Among the figure: 1 electric capacity correcting module, 1.1 sensing elements, 1.2 metal connecting pieces, 1.3 second insulating parts, 1.4 bolts, 1.5 draw lead, 1.6 first insulating parts;
2 heat-shrinkable T bushs, 3 capacity earth electrodes, 4 capacitance measurement electrodes, 5 temperature-sensitive stickers, 6 plastic assemblies, 7 measure controller, 8 output signal lines.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
As shown in Figure 1, the described a kind of gradual change type capacitive transducer of the embodiment of the invention, be to be used for the water temperature of solar water heater and the underneath type measurement mechanism of water level, described sensor comprises plastic assembly 6, be located at the measurement controller 7 in the described plastic assembly 6, the capacity earth electrode 3 and the capacitance measurement electrode 4 that are tightly connected with described plastic assembly 6, the electric capacity correcting module 1 that links to each other with described capacitance measurement electrode 4 with described capacity earth electrode 3, described capacity earth electrode 3, described capacitance measurement electrode 4 and described electric capacity correcting module 1 three form the U-shaped measurement structure, wherein, described capacitance measurement electrode 4 and described electric capacity correcting module 1 outside sheathed heat-shrinkable T bush 2, described capacity earth electrode 3 is arranged with heat-shrinkable T bush 2 near the part of described electric capacity correcting module 1, described capacity earth electrode 3 is provided with temperature-sensitive sticker 5, described capacity earth electrode 3, described capacitance measurement electrode 4, described electric capacity correcting module 1 and described temperature-sensitive sticker 5 link to each other with described measurement controller 7 by lead respectively.
Wherein, the U-shaped structure is not only from effect fixing and that assembling has support and stably measured structure, also guaranteed the isometric, equidistant of capacitance measurement electrode and capacity earth electrode and etc. relative area, in measuring process, the part that is immersed in the water can form certain capacitance, and capacitance was stable when this kind structure had guaranteed to measure electric capacity just, along with the rising of water level, capacitance is approximately linear to be changed, and the data operation aspect is also simplified greatly.So the U-shaped measurement structure can realize solar water heater gradual change type water level and accurately measure and become the sensor that send transmission, have less scaling, the life-span long and the advantage of working stability.
The measuring principle of the embodiment of the invention is: referring to Fig. 1, under anhydrous state, measurement controller 7 reads out the initial capacitance value of this moment and exports as anhydrous signal, being full of medium gradually between two electrodes along with the rising electric capacity of water level is water, electric capacity also can be linear change along with the rising of water level, measure controller 7 calculates water level by the measure analog electric capacity digital signal, and the modulation of the PWM by controller is from signal wire 8 outputs, and output signal is transported to the Long-distance Control instrument with the temperature amount and shows.
In this example,, between described capacity earth electrode 3 and the plastic assembly 6, between described capacitance measurement electrode 4 and the plastic assembly 6, preferably combine and realized waterproof and fixing jointly by sealing-plug and plastic assembly 6 referring to Fig. 1.The preferred silica gel of described sealing-plug has better guaranteed sealing property and ageing resistance.
As shown in Figure 2, also can be referring to Fig. 3, particularly, described electric capacity correcting module 1 (can referring to Fig. 1) comprises sensing element 1.1, and first insulating part 1.6 and second insulating part 1.3 that are connected to described sensing element 1.1 two ends, described first insulating part 1.6 links to each other with described capacity earth electrode 3, and described second insulating part 1.3 links to each other with the metal connecting piece 1.2 of filling in described sensing element 1.1 by bolt 1.4, and described second insulating part 1.3 also links to each other with described capacitance measurement electrode 4.Wherein, twining on the bolt 1.4 and drawing lead 1.5.In this example, make capacity earth electrode 3 and sensing element 1.1 insulation, make the insulation of capacitance measurement electrode 4 and sensing element 1.1, guaranteed the accuracy of measuring by second insulating part 1.3 by first insulating part 1.6.
Particularly, as shown in Figure 3, in this example, described first insulating part 1.6 and second insulating part 1.3 all preferentially adopt teflon to make.During concrete enforcement, described insulation course can adopt any insulating resin.
Particularly, as shown in Figure 2, in this example, preferably described electric capacity correcting module 1 (can referring to Fig. 1) is arranged on the top of described capacitance measurement electrode 4 and described capacity earth electrode 3, and the appearance profile of electric capacity correcting module 1 is set to semicircle.This electric capacity correcting module 1 (can referring to Fig. 1) has not only played the effect of calibration capacitance, but also plays the effect of metalling run out when preventing sensor failure.
Particularly, as shown in Figure 1, the described sensing element 1.1 in the described electric capacity correcting module 1 (can referring to Fig. 1) (can referring to Fig. 2), described capacity earth electrode 3 and described capacitance measurement electrode 4 all preferentially adopt stainless-steel tube to make.
Particularly, as shown in Figure 1, in this example, described temperature-sensitive sticker is preferably the LM35 temperature-sensitive sticker.In this example, temperature-sensitive sticker 5 be placed on the U-shaped pipe in position on the lower side, can measure the temperature of water more accurately.
Particularly, as shown in Figure 1, described heat-shrinkable T bush 2 is preferably pyrocondensation Teflon sleeve pipe, has very low water-intake rate, and the effect that not only has stable electric capacity can also have good resistive connection dirt effect.
Particularly, as shown in Figure 1, the described plastic assembly 6 preferential nylon that adopt are made.
The embodiment of the invention is according to the capacitance induction principle sensed water level, realizes the gradual change type level measuring, and wherein potential electrode adopts two stainless-steel tubes that parallel with ground-electrode, can measure stable capacitance value; Temperature-sensitive sticker be located in the capacity earth electrode in position, better temperature of reaction on the lower side; The outside surface of capacitance measurement electrode, electric capacity correcting module and capacity earth electrode all uses pyrocondensation Teflon sleeve pipe as waterproof sealing, and is less scaling; Therefore, the present invention can realize the accurate measurement of solar water heater water level and become the sensor that send transmission, efficiently solves the shortcoming of the easy fouling of present water-level and water-temperature sensor for solar water heater, life-span weak point, job insecurity.
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 (7)
1. gradual change type capacitive transducer, it is characterized in that, comprise plastic assembly, be located at the measurement controller in the described plastic assembly, the capacity earth electrode and the capacitance measurement electrode that are tightly connected with described plastic assembly, the electric capacity correcting module that links to each other with described capacitance measurement electrode with described capacity earth electrode, described capacity earth electrode, described capacitance measurement electrode and described electric capacity correcting module three form the U-shaped measurement structure, wherein, the outside sheathed heat-shrinkable T bush of described capacitance measurement electrode and described electric capacity correcting module, described capacity earth electrode is near the sheathed heat-shrinkable T bush of part of described electric capacity correcting module, be provided with temperature-sensitive sticker in the described capacity earth electrode, described capacity earth electrode, described capacitance measurement electrode, described electric capacity correcting module and described temperature-sensitive sticker link to each other with described measurement controller by lead respectively.
2. gradual change type capacitive transducer as claimed in claim 1, it is characterized in that, described electric capacity correcting module comprises sensing element, and first insulating part and second insulating part that are connected to described sensing element two ends, described first insulating part links to each other with described capacity earth electrode, described second insulating part links to each other with the metal connecting piece of filling in described sensing element by bolt, and described second insulating part also links to each other with described capacitance measurement electrode.
3. gradual change type capacitive transducer as claimed in claim 1 is characterized in that, described first insulating part and described second insulating part all adopt teflon to make.
4. gradual change type capacitive transducer as claimed in claim 1 is characterized in that, the described sensing element in the described electric capacity correcting module, described capacity earth electrode and described capacitance measurement electrode all adopt stainless-steel tube to make.
5. gradual change type capacitive transducer as claimed in claim 1 is characterized in that, described temperature-sensitive sticker is the LM35 temperature-sensitive sticker.
6. gradual change type capacitive transducer as claimed in claim 1 is characterized in that, described heat-shrinkable T bush is a pyrocondensation Teflon sleeve pipe.
7. as the described gradual change type capacitive transducer of each claim of claim 1-6, it is characterized in that described plastic assembly adopts nylon to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010106089449A CN102116663B (en) | 2010-12-20 | 2010-12-20 | Gradient type capacitance sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106089449A CN102116663B (en) | 2010-12-20 | 2010-12-20 | Gradient type capacitance sensor |
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| CN102116663A true CN102116663A (en) | 2011-07-06 |
| CN102116663B CN102116663B (en) | 2012-05-30 |
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| CN2010106089449A Expired - Fee Related CN102116663B (en) | 2010-12-20 | 2010-12-20 | Gradient type capacitance sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589646A (en) * | 2012-02-10 | 2012-07-18 | 梁支信 | U-shaped capacitive liquid level meter |
| CN106768174A (en) * | 2016-12-29 | 2017-05-31 | 北京遥测技术研究所 | A kind of two-tube flexible capacitance level transducer and its measuring method |
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| DE102005009093A1 (en) * | 2005-02-22 | 2006-09-07 | Benjamin Hoffmeier | Measuring device for determining filling level in metallic or nonmetallic container, comprises measuring capacitance, reference capacitance and full capacitance for calibration |
| CN101128722A (en) * | 2004-12-22 | 2008-02-20 | 因勒纪汽车系统研究公司 | Capacitive liquid level sensor and level-estimation method |
| CN201289396Y (en) * | 2008-10-21 | 2009-08-12 | 皇明太阳能集团有限公司 | Apparatus for measuring water temperature and water level of solar water heater |
| WO2009124606A1 (en) * | 2008-04-10 | 2009-10-15 | Robert Bosch Gmbh | Capacitive measuring probe and method for producing a capacitive measuring probe |
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| CN201909651U (en) * | 2010-12-20 | 2011-07-27 | 皇明太阳能股份有限公司 | Graded type capacitive sensor |
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2010
- 2010-12-20 CN CN2010106089449A patent/CN102116663B/en not_active Expired - Fee Related
Patent Citations (7)
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| CN101128722A (en) * | 2004-12-22 | 2008-02-20 | 因勒纪汽车系统研究公司 | Capacitive liquid level sensor and level-estimation method |
| DE102005009093A1 (en) * | 2005-02-22 | 2006-09-07 | Benjamin Hoffmeier | Measuring device for determining filling level in metallic or nonmetallic container, comprises measuring capacitance, reference capacitance and full capacitance for calibration |
| WO2009124606A1 (en) * | 2008-04-10 | 2009-10-15 | Robert Bosch Gmbh | Capacitive measuring probe and method for producing a capacitive measuring probe |
| CN101672681A (en) * | 2008-09-10 | 2010-03-17 | 海尔集团公司 | Water level measurement device, water level measurement method and water level correction method |
| CN201289396Y (en) * | 2008-10-21 | 2009-08-12 | 皇明太阳能集团有限公司 | Apparatus for measuring water temperature and water level of solar water heater |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102589646A (en) * | 2012-02-10 | 2012-07-18 | 梁支信 | U-shaped capacitive liquid level meter |
| CN102589646B (en) * | 2012-02-10 | 2013-06-19 | 南宁测控自动化科技有限公司 | U-shaped capacitive liquid level meter |
| CN106768174A (en) * | 2016-12-29 | 2017-05-31 | 北京遥测技术研究所 | A kind of two-tube flexible capacitance level transducer and its measuring method |
| CN106768174B (en) * | 2016-12-29 | 2019-05-24 | 北京遥测技术研究所 | The two-tube capacitance level transducer flexible of one kind and its measurement method |
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| CN102116663B (en) | 2012-05-30 |
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