CN204924372U - Level sensor based on temperature sensor - Google Patents
Level sensor based on temperature sensor Download PDFInfo
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- CN204924372U CN204924372U CN201520639036.4U CN201520639036U CN204924372U CN 204924372 U CN204924372 U CN 204924372U CN 201520639036 U CN201520639036 U CN 201520639036U CN 204924372 U CN204924372 U CN 204924372U
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Abstract
Level sensor based on temperature sensor is including the waterproof seal shell, still include constant current source, a plurality of temperature sensor, measuring circuit, characterized by: every temperature sensor and a resistance are closely laminated and are constituted the temperature measurement module, and the resistance homogeneous phase of every temperature sensor laminating together, series resistance constitutes closed -loop with the constant current source series connection, the measuring circuit electricity is connected temperature sensor for obtain each temperature sensor's the corresponding signal of telecommunication of temperature, constant current source and temperature measurement module all set up in the waterproof seal shell. This kind of level sensor is difficult to damage, long service life, with low costs.
Description
Technical field
The utility model relates to level sensor technical field, specifically a kind of for the level sensor in solar water heater.
Background technology
At present, mostly adopt electric pole type for the level sensor in solar water heater, this sensor construction is simple, and cost is lower, and measurement result accurately and reliably.But the sensor needs drier working environment, because sensor is immersed in water for a long time, after water infiltrates sensor internal, it is with regard to complete failure.
For solving the problem, this area generally takes the method improving sealing to extend the mission life of sensor, but due to the difference variation of water in water heater comparatively large, general seal approach cannot the long period play due effect.Therefore, electrode sensor just must be changed every a period of time, causes great man power and material to waste.
Utility model content
In order to overcome the shortcoming that above-mentioned prior art exists, the purpose of this utility model is to provide a kind of level sensor based on temperature sensor, and this kind of level sensor is not easy damage, long service life, cost are low.
The level sensor based on temperature sensor that the utility model provides, comprises water-tight shell; Also comprise constant current source, multiple identical temperature sensor, metering circuit; It is characterized in that: each described temperature sensor and a resistance fit tightly formation temperature measurement module; Described resistant series closed-loop path in series with constant current source; Described metering circuit is electrically connected described temperature sensor, the electric signal that the temperature for obtaining each temperature sensor is corresponding; Described constant current source and temperature measurement module are all arranged in water-tight shell.
As the further technical scheme of the utility model: described water-tight shell comprises multistage heat conduction shell and multiple thermal insulation parts; Described heat conduction shell is made up of heat-transfer matcrial, and each described temperature sensor contacts with one section of described heat conduction shell; Described thermal insulation parts are made up of heat-barrier material; By the heat insulation connection of at least one thermal insulation parts between two sections of adjacent heat conduction shells.
Further: the spacing between two resistance of arbitrary neighborhood is equal.
Further: described closed circuit leads to the link for outer connected control system downwards.
Further: described metering circuit is positioned at water-tight shell, be connected with each temperature sensor lead.
Further: described metering circuit is arranged on outside water-tight shell, each temperature sensor is drawn wire and is formed the terminals be connected with metering circuit in the bottom of water-tight shell outside water-tight shell.
The beneficial effects of the utility model are: the use of temperature sensor is very general.Its volume is little, lightweight, and the particularly important is it and can not contact water conservancy project work, therefore waterproof enclosure ratio is easier to.Serviceability temperature sensor replaces electrode measurement water level, greatly can extend the serviceable life of level sensor.And, owing to generally all needing temperature sensor in 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 relatively low compared with electrode, significantly can reduce the cost of sensor.The level sensor that the utility model is made by temperature sensor, is not easy damage, long service life, cost is low.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described further:
Fig. 1 is the structural representation of the utility model embodiment one;
Fig. 2 is the structural representation of the utility model embodiment two;
Fig. 3 is the structural representation of temperature measurement module in the utility model;
In figure: 1 temperature measurement module; 2 constant current sources; 3 water-tight shells; 4 wires; 5 terminals; 6 thermal insulation parts; 7 metering circuits; 8 resistance; 9 temperature sensors.
Embodiment
Embodiment one: as shown in Figure 1, based on the level sensor of temperature sensor, should comprise water-tight shell 3, constant current source 2, multiple temperature measurement module 1, also comprises metering circuit 7.
Described constant current source 2 and temperature measurement module 1 are all arranged in water-tight shell 3.
Temperature measurement module is fitted tightly by a temperature sensor 9 and a resistance 8 and forms, and make the temperature of the direct reaction resistance 8 of temperature sensor 9 measurement result, as shown in Figure 3, the resistance 8 of each temperature measurement module is connected and closed-loop path in series with constant current source 2.Described closed circuit leads to the link for outer connected control system.The resistance of resistance can be selected according to thermal value demand, and general heating amount is large, is conducive to improving accuracy of detection.
In this embodiment, metering circuit 7 is positioned at water-tight shell 3, is connected, the electric signal that the temperature for obtaining each temperature sensor 9 is corresponding with temperature sensor 9 wire in each temperature measurement module.
Water-tight shell 3 comprises multistage heat conduction shell and multiple thermal insulation parts 6.Heat conduction shell is made up of heat-transfer matcrial, such as, adopt stainless steel to make, be conducive to the conduction of heat, improve the accuracy of measurement, certainly, in actual applications, also can use other heat-transfer matcrial, such as aluminium, copper etc.Each described temperature sensor 9 contacts with one section of described heat conduction shell.Thermal insulation parts 6 are made up of heat-barrier material; By the heat insulation connection of at least one thermal insulation parts 6 between two sections of adjacent heat conduction shells, each like this temperature sensor 9 has hot independence, avoids the interference because shell heat conduction brings.
The technology of the optimization taked in this embodiment, the spacing between two resistance 8 of arbitrary neighborhood is equal.
Embodiment two: as shown in Figure 2, the difference of this embodiment and embodiment one is, described metering circuit 7 is arranged on outside water-tight shell 3, and each temperature sensor 9 is drawn wire 4 and formed the terminals 5 be connected with metering circuit in the bottom of water-tight shell 3 outside water-tight shell 3.All the other technology, with embodiment one, repeat no more.
The principle using above-mentioned level sensor to measure water level is: when the resistance 8 in temperature measurement module 1 passes to electric current, due to electricresistance effect, it can heat up.Because the radiating effect of water and air is different, resistance wherein heats up and shows also difference.Due to the poor conductor that air is heat, in atmosphere, resistance is once energising, and its temperature almost can rise by straight line, if electric current is comparatively large, the rising of temperature can be quite obvious; And due to water be the good conductor of heat, resistance is energized in water, and what its heat can be very fast is delivered in water, thus causes its temperature also not have too fast change (if container is comparatively large even substantially constant).If put into water by multiple identical resistant series to constant current source, due to employing 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 air, namely in water, the temperature of resistance is less than the temperature of resistance in air.The temperature variation of each resistance measured by the temperature sensor 9 of each correspondence, and by measure of the change, whether it is in water, and measures water level with this.
The measuring method of above-mentioned level sensor is as follows:
1. substantially vertical for level sensor being positioned over need be measured in level vessels;
2. constant current source is made to be energized to closed-loop path;
3. metering circuit is used to measure the temperature of each temperature sensor successively, and by the value of electrical signals of temperature being designated as the first temperature;
4., after one default period, metering circuit is used again to measure the temperature of each temperature sensor successively, and by the value of electrical signals of temperature being designated as the second temperature;
5. utilize external comparator circuit the first temperature of each temperature sensor to be compared with the second temperature, the first temperature of each temperature sensor and the difference of the second temperature are recorded as the 3rd temperature;
3rd temperature compares with the threshold value preset by 6. external comparator circuit, each 3rd temperature is to there being a default threshold value, as the 3rd temperature is less than the threshold value preset of its correspondence, temperature sensor then belonging to the 3rd temperature is in water, as the 3rd temperature is greater than the threshold value preset of its correspondence, then the temperature sensor belonging to the 3rd temperature is arranged in air;
7. according to step 6. in result determination water level.
In the above-mentioned methods, the described default time is preferably 5-120 second, each 3rd temperature corresponding preset threshold value be 1% ~ 3% of respective first temperature.
The temperature sensor of any type can be used in level sensor, it changes as long as can react environment temperature, different temperature sensors can with different signal reaction temperature, its measurement may need different circuit to carry out, that is, to different temperature sensors, metering circuit may be different, and connected mode also may be different between the two.In any case temperature sensor and metering circuit and annexation are between the two all common practise, and those skilled in the art can select according to actual needs, because itself and this patent have nothing to do, will not tire out at this and state.
In the embodiment described in accompanying drawing 1 and accompanying drawing 2, metering circuit arranges respectively and is not arranged in level sensor, and these set-up modes are all allow.In addition, external comparator circuit can be arranged in level sensor too, its concrete set-up mode can use according to embody rule situation.
The line etc. of be understandable that, connect the line of each temperature measurement module in accompanying drawing, drawing from metering circuit should be the bundle conductor of many lines composition, and the single line in figure is only a kind of signal, only represents annexation wherein, instead of the restriction to quantity.Concrete quantity according to the connection of reality determine.
Above-described external comparator circuit comprises storage data, comparing function, common comparator circuit is adopted to get final product (as Single Chip Microcomputer (SCM) system, computer software etc.), its method for designing is the common practise of this area, because the technology contents of itself and this patent has nothing to do, will not tire out state at this.
The above; be only this patent preferably embodiment, but the protection domain of this patent is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that this patent discloses; the change that can expect easily or replacement, within the protection domain that all should be encompassed in this patent.
Claims (6)
1., based on the level sensor of temperature sensor, comprise water-tight shell; Also comprise constant current source, multiple temperature sensor, metering circuit; It is characterized in that: each described temperature sensor and a resistance fit tightly formation temperature measurement module, the resistance of each temperature sensor laminating is all identical; Described resistant series closed-loop path in series with constant current source; Described metering circuit is electrically connected described temperature sensor, the electric signal that the temperature for obtaining each temperature sensor is corresponding; Described constant current source and temperature measurement module are all arranged in water-tight shell.
2. the level sensor based on temperature sensor according to claim 1, is characterized in that: described water-tight shell comprises multistage heat conduction shell and multiple thermal insulation parts; Described heat conduction shell is made up of heat-transfer matcrial, and each described temperature sensor contacts with one section of described heat conduction shell; Described thermal insulation parts are made up of heat-barrier material; By the heat insulation connection of at least one thermal insulation parts between two sections of adjacent heat conduction shells.
3. the level sensor based on temperature sensor according to claim 1 and 2, is characterized in that: the spacing between two resistance of arbitrary neighborhood is equal.
4. the level sensor based on temperature sensor according to claim 3, is characterized in that: described closed circuit leads to the link for outer connected control system downwards.
5. the level sensor based on temperature sensor according to claim 1, is characterized in that: described metering circuit is positioned at water-tight shell, is connected with each temperature sensor lead.
6. the level sensor based on temperature sensor according to claim 1, it is characterized in that: described metering circuit is arranged on outside water-tight shell, each temperature sensor is drawn wire and is formed the terminals be connected with metering circuit in the bottom of water-tight shell outside water-tight shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520639036.4U CN204924372U (en) | 2015-08-21 | 2015-08-21 | Level sensor based on temperature sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520639036.4U CN204924372U (en) | 2015-08-21 | 2015-08-21 | Level sensor based on temperature sensor |
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| CN204924372U true CN204924372U (en) | 2015-12-30 |
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| CN201520639036.4U Active CN204924372U (en) | 2015-08-21 | 2015-08-21 | Level sensor based on temperature sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344465A (en) * | 2018-02-13 | 2018-07-31 | 广东吉米有品智能科技有限公司 | Method and device for measuring liquid level based on liquid temperature |
| CN109564126A (en) * | 2016-07-21 | 2019-04-02 | 惠普发展公司，有限责任合伙企业 | Liquid level sensing |
| CN112362131A (en) * | 2020-09-15 | 2021-02-12 | 重庆材料研究院有限公司 | Liquid level alarm sensor of high-temperature pressure container |
| CN112362130A (en) * | 2020-09-15 | 2021-02-12 | 重庆材料研究院有限公司 | Liquid level alarming method for high-temperature pressure container |
-
2015
- 2015-08-21 CN CN201520639036.4U patent/CN204924372U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109564126A (en) * | 2016-07-21 | 2019-04-02 | 惠普发展公司，有限责任合伙企业 | Liquid level sensing |
| US11009382B2 (en) | 2016-07-21 | 2021-05-18 | Hewlett-Packard Development Company, L.P. | Liquid level sensing |
| CN109564126B (en) * | 2016-07-21 | 2021-10-19 | 惠普发展公司，有限责任合伙企业 | Liquid level sensing |
| CN108344465A (en) * | 2018-02-13 | 2018-07-31 | 广东吉米有品智能科技有限公司 | Method and device for measuring liquid level based on liquid temperature |
| CN112362131A (en) * | 2020-09-15 | 2021-02-12 | 重庆材料研究院有限公司 | Liquid level alarm sensor of high-temperature pressure container |
| CN112362130A (en) * | 2020-09-15 | 2021-02-12 | 重庆材料研究院有限公司 | Liquid level alarming method for high-temperature pressure container |
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