CN102109371A - Sensor for measuring water level by using temperature sensor and use method thereof - Google Patents
Sensor for measuring water level by using temperature sensor and use method thereof Download PDFInfo
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- CN102109371A CN102109371A CN2011100413975A CN201110041397A CN102109371A CN 102109371 A CN102109371 A CN 102109371A CN 2011100413975 A CN2011100413975 A CN 2011100413975A CN 201110041397 A CN201110041397 A CN 201110041397A CN 102109371 A CN102109371 A CN 102109371A
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Abstract
The invention relates to a water level sensor for measuring water level by using a temperature sensor, which comprises a constant flow source, a plurality of temperature-measuring modules and a sealing waterproof shell; the temperature-measuring module comprises a resistor temperature sensor and a resistor; the constant flow source is connected with the resistors in the temperature-measuring modules in series to form a closed loop; the measuring circuit is electrically connected with the resistor temperature sensor in the temperature-measuring modules for measuring the temperature of each resistor temperature sensor in the closed loop; and the resistor temperature sensor and temperature-measuring module are arranged in the sealing waterproof shell.
Description
Technical field
The present invention relates to a kind of sensor and using method thereof of serviceability temperature sensor measurement water level, particularly a kind of sensor and using method thereof that is used for the serviceability temperature sensor measurement water level of solar water heater.
Background technology
At present, the level sensor that is used for solar water heater adopts electric pole type mostly, and this sensor construction is simple, and cost is lower, and measurement result accurately and reliably.But the sensor needs relatively drier working environment, because sensor is immersed in the water for a long time, after water infiltrated sensor internal, it was with regard to complete failure.For addressing the above problem, the mission life that the method for sealing prolongs sensor is generally taked to improve in this area, but since in the water heater difference variation of water bigger, general seal approach can't the long period plays due effect.Therefore, electrode sensor must just be changed every a period of time, caused great man power and material's waste.
In the art, the use of temperature sensor is very general.Its volume is little, and is in light weight, the particularly important is it and can not contact the water conservancy project work, so the waterproof encapsulation is relatively easy.If can replace the electrode measurement water level by the serviceability temperature sensor, can prolong the serviceable life of level sensor greatly.And, owing to generally all need temperature sensor in the solar water heater, therefore, serviceability temperature sensor measurement water level can dual-use material, reduces the volume of sensor, and a kind of general standard component of temperature sensor, price is compared relatively low with electrode, can significantly reduce the cost of sensor.
Summary of the invention
For addressing the above problem, the present invention proposes a kind of level sensor of serviceability temperature sensor measurement water level, and its technical scheme is as follows:
A kind of level sensor of serviceability temperature sensor measurement water level is characterized in that, comprising: constant current source, a plurality of temperature measurement module, water-tight shell and metering circuit; Described temperature measurement module comprises temperature sensor and resistance, and the resistance in constant current source and the described a plurality of temperature measurement module is composed in series the closed-loop path; Metering circuit is electrically connected the temperature sensor in described a plurality of temperature measurement module, to be used for measuring the temperature of each temperature sensor of described closed-loop path; Described constant current source and temperature measurement module all are arranged in the water-tight shell.
Wherein can also comprise control system, described control system is controlled the on/off of described closed-loop path.
Wherein said metering circuit only comprises lead, and lead connects each temperature sensor and have the terminals of drawing from the water-tight shell.
Wherein said metering circuit comprises lead and measuring unit, and lead connects each resistance temperature sensor and measuring unit, obtains the electric signal of the temperature of corresponding each temperature sensor by measuring unit.
Wherein said temperature sensor and described resistance fit tightly.
Wherein the part of water-tight housing contacts temperature sensor adopts heat-transfer matcrial, has the thermal insulation parts on the water-tight shell between per two adjacent temperature sensors.
Use the principle of said temperature sensor measurement water level to be: when resistance passed to electric current, it can heat up owing to electricresistance effect.Performance is also different because the radiating effect difference of water and air, resistance temperature sensor wherein heat up.Because air is the poor conductor of heat, in air, resistance is energising in a single day, and its temperature almost can rise by straight line, if electric current is bigger, the rising meeting of temperature is quite obvious; And because water is the good conductor of heat, resistance is switched in water, and what its heat can be very fast is delivered in the water, thereby causes its temperature also not have too fast variation (if container is bigger even constant substantially).Put into water on the constant current source if a plurality of identical resistance string are linked to, because what adopt is constant current source, the heat that each resistance produces is identical substantially, but the temperature rise of the resistance in water will be far smaller than the temperature rise of resistance in the air, promptly in the water temperature of resistance less than the temperature of resistance in the air.At each resistance annex laying temperature sensor, the temperature variation of each resistance of serviceability temperature sensor measurement, whether it is in water by measure of the change, measures water level with this.
The measuring method of above-mentioned level sensor is as follows:
1. will install vertical substantially being positioned over needs to measure in the water level container;
Constant current source is switched on to the closed-loop path;
3. use measuring unit to measure the temperature of each temperature sensor successively, and will be designated as first temperature value of electrical signals that should temperature;
4. through after one default period, use metering circuit to measure the temperature of each temperature sensor once more successively, and will be designated as second temperature value of electrical signals that should temperature;
5. external comparator circuit compares first temperature and second temperature of each sensor, and first temperature of each sensor and the difference of second temperature are recorded as the 3rd temperature;
6. external comparator circuit compares the 3rd temperature and the threshold values of presetting, each the 3rd temperature is to there being a default threshold values, as the threshold values of the 3rd temperature less than its corresponding preset, then the temperature sensor under the 3rd temperature is in water, as the threshold values of the 3rd temperature greater than its corresponding preset, then the temperature sensor under the 3rd temperature is arranged in air;
7. determine water level according to the result of step in 6..
In said method, the described default time is 5-120 second, the threshold values of each the 3rd temperature corresponding preset be separately first temperature 1%～3%.
Description of drawings
Accompanying drawing 1 is a preferred embodiment of the present invention;
Accompanying drawing 2 is another preferred embodiment of the present invention;
Accompanying drawing 3 is the structural drawing of temperature measurement module among the present invention.
Reference numeral is as follows:
The 1-temperature measurement module; The 2-constant current source; 3-water-tight shell; The 4-lead; The 5-terminals; 6-thermal insulation parts; The 7-temperature measuring unit; 8-resistance; The 9-temperature sensor.
Embodiment
Referring to accompanying drawing 1, it discloses a preferred embodiment according to the level sensor of serviceability temperature sensor measurement water level of the present invention.Comprise: constant current source, a plurality of temperature measurement module, water-tight shell; Described temperature measurement module comprises temperature sensor and resistance, and the resistance that constant current source connects in a plurality of temperature measurement modules successively is composed in series the closed-loop path, and each resistance is identical; Temperature sensor adopts resistance temperature sensor, metering circuit is lead and measuring unit, lead connects the two ends of temperature sensor in a plurality of temperature measurement modules, connect measuring unit simultaneously, be used to measure the voltage at each temperature sensor two ends, obtain the temperature of temperature sensor with this, measuring unit connects external comparator circuit (comparator circuit and not shown with being connected of measuring unit); Described constant current source and temperature measurement module all are arranged in the water-tight shell; In temperature measurement module, temperature sensor and resistance fit tightly, and make the temperature of the direct reaction resistance of temperature sensor measurements; The part of level sensor water-tight housing contacts temperature sensor adopts stainless steel to make, and helps the conduction of heat, has improved the accuracy of measuring, and certainly, in actual applications, also can use other heat-transfer matcrial, for example aluminium, copper etc.Under the situation of using heat-transfer matcrial, on the water-tight shell between per two adjacent temperature sensors the thermal insulation parts can be set, each temperature sensor has hot independence, avoids because the interference that shell heat conduction brings.
The measuring method of the above-mentioned level sensor of brief description:
1. will install vertical substantially being positioned over needs to measure in the water level container;
Constant current source is switched on to the closed-loop path;
3. use metering circuit to measure the magnitude of voltage at each temperature sensor two ends (temperature of its temperature of reaction sensor) successively, writing down above-mentioned magnitude of voltage is first magnitude of voltage (first temperature);
4. through after one default period, use metering circuit to measure the magnitude of voltage at each temperature sensor two ends once more successively, writing down above-mentioned magnitude of voltage is first magnitude of voltage (second temperature);
5. external comparator circuit compares first magnitude of voltage and second magnitude of voltage of each sensor, and first magnitude of voltage of each sensor and the difference of second magnitude of voltage are recorded as tertiary voltage value (the 3rd temperature);
6. external comparator circuit compares tertiary voltage value and the threshold values of presetting, each tertiary voltage value is to there being a default threshold values, as the threshold values of tertiary voltage value less than its corresponding preset, then the temperature sensor under this tertiary voltage value is in water, as the threshold values of tertiary voltage value greater than its corresponding preset, then the temperature sensor under this tertiary voltage value is arranged in air;
7. determine water level according to the result of step in 6..
Referring to accompanying drawing 2, it discloses the another kind of preferred embodiment according to the level sensor of serviceability temperature sensor measurement water level of the present invention.Comprise: constant current source, a plurality of temperature measurement module, water-tight shell; Described temperature measurement module comprises temperature sensor and resistance, and the resistance in constant current source and a plurality of temperature measurement module is composed in series the closed-loop path, and each resistance is identical; Metering circuit is a lead, is electrically connected the temperature sensor in described a plurality of temperature measurement module, to be used for measuring the temperature of each temperature sensor of described closed-loop path; Lead has terminals, and it is drawn from the water-tight shell, is used to connect outside measuring unit and comparator circuit, and described constant current source and temperature measurement module all are arranged in the water-tight shell; Described temperature sensor and described resistance fit tightly, and make the measurement result of temperature sensor more accurate.The part of water-tight housing contacts resistance adopts heat-transfer matcrial, heat interaction is smooth and easy between assurance resistance and the surrounding environment, have the thermal insulation parts on the water-tight shell between per two adjacent resistors, prevent that heat conduction in the water-tight shell is to the influence of temperature measurement result.
Heat conduction in the envelope waterproof case is to the influence of temperature measurement result.
The measuring method of the above-mentioned level sensor of brief description:
1. will install vertical substantially being positioned over needs to measure in the water level container;
Constant current source is switched on to the closed-loop path;
3. use external or built-in measuring unit to measure the temperature of each temperature sensor successively, and will be designated as first temperature value of electrical signals that should temperature;
4. through after one default period, use measuring unit to measure the temperature of each temperature sensor once more successively, and will be designated as second temperature value of electrical signals that should temperature;
5. external or built-in comparator circuit compares first temperature and second temperature of each sensor, and first temperature of each sensor and the difference of second temperature are recorded as the 3rd temperature;
6. external comparator circuit compares the 3rd temperature and the threshold values of presetting, each the 3rd temperature is to there being a default threshold values, as the threshold values of the 3rd temperature less than its corresponding preset, then the temperature sensor under the 3rd temperature is in water, as the threshold values of the 3rd temperature greater than its corresponding preset, then the temperature sensor under the 3rd temperature is arranged in air;
7. determine water level according to the result of step in 6..
In above-mentioned using method, the wherein said default time can be determined according to the current value of constant current source and the type of temperature sensor, be preferably 5-120 second, though the temperature of temperature sensor is constant substantially in water, promptly the voltage at its two ends is constant substantially, for the consideration of avoiding measuring error, threshold values should be set, the experiment proved that the threshold values of each the 3rd temperature corresponding preset can be 1%～3% of first temperature separately, above-mentioned value can obtain extraordinary actual effect.
Can use the temperature sensor of any type in the level sensor, as long as reacting environment temperature, it changes, different temperature sensors can be with different signal reaction temperature, its measurement may need different circuit to carry out, that is to say, to different temperature sensors, measuring unit may be different, and it also may be different connecting corresponding to the metering circuit of measuring unit.In any case the measuring unit structure of temperature sensor and metering circuit annexation all are common practise, those skilled in the art can select for use according to actual needs, and are irrelevant because of itself and the present invention, will not tire out at this and to state.
In accompanying drawing 1 and accompanying drawing 2 described embodiment, measuring unit is provided with respectively and is not arranged in the level sensor, and these set-up modes all allow.In addition, comparator circuit can be arranged in the level sensor too, its concrete set-up mode can use according to concrete applicable cases.
Be understandable that the line of connect the line of each temperature measurement module in the accompanying drawing, drawing from measuring unit etc. should be the bundle conductor that many lines are formed, the single line among the figure only is a kind of signal, has only represented annexation wherein, rather than to the qualification of quantity.The connection of the reality of concrete quantity basis is determined.
Above-described external comparator circuit comprises storage data, comparing function, adopt common comparator circuit to get final product (as Single Chip Microcomputer (SCM) system, computer software etc.), its method for designing is the common practise of this area, and is irrelevant because of itself and technology contents of the present invention, will not tire out at this and to state.
The above; only be the preferable embodiment of patent of the present invention; but the protection domain of patent of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that patent of the present invention discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of patent of the present invention.
Claims (9)
1. the level sensor of a serviceability temperature sensor measurement water level is characterized in that, comprising: constant current source, a plurality of temperature measurement module, water-tight shell and metering circuit; Described temperature measurement module comprises temperature sensor and resistance, and the resistance in constant current source and the described a plurality of temperature measurement module is composed in series the closed-loop path; Metering circuit is electrically connected the temperature sensor in described a plurality of temperature measurement module, to be used for measuring the temperature of each temperature sensor of described closed-loop path; Described constant current source and temperature measurement module all are arranged in the water-tight shell.
2. level sensor as claimed in claim 1 wherein also comprises control system, and described control system is controlled the on/off of described closed-loop path.
3. level sensor as claimed in claim 1, wherein said metering circuit only comprises lead, lead connects each temperature sensor and have the terminals of drawing from the water-tight shell.
4. level sensor as claimed in claim 1, wherein said metering circuit comprises lead and measuring unit, lead connects each temperature sensor and measuring unit, obtains the electric signal of the temperature of corresponding each temperature sensor by measuring unit.
5. level sensor as claimed in claim 1, wherein said temperature sensor and described resistance fit tightly.
6. as the arbitrary described level sensor of claim 1-5, wherein the part of water-tight housing contacts temperature sensor adopts heat-transfer matcrial, has the thermal insulation parts on the water-tight shell between per two adjacent temperature sensors.
7. the method for use such as the arbitrary described measurement device water level of claim 1-6 is characterized in that may further comprise the steps:
1. will install vertical substantially being positioned over needs to measure in the water level container;
Constant current source is switched on to the closed-loop path;
3. use measuring unit to measure the temperature of each temperature sensor successively, and will be designated as first temperature value of electrical signals that should temperature;
4. through after one default period, use metering circuit to measure the temperature of each temperature sensor once more successively, and will be designated as second temperature value of electrical signals that should temperature;
5. external comparator circuit compares first temperature and second temperature of each sensor, and first temperature of each sensor and the difference of second temperature are recorded as the 3rd temperature;
6. external comparator circuit compares the 3rd temperature and the threshold values of presetting, each the 3rd temperature is to there being a default threshold values, as the threshold values of the 3rd temperature less than its corresponding preset, then the temperature sensor under the 3rd temperature is in water, as the threshold values of the 3rd temperature greater than its corresponding preset, then the temperature sensor under the 3rd temperature is arranged in air;
7. determine water level according to the result of step in 6..
8. method as claimed in claim 7, the wherein said default time is 5-120 second.
9. one kind as claim 7 or 8 described methods, wherein the threshold values of each the 3rd temperature corresponding preset be separately first temperature 1%～3%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100413975A CN102109371A (en) | 2011-02-21 | 2011-02-21 | Sensor for measuring water level by using temperature sensor and use method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100413975A CN102109371A (en) | 2011-02-21 | 2011-02-21 | Sensor for measuring water level by using temperature sensor and use method thereof |
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| CN102109371A true CN102109371A (en) | 2011-06-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305654A (en) * | 2011-07-29 | 2012-01-04 | 山东桑乐太阳能有限公司 | Sensor capable of measuring water level by using temperature sensors and using method thereof |
| CN102331284A (en) * | 2011-07-29 | 2012-01-25 | 山东桑乐太阳能有限公司 | Method and device for measuring water level with temperature sensors |
| CN102507026A (en) * | 2011-11-09 | 2012-06-20 | 江苏弘润光电科技控股集团有限公司 | Method and device for measuring average temperature of multiple points |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2864503Y (en) * | 2005-12-09 | 2007-01-31 | 欧阳春光 | Solar energy water heater and water tank level detector |
| CN101556179A (en) * | 2009-03-12 | 2009-10-14 | 瞿瑛 | Self-heating heat responsive element and liquid level detector assembled thereby |
-
2011
- 2011-02-21 CN CN2011100413975A patent/CN102109371A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2864503Y (en) * | 2005-12-09 | 2007-01-31 | 欧阳春光 | Solar energy water heater and water tank level detector |
| CN101556179A (en) * | 2009-03-12 | 2009-10-14 | 瞿瑛 | Self-heating heat responsive element and liquid level detector assembled thereby |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102305654A (en) * | 2011-07-29 | 2012-01-04 | 山东桑乐太阳能有限公司 | Sensor capable of measuring water level by using temperature sensors and using method thereof |
| CN102331284A (en) * | 2011-07-29 | 2012-01-25 | 山东桑乐太阳能有限公司 | Method and device for measuring water level with temperature sensors |
| CN102507026A (en) * | 2011-11-09 | 2012-06-20 | 江苏弘润光电科技控股集团有限公司 | Method and device for measuring average temperature of multiple points |
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Application publication date: 20110629 |