CN104568053B - A kind of self-heating difference thermal resistance liquid level sensor and its method for measuring liquid level - Google Patents
A kind of self-heating difference thermal resistance liquid level sensor and its method for measuring liquid level Download PDFInfo
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- CN104568053B CN104568053B CN201410764422.6A CN201410764422A CN104568053B CN 104568053 B CN104568053 B CN 104568053B CN 201410764422 A CN201410764422 A CN 201410764422A CN 104568053 B CN104568053 B CN 104568053B
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Abstract
The invention belongs to sensor technologies and thermal parameter fields of measurement, and in particular to a kind of self-heating difference thermal resistance liquid level sensor and its method for measuring liquid level.This method will be placed in tested liquid level position as the two of sensing element same sections with the armoured thermal resistance of the quality such as structure, the wherein hot water radiation wire electrified regulation of a sensing element, it uses it to as measuring cell, the hot water radiation wire no power of another sensing element, uses it to as compensating element,；With the variation of liquid level, the resistance difference of hot water radiation wire in two sensing elements is measured by resistance value measuring circuit, and liquid level is calculated according to the relationship between the obtained liquid level of test and resistance difference.Liquid level sensor structure provided by the present invention is simple, reliable performance, high sensitivity, strong antijamming capability.
Description
Technical field
The invention belongs to sensor technologies and thermal parameter fields of measurement, and in particular to a kind of self-heating difference thermoelectricity blocking solution
Level sensor and its method for measuring liquid level.
Background technique
Currently, the level gauging of many fluid reservoir/containers of industry or liquid storage tank, mostly uses greatly differential pressure type level gauge, floats
Sub- liquidometer, magnetic fluid level gauge, ultrasonic level gage, radar level gauge etc..These liquidometers, some are needed in fluid reservoir/appearance
Aperture on device or liquid storage tank, brings risk of leakage；Some are by Media density influence of fluctuations；Some reliabilities are not high；Some make
It is shorter with the service life；Some are not suitable for using in harsh environments such as high temperature, high pressure, high radioactivities.Therefore, there is an urgent need to one kind to be not necessarily to
In fluid reservoir/container or liquid storage tank aperture, high reliability, long life, and it is suitble to the level gauging used in harsh environment
Instrument.
Summary of the invention
Simple, reliable performance, high sensitivity, strong antijamming capability self-heating that the purpose of the present invention is to provide a kind of structures
Formula difference thermal resistance liquid level sensor and its method for measuring liquid level.
Technical scheme is as follows：A kind of self-heating difference thermal resistance liquid level sensor, including as sensing element
Two armoured thermal resistances with quality such as structures, between the armor sleeve and hot water radiation wire of the armoured thermal resistance be equipped with insulation
The hot water radiation wire of material, two sensing elements is connect with resistance value measuring circuit；Wherein the hot water radiation wire of a sensing element is powered
Heating, the hot water radiation wire no power of another sensing element.
Further, self-heating difference thermal resistance liquid level sensor as described above, wherein two armoured thermal resistances
Between be insulated and connect by heat insulated supporter, and it is separated by a distance.
Further, self-heating difference thermal resistance liquid level sensor as described above, wherein the hot water radiation wire uses nickel
Silk；The armor sleeve uses 316L stainless steel material；The insulating materials uses MgO.
A method of liquid level being measured using above-mentioned self-heating difference thermal resistance liquid level sensor, this method will be as sensitivity
The same section of two armoured thermal resistances with quality such as structures of element is placed in tested liquid level position, wherein a sensing element
Hot water radiation wire electrified regulation, use it to as measuring cell, the hot water radiation wire no power of another sensing element uses it to make
For compensating element,；With the variation of liquid level, the resistance difference of hot water radiation wire in two sensing elements is measured by resistance value measuring circuit
Liquid level is calculated according to the relationship between the obtained liquid level of test and resistance difference in value.
Further, the method for self-heating difference thermal resistance liquid level sensor measurement liquid level as described above, wherein described
Relationship between liquid level and resistance difference is H=A+B Δ R or H=A+B Δ R+C Δ R2,
H is liquid level, and Δ R is resistance difference, and A, B, C are the determining constant of test.
Further, the method for self-heating difference thermal resistance liquid level sensor measurement liquid level as described above, wherein described
Resistance difference is obtained by will measure after hot water radiation wire progress difference connection in two sensing elements, alternatively, independent measurement two
Subtract each other to obtain after hot water radiation wire resistance value in sensing element.
Beneficial effects of the present invention are as follows：The present invention is using bright in terms of gas (vapour) body and liquid (such as water) heat transfer property
Significant difference is different, the temperature difference very little between that section in two sensing elements in a liquid, i.e. electricity between two sensing elements
Difference very little is hindered, the temperature difference of this section among gas (vapour) body is big, i.e., resistance difference is also big.As liquid level increases, two
Total resistance difference between sensing element becomes smaller, i.e., liquid level is higher, and total resistance difference is smaller between two sensing elements.It borrows
Help the rule, exports the relational expression between liquid level H and thermal resistance value difference DELTA R, thus just liquid level continuously can be measured by Δ R
Just.The configuration of the present invention is simple, reliable performance, high sensitivity, strong antijamming capability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of self-heating difference thermal resistance liquid level sensor.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
Liquid level sensor provided by the present invention makees sensing element using two armoured thermal resistances with quality such as structures,
In hot water radiation wire itself electrified regulation in a sensing element, use it to induction level, be called measuring cell.Another Zhi Butong
Electric heating uses it to measurement environment temperature, compensates the influence of environment temperature, be called compensating element,.The thermoelectricity of two sensing elements
Resistance subtracts each other to form resistance difference using resistance value after difference connection or independent output.Specific resistance value measurement method is the public affairs of this field
Know technology, details are not described herein again.The liquid level sensor is using obvious in terms of gas (vapour) body and liquid (such as water) heat transfer property
Difference, the temperature difference very little between that section in two sensing elements in a liquid, i.e. resistance between two sensing elements
The temperature difference of difference very little, this section among gas (vapour) body is big, i.e., resistance difference is also big.As liquid level increases, two quick
Total resistance difference between sensing unit becomes smaller, i.e., liquid level is higher, and total resistance difference is smaller between two sensing elements.By
In the rule, pass through relational expression H=A+B the Δ R or H=A+B between test export liquid level H and thermal resistance value difference DELTA R
Δ R+C Δ R2, constant A, B and C are usually determined by experiment in formula, the liquid level that can be obtained according to experiment using which kind of relational expression
It is determined with the linear relationship of resistance difference.Thus the height of liquid level just can be continuously measured by Δ R.
As shown in Figure 1, a kind of self-heating difference thermal resistance liquid level sensor provided by the invention, by two with matter such as structures
The armoured thermal resistance 1,2 of amount is constituted as sensing element, is equipped between the armor sleeve 5 and hot water radiation wire 3 of armoured thermal resistance exhausted
Edge material 4, by the mutually insulation connection of heat insulated supporter 6 between two armoured thermal resistances 1,2, and it is separated by a distance, guarantee that
It will not interact between this, two hot water radiation wires are connect with resistance value measuring circuit.It will be as the two of sensing element same structures
Etc. the same section of the armoured thermal resistance of quality be placed in tested liquid level position, wherein the hot water radiation wire itself in a sensing element
Electrified regulation makes it higher than the certain temperature of periphery gas (vapour) body medium, typically about 10~30 DEG C, uses it to induction level；
Another Zhi Butong electric heating uses it to measurement environment temperature.After the connection of thermal resistance difference or independent output of two sensing elements
Resistance value subtracts each other to obtain resistance difference, and obtains the relationship of liquid level and resistance difference by experiment, to continuously measure liquid level
Just.
A specific example of the invention is that the outer diameter of armor sleeve 5 is 4.5mm, internal diameter 4.0mm, material 316L
Stainless steel；Hot water radiation wire 3 uses nickel wire, and nickel purity is 99.2%；Insulating materials 4 uses MgO, and purity 99.4%, sensor is total
Length is 1000mm.Original reason test proves, works well.In addition, hot water radiation wire 3 can also be replaced using raw material such as platinum or copper
Generation.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.If in this way, belonging to the model of the claims in the present invention and its equivalent technology to these modifications and changes of the present invention
Within enclosing, then the present invention is also intended to include these modifications and variations.
Claims (2)
1. a kind of method of self-heating difference thermal resistance liquid level sensor measurement liquid level, it is characterised in that：The self-heating difference
Thermal resistance liquid level sensor includes two armoured thermal resistances (1,2) with quality such as structures as sensing element, the armouring
Insulating materials (4) are equipped between the armor sleeve (5) and hot water radiation wire (3) of thermal resistance, the hot water radiation wire (3) of two sensing elements
It is connect with resistance value measuring circuit；This method is by the identical portions as the two of sensing element armoured thermal resistances with quality such as structures
Be placed in tested liquid level position, wherein the hot water radiation wire electrified regulation of a sensing element, uses it to as measuring cell, it is another
The hot water radiation wire no power of branch sensing element, uses it to as compensating element,；With the variation of liquid level, pass through resistance value measuring circuit
The resistance difference for measuring hot water radiation wire in two sensing elements, according to the pass between the obtained liquid level of test and resistance difference
Liquid level is calculated in system, and the relationship between the liquid level and resistance difference is
H=A+B Δ R or H=A+B Δ R+C Δ R2,
H is liquid level, and Δ R is resistance difference, and A, B, C are the determining constant of test.
2. the method for self-heating difference thermal resistance liquid level sensor measurement liquid level as described in claim 1, it is characterised in that：Institute
The resistance difference stated is obtained by will measure after hot water radiation wire progress difference connection in two sensing elements, alternatively, independent measurement
Subtract each other to obtain after hot water radiation wire resistance value in two sensing elements.
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| CN201410764422.6A CN104568053B (en) | 2014-12-11 | 2014-12-11 | A kind of self-heating difference thermal resistance liquid level sensor and its method for measuring liquid level |
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| CN104568053B true CN104568053B (en) | 2018-11-20 |
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| CN106370268B (en) * | 2016-12-07 | 2023-12-26 | 河北君行科技有限公司 | Temperature sensing type liquid level switch utilizing self-heating effect of thermal resistor |
| EP3658867B1 (en) | 2017-07-27 | 2022-07-06 | Watlow Electric Manufacturing Company | Sensor system and integrated heater-sensor for measuring and controlling performance of a heater system |
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