CN103162768B - Preparation method of heating type thermocouple liquid level measurement sensor - Google Patents
Preparation method of heating type thermocouple liquid level measurement sensor Download PDFInfo
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Abstract
The invention relates to a preparation method of a heating type thermocouple liquid level measurement sensor. According to the preparation method of the heating type thermocouple liquid level measurement sensor, prepared heating elements and prepared armored cables are assembled together and fully sealed so that the heating type thermocouple liquid level measurement sensor can be obtained. The heating type thermocouple liquid level measurement sensor prepared through the method has the advantages of being capable of accurately judging a liquid-gas (vapor) interface under the conditions of high temperature and high pressure, good in reproducibility and high in resolution, capable of meeting requirements of an overload test, capable of accurately judging the liquid-gas (vapor) interface under severe environments of high temperature and high pressure, simple in process and good in uniformity of products.
Description
Technical field
The present invention relates to a kind of preparation method of sensor, particularly a kind of preparation method of heating-type thermocouple BL.
Background technology
At present, the level measuring in pressure vessel often adopts sheathed cable formula sensor to measure, and this sensor has following deficiency: 1, conventional sheathed cable (such as armoured thermocouple) can not differentiate liquid-gas interface; 2, conventional sheathed cable (such as sheathed heater) can not tell liquid-gas interface, can not be used for level gauging.Existing heating-type thermocouple BL, adopt the external product produced, its cost is high, maintenance difficult, seriously constrains the development of China's level measuring technology.Therefore, find a kind of production technology, it is fine that the heating-type thermocouple BL making it obtain can meet repdocutbility, resolution is high, the requirements such as overload test can be met, accurately can judge the technical requirement at liquid gas (vapour) interface under the rugged surroundings such as High Temperature High Pressure, can reduce production cost again, be this area problem demanding prompt solution.
Summary of the invention
Object of the present invention, is to provide a kind of preparation method of heating-type thermocouple BL, adopts the obtained sensor of the method accurately can judge the sensor at liquid gas (vapour) interface at high temperature under high pressure.This sensor repdocutbility is fine, and resolution is high, can meet the requirements such as overload test, accurately can judge liquid gas (vapour) interface under the rugged surroundings such as High Temperature High Pressure, and technique is simple, and product unitarity is good.
Realizing technical solutions according to the invention is:
The preparation method of heating-type thermocouple BL, has following steps:
1) by heater strip doubling, and one end of doubling is fixed on ceramic pipe, the two ends of heater strip, on ceramic pipe, are compiled in one end of ceramic pipe by the other end equidistant double wrap subsequently, fixing;
2) the ceramic pipe outside surface being wound with heater strip described in step 1) is coated with last layer powdered frit, sinters 10 minutes, be cooled to room temperature under the high temperature of 800 DEG C;
3) regulating step 2) described in the ceramic pipe after sintering on the resistance value of heater strip, make its resistance value be 20 ± 0.1 Ω, obtain heating element;
4) Magnesium oxide knob insulator with four through holes is got at 2100 DEG C of sintering after 1 hour, cool with stove, according to clockwise direction and according to the order of positive pole thermocouple wire, nickel down-lead, negative pole thermocouple wire, nickel down-lead, it is put in four through holes of Magnesium oxide knob insulator respectively, again Magnesium oxide knob insulator is penetrated in the second outer tube, be assembled into sheathed cable first product;
5) by the sheathed cable first product dog described in step 4), drawing, and then 800 DEG C of annealing 30 minutes, room temperature is cooled to;
6) dog, drawing and thermal treatment is carried out repeatedly according to the method described in step 5), until the second outer tube diameter is Φ 3.4 ~ Φ 3.5mm, stop drawing, the second outer tube and the Magnesium oxide knob insulator between positive and negative electrode thermocouple wire and nickel down-lead broken essence in drawing process becomes insulating powder;
7) sheathed cable after step 6) process is just being stripped out two ends, negative pole thermocouple wire and nickel down-lead, just make sheathed cable two ends, negative pole thermocouple wire and nickel down-lead stretch out the second outer tube, and then this sheathed cable is put into the inherent 300 DEG C of bakings of baking oven 6 hours, to one end sheathed cable of the second outer tube stretched out just, the top of negative pole thermocouple wire is welded into together with the second outer tube touches die bed hot junction, by other end sealant pouring and sealing, dry, test, selection thermoelectricity capability is good, and the sheathed cable that thermoelectricity capability is consistent, sealing obtains sheathed cable finished product,
8) heating element is got, the hot junction of the sheathed cable finished product of step 7) gained is inserted in the ceramic pipe in heating element, adopt argon arc welding, two nickel down-leads are welded to connect with two terminations of the heater strip of heating element one end respectively, requirement pad light, reliably, and sheathed cable and heating element are put in the first outer tube 6, first outer tube add after element end pours into insulating material, 450 DEG C are toasted 2 hours, end socket welds and is sealed with heating element end, guarantee welding end No leakage, size as requested gets the sheathed cable of its length, strip out the first outer tube away from just adding the sheathed cable of element end, negative pole thermocouple wire and nickel down-lead, 300 DEG C of bakings 6 hours, after meeting insulating requirements, with glue sealing non-solder end, dry, obtain heating-type thermocouple BL.
Heater strip described in step 1) adopts fusing point to be 1400 DEG C, and density is 8.4 grams/cubic millimeter, extensibility >=20, and resistivity 1.09 ± 0.05 μ Ω .m, coefficient of heat conductivity is 60.3 kj/m.h DEG C, and linear expansion coefficient is the metal material of 18.
Nickel down-lead described in step 4) adopts fusing point to be 1435 ~ 1446 DEG C, proportion is 8.80 ~ 8.95, coefficient of heat conductivity is 0.56 ~ 0.65(100 DEG C) card/centimetre. second. DEG C, resistance coefficient is the metal material of 9.2 μ Ω .cm ~ 9.7 μ Ω .cm (20 DEG C).
Negative pole thermocouple wire described in step 4) adopts temperature-coefficient of electrical resistance to be 1.13 × 10
-3/ DEG C ~ 1.25 × 10
-3/ DEG C, resistivity is the metal material of 0.266 μ Ω .m ~ 0.275 μ Ω .m.
Positive pole thermocouple wire described in step 4) adopts temperature-coefficient of electrical resistance to be 1.03 × 10
-3/ DEG C ~ 1.16 × 10
-3/ DEG C, resistivity is 0.688 μ Ω. the metal material of m ~ 0.755 μ Ω .m.
Described outer tube adopts stainless steel material.
Step 5), 6) described in drawing process in, variable quantity≤30% of the second outer tube diameter.
The distance that the positive and negative electrode thermocouple wire stretching out the second outer tube described in step 8) is welded to hot junction is 17mm; The distance that the nickel stretching out the second outer tube draws is 3mm.
Step 4) and the Magnesium oxide knob insulator described in step 8) and insulating powder are electric smelting level magnesium oxide, its purity >=99.5%.
Adopt the heating-type thermocouple BL that the inventive method is obtained, its principle is the significant difference based on heater coefficient of heat emission in gas (vapour) body and liquid, judges the accurate location at fluid gas (vapour) interface.
The present invention has following beneficial effect:
1. heating-type thermocouple BL of the present invention is combined by a heating element and sheathed cable two parts.Because heating element maintains firm power, have good stability, armoured thermocouple has good accuracy and reliability, and therefore heating-type thermocouple BL can be used in pressure vessel and carries out thermometric.
2. heating-type thermocouple BL of the present invention is studied from aspects such as starting material selection, design and manufacture technology, guarantee described sensor repdocutbility, high resolving power and superb load performance, therefore, described sensor ensure that sensitivity and the accuracy of signals collecting effectively.
3. adopt 316L stainless steel as outer tube, except effectively having adapted to pressure vessel resistance to elevated temperatures and decay resistance, also for the system of scratching of heating-type thermocouple BL provides great convenience, the most important thing is the reliability that ensure that level gauging.
The heating-type thermocouple BL adopting the method for the invention to make, accurately can judge the sensor at liquid gas (vapour) interface at high temperature under high pressure.This sensor repdocutbility is fine, and resolution is high, can meet the requirements such as overload test, accurately can judge liquid gas (vapour) interface under the rugged surroundings such as High Temperature High Pressure, and technique is simple, and product unitarity is good.
Accompanying drawing explanation
Fig. 1 is the structure diagram of sensor of the present invention.
In figure, 1 is insulating powder, and 2 is the second outer tube, and 3 is nickel down-lead, and 4 is negative pole thermocouple wire, and 5 is positive pole thermocouple wire, and 6 is the first outer tube, and 7 is heater strip, and 8 is ceramic pipe, and 9 is heating element.
Embodiment
The preparation method of heating-type thermocouple BL, is characterized in that, has following steps, see Fig. 1:
The making of heating element:
1) get heater strip 7, alignment is cleaned.By heater strip doubling, doubling one end is fixed on ceramic pipe 8, the other end is clipped on bobbin winder bracket, according to clockwise direction, heater strip is wrapped on ceramic pipe equidistantly, subsequently the two ends of heater strip are compiled in one end of ceramic pipe, fixing.Wherein heater strip adopts fusing point to be 1400 DEG C, and density is 8.4 grams/cubic millimeter, extensibility >=20, resistivity 1.09 ± 0.05 μ Ω .m, coefficient of heat conductivity is 60.3 kj/m.h DEG C, and linear expansion coefficient is the Cr20Ni80 material of 18, and the diameter of heater strip is 0.18 ~ 0.22mm; The diameter of ceramic pipe is 1.8 ~ 2.2mm, and thickness is 0.2 ~ 0.3mm.
2) the ceramic pipe outside surface being wound with heater strip described in step 1) is coated with last layer powdered frit, sinters 10 minutes, be cooled to room temperature under the high temperature of 800 DEG C;
3) regulating step 2) described in the ceramic pipe after sintering on the resistance value of heater strip, make its resistance value be 20 ± 0.1 Ω, obtain heating element 9.
The making of sheathed cable:
4) Magnesium oxide knob insulator with four through holes is got at 2100 DEG C of sintering after 1 hour, cool with stove, get the positive pole thermocouple wire 5 that length is equal, negative pole thermocouple wire 4, nickel down-lead 3 alignment, wiped clean, according to clockwise direction and according to positive pole thermocouple wire, nickel down-lead, negative pole thermocouple wire, it puts in four through holes of Magnesium oxide knob insulator by the order of nickel down-lead respectively, avoid negative pole thermocouple wire, positive pole thermocouple wire and nickel down-lead contact, to ensure that thermopair accepts thermopower and Received signal strength, again Magnesium oxide knob insulator is penetrated in the second outer tube 2, be assembled into sheathed cable first product, the identical length etc. of Magnesium oxide knob insulator and the second outer tube.Magnesium oxide knob insulator adopts electric smelting level magnesium oxide to make, magnesian purity >=99.5% of this electric smelting level, impurity F e, the content of Ca and Mn is respectively: Fe≤0.007%, Ca≤0.12%, Mn≤0.003%, the diameter of Magnesium oxide knob insulator is 8.2mm, on the equidistant concentric circles being arranged in distance center of circle 0.8mm of Magnesium oxide knob insulator four through holes; Second outer tube adopts 316L stainless steel material to make.
Wherein, nickel down-lead adopts fusing point to be 1435 ~ 1446 DEG C, and proportion is 8.80 ~ 8.95, and coefficient of heat conductivity is 0.56 ~ 0.65(100 DEG C) card/centimetre. second. DEG C, resistance coefficient is the metal material of 9.2 μ Ω .cm ~ 9.7 μ Ω .cm (20 DEG C), and the diameter of nickel down-lead is 1.0 ~ 1.1mm;
Negative pole thermocouple wire adopts temperature-coefficient of electrical resistance to be 1.13 × 10
-3/ DEG C ~ 1.25 × 10
-3/ DEG C, resistivity is the metal material of 0.266 μ Ω .m ~ 0.275 μ Ω .m, and its diameter is 1.55 ~ 1.62mm;
Positive pole thermocouple wire adopts temperature-coefficient of electrical resistance to be 1.03 × 10
-3/ DEG C ~ 1.16 × 10
-3/ DEG C, resistivity is 0.688 μ Ω. m ~ 0.755 μ Ω. and the Chromel material of m, its diameter is 1.55 ~ 1.62mm.
5) by described in step 4) sheathed cable first product dog, drawing, and then 800 DEG C annealing 30 minutes, be cooled to room temperature;
6) dog, drawing and thermal treatment is carried out repeatedly according to the method described in step 5), until the second outer tube diameter is Φ 3.4 ~ Φ 3.5mm, outer tube adopts stainless steel material, stop drawing, the second outer tube and the Magnesium oxide knob insulator between positive and negative electrode thermocouple wire and nickel down-lead broken essence in drawing process becomes insulating powder 1;
Step 5), 6) drawing process in, variable quantity≤30% of the second outer tube 2 diameter.
7) sheathed cable after step 6) process is just being stripped out two ends, negative pole thermocouple wire and nickel down-lead, just make sheathed cable two ends, negative pole thermocouple wire and nickel down-lead stretch out the two ends of the second outer tube, and then this sheathed cable is put into the inherent 300 DEG C of bakings of baking oven 6 hours, just stretch out one end sheathed cable of the second outer tube, the pad of negative pole thermocouple wire and the second outer tube top are welded into touches die bed, by other end encapsulating, dry, test, selection thermoelectricity capability is good, and the consistent sheathed cable of thermoelectricity capability is as certified products, sealing obtains sheathed cable finished product,
Assembling:
8) heating element is got, two nickel down-leads of the sheathed cable finished product of step 7) gained are welded to connect with two terminations of heating element heating one end silk respectively, solder joint requires level and smooth, light, then hot junction is inserted in the ceramic pipe in heating element, sheathed cable and heating element are put in the first outer tube 6 into (length of sheathed cable is greater than the first outer tube again, and stretch out the first outer tube away from heating element end), after the heating element end of the first outer tube pours into insulating material, 450 DEG C are toasted 2 hours, adopt the sealing of argon arc welding end socket, guarantee welding end No leakage, size as requested gets the sheathed cable of its length, just strip out the other end sheathed cable of the first outer tube, negative electricity thermo wires and nickel down-lead, 300 DEG C of bakings 6 hours, after meeting insulating requirements, with E-7 glue sealing non-solder end, dry, obtain heating-type thermocouple BL.Described insulating powder is electric smelting level magnesium oxide, and magnesian purity >=99.5% of this electric smelting level, the content of impurity F e, Ca and Mn is respectively: Fe≤0.007%, Ca≤0.12%, Mn≤0.003%.First outer tube adopts 316L stainless steel material to make equally.
Wherein the diameter of the first outer tube is about 4mm, and wall thickness is 0.2mm, and the diameter of the second outer tube is about 3.4 wall thickness is 0.2mm.
Embodiment 1
Above-mentioned preparation method is adopted to obtain heating-type thermocouple BL.In order to verify the repdocutbility of this sensor further, the present embodiment selects the low nickel down-lead of resistivity as the extension line of heating element, in order to resistance is reliable, stable, selects Ni20Cr80 as heater strip.In order to measure accurately and reliably, select Alumel as negative pole thermocouple wire, Chromel is as positive pole thermocouple wire, and nickel down-lead selects N7.
During work, heating element is supplied to a direct current constant current or constant voltage source, after its operating voltage or current stabilization, measures its potential value and is converted into corresponding temperature value; Then still in heating and sensor under being in steady state (SS) be immersed in the higher liquid state of heat transfer, observe the change of its potential value, and be converted into corresponding temperature value.The change of this sensor temperature is reflected by the size of electromotive force, and with the position at this (vapour) liquid interface that judges to give vent to anger.
Replica test:
Be provided with the voltage of 5.62V to heating-type thermocouple BL with YJ26M tri-road direct current stabilizer, measuring lead-in wire value with QJ31 type direct current list double bridge is 0.03 Ω, component value is 12.8 Ω, when after stable operating voltage, successively three times this sensor is placed on repetition test under boiling water and room temperature, its potential value, after a moment step decline, is and then continuous downtrending, until reach steady state (SS).Measure its potential value with HP34401A digital voltmeter and be converted into corresponding temperature, its test findings is in table 1.
Table 1
As can be seen from Table 1 this sensor response time fast (3 min.), temperature measurement accuracy high (< ± 1.5 DEG C), repdocutbility is good.
Performance test:
In order to test the performance of heating-type thermocouple BL further, DC constant voltage power supply is passed to the sensor that a resistance is 12.7 Ω with YJ26M tri-road direct current stabilizer power supply, after electromotive force is stable, measure its potential value (temperature), then this sensor is placed in boiling water, measures the change of its potential value (temperature) with HP34401A digital voltmeter.Change the size of voltage, repeat process of the test above, its test findings is in table 2.
Table 2
As can be seen from Table 2: along with the increase of voltage, the power of this sensor also constantly increases, and the temperature of its heating element heats is also higher, and along with the increase of heating element heats temperature in sensor, its temperature difference in boiling water is also increasing.
Test findings shows, the resolution at liquid gas (vapour) interface of the sensor adopting the method described in embodiment 1 to prepare is higher.
embodiment 2:
Manufacture heating-type thermocouple BL, concrete steps are as follows:
Prepare heating element:
1) by heater strip doubling, and doubling one end is fixed on ceramic pipe, the two ends of heater strip, on ceramic pipe, are collected in one end of ceramic pipe by the other end equidistant double wrap subsequently, fixing.Wherein heater strip adopts fusing point to be 1400 DEG C, and density is 8.4 grams/cubic millimeter, extensibility >=20, resistivity 1.09 ± 0.05 μ Ω .m, coefficient of heat conductivity is 60.3 kj/m.h DEG C, and linear expansion coefficient is the Cr20Ni80 material of 18, and the diameter of heater strip is 0.18 ~ 0.22mm; The diameter of ceramic pipe is 1.8 ~ 2.2mm, and thickness is 0.2 ~ 0.3mm.
2) the ceramic pipe outside surface being wound with heater strip described in step 1) is coated with last layer powdered frit, sinters 10 minutes, be cooled to room temperature, obtain heating element under the high temperature of 800 DEG C.
3) regulating step 2) described in the ceramic pipe after sintering on the resistance value of heater strip, make its resistance value be 20 ± 0.1 Ω.
Prepare sheathed cable:
Step 1: cut-off footpath be the Alumel material of 1.60mm as negative pole thermocouple wire, alignment wiped clean is stand-by; Cut-off footpath be the Chromel material of 1.60mm as positive pole thermocouple wire, alignment wiped clean is stand-by; Cut-off footpath be the N7 material of 1.0mm as nickel down-lead, alignment wiped clean is stand-by; Cut-off footpath is 12mm, and thickness is that the 316L stainless steel outer sleeve pipe wiped clean of 0.6mm is stand-by; After Magnesium oxide knob insulator is sintered 1 hour at 2100 DEG C, stand-by with stove cooling, the diameter of described Magnesium oxide knob insulator is 8.1mm, has four through holes in this Magnesium oxide knob insulator, and the diameter of this through hole is 1.8mm; The identical length etc. of negative pole thermocouple wire, positive pole thermocouple wire, nickel down-lead, Magnesium oxide knob insulator and 316L stainless steel outer sleeve pipe;
Step 2: according to clockwise direction, respectively positive pole thermocouple wire, nickel down-lead, negative pole thermocouple wire, nickel down-lead, penetrates in four through holes in Magnesium oxide knob insulator, then is penetrated in outer tube by insulation porcelain knob, thus be assembled into sheathed cable first product;
Step 3: the sheathed cable first product of assembling in step 2 is carried out dog, drawing, and then by this sheathed cable first product 800 DEG C of annealing 30 minutes, be cooled to room temperature;
Step 4: carry out repeatedly dog, drawing and thermal treatment according to the process described in step 3, until when outer tube diameter is Φ 3.5mm, stops drawing; In each drawing process, the variable quantity of outer tube diameter equals 30%, the insulating powder of the Magnesium oxide knob insulator broken pure powdering in drawing process between outer tube and positive and negative electrode thermocouple wire and nickel down-lead;
Step 5: be 1.5 meters/root by length under the sheathed cable after step 4 processes, lower 2 altogether, strip out positive and negative electrode thermocouple wire and the nickel down-lead at 2 sheathed cable two ends, the positive and negative electrode thermocouple wire at sheathed cable two ends and nickel down-lead is made to stretch out outer tube, and then 2 sheathed cables are put into the inherent 300 DEG C of bakings of baking oven 6 hours, the argon arc welding of last one end is welded into the both positive and negative polarity hot junction of thermocouple wire and touches die bed, other end encapsulating, oven dry seal and obtain 2 sheathed cable finished products.
Step 6: the sheathed cable after step 5 processes is tested, stand-by after test passes.
Get above-mentioned sheathed cable, after this cable wiped clean, the positive and negative electrode thermocouple wire and the nickel down-lead that strip out two ends are stand-by;
Get heating element, by stand-by for this heating element wiped clean;
Get sheathed cable finished product, positive and negative electrode thermocouple wire is welded into hot junction, require that hot junction is 17mm to the distance of sheathed cable outer tube; And nickel down-lead is reserved length, require that nickel down-lead termination is 3mm to the distance of sheathed cable outer tube;
Step 6: get heating element, is welded the nickel down-lead of the heat lead of heating element and above-mentioned sheathed cable finished product by argon arc welding, requires that solder joint is level and smooth, bright;
Step 7: the heating element after step 6) process and sheathed cable load the first outer tube (length of sheathed cable is greater than the first outer tube, sheathed cable stretches out the other end of the first outer tube), then hot junction is inserted in the ceramic pipe in heating element, insulating material is poured at the heating element end (one end of the first outer tube) of the first outer tube, 450 DEG C of bakings 2 hours, adopt argon arc welding end socket heated sealed element end.Guaranteeing under the leak free prerequisite of welding end, take welding end as starting point, and sizing is lower length also, and strip out positive and negative electrode thermocouple wire and the nickel down-lead of the sheathed cable stretching out the first outer tube other end.
Step 8: the heating-type thermocouple BL processed through step 7 toasted 6 hours at 300 DEG C, after insulation meets the demands, with E-7 glue sealing non-solder end, dries and obtains heating-type thermocouple BL finished product.
Obtained 2 heating-type thermocouple BL according to the method described above, numbering is respectively 1# and 2#.
Detect 2 heating-type thermocouple BL, concrete testing result is as table 3, and from heating element test result, its resistance deviation is 0.002, and well heater consistance is fine; From thermopair potential value, thermopair also maintains the consistance of height, and therefore, 2 heating-type thermocouple BL maintain good consistance.
Table 3
Be provided with the voltage of 5.62V to 2 heating-type thermocouple BL with YJ26M tri-road direct current stabilizer, when after stable operating voltage, successively three times sensor is placed on repetition test under boiling water and room temperature, its potential value is after a moment step decline, and then in continuous downtrending, until reach steady state (SS).Measure its potential value with HP34401A digital voltmeter and be converted into corresponding temperature, its test findings is in table 4.
Table 4
2 heating-type thermocouple BL consistance are good as can be seen from Table 4, and the response time is fast, well can tell liquid gas interface.
In order to test the performance of heating-type thermocouple BL further, DC constant voltage power supply is passed to heating-type thermocouple BL with YJ26M tri-road direct current stabilizer power supply, after electromotive force is stable, measure its potential value (temperature), then this sensor is placed in boiling water, measures the change of its potential value (temperature) with HP34401A digital voltmeter.Change the size of voltage, repeat process of the test above, its test findings is in table 5.
Table 5
As can be seen from Table 5: along with the increase of voltage, the power of heating-type thermocouple BL also constantly increases, and the temperature of its heating element heats is also higher.And along with the increase of heating element heats temperature in sensor, its temperature difference in boiling water is also increasing.It can also be seen that 2 sensor consistance are fine from test findings, and can both resolution fluid gas (vapour) interface clearly.
When the load voltage of sensor is greater than 12V, heat 2 hours to heating-type thermocouple BL described in embodiment 2, then test its resistance value with DT9505 multi-function multimeter, whether see heating element because overload and open circuit.Its test findings is in table 6.
Table 6
Can see: this heating-type thermocouple BL still stands intact, so this sensor can meet the thermometric requirement of 0 DEG C ~ 350 DEG C completely about 730 DEG C work for 2 hours from table 6.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (8)
1. a preparation method for heating-type thermocouple BL, is characterized in that, has following steps:
1) by the doubling of heater strip, and doubling one end is fixed on ceramic pipe, the two ends of heater strip, on ceramic pipe, are compiled in one end of ceramic pipe by the other end equidistant double wrap subsequently, fixing;
2) the ceramic pipe outside surface being wound with heater strip described in step 1) is coated with last layer powdered frit, sinters 10 minutes, be cooled to room temperature under the high temperature of 800 DEG C;
3) regulating step 2) described in the ceramic pipe after sintering on the resistance value of heater strip, make its resistance value be 20 ± 0.1 Ω, obtain heating element;
4) Magnesium oxide knob insulator with four through holes is got at 2100 DEG C of sintering after 1 hour, cool with stove, according to clockwise direction and according to the order of positive pole thermocouple wire, a nickel down-lead, negative pole thermocouple wire, another nickel down-lead, it is put in four through holes of Magnesium oxide knob insulator respectively, again Magnesium oxide knob insulator is penetrated in the second outer tube, be assembled into sheathed cable first product; Described Magnesium oxide knob insulator is electric smelting level magnesium oxide, its purity >=99.5%;
5) by the sheathed cable first product dog described in step 4), drawing, and then 800 DEG C of annealing 30 minutes, room temperature is cooled to;
6) dog, drawing and thermal treatment is carried out repeatedly according to the method described in step 5), until the second outer tube diameter is Φ 3.4 ~ Φ 3.5mm, stop drawing, the second outer tube and the Magnesium oxide knob insulator between positive and negative electrode thermocouple wire and nickel down-lead broken essence in drawing process becomes insulating powder;
7) sheathed cable after step 6) process is just being stripped out two ends, negative pole thermocouple wire and nickel down-lead, just make sheathed cable two ends, negative pole thermocouple wire and nickel down-lead stretch out the second outer tube, and then this sheathed cable is put into the inherent 300 DEG C of bakings of baking oven 6 hours, to one end sheathed cable of the second outer tube stretched out just, the top of negative pole thermocouple wire is welded into together with the second outer tube touches die bed hot junction, by other end encapsulating, dry, test, selection thermoelectricity capability is good, and the sheathed cable that thermoelectricity capability is consistent, sealing obtains sheathed cable finished product,
8) heating element is got, the hot junction of the sheathed cable finished product of step 7) gained is inserted in the ceramic pipe in heating element, two nickel down-leads are welded to connect with two terminations of the heater strip of heating element one end respectively, and sheathed cable and heating element are put in the first outer tube, first outer tube add after element end pours into insulating material, 450 DEG C are toasted 2 hours, described insulating material is electric smelting level magnesium oxide, its purity >=99.5%, end socket welds and is sealed with heating element end, strip out the first outer tube away from just adding the sheathed cable of element end, negative pole thermocouple wire and nickel down-lead, 300 DEG C of bakings 6 hours, after meeting insulating requirements, with glue sealing non-solder end, dry, obtain heating-type thermocouple BL.
2. preparation method according to claim 1, it is characterized in that: the heater strip described in step 1) adopts fusing point to be 1400 DEG C, density is 8.4 grams/cubic millimeter, extensibility >=20, resistivity 1.09 ± 0.05 μ Ω m, coefficient of heat conductivity is 60.3 kj/mh DEG C, and linear expansion coefficient is the metal material of 18.
3. preparation method according to claim 1, it is characterized in that: the nickel down-lead described in step 4) adopts fusing point to be 1435 ~ 1446 DEG C, proportion is 8.80 ~ 8.95, at 100 DEG C, coefficient of heat conductivity is 0.56 ~ 0.65 card/cps DEG C, and at 20 DEG C, resistance coefficient is the metal material of 9.2 μ Ω cm ~ 9.7 μ Ω cm.
4. preparation method according to claim 1, is characterized in that: the negative pole thermo wires described in step 4) adopts temperature-coefficient of electrical resistance to be 1.13 × 10
-3/ DEG C ~ 1.25 × 10
-3/ DEG C, resistivity is the material of 0.266 μ Ω m ~ 0.275 μ Ω m metal.
5. preparation method according to claim 1, is characterized in that: the positive pole thermo wires described in step 4) adopts temperature-coefficient of electrical resistance to be 1.03 × 10
-3/ DEG C ~ 1.16 × 10
-3/ DEG C, resistivity is the metal material of 0.688 μ Ω m ~ 0.755 μ Ω m.
6. preparation method according to claim 1, is characterized in that: described outer tube adopts stainless steel material.
7. preparation method according to claim 1, is characterized in that: step 5), 6) described in drawing process in, variable quantity≤30% of the second outer tube diameter.
8. preparation method according to claim 1, is characterized in that: the distance that the positive and negative electrode thermocouple wire of stretching out the second outer tube described in step 8) is welded to hot junction is 17mm; The distance of stretching out the nickel down-lead of the second outer tube is 3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310104719.5A CN103162768B (en) | 2013-03-28 | 2013-03-28 | Preparation method of heating type thermocouple liquid level measurement sensor |
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| CN106768160B (en) * | 2017-03-10 | 2023-06-13 | 中国第一汽车股份有限公司 | Electric heating type urea liquid level sensor |
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| CN103000800A (en) * | 2012-12-19 | 2013-03-27 | 重庆材料研究院 | Method for manufacturing variable cross section of N-shaped sheathed thermocouple |
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| CN103000800A (en) * | 2012-12-19 | 2013-03-27 | 重庆材料研究院 | Method for manufacturing variable cross section of N-shaped sheathed thermocouple |
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| A novel encoding water level monitor system during and after LOCAs in a nuclear heating reactor;Wang Wenran等;《Nuclear Engineering and Design》;19981231;第179卷;275-280 * |
| K型和N型热电偶的性能对比;张祖力等;《功能材料》;20041231;第35卷;1718-1721 * |
| 温差式压力容器液位探测技术研究;何正熙等;《中国核动力研究设计院科学技术年报》;20091231;49-51 * |
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