CN102607270A - Vacuum variable-temperature tube furnace - Google Patents
Vacuum variable-temperature tube furnace Download PDFInfo
- Publication number
- CN102607270A CN102607270A CN2012100461916A CN201210046191A CN102607270A CN 102607270 A CN102607270 A CN 102607270A CN 2012100461916 A CN2012100461916 A CN 2012100461916A CN 201210046191 A CN201210046191 A CN 201210046191A CN 102607270 A CN102607270 A CN 102607270A
- Authority
- CN
- China
- Prior art keywords
- glass tube
- temperature
- tube
- layer glass
- vacuum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011521 glass Substances 0.000 claims abstract description 61
- 238000005485 electric heating Methods 0.000 claims abstract description 12
- 239000000919 ceramic Substances 0.000 claims description 5
- 239000012528 membrane Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 3
- 238000007669 thermal treatment Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 27
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 abstract description 9
- 238000009413 insulation Methods 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 abstract 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 238000012360 testing method Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 230000009191 jumping Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 235000011089 carbon dioxide Nutrition 0.000 description 2
- 238000007571 dilatometry Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000007115 recruitment Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Landscapes
- Resistance Heating (AREA)
Abstract
The invention discloses a vacuum variable-temperature tube furnace, which comprises an inner glass tube and an outer glass tube. The inner glass tube and the outer glass tube form a hollow sealed cylindrical tube. A vacuum layer is reserved between the inner glass tube and the outer glass tube. An electric heating layer is coated to the outside of the inner glass tube. Electrode connecting wires penetrating through the outer glass tube are led out from two ends of the electric heating layer. A hollow area inside the inner glass tube is a heating area. The vacuum variable-temperature tube furnace is provided with the inner glass tube and the outer glass tube, the vacuum thermal-insulation layer is arranged between the inner glass tube and the outer glass tube, and accordingly samples are continuously variable in temperature and available for continuous measurement, and abrupt change of linear expansion can be conveniently observed through the transparent glass tubes. The electric heating material is coated to the inner glass tube instead of an existing resistance wire, so that the temperature field of a linear expansion coefficient measurer is even and stable, the range of obtained temperature is wide, power is only tens of watts, stability is higher, and measurement results are low in error and high in precision.
Description
Technical field
The present invention relates to a kind of tube furnace, relate in particular to a kind of vacuum alternating temperature tube furnace.
Background technology
Linear expansion coefficient is also referred to as the linear elasticity coefficient sometimes, refers to the percentage that 1 ℃ of length of material of the every variation of temperature changes.Most materials have the characteristic of " expanding with heat and contract with cold ", and this aggravates or weaken and cause owing to the warm-up movement of material interior molecules.This attributes in machinery and the manufacturing of instrument, in the processing of material, in welding, all should be taken into account in the design of engineering structure, otherwise, with the precision that influences stability of structure and instrument.The line of material expands when being the material expanded by heating, the elongation on the one dimension direction.Linear expansion coefficient is an important indicator of the selection of material.Particularly develop new material, bound will mensuration to the material linear expansion coefficient.Type wire expansion coefficient measuring instrument is a kind of direct-reading analyzer to the solid wires coefficient of expansion; In R&D and production, in the Lab of General Physics of the universities and colleges teaching, can make quantitative examination to the characteristic of expanding with heat and contract with cold of material; And can do accurate measurement to the linear expansion coefficient of metal such as iron, copper, aluminium bar and other solid matter and calculate; The factors of analyzing influence certainty of measurement are observed some alloy material near metallographic structure changes temperature, the jumping phenomenon of line swell increment occurs.Measure linear expansion coefficient, key is measured as the little long amount of measure solid in a certain temperature range, measures with light lever method and two kinds of methods of spiral micrometer method usually, and the accuracy key of its experimental data is the uniformity and the stability of Temperature Field Measurement.At present; Aspect the line dilatometry of stock; Cold and hot two constant temperature baths of the general employing of temperature control of alternating temperature tube furnace; The temperature of cold constant temperature bath is between-32 ℃～-28 ℃, and the temperature of hot constant temperature bath need keep the temperature-resistant of cold and hot two constant temperature baths when measuring between+28 ℃～+ 32 ℃.When measuring the material coefficient of expansion, at first determined material is put into cold constant temperature bath, about 5～10 minutes; Material begins to measure its shrinkage front length after shrinking and stablizing, and then material is put into hot constant temperature bath; About 5～10 minutes, treat material expand stable after, begin to measure its shrinkage front length.This process need repeats once, brings contracted length and the expansion length measured into general formula then, calculates the linear expansion coefficient of this material.The complex operation of this line dilatometer need move around measured matter in hot-cool environment, the error that causes is big; Testing efficiency is low, is easy to influence the judgement of operator's accuracy, causes the failure of an experiment; Even Success in Experiment, its experimental precision often can be not high yet.The variations in temperature that thermostatic control during test is often demonstrated according to protractor by the operator in time in pre-cooled groove methyl alcohol add dry ice and realize; Operation inconvenience on the one hand; On the other hand in the laboratory with a large amount of methyl alcohol and dry ice, methyl alcohol is taken out of with great amount of carbon dioxide, influences health.In addition, in measurement, keep cold temperature bathe with the heat temperature bathe constant in the technology operation difficulty very big, to measure the temperature range ten minutes limited at every turn.
Therefore, though the existing temperature range that adopts the resistance wire heating to obtain is wide, easy alternating temperature, power consumption is big, and the uniform and stable property in temperature field is poor.Though adopt the uniform and stable property in cold and hot two constant temperature bath temperature fields good; But has following defective again: 1) only can be for cold and hot two constant temperature baths; The temperature that is cold constant temperature bath is between-32 ℃～-28 ℃, and the temperature of hot constant temperature bath is done the linear expansion coefficient determining of constant temperature with respect to the former temperature of sample (being generally room temperature) two temperature ranges of+28 ℃～+ 32 ℃; 2) can't alternating temperature, jumping phenomenon that more can't the observation line swell increment.3) complex equipments is and huge, and its valency is high.Therefore; Uniform and stable for the temperature field of the alternating temperature tube furnace that makes type wire expansion coefficient measuring instrument, the temperature range of acquisition is wide, and the measurement result precision is high; Take into account the advantage of resistance wire heating and constant temperature bath heating, be necessary the alternating temperature tube furnace of existing type wire expansion coefficient measuring instrument is improved.
Summary of the invention
Technical problem to be solved by this invention provides a kind of vacuum alternating temperature tube furnace, makes the temperature field of type wire expansion coefficient measuring instrument uniform and stable, and the temperature range of acquisition is wide, and the little precision of measuring result error is high.
The present invention solves the problems of the technologies described above the technical scheme that adopts to provide a kind of vacuum alternating temperature tube furnace; Comprise inner layer glass tube and outer layer glass tube; The said inner layer glass tube and the glass outer seal of tube form the cylindrical pipe of hollow, are vacuum layer between said inner layer glass tube and the outer layer glass tube, and said inner layer glass tube is externally coated with electric heating layer; Said electric heating layer two ends lead to the electrode connecting line that runs through outer layer glass tube, and said inner layer glass tube interior hollow region is the thermal treatment zone.
Above-mentioned vacuum alternating temperature tube furnace, wherein, said electric heating layer is the PTC ceramic membrane.
Above-mentioned vacuum alternating temperature tube furnace, wherein, said outer layer glass tube outside is coated with the reflection silverskin.
The present invention contrasts prior art has following beneficial effect: vacuum alternating temperature tube furnace provided by the invention; Through adopting inside and outside layer glass pipe mechanism to be provided with; Between inside and outside is vacuum heat-insulating layer; Make sample alternating temperature continuously, the jumping phenomenon of observation line swell increment is convenient in continuous measurement through transparent glass tube; Inner layer glass tube applies the electrical heating material and replaces existing resistance wire, thereby makes the temperature field of type wire expansion coefficient measuring instrument uniform and stable, and the temperature range of acquisition is wide, and power has only tens watts, and stability is better, and the little precision of measuring result error is high.
Description of drawings
Fig. 1 is a vacuum alternating temperature tube furnace cross-sectional view of the present invention;
Fig. 2 is a vacuum alternating temperature tube furnace section structure sketch map of the present invention.
Among the figure:
1 inner layer glass tube, 2 outer layer glass tubes, 3 vacuum layer
4PCT ceramic membrane 5 reflection silverskin 6 connecting lines
7 thermals treatment zone
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further description.
Fig. 1 is a vacuum alternating temperature tube furnace cross-sectional view of the present invention, and Fig. 2 is a vacuum alternating temperature tube furnace section structure sketch map of the present invention.
See also Fig. 1 and Fig. 2; Vacuum alternating temperature tube furnace inner layer glass tube 1 provided by the invention and outer layer glass tube 2; The cylindrical pipe of inner layer glass tube 1 and outer layer glass tube 2 sealing formation hollows is a vacuum layer 3 between inner layer glass tube 1 and the outer layer glass tube 2, and said inner layer glass tube 1 is externally coated with electric heating layer; Said electric heating layer two ends lead to the electrode connecting line 6 that runs through outer layer glass tube 2, and said inner layer glass tube 1 interior hollow region is the thermal treatment zone 7.
Above-mentioned vacuum alternating temperature tube furnace is inside and outside two layers of mechanism, and inner layer glass tube 1 is an electric heating layer, and outer layer glass tube 2 has the function of mechanism supports, is vacuum layer 3 between ectonexine.Electrical heating material on the inner layer glass tube 1 is a PCT ceramic membrane material 4 owing to adopt glass tube radially, axially symmetric space applies, its heat energy effect according to geometric space everywhere symmetrically and evenly, thereby the temperature field of guaranteeing tube furnace is even.Middle level between the ectonexine is designed for vacuum heat-insulating layer, to reduce the heat conduction, ensures the temperature stabilization of humidity province in the pipe.Be coated with reflection silverskin 5 on the outer layer glass tube 2,, thereby can further improve the temperature stabilization performance of managing interior warm area with the reduction heat radiation.
In the type wire expansion coefficient measuring instrument test, opening power heats up inner layer glass tube 1 through connecting line 6 heating PCT ceramic membranes (Positive Temperature Coefficient, positive temperature coefficient) 4.When being heated to temperature to be measured, test substance is put into inner glass tube 1.At present; The linear expansion coefficient determining method that extensively adopts is the differential method; Object under test was put into inner glass tube 1 to 5～10 minute; Measure the recruitment of object under test length after temperature raises, under the situation of known object under test original length, then can measure the linear expansion coefficient of this material according to formula.At present; Aspect the line dilatometry of stock; Cold and hot two constant temperature baths of the general employing of temperature control of alternating temperature tube furnace; The temperature of cold constant temperature bath is between-32 ℃～-28 ℃, and the temperature of hot constant temperature bath need keep the temperature-resistant of cold and hot two constant temperature baths when measuring between+28 ℃～+ 32 ℃.When measuring the material coefficient of expansion, at first determined material is put into cold constant temperature bath, about 5～10 minutes; Material begins to measure its shrinkage front length after shrinking and stablizing, and then material is put into hot constant temperature bath; About 5～10 minutes, treat material expand stable after, begin to measure its shrinkage front length.Vacuum alternating temperature tubular type furnace temperature of the present invention field is uniform and stable, can in the temperature range of room temperature to 350 ℃, obtain homogeneous temperature field in the alternating temperature tube furnace center line sample expanded zone, and uniform temperature field is 100mm; Reach radially less than ± 0.2 ℃/10mm; Axially less than ± 0.06 ℃/10mm; Temperature fluctuation is less than ± 0.05 ℃/60mins.The pertinent instruments that significantly surpasses domestic and international all kinds of market sales at present.
In sum, vacuum alternating temperature tube furnace provided by the invention is through adopting inner layer glass tube 1 and outer layer glass tube 2 two-layer sealing settings; Between inside and outside is vacuum layer 3; Make sample alternating temperature continuously, the jumping phenomenon of observation line swell increment is convenient in continuous measurement through transparent glass tube; Inner layer glass tube applies the electrical heating material and replaces existing resistance wire, thereby makes the temperature field of type wire expansion coefficient measuring instrument uniform and stable, and the temperature range of acquisition is wide, and power has only tens watts, and stability is better, and the little precision of measuring result error is high.
Though the present invention discloses as above with preferred embodiment; Right its is not that any those skilled in the art are not breaking away from the spirit and scope of the present invention in order to qualification the present invention; When can doing a little modification and perfect, so protection scope of the present invention is when being as the criterion with what claims defined.
Claims (3)
1. vacuum alternating temperature tube furnace; It is characterized in that: comprise inner layer glass tube (1) and outer layer glass tube (2); Said inner layer glass tube (1) and outer layer glass tube (2) sealing form the cylindrical pipe of hollow; Be vacuum layer (3) between said inner layer glass tube (1) and the outer layer glass tube (2); Said inner layer glass tube (1) is externally coated with electric heating layer, and said electric heating layer two ends lead to the electrode connecting line (6) that runs through outer layer glass tube (2), and said inner layer glass tube (1) interior hollow region is the thermal treatment zone (7).
2. vacuum alternating temperature tube furnace according to claim 1 is characterized in that: said electric heating layer is PTC ceramic membrane (4).
3. vacuum alternating temperature tube furnace according to claim 1 and 2 is characterized in that: said outer layer glass tube (2) outside is coated with reflection silverskin (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100461916A CN102607270A (en) | 2012-02-27 | 2012-02-27 | Vacuum variable-temperature tube furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100461916A CN102607270A (en) | 2012-02-27 | 2012-02-27 | Vacuum variable-temperature tube furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102607270A true CN102607270A (en) | 2012-07-25 |
Family
ID=46524884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100461916A Pending CN102607270A (en) | 2012-02-27 | 2012-02-27 | Vacuum variable-temperature tube furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102607270A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631376A (en) * | 2018-06-21 | 2019-12-31 | 中国科学院地质与地球物理研究所兰州油气资源研究中心 | Miniature double-vacuum furnace tube and use method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3626154A (en) * | 1970-02-05 | 1971-12-07 | Massachusetts Inst Technology | Transparent furnace |
| US6176924B1 (en) * | 1998-09-21 | 2001-01-23 | The University Of Akron And Nasa | Transparent multi-zone crystal growth furnace and method for controlling the same |
| CN202485433U (en) * | 2012-02-27 | 2012-10-10 | 上海实博实业有限公司 | Vacuum variable-temperature tubular furnace |
-
2012
- 2012-02-27 CN CN2012100461916A patent/CN102607270A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3626154A (en) * | 1970-02-05 | 1971-12-07 | Massachusetts Inst Technology | Transparent furnace |
| US6176924B1 (en) * | 1998-09-21 | 2001-01-23 | The University Of Akron And Nasa | Transparent multi-zone crystal growth furnace and method for controlling the same |
| CN202485433U (en) * | 2012-02-27 | 2012-10-10 | 上海实博实业有限公司 | Vacuum variable-temperature tubular furnace |
Non-Patent Citations (4)
| Title |
|---|
| 徐栋等: "陶瓷电热材料的研究与应用", 《山东陶瓷》, vol. 30, no. 3, 30 June 2007 (2007-06-30), pages 28 - 31 * |
| 江元杪: "表面型PTC加热器热阻的研究和应用", 《钦州学院学报》, vol. 22, no. 3, 30 June 2007 (2007-06-30), pages 81 - 84 * |
| 王景义等: "透明炉简介", 《微细加工技术》, no. 3, 31 March 1992 (1992-03-31), pages 75 - 79 * |
| 那威等: "钢外护管真空复合预制直埋管道真空层热力分析", 《暖通空调》, vol. 36, no. 2, 31 December 2006 (2006-12-31), pages 1 - 5 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110631376A (en) * | 2018-06-21 | 2019-12-31 | 中国科学院地质与地球物理研究所兰州油气资源研究中心 | Miniature double-vacuum furnace tube and use method thereof |
| CN110631376B (en) * | 2018-06-21 | 2023-12-22 | 中国科学院西北生态环境资源研究院 | Miniature double-vacuum furnace tube and use method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102798645B (en) | Heat conduction coefficient and contact thermal resistance testing device | |
| CN101113963B (en) | Method and device for measuring liquid thermal conductivity factor | |
| CN104614399B (en) | A kind of hot physical property transient hot wire technique temperature probe of liquid | |
| CN102072916A (en) | Method and device for measuring total hemispherical emissivity of non-metallic material | |
| Watanabe | Further examination of the transient hot-wire method for the simultaneous measurement of thermal conductivity and thermal diffusivity | |
| CN106153672A (en) | Voluminous powder material thermal conductivity measurement apparatus based on one-dimensional heat conduction principle and method | |
| CN102539472A (en) | Method for measuring heat conductivity of poor conductor by using steady-state comparison | |
| CN202485433U (en) | Vacuum variable-temperature tubular furnace | |
| CN102778475B (en) | Method for measuring solid-solid thermal contact resistance via up-and-down constant temperature parameter identification method | |
| Belyaev et al. | The design of a measuring instrument for determining the diffusion coefficient of solvents in thin articles made of capillary-porous materials | |
| CN103713013B (en) | Test tubulose material shaft is to the device of coefficient of heat conductivity | |
| CN102607270A (en) | Vacuum variable-temperature tube furnace | |
| Babu et al. | Measurement of thermal conductivity of fluid using single and dual wire transient techniques | |
| RU2419782C2 (en) | Method of determining temperature dependence of heat conductivity factor of solid, isotropic electrically conducting materials | |
| CN204027490U (en) | A kind of experimental provision that carrys out slotted line expansion coefficient with clock gauge | |
| CN103257154B (en) | Method for measuring hemispherical total emissivity and heat conductivity of large temperature difference sample | |
| Pilkington et al. | Thermal conductivity probe length to radius ratio problem when measuring building insulation materials | |
| CN114428051A (en) | Dew point corrosion assessment device with controllable condensation temperature | |
| Kadjo et al. | A new transient two-wire method for measuring the thermal diffusivity of electrically conducting and highly corrosive liquids using small samples | |
| Moroe et al. | Thermal conductivity measurement of gases by the transient short-hot-wire method | |
| Hedayati-Dezfooli et al. | A design of experimental apparatus for studying coupled heat and moisture transfer in soils at high-temperature conditions | |
| CN202994698U (en) | Heat conductivity measuring probe | |
| Bouyer et al. | Design of a new device for fibers strand axial thermal conductivity measurement | |
| Kawaguchi et al. | Temperature measurement of molten glass under batch feeding process by means of electrical resistance tomography | |
| Zheng et al. | The determination of isobaric heat capacities of liquid by the new flow calorimeter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20120725 |