CN102538462A - Experiment electric furnace with accurate temperature control - Google Patents
Experiment electric furnace with accurate temperature control Download PDFInfo
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- CN102538462A CN102538462A CN2012100116808A CN201210011680A CN102538462A CN 102538462 A CN102538462 A CN 102538462A CN 2012100116808 A CN2012100116808 A CN 2012100116808A CN 201210011680 A CN201210011680 A CN 201210011680A CN 102538462 A CN102538462 A CN 102538462A
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Abstract
The invention discloses an experiment electric furnace with accurate temperature control, which comprises a furnace body, a furnace pot, a voltage adjusting device, an external heating system and a workshop heating system, wherein the furnace pot is arranged in the furnace body, the external heating system is positioned on the outer side of the furnace pot, the workshop heating system is positioned in the furnace pot, the voltage adjusting device is used for setting and adjusting heating power of the external heating system according to the temperature of the workshop heating system, and the temperature of the external heating system is set to be lower than the set temperature of the workshop heating system. In a condition that a bath furnace has to be used for carrying out isothermal heating, cooling or heat preservation on experimental materials, the temperature fluctuation of a heating device can be reduced to the greatest extent in the process of heat preservation, the accurate control of the heating temperature and residence time in a heat field of a sample can be realized, and simultaneously an oxidation phenomenon possibly existing in the heating process of the sample can be effectively avoided.
Description
Technical field
The present invention relates to a kind of liquid furnace device of accurate temperature controlling, under the operating temperature that sets, when this device reaches stable state, the temperature fluctuation range of its operating room≤1 ℃.The formed product of the present invention can be used for requirement and accurately controls the heating of metal material under heating-up temperature, heat time heating time and the scale-free heating condition and the experimental study of aspects such as isothermal cooling, isothermal annealing and Ageing Treatment.
Background technology
In to metal material tissue, Performance Experiment, often should guarantee the scale-free heating of exemplar, again to accurately controlling heat time heating time and heating-up temperature.For this reason, require the operating room of experimental electric furnace to be in open state,, promptly realize the accurate control of heat time heating time so that putting into rapidly and taking out of exemplar guarantees the setting requirement of satisfied test of the time of staying of sample in thermal field.But under the operating room was in opened state, the heat radiation of fire door was bigger, if still adopt traditional external heat, the temperature fluctuation range of operating room is big, is difficult to satisfy some experiment heating-up temperature is accurately controlled requirement.Existing heating in vacuum device and atmosphere protection heater; Though can satisfy the requirement of high temperature-controlled precision; But sample can only heat up with stove and heat, and has only when furnace temperature is reduced to a certain temperature, and sample just can take out from heater; In control to heat time heating time; The requirement of experiment of aspects such as isothermal annealing, isothermal tempering, isothermal cooling, Ageing Treatment be can't strict satisfy,, experiment desired isothermal heat time heating time or temperature retention time are converted into very difficult heat time heating time this process because the heating-cooling process temperature is a continually varying.
The metal material heat treatment technics is a key technology indispensable in the modern manufacturing industry, and the future thrust in prior heat treatment field is the accurate thermal processing, because this not only is related to the quality of product, also is related to energy-conservation and raising production efficiency.Accurate heat treated technology establishment and application be unable to do without accurate heat treated experimental data and experimental provision, and the accurate temperature controlling experimental electric furnace is invented under the background of accurate thermal processing requirement of experiment.
Summary of the invention
The present invention is in order to use liquid furnace experiment material to be carried out under the condition of isothermal heating, cooling or insulation; Reduce the temperature fluctuation of heater in insulating process to greatest extent; Realization is effectively avoided the oxidative phenomena that sample possibly occur in the heating process simultaneously to sample heating-up temperature and the accurate control of the time of staying in thermal field thereof.
A kind of accurate temperature controlling experimental electric furnace; Comprise body of heater, retort, pressure regulator, external heat system and operating room's heating system; Retort is positioned at body of heater inside; The external heat system is positioned at the retort outside, and operating room's heating system is positioned at retort, and pressure regulator is set the heating power of adjustment external heat system according to the temperature of operating room's heating system; It is low that the temperature of external heat system is set the temperature that sets than operating room heating system.
Described accurate temperature controlling experimental electric furnace, the temperature of said external heat system are set low 10 ℃-20 ℃ of the temperature that sets than operating room heating system.
Described accurate temperature controlling experimental electric furnace, said body of heater ecto-entad comprise furnace shell (3), heating wire supporter (7), refractory fibre (8), and body of heater top and bottom of furnace body are the light-weight refractory section bar near heating wire supporter (7).
Described accurate temperature controlling experimental electric furnace, said external heat system comprises heating wire (4), heating wire supporter (7), body of heater thermocouple (9), heating wire binding post (11) and the body of heater temperature control system that is arranged in body of heater; Heating wire (4) is fixed on heating wire supporter (7) and upward and with heating wire binding post (11) is connected, and heating wire binding post (11) is connected with body of heater thermocouple (9) the corresponding interface with body of heater temperature control system meta formula humidostat; The working end of body of heater thermocouple (9) places in the aperture of the heating wire supporter (7) between the heating wire (4).
Described accurate temperature controlling experimental electric furnace, said retort comprise tank body (6), liquid heat medium (5), the liquid heat medium (5) of the interior splendid attire of tank body (6); Tank body (6) can be a metal material, also can be ceramic material; Liquid heat medium (5) can be mineral oil, salt bath, alkaline bath or low-melting-point metal.
Described accurate temperature controlling experimental electric furnace, said operating room heating system comprise operating room's thermocouple (12), built-in heater (1), liquid heat medium (5) and operating room's temperature control system; Built-in heater (1) is made up of metal-coating (101), ceramic electric heating insulating materials (102) and heating wire (103), and built-in heater can do spirality or dish type places tank body (6) bottom; The working end of operating room's thermocouple (12) is near the position at sample place; Operating room's thermocouple (12) and built-in heater (1) are connected with the corresponding interface of PID humidostat in operating room's temperature control system, and when arriving design temperature, the temperature fluctuation range of operating room is stabilized in-1～0 ℃.
Effect of the present invention is:
1,, changes in two temperature, two control, the built-in heating system of the inside and outside heating respectively of tank body with temperature control with crucible type liquid furnace traditional, that pass through the outer heating of tank body.
2, the crucible type liquid furnace is used in test traditional, the single heating source; In no matter temperature sensor being placed jar or jar outside; When the temperature of (operating room) in the tank body reaches design temperature, because the temperature of jar outer heating element heater and refractory material is far above the temperature of operating room, even temperature controller power cutoff immediately; Because the thermal inertia that huge accumulation of heat brought of jar outer heating element heater and refractory material can make the temperature of operating room continue up; Otherwise when the temperature of operating room was reduced to design temperature, even temperature controller demand working power supply, because the heat that heating element heater produced has little time to replenish the continuation heat radiation of fire door and body of heater, the temperature of operating room can continue inertia and descend.Therefore, the crucible type liquid furnace in single heating source in use exists very big temperature fluctuation, and when environment temperature is low with operating temperature when higher, this fluctuation is particularly evident.
3, change crucible type liquid furnace after two temperature, two control, the built-in heating system into; All the time be lower than jar temperature of interior (operating room) owing to can set the temperature of retort external heat source; Therefore; The jar heat that external heat source produced is mainly used in the heat radiation that replenishes body of heater, and its effect has been equivalent to both guarantee the constant of retort external temperature, has avoided external heat source in jar, to carry heat energy again; And be in the built-in heater of retort inner bottom part, and the one, the liquid medium of operating room is directly heated, the 2nd, its quality is much smaller than the quality of tank body and heat medium, and the reason of this two aspect reduces the thermal inertia of system greatly; In addition, the PID temperature controller is adopted in the temperature control in the tank body, has guaranteed the minimum fluctuation of operating temperature of heating clamber, thereby realizes the accurate control to furnace temperature.
4, because the temperature of the outer heating of retort system is set all the time the temperature a little less than the operating room, so jar outer heating system can not exert an influence to the temperature fluctuation of operating room 10 ℃ of thermal inertias of being brought with interior variations in temperature.Therefore, the temperature control of body of heater (outside jar) heating system selects for use a cheap pressure regulator and a position formula temperature controller to be used, and can meet the demands.
Description of drawings
Fig. 1 is the furnace binding sketch map of the embodiment of the invention.
Fig. 2 is the built-in heater sketch map of the embodiment of the invention.
Fig. 3 is the A-A profile of Fig. 2.
Fig. 4 is the electric control theory figure of the embodiment of the invention.(a) body of heater temperature-controlling system; (b) operating room's temperature-controlling system.
1. built-in heater, 2. light-weight refractory section bar, 3. furnace shell, 4. heating wire, 5. liquid heat medium, 6. tank body, 7. heating wire supporter, 8. refractory fibre, 9. body of heater thermocouple, 10. light-weight refractory section bar, 11. heating wire binding posts, 12. operating room's thermocouples.
The specific embodiment
Below in conjunction with specific embodiment, the present invention is elaborated.
Furnace binding sketch map with reference to figure 1 accurate temperature controlling experimental electric furnace of the present invention; Comprise body of heater, retort, pressure regulator, external heat system and operating room's heating system; Retort is positioned at body of heater inside; The external heat system is positioned at the retort outside, and operating room's heating system is positioned at retort, and pressure regulator can be set the heating power of adjusting the external heat system according to the temperature of operating room's heating system; In general, the setting of the temperature of external heat system is hanged down 10 ℃～20 ℃ than the temperature that operating room heating system sets.
The body of heater ecto-entad comprises furnace shell 3, heating wire supporter 7, refractory fibre 8, and body of heater top and bottom of furnace body are the light-weight refractory section bar near heating wire supporter 7.
The external heat system comprises heating wire 4, heating wire supporter 7, body of heater thermocouple 9, heating wire binding post 11 and the body of heater temperature control system that is arranged in body of heater, and (Fig. 4 a).Heating wire 4 is fixed on the heating wire supporter 7 and with heating wire binding post 11 and is connected, heating wire binding post 11 and body of heater thermocouple 9 and body of heater temperature control system (among Fig. 4 a) the corresponding interface of meta formula humidostat be connected; For further improving the observing and controlling temperature precision to body of heater, the working end of body of heater thermocouple 9 should place the aperture interior (as shown in Figure 1) of the heating wire supporter 7 between the heating wire 4.When accurate temperature controlling experimental electric furnace operate as normal, the temperature of external heat system is set the temperature that sets than operating room in the retort all the time and is hanged down 10 ℃～20 ℃.Like this, the external heat system had both satisfied the required compensation requirement of body of heater heat radiation, had avoided the fluctuation of the interior operating room of the retort that thermal inertia the caused temperature of external heat system again.Pressure regulator in the body of heater temperature control system is in order to set the heating power of adjusting the external heat system according to the temperature of operating room in the retort.When the design temperature of the liquid heat medium 5 in operating room was higher, the design temperature of external heat system also must correspondingly improve, and the required heating power of external heat system just requires to increase; Otherwise when the required design temperature in operating room was low, the design temperature of external heat system also must correspondingly reduce, and the required heating power of outer thermal source will correspondingly reduce, and this coupling requires effectively to reduce the temperature fluctuation of external heat system.Therefore, can set the heating power of adjusting the external heat system according to the different temperatures of operating room, and being used of pressure regulator and position formula humidostat can guarantee effectively that the temperature of the body of heater thermal treatment zone is more lower slightly than the temperature of operating room all the time through pressure regulator.
Retort comprises tank body 6, liquid heat medium 5, the liquid heat medium 5 of splendid attire in the tank body 6.Tank body 6 can be metal materials such as heat resisting steel, also can be ceramic materials such as aluminium oxide; Liquid heat medium 5 can be mineral oil, salt bath, alkaline bath or low-melting-point metal; When carrying out heat run, sample hangs in the heat medium 5 of operating room.
Operating room's heating system comprises operating room's thermocouple 12, built-in heater 1, liquid heat medium 5 and operating room's temperature control system (b among Fig. 4).The structure of built-in heater 1 is as shown in Figure 2, partly is made up of metal-coating 101, ceramic electric heating insulating materials 102 and heating wire 103 etc., and built-in heater can do spirality or dish type places tank body 6 bottoms.For guaranteeing the observing and controlling precision to experimental temperature, the working end of operating room's thermocouple 12 should be near the position at sample place as far as possible.Operating room's thermocouple 12 and built-in heater 1 are connected with the corresponding interface of PID humidostat in operating room's temperature control system (b among Fig. 4).
The accurate temperature controlling experimental electric furnace is when reaching design temperature and being in stable state; The temperature fluctuation range of operating room can for a long time, accurately be controlled in-1～0 ℃ of design temperature; Its main cause have following some: 1, after the heat medium in the operating room 5 reaches design temperature and gets into stable state; The heat that built-in heater 1 produces is mainly used in the heat radiation of compensation fire door, and the dissipated power during operate as normal is little and relatively stable, and therefore built-in heater 1 has smaller volume and size; 2, because the quality of built-in heater 1 is merely 1/10～1/20 of heat medium 5 and tank body 6 quality compares with external mode of heating, thermal inertia is minimum; 3, built-in heater 1 is in the bottom of liquid heat medium 5; When operating temperature is low; The heat exchange of built-in heater 1 and liquid heat medium 5 mainly realizes through direct conduction and convection current; When operating temperature was higher, radiation, conduction and three kinds of heat exchange methods of convection current existed simultaneously, and the hysteresis effect of heat exchanging process is little; 4, use the good ceramic electric heating insulating materials 102 of heat conductivility in the built-in heater 1, effectively reduce the internal-external temperature difference of built-in heater 1, reduced the thermal inertia of built-in heater 1 self; 5, operating room's thermocouple 12 directly contacts with liquid heat medium 5, and the variations in temperature of operating room is swift in response, and has reduced the hysteresis effect of operating room's thermocouple 12 in temperature perception link; 6, adopt the PID humidostat, realized the intellectuality of temperature control and regulation.
Should be understood that, concerning those of ordinary skills, can improve or conversion, and all these improvement and conversion all should belong to the protection domain of accompanying claims of the present invention according to above-mentioned explanation.
Claims (6)
1. accurate temperature controlling experimental electric furnace; It is characterized in that; Comprise body of heater, retort, pressure regulator, external heat system and operating room's heating system, retort is positioned at body of heater inside, and the external heat system is positioned at the retort outside; Operating room's heating system is positioned at retort, and pressure regulator is set the heating power of adjustment external heat system according to the temperature of operating room's heating system; It is low that the temperature of external heat system is set the temperature that sets than operating room heating system.
2. accurate temperature controlling experimental electric furnace according to claim 1 is characterized in that, the temperature of said external heat system is set low 10 ℃-20 ℃ of the temperature that sets than operating room heating system.
3. accurate temperature controlling experimental electric furnace according to claim 1; It is characterized in that; Said body of heater ecto-entad comprises furnace shell (3), heating wire supporter (7), refractory fibre (8), and body of heater top and bottom of furnace body are the light-weight refractory section bar near heating wire supporter (7).
4. accurate temperature controlling experimental electric furnace according to claim 3 is characterized in that, said external heat system comprises heating wire (4), heating wire supporter (7), body of heater thermocouple (9), heating wire binding post (11) and the body of heater temperature control system that is arranged in body of heater; Heating wire (4) is fixed on heating wire supporter (7) and upward and with heating wire binding post (11) is connected, and heating wire binding post (11) is connected with body of heater thermocouple (9) the corresponding interface with body of heater temperature control system meta formula humidostat; The working end of body of heater thermocouple (9) places in the aperture of the heating wire supporter (7) between the heating wire (4).
5. accurate temperature controlling experimental electric furnace according to claim 1 is characterized in that, said retort comprises tank body (6), liquid heat medium (5), the liquid heat medium (5) of the interior splendid attire of tank body (6); Tank body (6) can be a metal material, also can be ceramic material; Liquid heat medium (5) can be mineral oil, salt bath, alkaline bath or low-melting-point metal.
6. accurate temperature controlling experimental electric furnace according to claim 5 is characterized in that, said operating room heating system comprises operating room's thermocouple (12), built-in heater (1), liquid heat medium (5) and operating room's temperature control system; Built-in heater (1) is made up of metal-coating (101), ceramic electric heating insulating materials (102) and heating wire (103), and built-in heater can do spirality or dish type places tank body (6) bottom; The working end of operating room's thermocouple (12) is near the position at sample place; Operating room's thermocouple (12) and built-in heater (1) are connected with the corresponding interface of PID humidostat in operating room's temperature control system, and when arriving design temperature, the temperature fluctuation range of operating room is stabilized in-1～0 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210011680.8A CN102538462B (en) | 2012-01-16 | 2012-01-16 | Experiment electric furnace with accurate temperature control |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210011680.8A CN102538462B (en) | 2012-01-16 | 2012-01-16 | Experiment electric furnace with accurate temperature control |
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| Publication Number | Publication Date |
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| CN102538462A true CN102538462A (en) | 2012-07-04 |
| CN102538462B CN102538462B (en) | 2014-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210011680.8A Expired - Fee Related CN102538462B (en) | 2012-01-16 | 2012-01-16 | Experiment electric furnace with accurate temperature control |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940231A (en) * | 2013-01-21 | 2014-07-23 | 洛阳华旭利尔电炉有限公司 | High-temperature crucible experiment furnace |
| CN107267729A (en) * | 2017-05-04 | 2017-10-20 | 北京中科科美科技股份有限公司 | A kind of multistation vacuum drying oven is uniformly heated and temperature control system |
| CN108035707A (en) * | 2017-11-15 | 2018-05-15 | 中国石油天然气股份有限公司 | Dangerous temperature monitoring method before a kind of combustion in situ igniting |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3422333C2 (en) * | 1984-06-15 | 1986-04-24 | Seico Industrie-Elektrowärme GmbH, 3012 Langenhagen | Insulated heating chamber, especially high-temperature systems |
| CN1065926A (en) * | 1992-05-15 | 1992-11-04 | 冶金工业部钢铁研究总院 | Ultra-high temp electric furnace |
| JPH0854187A (en) * | 1994-08-10 | 1996-02-27 | Sekisui Chem Co Ltd | Electric furnace |
-
2012
- 2012-01-16 CN CN201210011680.8A patent/CN102538462B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3422333C2 (en) * | 1984-06-15 | 1986-04-24 | Seico Industrie-Elektrowärme GmbH, 3012 Langenhagen | Insulated heating chamber, especially high-temperature systems |
| CN1065926A (en) * | 1992-05-15 | 1992-11-04 | 冶金工业部钢铁研究总院 | Ultra-high temp electric furnace |
| JPH0854187A (en) * | 1994-08-10 | 1996-02-27 | Sekisui Chem Co Ltd | Electric furnace |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940231A (en) * | 2013-01-21 | 2014-07-23 | 洛阳华旭利尔电炉有限公司 | High-temperature crucible experiment furnace |
| CN107267729A (en) * | 2017-05-04 | 2017-10-20 | 北京中科科美科技股份有限公司 | A kind of multistation vacuum drying oven is uniformly heated and temperature control system |
| CN108035707A (en) * | 2017-11-15 | 2018-05-15 | 中国石油天然气股份有限公司 | Dangerous temperature monitoring method before a kind of combustion in situ igniting |
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| CN102538462B (en) | 2014-06-04 |
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