CN106500862B - A method of periodically the oxidation of thermocouple is compensated - Google Patents
A method of periodically the oxidation of thermocouple is compensated Download PDFInfo
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- CN106500862B CN106500862B CN201610907120.9A CN201610907120A CN106500862B CN 106500862 B CN106500862 B CN 106500862B CN 201610907120 A CN201610907120 A CN 201610907120A CN 106500862 B CN106500862 B CN 106500862B
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- thermocouple
- temperature
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- platinum
- agitator
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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
- G01K7/10—Arrangements for compensating for auxiliary variables, e.g. length of lead
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- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The present invention relates to platinum channel technologies, and the invention discloses a kind of methods periodically compensated to the oxidation of thermocouple, specifically include following step：Step 1: welding the first thermocouple on the outer wall at the agitator position of platinum channel, first thermocouple is used to detect the temperature of the platinum wall of platinum channel, and then obtains flowing through the temperature of the glass metal of platinum channel；Aperture is set on the outer wall before the agitator position of platinum channel, and the aperture is used to detect the temperature of tapping air for placing the second thermocouple, second thermocouple；Step 2: recording the reading value T of the first thermocouple under first time stable state when there is the load of first time stable state* SC, the second thermocouple reading value TCC*, load Q*And agitator directly heats power P* SC；Step 3: calculating the estimated value of the first thermocouple according to thermal capacitance formula.The accurate measurements of platinum channel temperature are realized by the above method.
Description
Technical field
The present invention relates to Thermocouples Technology, in particular to a kind of method that periodically oxidation of thermocouple is compensated.
Background technique
In the procedure for producing of TFT-LCD liquid crystal substrate glass, it is all be unable to do without platinum channel, by direct to platinum channel
It is powered, achievees the purpose that heat glass, point is welded with platinum-rhodium alloy thermocouple on platinum channel outer wall, and the thermocouple is for monitoring
Glass temperature, and heating power is adjusted with this, and then reach that glass temperature is controllable, produce the base plate glass of high-quality.Because of platinum
The temperature of golden channel, especially settling section is very high, reaches 1600 degree or more, long-time high temperature is run under being powered, platinum rhodium thermocouple
Aging can occur, i.e. rhodium evaporates faster than platinum, and the rhodium of evaporation penetrates into platinum by the surface of electrode or the measurement point of thermocouple
In extremely, so that " positive hole " energy of platinode be made to increase, absolute thermoelectric powers rate becomes smaller, so that thermocouple show value is distorted, and platinum
Golden channel is using thermostatic control, i.e., heating transformer according to the continuous output power of show value of thermocouple and is corrected.Therefore,
Once the show value of thermocouple is distorted, the chain distortion of series of values can be caused, temperature and viscosity can not be accurately monitored, cause
The rising of the glass defects such as platinum calculus, bubble, while also reducing the service life of platinum channel.
Summary of the invention
It is an object of the invention to：For thermocouple in the prior art in the condition of high temperature and long-play
The technical issues of show value distortion of generation, the invention discloses a kind of methods periodically compensated to the oxidation of thermocouple.
The technical solution adopted by the present invention is that such：
The invention discloses the invention discloses a kind of method periodically compensated to the oxidation of thermocouple, specific packets
Include following step：Step 1: the first thermocouple is welded on the outer wall at the agitator position of platinum channel, first heat
Galvanic couple is used to detect the temperature of the platinum wall of platinum channel, and then obtains flowing through the temperature of the glass metal of platinum channel；In platinum
Aperture is set on the outer wall before the agitator position in channel, and the aperture is for placing the second thermocouple, second heat
Galvanic couple is used to detect the temperature of tapping air；Step 2: record is for the first time when there is the load of first time stable state
The reading value T of first thermocouple under stable state* SC, the second thermocouple reading value TCC*, load Q*And agitator is direct
Heating power P* SC；Step 3: calculating the estimated value of the first thermocouple according to formula below：
Wherein：TCC is the current reading value of the second thermocouple, Q is current load, PSCIt is direct for current agitator
Heating power, C are the thermal capacitance of glass, and the value of α is more than or equal to 0.76 and is less than or equal to 0.86.Pass through above method meter
The estimated value of the first thermocouple is calculated, this estimated value avoids the problem of the aging bring detection inaccuracy of the first thermocouple,
Calculating process is simple and easy to do.
Further, the above method further include obtain the current reading value of the first thermocouple, and with the first thermocouple
Current estimated value is compared, and when difference is greater than certain threshold value and more number, the first thermocouple aging is determined, to repair
The desired temperature of positive first thermocouple.Operator is facilitated to understand the degree of aging of the first thermocouple, to make correctly
Processing mode.
Further, the above method further includes that the above method is used to the temperature of other high-temperature regions accurately to detect.
Further, first time stable state appears in corbel back slab latter week.At this point, emphasis carries out the parameter detected
It is recorded, so as to the use of subsequent calculating estimated value.
Further, agitator directly heats power and shows to obtain by transformer output power.
Further, the above method further includes wrapping up ceramic protective layer in the outside of the second thermocouple.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：By means of the present invention,
So that the display accuracy of thermocouple is greatly promoted, the heating power of reasonably optimizing heating transformer, to improve platinum channel
Service life.
Detailed description of the invention
Fig. 1 is the positional structure schematic diagram of placement aperture thermocouple of the invention.
Specific embodiment
Combined with specific embodiments below, the present invention is described in detail.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
The invention discloses a kind of methods periodically compensated to the oxidation of thermocouple, specifically include step below
Suddenly：Step 1: welding the first thermocouple on the outer wall at the agitator position of platinum channel, first thermocouple is for examining
The temperature of the platinum wall of platinum channel is surveyed, and then obtains flowing through the temperature of the glass metal of platinum channel；In the stirring of platinum channel
Bucket position set before outer wall on aperture is set, the aperture is for placing the second thermocouple, and second thermocouple is for examining
Survey the temperature of tapping air；Step 2: being recorded under first time stable state when there is the load of first time stable state
The reading value T of first thermocouple* SC, the second thermocouple reading value TCC*, load Q*And agitator directly heats power
P* SC；Step 3: calculating the estimated value of the first thermocouple according to formula below：
Wherein：TCC is the current reading value of the second thermocouple, Q is current load, PSCIt is direct for current agitator
Heating power, C are the thermal capacitance of glass, and the value of α is more than or equal to 0.76 and is less than or equal to 0.86.Pass through above method meter
The estimated value of the first thermocouple is calculated, this estimated value avoids the problem of the aging bring detection inaccuracy of the first thermocouple,
Calculating process is simple and easy to do.
Further, the above method further include obtain the current reading value of the first thermocouple, and with the first thermocouple
Current estimated value is compared, and when difference is greater than certain threshold value and more number, the first thermocouple aging is determined, to repair
The desired temperature of positive first thermocouple.Operator is facilitated to understand the degree of aging of the first thermocouple, to make correctly
Processing mode.
Further, the above method further includes that the above method is used to the temperature of other high-temperature regions accurately to detect.
Further, first time stable state appears in corbel back slab latter week.At this point, emphasis carries out the parameter detected
It is recorded, so as to the use of subsequent calculating estimated value.
Further, agitator directly heats power and shows to obtain by transformer output power.
Further, the above method further includes wrapping up ceramic protective layer in the outside of the second thermocouple.Second thermocouple
It being placed in the hole of the platinum channel before agitator, the external environment of this thermocouple is severe not as the first thermocouple,
Therefore, degree of aging is many slowly.By the conservation of energy of this thermocouple, so that accurately estimating position locating for the first thermocouple
The correct temperature set, to improve the validity of subsequent power control.
The invention discloses a kind of methods periodically compensated to the oxidation of thermocouple, specifically include step below
Suddenly：It is as follows by taking stirring barrel temperature as an example：
TSC est：The estimated value of the present temperature of agitator；
Q*：It is most to start the steady of (first time) (usually after the time of the latter week left and right of corbel back slab) after platinum channel starts
Determine the load of state.It is calculated by weighing, when the discharging difference of continuous several hours platinum channels is both less than the threshold value of setting, then
It may determine that as into stable state, load data can be weighed by glass and are calculated.Q*Unit K g/h；
Q：Present load (weighing conversion obtains)；
T* SC:The agitator thermocouple readings of the stable state most started after starting, agitator thermocouple is exactly background technique
Described in be welded on thermocouple on platinum channel outer wall, the thermocouple being welded on platinum channel outer wall can be detected directly
To the temperature on platinum surface, therefore the temperature for the glass metal inside platinum channel that circulates accurately is detected, agitator is
A part of platinum channel.
TCC*：The perforation thermocouple readings of the stable state most started after starting.Perforate thermocouple setting agitator it
On preceding platinum channel, perforation thermocouple is not what welding was got on, and perforation thermocouple is placed on the outer surface of platinum channel, is worn
Ceramic protective layer, Air Temperature of the perforation thermocouple on the platinum channel before detecting agitator is arranged in hole thermocouple
Degree.
TCC:Present perforation thermocouple readings.
PSC:Present agitator directly heats power.Shown by transformer output power it can be concluded that.
P* SC:The agitator of the stable state most started after starting directly heats power.
α:DHPS heating efficiency (substantially 0.80).Maximum value 0.86, minimum value 0.76, preferred value 0.80)；
C:The thermal capacitance of glass, generally 1.3KJ/kgK.
By the above calculation formula, the present true temperature of agitator can be calculated, and then by adjusting power, to reach
To stabilized glass temperature, the effect of regime flow.
Perforation thermocouple non-solder thermocouple, degree of aging can be very low, and variation is little；The derivation of equation follows specific heat capacity formula
With energy work rate formula：That is Cm △ T=q, q=Pt, therefore can accurately to obtain agitator present by the above method
Temperature, the calculated result are not influenced by agitator external welding thermocouple degree of aging, improve the precision of detection, avoid because
The problem of thermocouple aging bring readings inaccuracy.
Fig. 1 is the positional structure schematic diagram of placement aperture thermocouple of the invention, as shown in Figure 1, in the outer of platinum channel
The open hole for setting thermocouple of wall, in this way, aperture thermocouple can be directly placed on the outer wall of platinum channel, and then detects
The air themperature of corresponding position.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of method periodically compensated to the oxidation of thermocouple, specifically includes following step：Step 1: in platinum
The first thermocouple is welded on outer wall at the agitator position in channel, first thermocouple is used to detect the platinum of platinum channel
The temperature of wall, and then obtain flowing through the temperature of the glass metal of platinum channel；It is outer before the agitator position of platinum channel
Aperture is set on wall, and the aperture is used to detect the temperature of tapping air for placing the second thermocouple, second thermocouple
Degree；Step 2: recording the reading of the first thermocouple under first time stable state when there is the load of first time stable state
Value T* SC, the second thermocouple reading value TCC*, load Q*And agitator directly heats power P* SC；Step 3: according to
Under formula calculate the estimated value of the first thermocouple：
Wherein：TCC is the current reading value of the second thermocouple, Q is current load, PSCIt is directly heated for current agitator
Power, C are the thermal capacitance of glass, and the value of α is more than or equal to 0.76 and is less than or equal to 0.86.
2. the method periodically compensated as described in claim 1 to the oxidation of thermocouple, it is characterised in that the method is also
It including obtaining the current reading value of the first thermocouple, and is compared with the current estimated value of the first thermocouple, when difference is greater than
When certain threshold value and more number, the first thermocouple aging is determined.
3. the method periodically compensated as described in claim 1 to the oxidation of thermocouple, it is characterised in that the method is also
Temperature including the above method to be used for other high-temperature regions accurately detects.
4. the method periodically compensated as described in claim 1 to the oxidation of thermocouple, it is characterised in that stablize for the first time
State appears in corbel back slab latter week.
5. the method periodically compensated as described in claim 1 to the oxidation of thermocouple, it is characterised in that agitator is direct
Heating power shows to obtain by transformer output power.
6. the method periodically compensated as described in claim 1 to the oxidation of thermocouple, it is characterised in that the method is also
Including wrapping up ceramic protective layer in the outside of the second thermocouple.
7. the method that is periodically compensated to the oxidation of thermocouple as described in claim 1, it is characterised in that the value of the α is
0.8。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610907120.9A CN106500862B (en) | 2016-10-18 | 2016-10-18 | A method of periodically the oxidation of thermocouple is compensated |
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| CN201610907120.9A CN106500862B (en) | 2016-10-18 | 2016-10-18 | A method of periodically the oxidation of thermocouple is compensated |
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| CN106500862B true CN106500862B (en) | 2018-11-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109520642A (en) * | 2018-10-24 | 2019-03-26 | 郑州旭飞光电科技有限公司 | The acquisition methods and device of glass furnace, thermocouple oxidation rate |
| CN112947338B (en) * | 2021-02-10 | 2022-09-30 | 芜湖东旭光电科技有限公司 | Molten glass channel process control method and system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5655841A (en) * | 1992-07-01 | 1997-08-12 | Whessoe Varec, Inc. | Error-compensated temperature measuring system |
| CN101708945A (en) * | 2009-05-08 | 2010-05-19 | 河北东旭投资集团有限公司 | Method for accurately controlling viscosity of molten state glass in platinum channel |
| CN202382874U (en) * | 2011-12-07 | 2012-08-15 | 郑州旭飞光电科技有限公司 | Platinum channel thermocouple temperature measuring device |
| CN202849236U (en) * | 2012-07-30 | 2013-04-03 | 彩虹显示器件股份有限公司 | Thermocouple for platinum channel |
-
2016
- 2016-10-18 CN CN201610907120.9A patent/CN106500862B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5655841A (en) * | 1992-07-01 | 1997-08-12 | Whessoe Varec, Inc. | Error-compensated temperature measuring system |
| CN101708945A (en) * | 2009-05-08 | 2010-05-19 | 河北东旭投资集团有限公司 | Method for accurately controlling viscosity of molten state glass in platinum channel |
| CN202382874U (en) * | 2011-12-07 | 2012-08-15 | 郑州旭飞光电科技有限公司 | Platinum channel thermocouple temperature measuring device |
| CN202849236U (en) * | 2012-07-30 | 2013-04-03 | 彩虹显示器件股份有限公司 | Thermocouple for platinum channel |
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