CN101586991B - High-precision wide-temperature field electric thermo-couple test furnace - Google Patents
High-precision wide-temperature field electric thermo-couple test furnace Download PDFInfo
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- CN101586991B CN101586991B CN2009100532708A CN200910053270A CN101586991B CN 101586991 B CN101586991 B CN 101586991B CN 2009100532708 A CN2009100532708 A CN 2009100532708A CN 200910053270 A CN200910053270 A CN 200910053270A CN 101586991 B CN101586991 B CN 101586991B
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Abstract
The invention relates to a high-precision wide-temperature field electric thermo-couple test furnace, which includes: a main heating stove tube, which is characterized in that: axial bottoming hole troughs are equipped in the main heating stove tube, and are evenly distributed on the outer side of the main heating stove tube; the main heating stove tube inner side is also equipped with a thermometer hole trough for three-dimensional multi-point temperature measurement; the main heating stove tube outer liner is connected with assistant heating stove tube with several segments of adjustable space lengths to form a double-layer multistage heating stove tube nested structure, and the assistant heating stove tube is equipped with axial heating holes. Minor-diameter spiral tube type heater strip are rotatedly arranged in the main heating stove tube and the assistant heating stove tube in tube-perforating type. The high-precision wide-temperature field electric thermo-couple test furnace provided by the invention can easily meet the request of national verification procedure, the axial length of uniform temperature section can reach to twice of that in the national verification procedurerequest, and temperature differences between any two points in the test temperature field is half of that in the national verification procedure request, moreover the constant temperature time is gre atly reduced and the electromagnetic induction disturbance is greatly reduced.
Description
Technical field
The present invention relates to a kind of electric thermo-couple test furnace, especially a kind of exact constant temperature assay furnace.
Background technology
In thermocouple calibration and temperature transmission of quantity value process, the homogeneity of thermopair high temperature assay furnace central area temperature field is extremely important, and it directly influences the accuracy and the reliability of thermocouple calibration.Requirement by the test specification of national metrological verification regulations and assay furnace, the homogeneity in the highest temperature district that records in the time of 1000 ℃ is: the highest even warm area center of assay furnace and assay furnace geometric center depart from the line vertically and are not more than 10mm, and be not less than 60mm in even warm area length, radius is in the 14mm scope, and the point-to-point transmission temperature difference is not more than 1 ℃ arbitrarily.
Conventional electric thermo-couple test furnace structure is generally boiler tube+heater strip+heat-insulation layer+shell.Heater strip is a monofilament, winding for flat around.The electric thermo-couple test furnace of this kind structure, its temperature performance can't reach the requirement of national verification rules basically when no load test.Even its temperature performance has reached the requirement of national verification rules when no load test, but constant temperature time is very long, and when really being used for verification process, (have under the situation of carrying), because many outside heat conduction of tested thermocouple have destroyed original thermal equilibrium, make the more difficult requirement that reaches the national verification rules of performance of its temperature.Therefore, for a long time, below standard electric thermo-couple test furnace has become a big obstacle of finishing thermocouple calibration work in strict accordance with the national verification rules.
Disclosed about inventing and the utility model patent investigation according to China, the patent relevant with electric thermo-couple test furnace has five, wherein has one to be patent of invention.In these patents, relevant with content of the present invention has only three.The ZL93100127.7 patent of invention is said is the electric thermo-couple test furnace of receiving to working medium with liquid, the flat-temperature zone reaches 1298mm, but structure is very complicated, is unsuitable for commercial Application, temperature range is only at middle low-temperature zone (150 ℃ to 600 ℃), and the effective temperature that we consider now is 100 ℃ to 1200 ℃.In a single day the main points of ZL200520088706.4 utility model are to have designed one section air circular layer in the body of heater stage casing, in order that even up warm area peak, center, but complete, can not the real-time online adjustment.The main points of ZL200520088706.4 utility model are to have increased a sleeve pipe for anticreep, and just the hot buffer action by this sleeve pipe increases warm field width degree.Analyze from principle, this warm field width degree increase be incidentally with nonessential, if original temperature was bad, has increased a sleeve pipe and also can't tip the scales.In a word, existing patent all fail to solve well the present invention at problem.
Summary of the invention
The present invention will provide a kind of high-precision wide-temperature field electric thermo-couple test furnace, and this assay furnace has the high-precision wide-temperature field control of three-dimensional multi-point temperature measurement and motion of three-dimensional temperature field analysis and multiloop heating.
For achieving the above object, technical scheme of the present invention is: a kind of high-precision wide-temperature field electric thermo-couple test furnace, comprise main furnace tubing, and be characterized in: be provided with axial heating hole slot in the main furnace tubing, and be evenly distributed on the outside of main furnace tubing; Main furnace tubing inboard also is provided with the thermometric hole slot that three-dimensional multi-point temperature measurement is used; The auxilliary furnace tubing that main furnace tubing is socketed with the plurality of sections adjustable distance outward forms double-deck multistage furnace tubing nested structure, and auxilliary furnace tubing is provided with axial bottoming hole.
The poling formula is circled round and is arranged minor diameter helix tube type heater strip in main furnace tubing and the auxilliary furnace tubing.
The thermometric hole slot be separately positioned on main furnace tubing inboard before, during and after on three xsects, and position, four directions, upper and lower, left and right arranges that forming 12 measuring points constitutes a cylindrical three-dimensional thermometric network with the standard couple measuring point that is in the stove heart.
The invention has the beneficial effects as follows: the present invention adopts the assay furnace of said structure to have that programming rate is fast, the adjusting time short, evenly long the and little characteristics of electromagnetic induction interference of warm area.Concrete test result is: maximum temperature point is in the geometric center position of assay furnace; Qualified even warm area length surpasses 100mm; In radius was the 17mm scope, the point-to-point transmission temperature difference was not more than 0.5 ℃ arbitrarily.Be far superior to the standard of national metrological verification regulations.
Description of drawings
Fig. 1 is a structure principle chart of the present invention;
Fig. 2 is the sectional view of three sections double-deck furnace tubing nested structures of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of high-precision wide-temperature field electric thermo-couple test furnace of the present invention is made up of main furnace tubing 1, auxilliary furnace tubing 2, stiff end sleeve pipe 7, heat-insulation layer 8 and assay furnace housing 9.
As shown in Figure 2, main furnace tubing 1 outside has axial heating hole slot 3, and evenly distributes.Have bottoming hole 4 in the auxilliary furnace tubing 2, main furnace tubing 1 inboard has thermometric hole slot 5, and the centre is the perform region 6 of assay furnace.
The main furnace tubing 1 outer auxilliary furnace tubing 2 that is socketed with the plurality of sections adjustable distance forms double-deck multistage furnace tubing nested structure.
Main points of the present invention can be summed up as 5 points: special master, auxilliary furnace tubing 1,2, adjustable double-layer multistage furnace tubing nested structure, minor diameter helix tube type heater strip poling formula are circled round and are arranged a high precision temperature control idea of manufacturing process, three-dimensional multi-point temperature measurement and the motion of three-dimensional temperature field analysis and multiloop heating.
(1) special master, auxilliary furnace tubing
The boiler tube of traditional electric thermo-couple test furnace is generally light pipe or wire casing pipe.Heater strip is that monofilament is flat on boiler tube.The used furnace tubing of the present invention is custom-designed for improving an accurate temperature control performance.Referring to accompanying drawing 1, Fig. 2, be shaped on axial heating hole slot 3 in the main furnace tubing 1 in advance, be evenly distributed on main furnace tubing 1 outside, circle round for minor diameter helix tube type heater strip poling formula and arrange and to get ready.The thermometric hole slot 5 that the inboard also prefabricated three-dimensional multi-point temperature measurement of special main furnace tubing 1 is used is for three-dimensional multi-point temperature measurement and three-dimensional temperature field analysis are got ready.Special auxilliary furnace tubing 2 is provided with prefabricated bottoming hole 4, only is shaped on axial bottoming hole in advance.The caliber of special auxilliary furnace tubing 2 is bigger than special main furnace tubing, so the heating hole slot quantity of radial arrangement is more.
(2) adjustable double-layer multistage furnace tubing nested structure
Traditional electric thermo-couple test furnace all is an individual layer boiler tube single loop heating arrangement.Axial temperature distributes and is mountain peak shape, and uniform temperature field length falls short of.Forefathers are on the change heat-retaining condition or changing to add (to change around spacing as monofilament is flat) in the heat distribution has done many effort.Though can obtain improvement to a certain degree, lack online adjustment mechanism, transforming quality can not guarantee.Sometimes, correct one's mistakes not even as not changing.Perhaps, can reach the national rule requirement when unloaded, have when carrying just can not reach the national rule requirement.The present invention adopts double-deck multistage furnace tubing nested structure.Key is to have set up to change the online adjustment mechanism that adds heat distribution.For example, the temperature field length can reach the national rule requirement when unloaded, has when carrying the high right low situation in a left side to occur, as long as adjust the heating distribution power of the special auxilliary furnace tubing in both sides, uniform temperature field length just can guarantee the national rule requirement fully.The spacing of the special auxilliary furnace tubing in both sides and position can be adjusted according to a temperature test case in the fabrication phase in addition.Also have,, also can adopt auxilliary furnace tubing 2 designs more than three sections, axial temperature field is distributed control meticulouslyr if require a higher temperature performance.
(3) the minor diameter helix tube type heater strip poling formula layout manufacturing process of circling round
The manufacturing process of traditional electric thermo-couple test furnace is generally a heater strip monofilament and puts down on light pipe or wire casing pipe.Like this, be difficult to reach the qualified temperature major defect that requires, also have the problem that the thermopair in the boiler tube has been caused stronger electromagnetic interference (EMI) except having.For this reason, the present invention adopts the minor diameter helix tube type heater strip poling formula layout manufacturing process of circling round.Changing monofilament is minor diameter helix tube type heater strip, can solve the default problem that heat distribution is adjusted that adds.The heater strip monofilament is processed into the minor diameter helix earlier.On furnace tubing, circle round when laying, can adjust helix pitch according to adding the heat distribution needs.These are flat maneuverable more around spacing than adjusting monofilament.The purpose of laying of circling round on furnace tubing is the alternating magnetic field that the counteracting exchange current causes, thereby, weaken electromagnetic interference (EMI) widely to the thermopair in the boiler tube.
(4) three-dimensional multi-point temperature measurement and the motion of three-dimensional temperature field analysis
At special main furnace tubing 1 inboard prefabricated thermometric hole slot 3, for the three-dimensional thermometric of multiple spot provides possibility.Can before, during and after be respectively arranged with position, four directions, upper and lower, left and right point for measuring temperature on three xsects, go up before promptly having, preceding down, a preceding left side, the preceding right side, in go up, in down, a middle left side, the middle right side and go up the back, the back down, a left side, back, back be right, amounts to 12 measuring points.Add the standard couple measuring point that is in the stove heart, just formed a cylindrical three-dimensional thermometric network.If obtain whole real time datas, be not difficult to extrapolate this dynamic three-dimensional temperature field so.The warm field analysis of this three-dimensional will help to improve a temperature control of quality of assay furnace, or even thermocouple calibrating quality.For example, can adjust thermopair shove charge center according to three-dimensional temperature field pattern.For the double-deck furnace tubing nested structure of multisection type, 3 measuring points of minimum needs, as a preceding left side, in down and right 3 points in back.
(5) a high precision temperature control idea of multiloop heating
The present invention adopts adjustable double-layer multistage furnace tubing nested structure, means the high precision temperature station control system that must take the multiloop heating.The control system difference that this and traditional single input list are exported obviously.Adopt double-deck multistage furnace tubing nested structure, need three inputs, three output control systems at least.Though, the control structure complexity, control law need restudy, and importantly can realize changing the online adjustment mechanism that adds heat distribution, thereby even make the requirement that all can reach the national verification rules when carrying having.Because what three loops added heat control is a temperature field, so be coupled with crosslinked between each loop.Regard as simply three independently control loop be not enough, need separate lotus root and compensation problem.
Record through development test, the assay furnace of this brand new has that programming rate is fast, stabilization time short, and energy savings.The all controlled geometric center position of maximum temperature point at assay furnace, and isothermal region has had very large raising, reached the assay furnace geometric center:＞± 50 millimeter, spool central diameter: in＞35 millimeters scopes, the level of any 2 temperature deviation≤0.5 ℃ is far superior to the standard of national metrological regulation.In the very little constant temperature field in so big zone, temperature deviation, will not calibrating accuracy and work efficiency have greatly been improved because of the discrete calibrating additive error that causes of thermopair shove charge.
Claims (2)
1. a high-precision wide-temperature field electric thermo-couple test furnace comprises main furnace tubing (1), it is characterized in that: be provided with axial heating hole slot (3) in the described main furnace tubing (1), and be evenly distributed on the outside of main furnace tubing (1); Main furnace tubing (1) inboard also is provided with the thermometric hole slot (5) that three-dimensional multi-point temperature measurement is used; The outer auxilliary furnace tubing (2) that is socketed with the plurality of sections adjustable distance of main furnace tubing (1) forms double-deck multistage furnace tubing nested structure, and auxilliary furnace tubing (2) is provided with axial bottoming hole (4); The thermometric hole slot (5) that described three-dimensional multi-point temperature measurement is used be separately positioned on main furnace tubing (1) inboard before, during and after on three xsects, and position, four directions, upper and lower, left and right arranges that forming 12 measuring points constitutes a cylindrical three-dimensional thermometric network with the standard couple measuring point that is in the stove heart.
2. high-precision wide-temperature field electric thermo-couple test furnace according to claim 1 is characterized in that: described main furnace tubing (1) and the interior poling formula of auxilliary furnace tubing (2) are circled round and are arranged minor diameter helix tube type heater strip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100532708A CN101586991B (en) | 2009-06-18 | 2009-06-18 | High-precision wide-temperature field electric thermo-couple test furnace |
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| CN2009100532708A CN101586991B (en) | 2009-06-18 | 2009-06-18 | High-precision wide-temperature field electric thermo-couple test furnace |
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| CN101586991A CN101586991A (en) | 2009-11-25 |
| CN101586991B true CN101586991B (en) | 2011-07-06 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102889942B (en) * | 2012-08-14 | 2014-08-27 | 上海量值测控仪器科技有限公司 | Uniform temperature field quick detection rod of verification furnace |
| CN104502000B (en) * | 2014-12-26 | 2017-04-26 | 上海市计量测试技术研究院 | Shallow-type micro temperature calibration furnace and calibration method |
| CN104535224B (en) * | 2015-01-26 | 2017-06-30 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of pyrometer couple assay furnace calandria |
| CN106092374A (en) * | 2015-04-30 | 2016-11-09 | 洪斐喆 | Multi-point temperature element heating detection method |
| CN107290239B (en) * | 2016-04-05 | 2020-06-16 | 神华集团有限责任公司 | Reactor assembly for thermal gravimetric equipment and thermal gravimetric equipment |
| CN108686583B (en) * | 2018-07-17 | 2023-10-20 | 北京中研环科科技有限公司 | Diamond press |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2439160Y (en) * | 2000-05-31 | 2001-07-11 | 中国科学院物理研究所 | Resistor furnace tube with double-layer heating wires |
| CN2839990Y (en) * | 2005-10-31 | 2006-11-22 | 泰安磐然测控科技有限公司 | The New-type thermocouple assay furnace |
| CN201075042Y (en) * | 2007-08-09 | 2008-06-18 | 武汉钢铁(集团)公司 | Device for measuring interval temperature in stove |
-
2009
- 2009-06-18 CN CN2009100532708A patent/CN101586991B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2439160Y (en) * | 2000-05-31 | 2001-07-11 | 中国科学院物理研究所 | Resistor furnace tube with double-layer heating wires |
| CN2839990Y (en) * | 2005-10-31 | 2006-11-22 | 泰安磐然测控科技有限公司 | The New-type thermocouple assay furnace |
| CN201075042Y (en) * | 2007-08-09 | 2008-06-18 | 武汉钢铁(集团)公司 | Device for measuring interval temperature in stove |
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