CN105466590A - Thermocouple specially for high temperature - Google Patents
Thermocouple specially for high temperature Download PDFInfo
- Publication number
- CN105466590A CN105466590A CN201610009059.6A CN201610009059A CN105466590A CN 105466590 A CN105466590 A CN 105466590A CN 201610009059 A CN201610009059 A CN 201610009059A CN 105466590 A CN105466590 A CN 105466590A
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- CN
- China
- Prior art keywords
- protection tube
- high temperature
- measuring section
- thermopair
- inner sleeve
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention belongs to the field of temperature measurement equipment, and particularly relates to a thermocouple specially for high temperature, which comprises a protection tube internally provided with a thermoelectrode. One end of the protection tube is provided with a connection plug for being connected with a signal line and the thermoelectrode, the other end is a measurement section deeply extending in a measured environment, a fixing seat is arranged in the middle of the two ends, and a metal outer sleeve is arranged on the periphery of the measurement section. The thermocouple specially for high temperature is characterized in that one end of the metal outer sleeve is in sealing connection with the fixing seat, and the other end is opened; the periphery of the measurement section is coated with a ceramic inner sleeve; an annular air duct is formed between the protection tube and the ceramic inner sleeve; an air vent communicated with the annular air duct is arranged in the fixing seat; the air vent is used for blowing air in the annular air duct outside the measured environmemnt; and the air is used for protecting the measurement section of the protection tube from being oxidized and blowing away attachments on the surface of the protection tube. The thermocouple can measure the temperature and the temperature changes of a UO2 fuel pellet when sintered in a high temperatue furnace accurately, reliably and in real time.
Description
Technical field
The invention belongs to temperature measuring equipment field, be specifically related to a kind of high temperature special electric thermo-couple.
Background technology
In the reactor of current nuclear power station, the main fuel of (all light water reactors, heavy water reactor) is UO
2fuel pellet, UO
2fuel pellet has very high fusing point (2865 DEG C), adopts the UO that PM technique is produced
2fuel pellet, can obtain the pellet micromechanism of good gas cell distribution and suitable grain degree, and this is of great advantage at the operation irradiation of nuclear reactor for pellet.Do not consider the impact of material powder performance, affect UO
2the factor of fuel pellet sintering mainly contains: powder impurity element, compacting green compact, sintering condition and sintering atmosphere etc.UO
2its sintering process of fuel pellet belongs to solid-phase sintering, and under sintering atmosphere, contingent physics and chemical reaction comprise: gas desorption, Impurity removal, Reduction of Oxide and dissociation, metal are by the migration, surface diffusion etc. of gas phase.Sintering atmosphere will meet that acceleration of sintering carries out, reliable and secure principle.
UO
2fuel pellet is at a sintering temperature in high temperature furnace inside holding a period of time, sintering time and sintering temperature will finally affect product sintering effect, wherein the impact of sintering temperature is larger, and sintering temperature must meet the temperature requirement of goods final densities and other performance, otherwise sintering UO out
2fuel pellet part or most of controlling indicator will be defective, seriously will restrict the nuclear power production capacity of China.
Summary of the invention
For meeting China's nuclear industry to UO
2the demand of fuel pellet, need develop a kind of can be accurate, reliable, real-time measure UO
2temperature when fuel pellet sinters in high temperature furnace and the device of temperature variation, by this device can ensure temperature field, sintering zone temperature and uniform temperature, meet UO
2the requirement of fuel pellet sintering process.
For reaching above object, the technical solution used in the present invention is a kind of high temperature special electric thermo-couple, the protection tube of thermode is provided with in comprising, one end of described protection tube is provided with the connector lug for connection signal line and described thermode, the other end is the measuring section goed deep in test environment, is provided with holder, outside described measuring section, is arranged with metal jacket pipe in the middle of two ends, wherein said metal jacket pipe one end is tightly connected described holder, and the other end is opening; Described measuring section periphery is enclosed with ceramic inner sleeve; Form annular air channel between described protection tube and described ceramic inner sleeve, described holder is provided with the blow vent be communicated with described annular air channel; Described blow vent is used for being blown into gas in the export-oriented described annular air channel of test environment, and described gas is for preventing the measuring section of described protection tube oxidized and blow down the attachment on described protection tube surface.
Further, described gas is that exist in described test environment, that described protection tube can be prevented oxidized Purge gas or process gas.
Further, the top of the described measuring section of described protection tube extends to outside described ceramic inner sleeve; Described ceramic inner sleeve extends to outside described metal jacket pipe near the one end on the top of described measuring section.
Further, described connector lug adopts the form of seamless integral sealing, and the connection between described protection tube is for being tightly connected.
Further, described protection tube adopts molybdenum alloy to make.
Further, described thermoelectricity very two W-R silks.
Further, described test environment is high temperature furnace.
Beneficial effect of the present invention is:
1. achieve and ensure that the protection tube of molybdenum alloy avoids oxidized and farthest blown down by the attachment on protection tube by purging to blow vent ventilation, ensure thermometric accuracy.
2. at high temperature use for a long time because the gas leakage in the cracked test environment that may cause of porcelain bushing by adopting sealed wiring head to avoid thermopair.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of high temperature special electric thermo-couple described in the specific embodiment of the invention;
Fig. 2 is the exploded view of holder described in the specific embodiment of the invention, protection tube link position;
In figure: 1-connector lug, 2-protection tube, 3-blow vent, 4-holder, 5-pottery inner sleeve, 6-metal jacket pipe, 7-set nut, 8-pressure ring, 9-set collar, 10-double connection sleeve.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1, a kind of high temperature special electric thermo-couple provided by the invention (temperature element conventional in temperature measuring instrument, its direct measuring tempeature, and temperature signal is converted to thermopower signal, converted to the temperature of measured medium) by electric meter, (protection tube 2 adopts molybdenum alloy to make to be provided with the protection tube 2 of electric heating pole in comprising, electric heating is two W-R silks very), one end of protection tube 2 is provided with the connector lug 1 for connection signal line and electric heating pole (two W-R silks), the other end is the measuring section goed deep in test environment, holder 4 is provided with in the middle of two ends, be arranged on the metal jacket pipe 6 of measuring section periphery, metal jacket pipe 6 one end connection fixing base 4, the other end is opening, measuring section periphery is enclosed with ceramic inner sleeve 5, form annular air channel between protection tube 2 and ceramic inner sleeve 5, holder 4 is provided with the blow vent 3 that same annular air channel is communicated with, and blow vent 3 is for being blown into gas externally in annular air channel.The top of the measuring section of protection tube 2 extends to outside ceramic inner sleeve 5; Pottery inner sleeve 5 extends to outside metal jacket pipe 6 near the one end on the top of measuring section.
In the present embodiment, holder 4 and protection tube 2 are connected and sealed (see Fig. 2) by set nut 7, pressure ring 8, set collar 9, double connection sleeve 10.
The effect going deep into the outer wrap pottery inner sleeve 5 of the measuring section of the thermopair in test environment mainly contains three, one can reduce external temperature interference, increase thermometric accuracy, two rigidity that can improve thermopair, three can prevent impurity that the brick body in high temperature furnace sintering zone at high temperature volatilizees from gluing bonds on the protection tube 2 of electric heating pole, and then cause protection tube 2 break that (test environment is high temperature furnace, pottery inner sleeve 5 extends the part outside metal jacket pipe 6, its outside is the brick body of high temperature furnace sintering zone, the brick of sintering zone can produce volatilize impurities in the case of a high temperature, bond on protection tube 2 if these volatile substances are directly sticky, can Yin Gaowen cause protection tube 2 oxidized and then cause the breakage of protection tube 2).
Connector lug 1 adopts the form of seamless integral sealing; the hollow ball moulding with connection jaws in the present embodiment; inner for connection signal line and electric heating pole (two W-R silks); also adopt between connector lug 1 and protection tube 2 and be tightly connected; connection jaws also adopts after connecting extension instrument and is tightly connected, to ensure the sealing of whole connector lug 1 and protection tube 2 inside.Do like this and can ensure the measuring section of protection tube 2 in the test environment of high temperature (as to UO
2fuel pellet carries out in the high temperature furnace of pyroprocessing) when occurring breaking, in test environment, the atmosphere gas of (in high temperature furnace) can not leak through thermopair, such as ceramic inner sleeve 5 is broken, the atmosphere gas in test environment is caused to enter protection tube 2 interior (in high temperature furnace, the brick of sintering zone produces volatilize impurities in the case of a high temperature, if ceramic inner sleeve 5 is broken, these volatile substances can directly stickyly bond on protection tube 2, the breakage of protection tube 2 is caused because of high-temperature oxydation, atmosphere in such high temperature furnace will enter protection tube 2, connector lug 1 part of sealing is entered by protection tube 2, and the connector lug 1 of sealing avoids these gases entered to external leakage).
According to the atmosphere gas of test environment in the different operation phase, be blown into corresponding to atmosphere gas through blow vent 3 by test environment outside, the Purge gas that protection tube 2 can be prevented oxidized or process gas are (in the present embodiment, the gas be blown into is hydrogen and the nitrogen mixed gas of different proportion), the gas be blown into by constantly purging in the annular air channel between protection tube 2 and ceramic inner sleeve 5 in test environment, one can ensure that the protection tube 2 of molybdenum alloy avoids oxidized, second farthest the attachment on the measuring section of protection tube 2 is blown down, ensure the accuracy measured.
Finally, the practical application of thermopair provided by the present invention is illustrated.
UO
2fuel pellet needs to carry out high temperature sintering process in high temperature furnace, and be incubated a period of time at a sintering temperature, the measuring section of thermopair provided by the invention is inserted in high temperature furnace by the installation site on high temperature furnace, and being fixed on high temperature furnace by holder 4, the lead-in wire in connector lug 1 connects outside measurement instrument.When starting to carry out sintering processes, according to the atmosphere gas of the sintering environment in high temperature furnace at Different periods, be blown into corresponding to atmosphere gas from blow vent 3, the oxidized Purge gas of protection tube 2 or process gas (avoiding impacting sintering environment) can be prevented, the annular air channel of the gas be blown into through the measuring section periphery of thermopair enters in high temperature furnace, thus the volatile substance avoiding high temperature furnace brick body to produce is sticky on the protection tube 2 of molybdenum alloy, protection tube 2 is made to cause oxidation because of these volatile matters and then to break, farthest the attachment on the measuring section of protection tube 2 is blown down simultaneously, ensure the accuracy measured.The measurement instrument of result through being connected with outside of thermocouple measurement is changed, obtain the sintering temperature in high temperature furnace and holding temperature, and coordinate overtemperature automatically to cut off heating power supply to be applied in (such as movable beam type high-temperature heater) in high temperature furnace, to ensure accurately to control sintering temperature.When the connector lug 1 simultaneously sealed can prevent the measuring section of thermopair from breaking; the gas of the participation high temperature sintering in high temperature furnace through thermopair to external leakage (as ceramic inner sleeve 5 is broken; cause protection tube 2 oxidized and break, the hydrogen in high temperature furnace enters in protection tube 2).
Device of the present invention is not limited to the embodiment described in embodiment, and those skilled in the art's technical scheme according to the present invention draws and other embodiment belongs to technological innovation scope of the present invention equally.
Claims (7)
1. a high temperature special electric thermo-couple, the protection tube (2) of thermode is provided with in comprising, one end of described protection tube (2) is provided with the connector lug (1) for connection signal line and described thermode, the other end is the measuring section goed deep in test environment, holder (4) is provided with in the middle of two ends, metal jacket pipe (6) is arranged with outside described measuring section, it is characterized in that: described metal jacket pipe (6) one end is tightly connected described holder (4), and the other end is opening; Described measuring section periphery is enclosed with ceramic inner sleeve (5); Form annular air channel between described protection tube (2) and described ceramic inner sleeve (5), described holder (4) is provided with the blow vent (3) be communicated with described annular air channel; Described blow vent (3) for being blown into gas in the export-oriented described annular air channel of test environment, and described gas is used for preventing the measuring section of described protection tube (2) oxidized and blow down the attachment on described protection tube (2) surface.
2. thermopair as claimed in claim 1, is characterized in that: described gas is that exist in described test environment, that described protection tube (2) can be prevented oxidized Purge gas or process gas.
3. thermopair as claimed in claim 1, is characterized in that: the top of the described measuring section of described protection tube (2) extends to outside described ceramic inner sleeve (5); Described ceramic inner sleeve (5) extends to outside described metal jacket pipe (6) near the one end on the top of described measuring section.
4. thermopair as claimed in claim 1, it is characterized in that: described connector lug (1) adopts the form of seamless integral sealing, and the connection between described protection tube (2) is for being tightly connected.
5. thermopair as claimed in claim 1, is characterized in that: described protection tube (2) adopts molybdenum alloy to make.
6. thermopair as claimed in claim 1, is characterized in that: described thermoelectricity is two W-R silks very.
7. thermopair as claimed in claim 1, is characterized in that: described test environment is high temperature furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610009059.6A CN105466590B (en) | 2016-01-07 | 2016-01-07 | Special thermocouple of high temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610009059.6A CN105466590B (en) | 2016-01-07 | 2016-01-07 | Special thermocouple of high temperature |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105466590A true CN105466590A (en) | 2016-04-06 |
| CN105466590B CN105466590B (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610009059.6A Active CN105466590B (en) | 2016-01-07 | 2016-01-07 | Special thermocouple of high temperature |
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| CN (1) | CN105466590B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107606937A (en) * | 2017-09-07 | 2018-01-19 | 韶关市欧莱高新材料有限公司 | A kind of high-temperature atmosphere sintering furnace of the sealed thermocouple of band |
| CN112609159A (en) * | 2020-12-16 | 2021-04-06 | 尚越光电科技股份有限公司 | Co-evaporation equipment for assembling thermoelectric couple of CIGS (copper indium gallium selenide) thin-film solar cell |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3950992A (en) * | 1975-08-27 | 1976-04-20 | Leeds & Northrup Company | Immersion sampler for molten metal |
| CN200989831Y (en) * | 2006-12-27 | 2007-12-12 | 重庆仪表材料研究所 | High-temperature and high-voltage resisting electric thermo-couple for coal gasification furnace |
| CN101839774A (en) * | 2010-04-22 | 2010-09-22 | 北京航天计量测试技术研究所 | Composite tube type high-temperature thermocouple |
| CN102980674A (en) * | 2012-11-28 | 2013-03-20 | 安徽埃克森科技集团有限公司 | Intelligent protection method of thermocouple |
| CN202956215U (en) * | 2012-12-10 | 2013-05-29 | 重庆洋泰科技发展有限公司 | Constant-pressure air blowing thermocouple |
-
2016
- 2016-01-07 CN CN201610009059.6A patent/CN105466590B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3950992A (en) * | 1975-08-27 | 1976-04-20 | Leeds & Northrup Company | Immersion sampler for molten metal |
| CN200989831Y (en) * | 2006-12-27 | 2007-12-12 | 重庆仪表材料研究所 | High-temperature and high-voltage resisting electric thermo-couple for coal gasification furnace |
| CN101839774A (en) * | 2010-04-22 | 2010-09-22 | 北京航天计量测试技术研究所 | Composite tube type high-temperature thermocouple |
| CN102980674A (en) * | 2012-11-28 | 2013-03-20 | 安徽埃克森科技集团有限公司 | Intelligent protection method of thermocouple |
| CN202956215U (en) * | 2012-12-10 | 2013-05-29 | 重庆洋泰科技发展有限公司 | Constant-pressure air blowing thermocouple |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107606937A (en) * | 2017-09-07 | 2018-01-19 | 韶关市欧莱高新材料有限公司 | A kind of high-temperature atmosphere sintering furnace of the sealed thermocouple of band |
| CN107606937B (en) * | 2017-09-07 | 2023-05-09 | 广东欧莱高新材料股份有限公司 | High-temperature atmosphere sintering furnace with sealed thermocouple |
| CN112609159A (en) * | 2020-12-16 | 2021-04-06 | 尚越光电科技股份有限公司 | Co-evaporation equipment for assembling thermoelectric couple of CIGS (copper indium gallium selenide) thin-film solar cell |
| CN112609159B (en) * | 2020-12-16 | 2023-02-14 | 尚越光电科技股份有限公司 | Co-evaporation equipment for assembling thermoelectric couple of CIGS (copper indium gallium selenide) thin-film solar cell |
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| Publication number | Publication date |
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| CN105466590B (en) | 2020-08-25 |
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