CN203191029U - Heating type thermocouple liquid level measurement sensor - Google Patents
Heating type thermocouple liquid level measurement sensor Download PDFInfo
- Publication number
- CN203191029U CN203191029U CN 201320148341 CN201320148341U CN203191029U CN 203191029 U CN203191029 U CN 203191029U CN 201320148341 CN201320148341 CN 201320148341 CN 201320148341 U CN201320148341 U CN 201320148341U CN 203191029 U CN203191029 U CN 203191029U
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- thermocouple wire
- outer tube
- lead
- ceramic pipe
- heating element
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Abstract
The utility model relates to a heating type thermocouple liquid level measurement sensor. The sensor comprises a heating element and an armored cable, wherein the heating element is located in a first outer sleeve. The heating element comprises a heating wire and a ceramic pipe filled with insulting powder, the heating wire is wound on the ceramic pipe, two ends of the heating wire are gathered at one end of the ceramic pipe, and the outer surface of the ceramic pipe is covered with glaze powder in a sintering mode. The armored cable comprises an anode thermocouple wire, a cathode thermocouple wire, a nickel lead and a second outer sleeve. Insulating powder is filled among the anode thermocouple wire, the cathode thermocouple wire, the nickel lead and the second outer sleeve; the anode thermocouple wire, the cathode thermocouple wire and one end of the nickel lead extend out of the second outer sleeve, two ends of the second outer sleeve are sealed, and the armored cable is formed. The nickel lead of the armored cable is connected with the heating wire of the heating element, top ends of extending ends of both the anode thermocouple wire and the cathode thermocouple wire of the armored cable are welded to be hot contacts and are located in the ceramic pipe, and two ends of the first outer sleeve are sealed. The sensor is extremely good in reproducibility and high in resolution and can meet the requirements of overload tests and the like, a liquid gas (vapor) interface can be correctly judged under high temperature and high pressure, and uniformity is good.
Description
Technical field
The utility model relates to a kind of sensor, particularly a kind of heated type thermopair BL.
Background technology
At present, the level measuring in the pressure vessel often adopts sheathed cable formula sensor to measure, and this sensor has following deficiency: 1, Chang Gui sheathed cable (such as armoured thermocouple) can not be differentiated liquid-gas interface; 2, conventional sheathed cable (such as sheathed heater) can not be told liquid-gas interface, can not be used for level gauging.Existing heated type thermopair BL adopts the external product of producing, its cost height, and maintenance difficult has seriously restricted the development of China's level gauging technology.Therefore, how to obtain a kind of heated type thermopair BL, it is fine to make it satisfy repdocutbility, the resolution height, can satisfy requirements such as overload test, can accurately judge the technical requirement at liquid gas (vapour) interface under rugged surroundings such as High Temperature High Pressure, can reduce production costs again, be this area problem demanding prompt solution.
Summary of the invention
The purpose of this utility model provides a kind of heated type thermopair BL, and this sensor can accurately be judged the sensor at liquid gas (vapour) interface under High Temperature High Pressure.This sensor repdocutbility is fine, and the resolution height can satisfy requirements such as overload test, can accurately judge liquid gas (vapour) interface under rugged surroundings such as High Temperature High Pressure, and technology is simple, and the product unitarity is good.
Realize that technical scheme described in the utility model is:
Heated type thermopair BL, comprise the heating element and the sheathed cable that are positioned at first outer tube, wherein, heating element comprises heater strip and ceramic pipe, be filled with insulating powder in the ceramic pipe, described heater strip is wrapped on the ceramic pipe equidistantly, and the two ends of heater strip collect in an end of ceramic pipe, and the ceramic pipe outside surface sintering that is wound with heater strip is coated with powdered frit; Sheathed cable comprises positive and negative electrode thermocouple wire, nickel down-lead and second outer tube, described positive and negative electrode thermocouple wire and nickel down-lead according to the order arranged clockwise of anodal thermocouple wire, nickel down-lead, negative pole thermocouple wire, nickel down-lead in second outer tube, all being filled with insulating powder between nickel down-lead, anodal thermocouple wire, negative pole thermocouple wire, the nickel down-lead isolates, one end of positive and negative electrode thermocouple wire and nickel down-lead stretches out an end of second outer tube, other end welded seal with second outer tube, sheathed cable is formed in one end encapsulating, sealing; Two nickel down-leads of sheathed cable are connected with two terminations of the heater strip of heating element one end respectively, the top of the external part of the positive and negative electrode thermocouple wire of sheathed cable is welded into hot junction, the external part of positive and negative electrode thermocouple wire and hot junction all are positioned at ceramic pipe, have the heating element end to be provided with the welding end socket in first outer tube, the non-welding end of first outer tube is sealant pouring and sealing.
It is 1400 ℃ that described heater strip adopts fusing point, 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 ℃, linear expansion coefficient is 18 metal material.
It is 1435～1446 ℃ that described nickel down-lead adopts fusing point, and proportion is 8.80～8.95, and coefficient of heat conductivity is 0.56～0.65(100 ℃) card/centimetre. second. ℃, resistance coefficient is the metal material of 9.2 μ Ω .cm～9.7 μ Ω .cm (20 ℃).
It is 1.13 * 10 that described negative pole thermocouple wire adopts temperature-coefficient of electrical resistance
-3/ ℃～1.25 * 10
-3/ ℃, resistivity is the material of 0.266 μ Ω .m～0.275 μ Ω .m metal.
It is 1.03 * 10 that described anodal thermocouple wire adopts temperature-coefficient of electrical resistance
-3/ ℃～1.16 * 10
-3/ ℃, resistivity is the metal material of 0.688 μ Ω .m～0.755 μ Ω .m.
Described outer tube adopts stainless steel material.
The distance that the described positive and negative electrode thermocouple wire that stretches out second outer tube is welded to hot junction is 17mm; The distance of stretching out the nickel down-lead of second outer tube is 3mm.
Described insulating powder is electric smelting level magnesium oxide, its purity 〉=99.5%.
The diameter of described ceramic pipe is 1.8～2.2mm, and thickness is 0.2～0.3mm.
Adopt heated type thermopair BL described in the utility model, its principle is based on the significant difference of heater coefficient of heat emission in gas (vapour) body and liquid, judges the accurate position at fluid gas (vapour) interface.
The utlity model has following beneficial effect:
1. described heated type thermopair BL is combined by a heating element and sheathed cable two parts.Because heating element is kept firm power, has good stable, armoured thermocouple has good accuracy and reliability, and therefore, this sensor can be used in pressure vessel and carries out thermometric.
2. described heated type thermopair BL is studied from aspects such as starting material selection, design and manufacture technology, guarantees this sensor repdocutbility, high resolving power and superb load performance, has guaranteed sensitivity and the accuracy of signals collecting effectively.
3. described heated type thermopair BL adopts the 316L stainless steel as outer tube, except having adapted to pressure vessel resistance to elevated temperatures and decay resistance effectively, also the system of scratching for this sensor provides great convenience, the most important thing is to guarantee the reliability of level gauging.
Heated type thermopair BL described in the utility model can accurately be judged the sensor at liquid gas (vapour) interface under High Temperature High Pressure.This sensor repdocutbility is fine, and the resolution height can satisfy requirements such as overload test, can accurately judge liquid gas (vapour) interface under rugged surroundings such as High Temperature High Pressure, and technology is simple, and the product unitarity is good.
Description of drawings
Fig. 1 is the structure diagram of sensor described in the utility model.
Among the figure, 1 is insulating powder, and 2 is second outer tube, and 3 is nickel down-lead, and 4 is the negative pole thermocouple wire, and 5 is anodal thermocouple wire, and 6 is first outer tube, and 7 is heater strip, and 8 is ceramic pipe, and 9 is heating element.
Embodiment
Referring to Fig. 1, heated type thermopair BL comprises the heating element 9 and the sheathed cable that are positioned at first outer tube 6, and wherein, heating element comprises heater strip 7 and ceramic pipe 8, is filled with insulating powder 1 in the ceramic pipe.It is 1400 ℃ that described heater strip adopts fusing point, 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 ℃, and linear expansion coefficient is 18 metal material, 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.Described insulating powder is electric smelting level magnesium oxide, its purity 〉=99.5%, and impurity F e, the content of Ca and Mn is respectively: Fe≤0.007%, Ca≤0.12%, Mn≤0.003%.Described heater strip is wrapped on the ceramic pipe equidistantly, and the two ends of heater strip collect in an end of ceramic pipe, and the ceramic pipe outside surface that is wound with heater strip is coated with the powdered frit through one deck high temperature sintering; Sheathed cable comprises positive and negative electrode thermocouple wire, nickel down-lead and second outer tube, it is 1435～1446 ℃ that described nickel down-lead adopts fusing point, proportion is 8.80～8.95, coefficient of heat conductivity is 0.56～0.65(100 ℃) card/centimetre. second. ℃, resistance coefficient is the metal material of 9.2 μ Ω .cm～9.7 μ Ω .cm (20 ℃); It is 1.13 * 10 that described negative pole thermocouple wire adopts temperature-coefficient of electrical resistance
-3/ ℃～1.25 * 10
-3/ ℃, resistivity is the material of 0.266 μ Ω .m～0.275 μ Ω .m metal; It is 1.03 * 10 that described anodal thermocouple wire adopts temperature-coefficient of electrical resistance
-3/ ℃～1.16 * 10
-3/ ℃, resistivity is the metal material of 0.688 μ Ω .m～0.755 μ Ω .m.Just described, negative pole thermocouple wire and nickel down-lead are according to anodal thermocouple wire 5, nickel down-lead 3, negative pole thermocouple wire 4, the order arranged clockwise of nickel down-lead 3 is in second outer tube 2, nickel down-lead, anodal thermocouple wire, the negative pole thermocouple wire, all being filled with insulating powder between the nickel down-lead isolates, avoid the negative pole thermocouple wire, anodal thermocouple wire and nickel down-lead contact, accept thermopower and receive signal to guarantee thermopair, just, one end of negative pole thermocouple wire and nickel down-lead stretches out an end of second outer tube, other end welded seal with second outer tube, one end encapsulating, sheathed cable is formed in sealing; Two nickel down-leads of sheathed cable are connected with two terminations of the heater strip of thermal element one end respectively, the top of the external part of the positive and negative electrode thermocouple wire of sheathed cable is welded into hot junction, and the distance that the described positive and negative electrode thermocouple wire that stretches out second outer tube is welded to hot junction is 17mm; The distance of stretching out the nickel down-lead of second outer tube is 3mm.The external part of positive and negative electrode thermocouple wire and hot junction all are positioned at ceramic pipe, have the heating element end to be provided with the welding end socket in first outer tube, and the non-welding end of first outer tube is sealant pouring and sealing.Described outer tube adopts stainless steel material.
Embodiment 1
The described heated type thermopair of present embodiment BL selects the low nickel down-lead of resistivity as the extension line of heating element, and is reliable, stable for resistance, selects for use Ni20Cr80 as heater strip.In order to measure accurately and reliably, select for use Alumel as the negative pole thermo wires, Chromel is as anodal thermo wires, and nickel down-lead is selected N7, with the repdocutbility of further this sensor of checking.
During work, heating element is supplied to a direct current constant current or constant voltage source, treat its operating voltage or current stabilization after, measure its potential value and be converted into corresponding temperature value; Still being immersed in the higher liquid state of heat conduction at the sensor that heats and be under the steady state (SS), observe the variation of its potential value, and be converted into corresponding temperature value then.The variation of this sensor temperature reflects by the size of electromotive force, and judges the position at (vapour) liquid interface of giving vent to anger with this.
Replica test:
Be provided with the voltage of 5.62V for heated type thermopair BL with YJ26M three road direct current stabilizers, measuring the lead-in wire value with QJ31 type direct current list double bridge is 0.03 Ω, component value is 12.8 Ω, after stable operating voltage, successively three times this sensor is placed on repetition test under boiling water and the room temperature, and then its potential value is continuous downtrending, until reaching steady state (SS) after a moment, step descended.Measure its potential value with the HP34401A digital voltmeter and be converted into corresponding temperature, its test findings sees Table 1.
Table 1
This sensor response time fast (3 min.) as can be seen from Table 1, temperature measurement accuracy height (＜± 1.5 ℃), repdocutbility is good.
Performance test:
In order further to test the performance of heated type thermopair BL, the sensor that is 12.7 Ω to a resistance with YJ26M three road direct current stabilizer power supplys passes to the dc constant voltage power supply, after treating that electromotive force is stable, measure its potential value (temperature), then this sensor is placed in the boiling water, measures the variation of its potential value (temperature) with the HP34401A digital voltmeter.Change the size of voltage, process of the test above repeating, its test findings sees 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 heating is also more high, and along with the increase of heating element heating-up temperature in the sensor, its temperature difference in boiling water is also increasing.
Test findings shows that the resolution at liquid gas (vapour) interface of the sensor of employing embodiment 1 described method preparation is higher.
Embodiment 2:
Get 2 heated type thermopair BL and detect, 2 heated type thermopair level gaugings are numbered 1# and 2# respectively, concrete testing result such as table 3, and from the heating element test result, its resistance deviation is 0.002, the well heater consistance is fine.From the thermopair potential value, thermopair has also kept the consistance of height.2 heated type thermopair BL have kept good consistance.
Table 3
Be provided with the voltage of 5.62V for 2 heated type thermopairs of embodiment 2 gained BL with YJ26M three road direct current stabilizers, after stable operating voltage, successively three times sensor is placed on repetition test under boiling water and the room temperature, its potential value is after a moment, step descended, and then be continuous downtrending, until reaching steady state (SS).Measure its potential value with the HP34401A digital voltmeter and be converted into corresponding temperature, its test findings sees Table 4.
Table 4
2 heated type thermopairs of embodiment 2 gained BL high conformity as can be seen from Table 4, and the response time is fast, can well tell liquid gas interface.
In order further to test the performance of heated type thermopair BL, pass to the dc constant voltage power supply for embodiment 2 heated type thermopair BL with YJ26M three road direct current stabilizer power supplys, after treating that electromotive force is stable, measure its potential value (temperature), then this sensor is placed in the boiling water, measures the variation of its potential value (temperature) with the HP34401A digital voltmeter.Change the size of voltage, process of the test above repeating, its test findings sees Table 5.
Table 5
As can be seen from Table 5: along with the increase of voltage, the power of heated type thermopair BL also constantly increases, and the temperature of its heating element heating is also more high.And along with the increase of heating element heating-up temperature in the sensor, its temperature difference in boiling water is also increasing.It can also be seen that from test findings 2 sensor consistance are fine, and resolution fluid gas (vapour) interface that can both be clearly.
When the load voltage of sensor during greater than 12V, give embodiment 2 described heated type thermopair BL heating 2 hours, test its resistance value with the DT9505 multi-function multimeter then, see whether heating element opens circuit because of overload.Its test findings sees Table 6.
Table 6
Can see from table 6: this heated type thermopair BL is worked about 730 ℃ and was still stood intact in 2 hours, so this sensor can satisfy 0 ℃～350 ℃ thermometric requirement fully.
Explanation is at last, above embodiment is only unrestricted in order to the technical solution of the utility model to be described, although with reference to preferred embodiment the utility model is had been described in detail, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from aim and the scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (9)
1. heated type thermopair BL, it is characterized in that: this sensor comprises heating element and the sheathed cable that is positioned at first outer tube, wherein, heating element comprises heater strip and ceramic pipe, be filled with insulating powder in the ceramic pipe, described heater strip is wrapped on the ceramic pipe equidistantly, and the two ends of heater strip come together in an end of ceramic pipe, and the ceramic pipe outside surface sintering that is wound with heater strip is coated with powdered frit; Sheathed cable comprises positive and negative electrode thermocouple wire, nickel down-lead and second outer tube, described positive and negative electrode thermocouple wire and nickel down-lead according to the order arranged clockwise of anodal thermocouple wire, nickel down-lead, negative pole thermocouple wire, nickel down-lead in second outer tube, all being filled with insulating powder between nickel down-lead, anodal thermocouple wire, negative pole thermocouple wire, the nickel down-lead isolates, one end of positive and negative electrode thermocouple wire and nickel down-lead stretches out an end of second outer tube, other end welded seal with second outer tube, sheathed cable is formed in one end encapsulating, sealing; Two nickel down-leads of sheathed cable are connected with two terminations of the heater strip of heating element one end respectively, the top of the positive and negative electrode thermocouple wire external part of sheathed cable is welded into hot junction, the external part of positive and negative electrode thermocouple wire and hot junction all are positioned at ceramic pipe, have the heating element end to be provided with the welding end socket in first outer tube, the non-welding end of first outer tube is sealant pouring and sealing.
2. sensor according to claim 1 is characterized in that: it is 1400 ℃ that described heater strip adopts fusing point, 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 ℃, linear expansion coefficient is 18 metal material.
3. sensor according to claim 1, it is characterized in that: it is 1435～1446 ℃ that described nickel down-lead adopts fusing point, proportion is 8.80～8.95, coefficient of heat conductivity is 0.56～0.65(100 ℃) card/centimetre. second. ℃, resistance coefficient is the metal material of 9.2 μ Ω .cm～9.7 μ Ω .cm (20 ℃).
4. sensor according to claim 1 is characterized in that: it is 1.13 * 10 that described negative pole thermocouple wire adopts temperature-coefficient of electrical resistance
-3/ ℃～1.25 * 10
-3/ ℃, resistivity is the material of 0.266 μ Ω .m～0.275 μ Ω .m metal.
5. sensor according to claim 1 is characterized in that: it is 1.03 * 10 that described anodal thermocouple wire adopts temperature-coefficient of electrical resistance
-3/ ℃～1.16 * 10
-3/ ℃, resistivity is the metal material of 0.688 μ Ω .m～0.755 μ Ω .m.
6. sensor according to claim 1 is characterized in that: described outer tube employing stainless steel material.
7. sensor according to claim 1, it is characterized in that: the distance that the described positive and negative electrode thermocouple wire that stretches out second outer tube is welded to hot junction is 17mm; The distance of stretching out the nickel down-lead of second outer tube is 3mm.
8. sensor according to claim 1, it is characterized in that: described insulating powder is electric smelting level magnesium oxide, its purity 〉=99.5%.
9. sensor according to claim 1, it is characterized in that: the diameter of described ceramic pipe is 1.8～2.2mm, thickness is 0.2～0.3mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320148341 CN203191029U (en) | 2013-03-28 | 2013-03-28 | Heating type thermocouple liquid level measurement sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320148341 CN203191029U (en) | 2013-03-28 | 2013-03-28 | Heating type thermocouple liquid level measurement sensor |
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| CN203191029U true CN203191029U (en) | 2013-09-11 |
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| CN 201320148341 Expired - Lifetime CN203191029U (en) | 2013-03-28 | 2013-03-28 | Heating type thermocouple liquid level measurement sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015212655A1 (en) * | 2015-07-07 | 2017-01-12 | Gestra Ag | Measuring probe for detecting at least one measured variable of a fluid |
| CN110060799A (en) * | 2018-01-19 | 2019-07-26 | Te电线电缆有限公司 | Thermocouple stop/closure member and method |
| CN112494134A (en) * | 2020-11-27 | 2021-03-16 | 清华大学 | Thermocouple, heat ablation catheter with same and heat ablation device |
-
2013
- 2013-03-28 CN CN 201320148341 patent/CN203191029U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015212655A1 (en) * | 2015-07-07 | 2017-01-12 | Gestra Ag | Measuring probe for detecting at least one measured variable of a fluid |
| CN110060799A (en) * | 2018-01-19 | 2019-07-26 | Te电线电缆有限公司 | Thermocouple stop/closure member and method |
| US10753807B2 (en) | 2018-01-19 | 2020-08-25 | Te Wire & Cable Llc | Thermocouple termination/closure and method |
| US11060923B2 (en) | 2018-01-19 | 2021-07-13 | Te Wire & Cable Llc | Thermocouple termination/closure and method |
| CN112494134A (en) * | 2020-11-27 | 2021-03-16 | 清华大学 | Thermocouple, heat ablation catheter with same and heat ablation device |
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Granted publication date: 20130911 |
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