CN108827422B - liquid metal liquid level continuous measuring device and liquid level measuring method thereof - Google Patents
liquid metal liquid level continuous measuring device and liquid level measuring method thereof Download PDFInfo
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- CN108827422B CN108827422B CN201810688043.1A CN201810688043A CN108827422B CN 108827422 B CN108827422 B CN 108827422B CN 201810688043 A CN201810688043 A CN 201810688043A CN 108827422 B CN108827422 B CN 108827422B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/24—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of resistance of resistors due to contact with conductor fluid
Abstract
The invention discloses a liquid metal liquid level continuous measuring device, comprising: the liquid metal container comprises a liquid metal container, a conductive outer sleeve, a sealing sleeve and a sealing sleeve, wherein one end of the conductive outer sleeve is a closed end, the other end of the conductive outer sleeve is an open end, and the neck of the conductive outer sleeve is arranged on the liquid metal container in an insulating mounting mode by adopting an insulating sealing clamping sleeve; the conductive wire is inserted into the conductive outer sleeve from the open end of the conductive outer sleeve, only one conductive connecting part C is formed between the conductive wire and the conductive outer sleeve, and the electricity measuring part comprises a direct-current power supply and a voltmeter, wherein the positive electrode of the direct-current power supply is connected with a point A on the open end of the conductive outer sleeve, and the negative electrode of the direct-current power supply is connected with a point B on the upper end of the conductive wire; the positive pole of the voltmeter is connected with a point D on the opening end part of the conductive outer sleeve, and the negative pole of the voltmeter is connected with a point B on the upper end part of the conductive wire.
Description
Technical Field
the invention belongs to the technical field of high-temperature liquid metal measuring equipment, and particularly relates to a device capable of continuously measuring the liquid level of liquid metal and a using method thereof
Background
Nuclear energy has occupied more and more important position in the world energy field at present, and along with the development of nuclear energy, how to fully utilize limited uranium resources and effectively treat nuclear waste has increasingly attracted attention of people. Liquid metal reactors are an effective outlet to solve the above problems. The level of the liquid metal and the change rule thereof are important parameters for the operation of the system. It is therefore necessary to develop a device that can measure the level of liquid metal continuously and effectively. There are many different techniques for level measurement.
For example, chinese patent 99202908.2 provides a float-type liquid level measuring instrument, which mainly comprises a float, a rope tying the float, a measuring wheel, a large coil spring wheel coaxially mounted with the measuring wheel, a signal conversion output device, and a coil spring with one end wound around the large coil spring wheel and the other end wound around the small coil spring wheel. However, the mechanical structure is more, the requirements for high temperature and high sealing cannot be met, and the problem of high corrosivity of liquid sodium cannot be solved. And therefore unsuitable for application in liquid metal systems.
For another example, chinese patent 2011102783125 provides a liquid metal level probe and a method for using the same, which includes a high level probe, a low level probe, a stainless steel sleeve, a corundum tube and necessary sealing and insulating components, and is a switch type liquid level detection device based on liquid metal conductivity. The device can be effectual detect the internal liquid level of liquid metal tank, and the result is easily observed, reasonable in design, compact structure is fit for assembling on liquid metal container. However, the probe can only detect two specific liquid levels, and cannot realize continuous measurement of the liquid metal level.
disclosure of Invention
the invention aims to provide a liquid metal liquid level continuous measuring device and a liquid level measuring method thereof, which can particularly solve the problem of liquid metal liquid level continuous measurement flowing under a high-temperature environment state.
The specific technical scheme of the invention is as follows:
A liquid metal liquid level continuous measuring device,
The method comprises the following steps:
The conductive outer sleeve is provided with a closed end part at one end and an open end part at the other end, the closed end part is used for being inserted into the liquid metal container and isolating liquid metal in the liquid metal container from entering the conductive outer sleeve, the open end part is arranged outside the liquid metal container, and the neck part of the conductive outer sleeve is arranged on the liquid metal container in an insulating installation mode by adopting an insulating sealing clamping sleeve;
The conductive wire, the conductive wire is inside from electrically conductive outer tube open end insert electrically conductive outer tube, the conductive wire has 1, forms only a electrically conductive connecting portion C between conductive wire and the electrically conductive outer tube, and this electrically conductive connecting portion C is: a conductive connecting part between the lower end part of the conductive wire and the closed end part of the conductive outer sleeve;
The electricity measuring part comprises a direct current power supply and a voltmeter, wherein the positive electrode of the direct current power supply is connected with a point A on the opening end part of the conductive outer sleeve, and the negative electrode of the direct current power supply is connected with a point B on the upper end part of the conductive wire; the positive pole of the voltmeter is connected with a point D on the opening end part of the conductive outer sleeve, and the negative pole of the voltmeter is connected with a point B on the upper end part of the conductive wire;
The position selection of the point A and the point D is carried out according to the requirement 1, and the requirement 1 is as follows: point a and point D are the same point or two points at the same height.
In the structure, the conductive outer sleeve and the conductive wire form a probe part, and the probe part and the electricity measuring part are cooperated to form a device capable of continuously measuring the liquid level of the liquid metal integrally, wherein the end part of the conductive outer sleeve inserted into the liquid metal is sealed to form a sealed end part, so that the high-temperature liquid metal can be prevented from entering the conductive outer sleeve, and the conductive wire of the core structure is completely positioned in the conductive outer sleeve, so that the conductive wire is not contacted with the high-temperature liquid metal, the conductive wire is prevented from being corroded, the service life and the measurement precision are improved, and the probe is particularly suitable for high-precision and long-time use under a high-temperature ring. The solution of continuous measurement is that, because the structure of the invention is that the conductive wire is directly connected to the bottom of the conductive outer sleeve, and the direct current power supply and the voltmeter are loaded according to the structure scheme, the structure is that the conductive outer sleeve is divided into the part above the liquid level and the part below the liquid level, the upper part of the liquid level is the interval from the liquid level to the point A and the point D, the lower part of the liquid level is the interval from the liquid level to the closed end, in this case, the part above the liquid level and the part below the liquid level of the conductive outer sleeve are (respectively) regarded as 2 resistances, and the resistances of the 2 parts are changed along with the change of the liquid level, but the sum of the total resistances is not changed, and meanwhile, because the liquid metal is conductive, the liquid metal and the liquid metal container are parallel connected at the junction position of the liquid metal and the conductive outer,Wherein the resistance of the part above the liquid level of the conductive outer sleeve is R1The resistance of the part below the liquid level of the conductive outer sleeve is R2the liquid metal and the liquid metal container have a resistance R3Meanwhile, the conductive wire can be regarded as 1 resistor RwUnder the structure, the equivalent circuit comprises a loop, wherein the loop is a power supply and an R connected in series1、R2、Rw，R1Connected to the positive pole of the power supply, Rw connected to the negative pole of the power supply, R2Is connected in parallel with R3The positive pole of the positive power supply of the voltmeter is connected with the positive pole, and the negative pole of the voltmeter is connected with R in serieswIn this circuit, we find:EinOutput voltage for DC power supply, EoutFor the reading of the voltmeter we find that the parameters that can be known in this formula are: rW、Ein，Eout，R3And R is1and R2is a parameter which dynamically changes along with the change of the liquid level and can not be directly obtained, and we find that R is the parameterWThe overall resistance of the material used is greater when the material used is less conductive, and because the conductive outer sleeve used in the present invention has a greater contact area with the liquid metal, the resistance of the liquid metal and its container portion is very low, where R has been found to be3Is much smaller than R1、R2、RWr can therefore be ignored3Therefore, in the above case, the above formula can be simplified as:
wherein EinFor the output voltage of the power supply 1, 24V, R is generally selectedWMeasured at the time of device manufacture. By looking at the reading of the voltmeter, the resistance R can be measured1The value of (c).
And R is1The length of the upper part of the conductive outer sleeve which is not submerged by the liquid metal is linearly related, and the final submerged area can be calculated according to the linear relationshipLength.
Thus, from the above analysis, it can be seen that the present invention is directed to continuous measurement, which relies mainly on the above-mentioned special structural design, not only to meet the high temperature problem, but also to design a specific circuit design in which R is calculated from the power supply value, the voltage meter actual measurement value, and the advance measurementWThereby obtaining R1According to the liquid level and R1the linear relationship of (a) gives the liquid level height. Therefore, the liquid level height at the moment can be conveniently calculated by actually and directly measuring the changed voltmeter value, the measurement is continuous, and any height can be measured.
Height of liquid level and R1the linear relationship is the section between the point a or D on the outer conductive sleeve and the liquid level, the structure is a uniform structure, and the linear relationship can be measured according to the used material and the conductive performance, generally S P/Q R1S is the length, i.e., the position of the liquid surface determines the size of S, P is the resistivity of the material, and Q is the cross section.
preferably, the conductive wire is inserted into the conductive outer sleeve from the open end of the conductive outer sleeve, and the two ends of the conductive wire are respectively a point B and a point C. The position selection of the points B and C is performed according to the requirement 2, requirement 2: only one conductive connecting part C is formed between the conductive wire and the conductive outer sleeve, and the conductive connecting part C is as follows: a conductive connecting part between the lower end part of the conductive wire and the closed end part of the conductive outer sleeve; and the upper end point B of the conductive wire is respectively connected with the cathode of the direct current power supply and the cathode of the voltmeter.
Preferably, the conductive outer sleeve is made of a conductive material which has high resistivity and small resistance change rate along with temperature, is high-temperature resistant and is corrosion-resistant, and the conductive wire is made of a conductive material which has high resistivity and small resistance change rate along with temperature and is high-temperature resistant.
The conductive outer sleeve is made of a conductive material with the resistivity of P1 and the resistance change rate with temperature of L1, and the conductive wire is made of a conductive material with the resistivity of P2 and the resistance change rate with temperature of L2; the higher resistivity means: wherein, the values of P1 and P2 are both the range of 80 times to 200 times of the resistivity of copper, and the resistance changes with the temperatureThe small chemical conversion rate means that: the value ranges of L1 and L2 are 2-5%. Because the power supply connection of the common equipment is connected by adopting a copper wire, in order to amplify a detection signal, the conductive cross-sectional area of the conductive outer sleeve meets the condition that the total resistance value of the conductive wire is equal to (close to) that of the conductive outer sleeve, when the material of the conductive wire is selected, the resistivity of the conductive wire is larger than that of copper, and is generally optimal when the conductive wire is far larger than that of copper, the detection signal can be amplified, namely, the influence of the conductive wire is aggravated, and the material with the conductivity which is 80-200 times weaker than that of the copper is generally selected. Meanwhile, the conductive wire is a high-temperature form substance, so the influence of temperature on the material is also researched, and the research of the invention finds that the conductivity of the Inconel600 in the material is within 3 percent from the normal temperature to 550 ℃, so the Inconel600 material can be preferably used as the conductive wire, and simultaneously, the R is to ensure that the conductive wire is preferably made of the Inconel600 material3Is much smaller than R1、R2、RWTherefore, the material of the conductive outer sleeve needs to be studied correspondingly, and the material with high resistivity is adopted to enable R3Is much smaller than R1、R2In the present invention, the conductivity is preferably 80 to 200 times weaker than that of copper, and similarly, in order to solve the influence of temperature, an Inconel600 material may be selected.
Preferably, the liquid metal container is made of a high-temperature-resistant and corrosion-resistant conductive material, and can be provided with a liquid metal inlet and a liquid metal outlet to allow the liquid metal to flow.
Preferably, in order to prevent temperature expansion and change the cross section of the conductive wire, thereby affecting the resistance value, the resistance value further comprises a conductive wire outer sleeve sleeved outside the conductive wire, and the inner diameter of the conductive wire outer sleeve is equal to the outer diameter of the conductive wire. The conductive wire outer sleeve is a high-temperature-resistant insulating sleeve. The detection of the invention is more accurate and stable, the high temperature resistant insulating sleeve of the invention adopts a ceramic tube, namely, the outer wall of the conductive wire is completely encapsulated in a seamless way by adopting the ceramic sleeve.
a liquid level measuring method using a liquid metal level continuous measuring device includes the following steps:
A1, calculating RW，RWFrom conductive wire point B to lower terminal pointa resistance value of C;
A2, loading the DC power supply and recording the output voltage E of the DC power supplyinand recording the reading E of the voltmeter at the momentout；
A3, according to the formulaMeasurement and calculation of R1，R1The resistance value of the part of the conductive outer sleeve positioned between the liquid level and the point A is,
A4, according to R1the length of the part of the conductive outer sleeve positioned between the liquid level and the point A is measured and calculated in a linear relation with the length of the part of the conductive outer sleeve positioned between the liquid level and the point A, so that the height of the liquid level is measured and calculated;
a5, repeating A2-A4 steps continuously, recording the reading E of the voltmeter continuouslyoutAnd then continuously measuring R1，And then the liquid level height is continuously measured and calculated.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. The device can realize continuous measurement of the liquid level of the liquid metal in a flowing state, and has the advantages of high precision, durability, stability, high temperature resistance and no influence of high-temperature impact;
2. the device main body is made of Inconel600 materials, has stable performance at high temperature and is suitable for a liquid metal environment;
3. The Inconel600 outer sleeve and the liquid metal tank body of the device are fixed by the insulating sealing clamping sleeve, so that the device is good in insulating sealing performance and easy to install and disassemble;
The bottom of the Inconel600 sleeve is a blind end, so that liquid metal cannot enter the inside of the sleeve to cause leakage;
5, the Inconel600 wire is externally provided with a ceramic insulating sleeve, and the bottom of the Inconel600 wire is welded with the outer sleeve, so that the Inconel600 wire is suitable for a high-temperature environment;
6. A 24V standard power supply is used for supplying power, so that the safety and the reliability are realized;
7. The high-precision voltmeter is used for measuring signals, so that the reading is convenient, and the accuracy is high;
8. The circuit design is simple and reasonable, and the connection is convenient.
Drawings
the accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a block diagram of the present invention.
Fig. 2 is an equivalent circuit diagram of the present invention.
the reference numerals in the figures are denoted respectively by: 1. the device comprises a direct current power supply, 2, a voltmeter, 3, an insulating sealing clamping sleeve, 4, a conductive wire, 5, a liquid metal container, 6, liquid metal, 7, a conductive outer sleeve, 8 and a bottom welding spot.
Detailed Description
in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not to be construed as limiting the present invention.
Example one
A liquid metal liquid level continuous measuring device,
The method comprises the following steps: the electric conduction outer sleeve, the electric conduction silk, survey electric part.
The conductive outer sleeve 7, one end of the conductive outer sleeve 7 is a closed end, the other end is an open end, the closed end is used for inserting into the liquid metal container and isolating the liquid metal in the liquid metal container from entering the conductive outer sleeve, the open end is arranged outside the liquid metal container, and the neck of the conductive outer sleeve is mounted on the liquid metal container in an insulating mounting mode by adopting an insulating sealing cutting sleeve 3;
the conductive wire 4 is inserted into the conductive outer sleeve from the open end of the conductive outer sleeve, and only one conductive connecting part C is formed between the conductive wire 4 and the conductive outer sleeve 7, and the conductive connecting part C is as follows: a conductive connecting part between the lower end part of the conductive wire 4 and the closed end part of the conductive outer sleeve 7;
The electricity measuring part comprises a direct current power supply 1 and a voltmeter 2, wherein the positive pole of the direct current power supply 1 is connected with a point A on the opening end part of the conductive outer sleeve 7, and the negative pole of the direct current power supply 1 is connected with a point B on the upper end part of the conductive wire 4; the positive pole of the voltmeter 2 is connected with a point D on the opening end part of the conductive outer sleeve 7, and the negative pole of the voltmeter 2 is connected with a point B on the upper end part of the conductive wire 4;
The position selection of the point A and the point D is carried out according to the requirement 1, and the requirement 1 is as follows: point a and point D are the same point or two points at the same height.
In the structure of the invention, the conductive outer sleeve 7 and the conductive wire 4 form a probe part, and the probe part and the electricity measuring part cooperate to form a device capable of continuously measuring the liquid level of the liquid metal integrally, wherein the end part of the conductive outer sleeve 7 inserted into the liquid metal is sealed to form a sealed end part, so that the high-temperature liquid metal can be prevented from entering the conductive outer sleeve 7, while the conductive wire of the core structure of the invention is completely positioned in the conductive outer sleeve 7, so that the conductive wire 4 is not contacted with the high-temperature liquid metal, the conductive wire is prevented from being corroded, the service life and the measurement precision are improved, and the device is particularly suitable for high-precision and long-time use under a high-temperature ring. The solution of continuous measurement is that, because the structure of the invention is that the conductive wire 4 is directly connected to the bottom of the conductive outer sleeve 7, and the current power supply 1 and the voltmeter 2 are loaded according to the above structure scheme, the structure is that the conductive outer sleeve 7 is divided into the part above the liquid surface and the part below the liquid surface, the upper part of the liquid surface is the interval from the liquid surface to the point A and the point D, the lower part of the liquid surface is the interval from the liquid surface to the closed end, in this case, the part above the liquid surface and the part below the liquid surface of the conductive outer sleeve 7 are (respectively) regarded as 2 resistances, and the resistances of the 2 parts are changed along with the change of the liquid surface, but the sum of the total resistances is not changed, and meanwhile, because the liquid metal 6 is conductive, the liquid metal 6 and the conductive outer sleeve 7 are connected in parallel at the boundary position, therefore, the liquid metal 6 and, wherein the resistance of the part above the liquid level of the conductive outer sleeve 7 is R1The resistance of the part below the liquid level of the conductive outer sleeve 7 is R2the liquid metal 6 and the liquid metal container 5 have a resistance R3Meanwhile, the conductive wire 4 can be regarded as 1 resistor RwUnder the structure, the equivalent circuitComprises a loop, a power supply and a resistor connected in series in the loop1、R2、Rw，R1connected to the positive pole of the power supply, Rw connected to the negative pole of the power supply, R2is connected in parallel with R3The anode of the anode power supply 1 of the voltmeter 2 is connected, and the cathode of the voltmeter 2 is connected with R in serieswIn this circuit, we find:EinOutput voltage for DC power supply 1, EoutFor the reading of voltmeter 2, we find that the parameters that can be known in this formula are: rW、Ein，Eout，R3And R is1And R2Is a parameter which dynamically changes along with the change of the liquid level and can not be directly obtained, and we find that R is the parameterWThe overall resistance of the material used is greater when it is less conductive, whereas the resistance of the liquid metal 6 and its part of the container 5 is very low due to the greater contact area between the outer conductive sleeve 7 used according to the invention and the liquid metal 6, where R is found to be3Is much smaller than R1、R2、RWr can therefore be ignored3Therefore, in the above case, the above formula can be simplified as:
wherein EinFor the output voltage of the power supply 1, 24V, R is generally selectedWMeasured at the time of device manufacture. By looking at the reading of the voltmeter, the resistance R can be measured1Value of (A)
And R is1The length of the upper part of the conductive outer sleeve 7 which is not submerged by the liquid metal is linearly related, and the length of the final submerged area can be calculated according to the linear relationship.
from the above analysis, we can see that the present invention is to realize continuous measurement, which mainly depends on the above special structure design, not only to satisfy the high temperature problem, but also to design a specific circuit design, in which case, according to the power value,voltmeter measured value and the preceding calculation of RWThereby obtaining R1according to the liquid level and R1The linear relationship of (a) gives the liquid level height. Therefore, the liquid level height at the moment can be conveniently calculated by actually and directly measuring the changed voltmeter value, the measurement is continuous, and any height can be measured.
Height of liquid level and R1The linear relationship is the section between the point a or D on the outer conductive sleeve 7 and the liquid level, the structure is a uniform structure, and the linear relationship can be measured according to the used material and the conductive performance, generally S P/Q R1S is the length, i.e., the position of the liquid surface determines the size of S, P is the resistivity of the material, and Q is the cross section.
Example two
On the basis of the first embodiment, it is preferable that the conductive wire is inserted into the conductive outer sleeve from the open end of the conductive outer sleeve, and the two ends of the conductive wire are respectively point B and point C. The position selection of the points B and C is performed according to the requirement 2, requirement 2: only one conductive connecting part C is formed between the conductive wire and the conductive outer sleeve, and the conductive connecting part C is as follows: a conductive connecting part between the lower end part of the conductive wire and the closed end part of the conductive outer sleeve; and the upper end point B of the conductive wire is respectively connected with the cathode of the direct current power supply and the cathode of the voltmeter.
EXAMPLE III
On the basis of the first embodiment, preferably, the conductive outer sleeve is made of a conductive material which has high resistivity and small resistance change rate with temperature, is high-temperature resistant and is corrosion-resistant, and the conductive wire is made of a conductive material which has high resistivity and small resistance change rate with temperature and is high-temperature resistant. In this case, since the power supply connection of the general apparatus is connected by a copper wire, in order to amplify the detection signal, the material of the conductive wire should be selected so that the resistivity thereof is larger than that of copper, and is generally most preferable to be larger than that of copper, so that the measurement signal can be amplified, that is, the influence of the conductive wire is increased, and the material is generally selected so that the conductivity thereof is 80 to 200 times weaker than that of copper. Meanwhile, the material is a high-temperature form substance, so the influence of temperature on the material is also researched, and the research of the invention discovers that Inconel600 in the materialThe change of the conductivity between normal temperature and 550 ℃ is within 3 percent, so that the Inconel600 material is preferably used as the conductive wire, and the R is ensured to be3Is much smaller than R1、R2、RWTherefore, the material of the conductive outer sleeve needs to be studied correspondingly, and the material with high resistivity is adopted to enable R3Is much smaller than R1、R2in the present invention, the conductivity is preferably 80 to 200 times weaker than that of copper, and similarly, in order to solve the influence of temperature, an Inconel600 material may be selected.
Example four
on the basis of the first embodiment, preferably, the liquid metal container is made of a high-temperature-resistant and corrosion-resistant conductive material, and may have a liquid metal inlet and outlet to allow the liquid metal to flow.
Example four
On the basis of the first embodiment, the electric conduction wire comprises an electric conduction wire outer sleeve sleeved outside the electric conduction wire, and the inner diameter of the electric conduction wire outer sleeve is equal to the outer diameter of the electric conduction wire. The conductive wire outer sleeve is a high-temperature-resistant insulating sleeve. Preferably, in order to prevent temperature expansion and change the cross section of the conductive wire, thereby affecting the resistance value and enabling the detection of the invention to be more accurate and stable, the high temperature resistant insulating sleeve of the invention adopts a ceramic tube, i.e. the outer wall of the conductive wire is completely encapsulated in a seamless way by the ceramic sleeve.
EXAMPLE five
On the basis of the first embodiment, the liquid level measuring method using the liquid metal liquid level continuous measuring device comprises the following steps:
A1, calculating RW，RWThe resistance value from the conductive wire point B to the lower end point C;
A2, loading the DC power supply and recording the output voltage E of the DC power supplyinAnd record the reading E of voltmeter 2 at that timeout；
A3, according to the formulameasurement and calculation of R1，R1the resistance value of the part of the conductive outer sleeve positioned between the liquid level and the point A is,
A4, according to R1The length of the part of the conductive outer sleeve positioned between the liquid level and the point A is measured and calculated in a linear relation with the length of the part of the conductive outer sleeve positioned between the liquid level and the point A, so that the height of the liquid level is measured and calculated;
A5, repeating the steps A2-A4 continuously, and recording the reading E of voltmeter 2 continuouslyoutAnd then continuously measuring R1，and then the liquid level height is continuously measured and calculated.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The liquid metal liquid level continuous measuring device is characterized in that,
The method comprises the following steps:
The conductive outer sleeve (7), one end of the conductive outer sleeve (7) is a closed end, the other end is an open end, the closed end is used for inserting into the liquid metal container and isolating the liquid metal in the liquid metal container from entering the conductive outer sleeve, the open end is arranged outside the liquid metal container, and the neck of the conductive outer sleeve is mounted on the liquid metal container in an insulating mounting mode by adopting an insulating sealing cutting sleeve (3);
the conductive wire (4) is inserted into the conductive outer sleeve from the open end of the conductive outer sleeve, and only one conductive connecting part C is formed between the conductive wire (4) and the conductive outer sleeve (7), wherein the conductive connecting part C is as follows: a conductive connecting part between the lower end part of the conductive wire (4) and the closed end part of the conductive outer sleeve (7);
The electricity measuring part comprises a direct current power supply (1) and a voltmeter (2), wherein the positive electrode of the direct current power supply (1) is connected with a point A on the opening end part of the conductive outer sleeve (7), and the negative electrode of the direct current power supply (1) is connected with a point B on the upper end part of the conductive wire (4); the positive pole of the voltmeter (2) is connected with a point D on the opening end part of the conductive outer sleeve (7), and the negative pole of the voltmeter (2) is connected with a point B on the upper end part of the conductive wire (4);
The position selection of the point A and the point D is carried out according to the requirement 1, and the requirement 1 is as follows: point a and point D are the same point or two points at the same height.
2. a continuous liquid metal level measuring device according to claim 1, characterized in that said conductive outer jacket (7) is made of a conductive material having a resistivity of P1 and a resistance rate of change with temperature of L1, and said conductive wire (4) is made of a conductive material having a resistivity of P2 and a resistance rate of change with temperature of L2; wherein, the values of P1 and P2 are both 80 times to 200 times of the resistivity of copper, and the values of L1 and L2 are 2% to 5%.
3. a continuous liquid metal level measuring device according to claim 1, characterized in that the cross-sectional area of the electrical conductivity of the outer conductive sleeve (7) is such that the total resistance of the electrical conductivity wire (4) is equal to the total resistance of the outer conductive sleeve (7).
4. The apparatus of claim 1, wherein the liquid metal container is made of a high temperature and corrosion resistant conductive material and has a liquid metal port to allow liquid metal to flow.
5. A continuous liquid metal level measuring device according to claim 1, characterized in that the outer conducting sleeve or/and the conducting wire (4) is made of Inconel600 material.
6. The liquid metal level continuous measurement device of claim 1, further comprising a conductive wire outer sleeve sleeved outside the conductive wire, wherein the inner diameter of the conductive wire outer sleeve is equal to the outer diameter of the conductive wire.
7. A continuous liquid metal level measurement device as claimed in claim 6, wherein the conductive wire jacket is a ceramic tube high temperature resistant insulating jacket.
8. Method for level measurement using a device for continuous measurement of the level of a liquid metal according to any one of claims 1 to 7, characterized in that it comprises the following steps:
a1, calculating RW，RWThe resistance value from the conductive wire point B to the lower end point C;
A2, loading the DC power supply and recording the output voltage E of the DC power supplyinAnd recording the reading E of the voltmeter (2) at the momentout；
A3, according to the formulameasurement and calculation of R1，R1The resistance value of the part of the conductive outer sleeve positioned between the liquid level and the point A is,
A4, according to R1The length of the part of the conductive outer sleeve positioned between the liquid level and the point A is measured and calculated in a linear relation with the length of the part of the conductive outer sleeve positioned between the liquid level and the point A, so that the height of the liquid level is measured and calculated;
A5, repeating A2-A4 steps continuously, recording the reading E of voltmeter (2) continuouslyoutand then continuously measuring R1And then the liquid level height is continuously measured and calculated.
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| CN109577953B (en) * | 2018-12-29 | 2023-12-22 | 青海岩土工程勘察咨询有限公司 | Drilling fluid liquid level monitoring device |
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