CN208653673U - Short branch electric thermo-couple temperature verifies furnace - Google Patents
Short branch electric thermo-couple temperature verifies furnace Download PDFInfo
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- CN208653673U CN208653673U CN201821306183.XU CN201821306183U CN208653673U CN 208653673 U CN208653673 U CN 208653673U CN 201821306183 U CN201821306183 U CN 201821306183U CN 208653673 U CN208653673 U CN 208653673U
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- 238000012795 verification Methods 0.000 claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 239000007787 solid Substances 0.000 claims abstract description 7
- 238000009413 insulation Methods 0.000 claims description 12
- 238000003780 insertion Methods 0.000 claims description 7
- 230000037431 insertion Effects 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 210000000746 body region Anatomy 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
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- 238000005259 measurement Methods 0.000 description 11
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- 238000013461 design Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000036760 body temperature Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
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Abstract
The utility model relates to short branch thermocouples, belong to short branch thermocouple detection field.A kind of short branch electric thermo-couple temperature verification furnace, it is characterized by comprising the intermediate blocks that reeded solid is arranged, the intermediate groove of the block of solid is to be inserted into the detection zone of short branch thermocouple to be measured, for measuring the temperature-control senser and temperature indicator of samming deblocking temperature, the burner hearth center of verification furnace is arranged in the block, uniform ring is around heater around four wall of burner hearth, it is heated evenly block, the heater is divided into two sections, temperature-control senser also includes two, it is separately positioned on close to block top and close to block bottom, bottom and fire door temperature are monitored and are controlled respectively, two temperature-control sensers are connected with temperature controller, two sections heater is separately connected by temperature controller and driving circuit, temperature controller uses double section temperature controls to provide uniformly effectively temperature for short branch thermocouple to be measured .
Description
Technical field
The utility model relates to electric thermo-couple temperature verification furnace more particularly to the temperature checking furnaces of short branch thermocouple.
Background technique
It needs to carry out Detection & Controling to temperature in many industries.Common temperature is calculated as platinum resistance, electric thermo-couple temperature
Meter, usually using thermostats such as water-bath or oil baths as constant temperature field when calibrating/calibration, the temperature uniformity of this kind of thermostat is preferable
Stability is high, is influenced by ambient temperature small, but the volume of this kind of thermostat is all huger, and temperature stabilization times are longer, Wu Faman
Foot scene rapid verification or the needs of calibration.Temperature checking furnace (also known as stem body furnace) results from the measurement of thermometer in shipbuilding industry
And calibration, it is mainly characterized by that calibration equipment is small, and easy to carry, warming and cooling rate is fast, easy to operate, the heat with certain precision
Source can be used for the calibration of scene temperature meter and temperature system.
Due to the design feature of temperature check furnace itself, when calibrating temperature sensor using temperature checking furnace, calibration result
It is easy by the quantity of calibrated thermometer, geomery, the apolegamy of thermometer hole, calibration environment and temperature checking furnace own temperature
The influence of the factors such as characteristic.When using temperature checking furnace calibration temperature sensor, to consider in the use of calibration result above-mentioned
The influence of factor.For temperature checking furnace in order to provide relatively stable, uniform temperature measurement zone to temperature sensor, measurement zone should
Uniform warm area at least 40mm long.Current temperature magnitude can be shown by its temperature indicator.Temperature checking furnace is aobvious
The temperature value shown is usually the temperature value of temperature-control senser measurement, and the position of accuracy and the placement of temperature-control senser is by direct shadow
Ring the accuracy of measurement zone temperature.
The high temperature sensor of some special sizes, such as the platinum resistance or thermoelectricity of short branch (40~50) mm are calibrated now
Even sensor and short branch or the thermistor temperature sensor at right angle etc. be not all available temperature checking furnace and match as calibration
Set equipment come using.Because now all of temperature checking furnace is substantially using single hop temperature control, temperature-controlled precision is maintained at furnace
Heart bottom.Only tested temperature sensor can be inserted into temperature checking furnace bottom, just can guarantee the accuracy of metering.Work as standard
When not being inserted into temperature checking furnace isothermal block bottom, thermometric accuracy is uncontrolled and unpredictable.At present in the world
The smallest high temperature is AMETEK stem body temperature checker CTC1200, well depth 110mm with temperature checking furnace, when tested temperature
When the length of sensor is lower than 110mm, the calibration of temperature can not be just carried out to the pyrometer couple at present.And furnace heart jack ruler
Very little fixation can not also calibrate the temperature sensor of special thickness size.
Therefore, regulation in current " armoured thermocouple calibrating standard ", " this specification suitable for measurement range (- 40~
1100) DEG C, the calibration of cheap metal armoured thermocouple of the metal sleeve length not less than 500mm." metal sleeve length is less than
The thermocouple of 500mm is not suitable for the specification, needs self-editing calibration method.
But now many applications, such as petroleum opening/closed mouth flash point tester, automatic distillation instrument, condensation instrument,
Air-conditioning experiment porch, laboratory and workshop condition system for detecting temperature, or even including using on aircraft engine experiment porch
Temperature sensor is all that size is very short, and is the thermocouple of reducing type, and measuring section length dimension is 80mm or so, thermometric model
(300~800) DEG C are enclosed, when such pyrometer couple is calibrated by metrological service at present, temperature checking furnace is effectively warm not can guarantee
Under conditions of, standard couple and tested thermocouple are bundled, the verification same depth of furnace is inserted into and is calibrated, this
Kind way directly affects accuracy of measurement and uncertainty, and the calibrating standard useless that can refer to.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of short branch electric thermo-couple temperatures to verify furnace, solves present
The measurement of short branch thermocouple not can guarantee accuracy of measurement and uncertainty, and without the defect of calibrating standard reference.
Technical solution
A kind of short branch electric thermo-couple temperature verification furnace, it is characterised in that: the block including the intermediate reeded solid of setting,
The intermediate groove of the block of solid is to be inserted into the detection zone of short branch thermocouple to be measured, and the temperature control for measuring samming deblocking temperature passes
The burner hearth center of verification furnace is arranged in sensor and temperature indicator, the block, and uniform ring is around heating around four wall of burner hearth
Device is heated evenly block, and the heater is divided into two sections, and temperature-control senser also includes two, is separately positioned on and connects
Nearly block top and close to block bottom, is monitored and controls respectively to bottom and fire door temperature, two temperature controls sensings
Device is connected with temperature controller, is separately connected two sections heater, temperature control by temperature controller and driving circuit
Device uses double section temperature controls to provide uniform effective thermal field for short branch thermocouple to be measured.
Further, the short branch thermocouple to be measured is 75mm in the insertion depth of detection zone, and the temperature-control senser uses
Temperature-control heat couple, distance 40mm between upper and lower two temperature-control sensers.
Further, top heat insulation and bottom thermal insulation block are additionally provided on the block top and bottom.
Further, the red copper that the block uses thermal coefficient high is fixed above block with furnace core press strip for material.
Further, alundum tube fixed heater is used outside the block and temperature-control senser, around the heater
It is additionally provided with the uniform insulation portion for uniform temperature field, around the heater is wrapped up using ceramic fibre.
Further, the detection zone of the insertion short branch thermocouple to be measured among the block is provided with and short branch thermoelectricity to be measured
The jack of the even comparable different pore size of outer diameter.
Further, it is also uniformly disposed with heater strip in bottom of furnace body region, it is warm between the hole of block to control in furnace body
Difference；Auxiliary heater is provided in verification furnace fire door position.
Beneficial effect
The high-temperature temperature verification furnace of the short branch thermocouple of the utility model is heated by both-end and temperature controlling mode, two systems
Control connects each other again respectively, realizes effective thermal field of bottom of furnace body, while monitoring bottom and fire door temperature real-time control temperature
Output and heating power verify the operating temperature of furnace fire door position by the temperature-control senser, that is, temperature-control heat couple monitoring on top,
Then by the digital temperature control instument control output on the top connected and heating power, the temperature of fire door position is controlled, improves verification furnace
The temperature uniformity of working region axial direction；To realize the homogeneous temperature field within the scope of wide output temperature, using multichannel independent heating
Device driving circuit structure realizes that the segmentation point temperature region of temperature section compensates, ensure that thermal field under control of the microprocessor
Uniformity；The calibrating installation of the utility model has also filled up the short branch thermocouple of China's high temperature in (300~1000) DEG C section
Calibrating installation blank, provide the foundation to the research of the calibration standard of later short branch thermocouple.
Detailed description of the invention
Fig. 1 is the heater calibration schematic diagram of the utility model.
Wherein: the top 1- heat insulation, the temperature-control senser on the top 2-, 3- block, 4- alundum tube, the uniform heating portion 5-,
The temperature-control senser of the bottom 6-, 7- bottom thermal insulation block, 8- thermal insulation layer, 9- supporting block, 10- support frame, 11- upper heater, the bottom 12-
Seat, 13- bottom heater.
Specific embodiment
Combined with specific embodiments below and attached drawing, the utility model is further described.
Traditional high temperature heater calibration mostly uses single hop temperature control, i.e., only one heater around burner hearth, structure is relatively simple,
Cost is relatively low, has its reasonability in the lower field of requirement.It is this from the point of view of the vertical thermal field uniformity of collateral security
Design taken method makes the heating density of heater along axial direction side often by the density for changing heater heater strip
Attempt to carry out a degree of compensation to axial-temperature gradient to difference.However due to the output temperature of electric thermo-couple test furnace
Range is usually wider, and the heat exchange pattern of the leading position occupied by low, medium and high temperature section is not identical, so adopting
Wanting for entire temperature section can not be suitable for the mode that axial-temperature gradient compensates with this change heater strip density degree
It asks.And another main problem brought by this design is that output temperature and temperature uniformity are easy to be become by environment temperature
The influence of change, therefore existing most temperature correction furnaces are all without providing vertical thermal field.And vertically thermal field bring is not true
Fixed degree is the main source of temperature correction result uncertainty.
For the temperature checking furnace of short branch thermocouple, since insertion depth is shallower than existing temperature correction significantly
Furnace, it is just more difficult for the uniformity of the vertical thermal field of collateral security.When temperature is lower, moreover it is possible to some temperature-compensatings are used,
But when temperature is higher, traditional unistage type temperature control technique just be cannot achieve.Therefore, if using traditional unistage type temperature control
Technology tests just there is no possibility of success the property of technical indicator required by this project.Utility model people is in the shallow formula applied before
Miniature temperature verifies in furnace, the temperature range (50~300) DEG C of a set of temperature checking furnace of development, thermometric aperture (4~6) mm,
From temperature control range, temperature accuracy, heating method, temperature control method, structure design compared with the high temperature that the application is directed to verifies furnace
Deng all different.For the application primarily directed to temperature range (300~1000) DEG C, well depth is the temperature checking of (60~100) mm
Furnace, class of accuracy meet the requirement of II grade of cheap metal thermocouple of calibration.
As shown in Fig. 1, the utility model proposes a kind of high-temperature temperatures of short branch thermocouple to verify furnace, including solid samming
Block, solid block centre is the detection zone for being inserted into short branch thermocouple to be measured, for measuring the temperature-control senser of samming deblocking temperature
And the burner hearth center of verification furnace is arranged in temperature indicator, the block, burner hearth surrounding uniform ring makes samming around heater
Block is heated evenly, and temperature-control senser includes two, block top and block bottom is separately positioned on, to bottom and fire door temperature
Degree is monitored and controls respectively, and the heater is also classified into two sections, two temperature-control sensers with temperature controller phase
Even, the temperature controller is separately connected two sections heater by driving circuit, and double sections of temperature controls is used to pass to be tested
Sensor provides uniformly effective thermal field.
The high-temperature temperature verification furnace of the short branch thermocouple of the application is heated using both-end and temperature controlling mode, two systems are mutual
Connection realizes having for bottom of furnace body 40mm in short branch thermocouple to be measured in the case where the insertion depth of detection zone is only 75mm
Thermal field is imitated, while monitoring bottom and the output of fire door temperature real-time control temperature and heating power.When it is implemented, two can be used
It covers temperature-control heat couple and temperature digital controller controls operating temperature.Bottom temp is temperature control heat by the temperature-control senser 6 of bottom
Galvanic couple monitoring, then the bottom by connecting digital temperature control instument control output and bottom heater 13 heating power, to control furnace
Operating temperature in pipe is also uniformly disposed with heater strip in bottom of furnace body region, warm between the hole of block to control in furnace body
Difference.To reduce the influence that verification furnace fire door externally conducts heat, the upper heater 11 of auxiliary is provided in verification furnace fire door position.Pass through
The temperature-control senser 2 on top is the operating temperature of temperature-control heat couple monitoring verification furnace fire door position, then by the top that connects
Digital temperature control instument control output and heating power, control the temperature of fire door position, to further increase verification furnace working region
Axial temperature uniformity.To realize the homogeneous temperature field within the scope of wide output temperature, electricity is driven using multichannel separate heater
Line structure realizes that the segmentation point temperature region of temperature section compensates under control of the microprocessor.
The temperature-control senser uses temperature-control heat couple, distance 40mm between upper and lower two temperature-control sensers.
Top heat insulation and bottom thermal insulation block are additionally provided on the block top and bottom.The block is used and is led
The high red copper of hot coefficient is material, is fixed above block with furnace core press strip.Filling with insulation material between furnace core and shell.
Alundum tube fixed heater is used outside the block and temperature-control senser, is additionally provided with around the heater
For the uniform heating portion of uniform temperature field, around the heater is wrapped up using ceramic fibre.
The detection zone of insertion short branch thermocouple to be measured among the block is provided with and short branch thermocouple outer diameter to be measured
The jack of comparable different pore size.
It is also uniformly disposed with heater strip in bottom of furnace body region, to control in furnace body the temperature difference between the hole of block；In school
Furnace fire door position is tested provided with auxiliary heater.
To realize the uniform temperature field within the scope of total temperature, the multi-segment type temperature control design that heater uses in the utility model,
Heater independent for each section has a temperature sensor to be installed to close position, the temperature of this section of heater output
The independent signal sampling channel that signal is sent to controller carries out real-time sample detecting, and sampled signal is sent in CPU and participates in
It operation and handles and exports the duty cycle signals that one represents heating power and be sent to independent on control panel of this section of heater and drive
It is isolated on dynamic circuit, the links such as amplification are finally sent on this section of heater to generate required temperature output.Therefore from this
Multi-segment type temperature control technology is temperature control to be carried out using multiple closed control loops, and be directed to the biography of different temperature zones for matter
Hot feature carries out algorithm compensation targetedly to realize the control precision of full warm area and the temperature uniformity of axial direction.This can be real
It is segmented thermal field adjustable function, now to compensate the change of temperature field due to caused by thermal conduction characteristic difference under different temperature zones.To protect
Demonstrate,prove the heater calibration reliability, the heater strip coiling that heater need to be good using high-temperature oxidation resistance.
The calibration method that short branch thermocouple is carried out using above-mentioned short branch electric thermo-couple temperature verification furnace, using following steps:
Step 1: standard couple being put on into protection pipe, is inserted into respectively with insulation porcelain bead is put on by the short branch thermocouple in school
Into the suitable jack of the detection zone of temperature checking furnace, and the block bottom being inserted into temperature checking furnace, make its measurement end
It is on same radial section with the measurement end of standard couple；
Step 2: setting calibration point temperature records the show value of stem body furnace and with reference to temperature after temperature reaches and stablizes respectively
Spend the measured value of meter；
Step 3: calibration carries out point by point from low temperature to high temperature, and during heating, the intracorporal bottom temp of furnace is controlled by bottom
Temperature sensor monitoring, temperature controller receive the temperature signal of bottom temperature-control senser, control lower section by driving circuit and add
The heating power of hot device, to control the operating temperature in boiler tube, the operating temperature of fire door position is by being arranged in block top
The monitoring of top temperature-control senser, temperature controller receives the temperature signal of top temperature-control senser, passes through driving circuit control
The heating power of upper section heater processed, so that the temperature of fire door position is controlled, to reduce the shadow that verification furnace fire door externally conducts heat
It rings, improves the temperature uniformity of verification furnace working region axial direction；
Step 4: being measured twice on each calibration point: when changing calibration point setting, it should in set temperature
It is measured once when rising, when progress should drop in another one-shot measurement at a set temperature.
Temperature controller carries out temperature control using fuzzy-adaptation PID control in the step 3.PID control and fuzzy control are all
Each advantage and disadvantage for having oneself by oneself, fuzzy-adaptation PID control then can be in conjunction with the two advantages, complementary disadvantage.
The temperature parameter of temperature checking furnace is nonlinear.The temperature-rise period of calibrator, the actually liter of block
Heat is conducted to block by heater by warm process.Heat transfer between heater and block is nonlinear, and is heated
Device, block, thermal insulation material and air have heat transfer phenomenon from each other, therefore its heat transfer process is considerably complicated.
And the cooling of calibrator is mainly by natural cooling.On the other hand, the temperature of block loading condition and environment temperature to calibrator
Fluctuation degree also has a certain impact.Therefore with traditional PID control temperature checking furnace, the effect is unsatisfactory.It is fuzzy using combining
Control and the pid parameter Fuzzy self-tuning control of PID control, it is not only easy to use, robustness is stronger, and it is adaptable with it is smart
The characteristics such as true property, optimization system overall performance.
Temperature control uses fuzzy control rule, and when system deviation is larger, i.e. the absolute value of system deviation is more than or equal to
When deviation variation rate, then pattern fuzzy controllers are directly controlled using first and directly export control amount, respective heater is controlled
System then uses the control parameter of the second fuzzy controller on-line amending PID when system deviation is smaller, to reach control effect
Fruit.Pid parameter fuzzy control key is to determine pid parameter with fuzzy control, i.e., according to system deviation e and deviation variation rate
Ec, with fuzzy control rule online modification pid parameter.In different e and ec, real-time control parameter is found, control object is made
With good dynamic and static properties.
The high-temperature temperature verification furnace of the short branch thermocouple of the utility model is heated by both-end and temperature controlling mode, two systems
Control connects each other again respectively, realizes effective thermal field of bottom of furnace body 40mm, while monitoring bottom and fire door temperature real-time control
Temperature output and heating power pass through temperature-control senser, that is, temperature-control heat couple monitoring verification furnace fire door position work temperature on top
Degree controls the temperature of fire door position, to improve then by the digital temperature control instument control output on the top connected and heating power
Verify the temperature uniformity of furnace working region axial direction；It is only using multichannel to realize the homogeneous temperature field within the scope of wide output temperature
Vertical heater drive circuit structure realizes that the segmentation point temperature region of temperature section compensates under control of the microprocessor；This is practical
Novel calibrating installation has also filled up China calibration method of the short branch thermocouple of high temperature and school in (300~1000) DEG C section
The blank of standard apparatus provides the foundation to the research of the calibration standard of later short branch thermocouple.
Claims (7)
1. a kind of short branch electric thermo-couple temperature verifies furnace, it is characterised in that: including the intermediate block that reeded solid is arranged, Gu
The intermediate groove of the block of body is to be inserted into the detection zone of short branch thermocouple to be measured, and the temperature control for measuring samming deblocking temperature senses
The burner hearth center of verification furnace is arranged in device and temperature indicator, the block, around four wall of burner hearth uniform ring around heater,
It is heated evenly block, the heater is divided into two sections, and temperature-control senser also includes two, is separately positioned on close to equal
Warm block top and close to block bottom, is monitored and controls respectively to bottom and fire door temperature, two temperature-control sensers are equal
It is connected with temperature controller, two sections heater is separately connected by temperature controller and driving circuit, temperature controller is adopted
Uniform effective thermal field is provided with double sections of temperature controls for short branch thermocouple to be measured.
2. short branch electric thermo-couple temperature as described in claim 1 verifies furnace, it is characterised in that: the short branch thermocouple to be measured is being examined
Survey area insertion depth be more than or equal to 75mm, the temperature-control senser use temperature-control heat couple, upper and lower two temperature-control sensers it
Between distance 40mm.
3. short branch electric thermo-couple temperature as described in claim 1 verifies furnace, it is characterised in that: in the block top and bottom
It is additionally provided with top heat insulation and bottom thermal insulation block.
4. short branch electric thermo-couple temperature as claimed in claim 1 or 3 verifies furnace, it is characterised in that: the block is using thermally conductive
The high red copper of coefficient is material, is fixed above block with furnace core press strip.
5. short branch electric thermo-couple temperature as described in claim 1 verifies furnace, it is characterised in that: sensed in the block and temperature control
Alundum tube fixed heater is used outside device, the uniform insulation portion for uniform temperature field is additionally provided with around the heater, uses
Ceramic fibre wraps up around the heater.
6. short branch electric thermo-couple temperature as described in claim 1 verifies furnace, it is characterised in that: insertion among the block to
The detection zone for surveying short branch thermocouple is provided with jack with the short comparable different pore size of branch thermocouple outer diameter to be measured.
7. short branch electric thermo-couple temperature as described in claim 1 verifies furnace, it is characterised in that: also uniform in bottom of furnace body region
It is disposed with heater strip, to control in furnace body the temperature difference between the hole of block；Auxiliary heater is provided in verification furnace fire door position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821306183.XU CN208653673U (en) | 2018-08-14 | 2018-08-14 | Short branch electric thermo-couple temperature verifies furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821306183.XU CN208653673U (en) | 2018-08-14 | 2018-08-14 | Short branch electric thermo-couple temperature verifies furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208653673U true CN208653673U (en) | 2019-03-26 |
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ID=65789411
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821306183.XU Expired - Fee Related CN208653673U (en) | 2018-08-14 | 2018-08-14 | Short branch electric thermo-couple temperature verifies furnace |
Country Status (1)
| Country | Link |
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| CN (1) | CN208653673U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680285A (en) * | 2018-08-14 | 2018-10-19 | 上海市计量测试技术研究院 | The calibration method of short branch electric thermo-couple temperature verification stove and short branch thermocouple |
-
2018
- 2018-08-14 CN CN201821306183.XU patent/CN208653673U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680285A (en) * | 2018-08-14 | 2018-10-19 | 上海市计量测试技术研究院 | The calibration method of short branch electric thermo-couple temperature verification stove and short branch thermocouple |
| CN108680285B (en) * | 2018-08-14 | 2024-06-07 | 上海市计量测试技术研究院 | Short thermocouple temperature calibration furnace and short thermocouple calibration method |
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