CN102116663B - Gradient type capacitance sensor - Google Patents
Gradient type capacitance sensor Download PDFInfo
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- CN102116663B CN102116663B CN2010106089449A CN201010608944A CN102116663B CN 102116663 B CN102116663 B CN 102116663B CN 2010106089449 A CN2010106089449 A CN 2010106089449A CN 201010608944 A CN201010608944 A CN 201010608944A CN 102116663 B CN102116663 B CN 102116663B
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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 has very big market potential; Solar water heater popularity rate every year all increases with higher amplitude, and being favored by real estate developer, urban construction department gradually, even some local government is through 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 lean on the resistive voltage simulating signal to measure water level.
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 under rugged surroundings, can keep stability need be provided.
Summary of the invention
In order to overcome the said 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.Said technical scheme is following:
A kind of gradual change type capacitive transducer; Comprise plastic assembly; Be located at the measurement controller in the said plastic assembly, the capacity earth electrode and the capacitance measurement electrode that are tightly connected with said plastic assembly, the electric capacity correcting module that links to each other with said capacitance measurement electrode with said capacity earth electrode; Said capacity earth electrode, said capacitance measurement electrode and said electric capacity correcting module three form the U-shaped measurement structure; Wherein, the outside sheathed heat-shrinkable T bush of said capacitance measurement electrode and said electric capacity correcting module, said capacity earth electrode is near the sheathed heat-shrinkable T bush of the part of said electric capacity correcting module; Said capacity earth electrode is provided with temperature-sensitive sticker, and said capacity earth electrode, said capacitance measurement electrode, said electric capacity correcting module and said temperature-sensitive sticker link to each other with said measurement controller through lead respectively.
Particularly; Said electric capacity correcting module comprises sensing element; And first insulating part and second insulating part that are connected to said sensing element two ends; Said first insulating part links to each other with said capacity earth electrode, and said second insulating part links to each other with the metal connecting piece of filling in said sensing element through bolt, and said second insulating part also links to each other with said capacitance measurement electrode.
Particularly, said first insulating part and said second insulating part all adopt teflon to process.
Particularly, the said sensing element in the said electric capacity correcting module, said capacity earth electrode and said capacitance measurement electrode all adopt stainless-steel tube to process.
Particularly, said temperature-sensitive sticker is the LM35 temperature-sensitive sticker.
Particularly, said heat-shrinkable T bush is a pyrocondensation Teflon sleeve pipe.
Particularly, said plastic assembly adopts nylon to process.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is: compare prior art; 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 said gradual change type capacitive transducer of the embodiment of the invention;
Fig. 2 is the structural representation of the said 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 object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that embodiment of the present invention is done to describe in detail further below.
As shown in Figure 1; The said 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, said sensor comprises plastic assembly 6, is located at the measurement controller 7 in the said plastic assembly 6; The capacity earth electrode 3 and the capacitance measurement electrode 4 that are tightly connected with said plastic assembly 6; With the electric capacity correcting module 1 that said capacity earth electrode 3 links to each other with said capacitance measurement electrode 4, said capacity earth electrode 3, said capacitance measurement electrode 4 and said electric capacity correcting module 1 three form the U-shaped measurement structure, wherein; Said capacitance measurement electrode 4 and said electric capacity correcting module 1 outside sheathed heat-shrinkable T bush 2; Said capacity earth electrode 3 is arranged with heat-shrinkable T bush 2 near the part of said electric capacity correcting module 1, and said capacity earth electrode 3 is provided with temperature-sensitive sticker 5, and said capacity earth electrode 3, said capacitance measurement electrode 4, said electric capacity correcting module 1 and said temperature-sensitive sticker 5 link to each other with said measurement controller 7 through lead respectively.
Wherein, the U-shaped structure not only has from fixing and assembling and supports and the effect of stably measured structure, also guaranteed capacitance measurement electrode and capacity earth electrode isometric, equidistance 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, and electric capacity also can be linear change along with the rising of water level, measures controller 7 calculates water level through the measure analog electric capacity digital signal; And the PWM modulation of passing through controller is exported signal and is transported to the demonstration of Long-distance Control instrument with the temperature amount from signal wire 8 outputs.
In this example,, between said capacity earth electrode 3 and the plastic assembly 6, between said capacitance measurement electrode 4 and the plastic assembly 6, preferably combine and realized that jointly waterproof is with fixing through sealing-plug and plastic assembly 6 referring to Fig. 1.The preferred silica gel of said sealing-plug has better guaranteed sealing property and ageing resistance.
As shown in Figure 2; Also can be referring to Fig. 3, particularly, said 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 said sensing element 1.1 two ends; Said first insulating part 1.6 links to each other with said capacity earth electrode 3, and said second insulating part 1.3 links to each other with the metal connecting piece of filling in said sensing element 1.1 1.2 through bolt 1.4, and said second insulating part 1.3 also links to each other with said 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 through second insulating part 1.3 through first insulating part 1.6.
Particularly, as shown in Figure 3, in this example, said first insulating part 1.6 and second insulating part 1.3 all preferentially adopt teflon to process.During practical implementation, said insulation course can adopt any insulating resin.
Particularly, as shown in Figure 2, in this example, preferably said electric capacity correcting module 1 (can referring to Fig. 1) is arranged on the top of said capacitance measurement electrode 4 and said 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 said sensing element 1.1 in the said electric capacity correcting module 1 (can referring to Fig. 1) (can referring to Fig. 2), said capacity earth electrode 3 and said capacitance measurement electrode 4 all preferentially adopt stainless-steel tube to process.
Particularly, as shown in Figure 1, in this example, said 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, said 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 said plastic assembly 6 preferential nylon that adopt are processed.
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 and ground-electrode adopt two stainless-steel tubes that parallel, and 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 that present water-level and water-temperature sensor for solar water heater is prone to fouling, life-span weak point, job insecurity.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. gradual change type capacitive transducer; It is characterized in that; Comprise plastic assembly, be located at the measurement controller in the said plastic assembly, the capacity earth electrode and the capacitance measurement electrode that are tightly connected with said plastic assembly; The electric capacity correcting module that links to each other with said capacitance measurement electrode with said capacity earth electrode; Said capacity earth electrode, said capacitance measurement electrode and said electric capacity correcting module three form the U-shaped measurement structure, wherein, and the outside sheathed heat-shrinkable T bush of said capacitance measurement electrode and said electric capacity correcting module; Said capacity earth electrode is near the sheathed heat-shrinkable T bush of the part of said electric capacity correcting module; Be provided with temperature-sensitive sticker in the said capacity earth electrode, said capacity earth electrode, said capacitance measurement electrode, said electric capacity correcting module and said temperature-sensitive sticker link to each other with said measurement controller through lead respectively
Said electric capacity correcting module comprises sensing element; And first insulating part and second insulating part that are connected to said sensing element two ends; Said first insulating part links to each other with said capacity earth electrode; Said second insulating part links to each other with the metal connecting piece of filling in said sensing element through bolt, and said second insulating part also links to each other with said capacitance measurement electrode.
2. gradual change type capacitive transducer as claimed in claim 1 is characterized in that, said first insulating part and said second insulating part all adopt teflon to process.
3. gradual change type capacitive transducer as claimed in claim 1 is characterized in that, the said sensing element in the said electric capacity correcting module, said capacity earth electrode and said capacitance measurement electrode all adopt stainless-steel tube to process.
4. gradual change type capacitive transducer as claimed in claim 1 is characterized in that, said temperature-sensitive sticker is the LM35 temperature-sensitive sticker.
5. gradual change type capacitive transducer as claimed in claim 1 is characterized in that, said heat-shrinkable T bush is a pyrocondensation Teflon sleeve pipe.
6. like the described gradual change type capacitive transducer of each claim of claim 1-5, it is characterized in that said plastic assembly adopts nylon to process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106089449A CN102116663B (en) | 2010-12-20 | 2010-12-20 | Gradient type capacitance sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106089449A CN102116663B (en) | 2010-12-20 | 2010-12-20 | Gradient type capacitance sensor |
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| Publication Number | Publication Date |
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| CN102116663A CN102116663A (en) | 2011-07-06 |
| CN102116663B true CN102116663B (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010106089449A Expired - Fee Related CN102116663B (en) | 2010-12-20 | 2010-12-20 | Gradient type capacitance sensor |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2699239Y (en) * | 2004-04-29 | 2005-05-11 | 江苏光芒厨卫太阳能科技有限公司 | Condenser type water temperature and water level sensing transmitter |
| EP1677084A1 (en) * | 2004-12-22 | 2006-07-05 | Roxer Industries S.A. | LIquid level sensor and method of estimation |
| 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 |
| DE102008001100A1 (en) * | 2008-04-10 | 2009-10-15 | Robert Bosch Gmbh | Capacitive probe and method of making a capacitive probe |
| CN101672681B (en) * | 2008-09-10 | 2012-09-05 | 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 |
| 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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