CN87102657A - Industrial frequency electric resistance induction furnace - Google Patents
Industrial frequency electric resistance induction furnace Download PDFInfo
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- CN87102657A CN87102657A CN 87102657 CN87102657A CN87102657A CN 87102657 A CN87102657 A CN 87102657A CN 87102657 CN87102657 CN 87102657 CN 87102657 A CN87102657 A CN 87102657A CN 87102657 A CN87102657 A CN 87102657A
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- heat
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- induction coil
- induction furnace
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Abstract
The present invention is the inductive reactance heater.Mainly be applicable to the melting of metal and alloy thereof.Principal character is to replace copper tube to make induction coil with solid heat-resisting alloy wire rod.This coil is both as heater, again as the induction coil that produces vortex induction heat.Removed the cooling water system of induction coil.The heat one of melting furnace charge is to derive from the vortex induction heat that induction coil produces in the crucible, the 2nd, derive from induction coil as resistance heat that heater produced.This stove effective power height, it is low to consume energy, and compares with existing power frequency induction furnace, when smelting metal and alloy, can economize on electricity 40%.
Description
The invention belongs to induction heating apparatus.Mainly be applicable to the melting of metal and alloy thereof.
The history that is used for the existing last 100 years of power frequency induction furnace of smelting metal and alloy, extensive use at home and abroad, domestic have several ten thousand to be distributed in each industrial department use.
What Britain John Wei Si and Peter Simpson were outstanding " has introduced line-frequency induction heating and device thereof in eddy-current heating handbook one book (National Defense Industry Press published in 1985).Fig. 1 is the schematic diagram of existing power frequency induction furnace.1 is crucible among the figure, and 2 is heat-insulation layer, and 3 is the induction coil of making of copper tube, and 4 is iron core.Its operation principle is when passing to industrial-frequency alternating current in the induction coil 3, produces the line-frequency induction eddy current in crucible 1, with the furnace charge heat fused.Copper tube coil domestic demand water flowing cooling prevents its fusing.The thermal source of copper tube heating is from two aspects; The one, because the resistance heat that the resistance of itself produces (being commonly called as the copper loss heating); The 2nd, the crucible body of the high temperature of sensed heating is by heat-insulation layer, with a part of heat transferred induction coil copper tube.For this reason, the thickness of heat-insulation layer is exactly the problem of a contradiction: heat-insulation layer is blocked up, and then leakage field is big, and air-gap is big, and induced electricity efficient is low excessively; Heat-insulation layer is thin excessively, then is incubated badly, and the heat that is passed to copper tube by crucible is also big, and promptly heat loss is big, and the thermal efficiency is low.
Find out that by above-mentioned there is following shortcoming in existing power frequency induction furnace:
1. waste energy.Because the cooling water in the copper tube is taken away a large amount of heats, causes effective power low.As the molten aluminium stove of the line-frequency induction of 250 kilograms of nominals, power is 85KW, and average smelting time needs 3 hours, and one ton of aluminium of every melting needs 800 kilowatt-hours of power consumptions.
2. in the fusion process, because strong excessively electromagnetic agitation causes liquid level seething of mushroom head to occur, a part of metal bath is oxidized, causes metal oxide too much, influences product quality.
3. the easy scaling of copper tube needed the blowing out pickling once in per two months, had reduced the utilization rate of stove, and influence is produced, and simultaneously, labor strength is big, inclement condition.
4. waste a large amount of water,, needed with 3000 tons of cooling waters in every month as the molten aluminium stove of 250 kilograms line-frequency induction.
The object of the present invention is to provide a kind of novel industrial frequency electric resistance induction furnace, during with its smelting metal or alloy, can improve effective power, need not water-cooled, energy-saving and water-saving can improve the metallurgical quality of metal and alloy again.
Solution of the present invention is on the basis of former power frequency induction furnace, replaces copper tube to make induction coil with solid heat-resisting alloy garden shape wire rod.This coil has double action, both as heater, is again the induction coil that produces vortex induction heat, so claim inductive reactance two heat coils.And cancelled heat-insulation layer between crucible and the induction coil, removed water-cooling system.
The required origin of heat of furnace charge is in two aspects in the melting kettle: the one, derive from the vortex induction heat that the two heat coils of inductive reactance produce; The 2nd, derive from the two heat coils of inductive reactance as resistance heat that heater produced.Resistance heat mainly is that form with radiation is with the heat transferred crucible.Owing to do not have heat-insulation layer between two heat coils of inductive reactance and the crucible, have only one section little space, therefore, the transmission efficiency height of resistance heat; Simultaneously, because no heat-insulation layer, leakage field is little, and air-gap is little, Induction Heating efficient height.
Because the two heat coils of inductive reactance are made with heat-resisting alloy, so itself can bear 1100 ℃ high temperature.
This novel electric resistance induction furnace is based on resistance heated.60～80% of stove power, by the direct heating crucible of resistance heat, 20～40% power is metal bath in the hot heating crucible of eddy current that produces by line-frequency induction.This stove is owing to produced two kinds of approach heating, and cancelled water-cooled, the heat overwhelming majority is not is not scattered and disappeared, add that the two heat coils of inductive reactance itself can bear 1100 ℃ of high temperature, therefore, the temperature of metal or alloy melt can reach more than 1000 ℃ in the crucible, can smelt various metals and alloy thereof.
Fig. 2 is an industrial frequency electric resistance induction furnace of the present invention.6 is crucible among the figure, 7 is the two heat coils of solid heat-resisting alloy inductive reactance, 8 is the space between two heat coils and the crucible, spacing distance is 50～80 millimeters, middle no any shielding thermal barrier, 9 are the fixing high-temperature insulation skeleton of inductive reactance pair heat coils, 10 is heat insulation layer, making such as useful refractory fibre silk floss, 11 is silicon sheet core.
When the two heat coils 7 of inductive reactance pass to suitable electric current, on the one hand because resistance heat, coil itself is warmed up to operation about 1000 ℃ very soon, the a large amount of resistance heats that produce are by radiation heating crucible promptly, and changing the resistance heating that traditional power frequency induction furnace is harmful to is the useful heat of the present invention; On the other hand, because coil electricity produces line-frequency induction eddy current heat, the metal bath in the heating crucible in crucible.Because have refractory fiber cotton heat insulation layer 10 heat insulation between coil 7 and the silicon sheet core 11, after long-time running, the silicon sheet core temperature is still less than 60 ℃.
Compare with existing traditional power frequency induction furnace, the present invention has following advantage:
1. owing to made full use of the resistance heat and the vortex induction heat of the two heat coils of inductive reactance, and eliminated the heat that water-cooled is taken away, thereby thermal efficiency height, can economize on electricity 40% than existing power frequency induction furnace.
2. owing to do not need water-cooled, saved a large amount of water.
3. improved the quality of product.Because the vortex induction heating power only accounts for 25～30% of general power, so function composite by electromagnetic stirring is little, the mushroom head that no bath surface seethes, liquid is oxidized little, so oxide is few, quality improves.
4. long service life did not need shutdown to repair in general 2 years.
5. cost is low, because of having cancelled water-cooling system, and does not need heat-insulation layer, so the stove cost is lower than other power frequency induction furnace of identical heat size.
5 power factor (PF) height can reach 0.95～0.98, do not need or only need 1/4th capacitance compensation of other power frequency induction furnace.
Embodiment one
Adopt the heat-resisting alloy wire rod to make the two heat coils of inductive reactance, be installed on the high-temperature insulation skeleton, and the employing capacity is 250 kilograms of crucibles and refractory fiber cotton, silicon sheet core etc., is assembled into 250 kilograms of industrial frequency electric resistance induction furnaces.The power of stove is 80KW.With this stove melting almag, melting one stove needs 1.5 hours, and power consumption is 480 kilowatt-hours/ton.
Embodiment two
The employing capacity is 1000 kilograms a crucible, and refractory fiber cotton and silicon sheet core etc., and with the two heat coils of heat-resisting alloy wire rod making inductive reactance, be placed on the high-temperature insulation skeleton, finally the capacity of being assembled into is 1000 kilograms a industrial frequency electric resistance induction furnace.The power of stove is 200KW.With this stove melting almag, smelted a stove 2.5 hours consuming time, power consumption is 500 kilowatt-hours/ton.
Claims (3)
1. an industrial frequency electric resistance induction furnace that comprises crucible, induction coil, silicon sheet core is characterized in that induction coil is the two heat coils made from solid heat-resisting alloy wire rod of inductive reactance.
2. industrial frequency electric resistance induction furnace according to claim 1 is characterized in that between two heat coils of inductive reactance and the crucible be a space, and spacing is 50～80 millimeters, and is middle without any the shielding thermal barrier.
3. industrial frequency electric resistance induction furnace according to claim 1 is characterized in that cancelling the cooling water system of induction coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87102657 CN87102657A (en) | 1987-04-13 | 1987-04-13 | Industrial frequency electric resistance induction furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 87102657 CN87102657A (en) | 1987-04-13 | 1987-04-13 | Industrial frequency electric resistance induction furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN87102657A true CN87102657A (en) | 1988-12-07 |
Family
ID=4814055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 87102657 Withdrawn CN87102657A (en) | 1987-04-13 | 1987-04-13 | Industrial frequency electric resistance induction furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN87102657A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045110C (en) * | 1997-07-29 | 1999-09-15 | 石炭井矿务局 | Calcium-silicon compound deoxident and producing technology thereof |
| CN102080931A (en) * | 2010-12-21 | 2011-06-01 | 黄喜锤 | High frequency induction aluminum melting furnace for die casting of aluminum |
| CN102788499A (en) * | 2012-09-07 | 2012-11-21 | 无锡豪特维思热能科技有限公司 | Hearth structure of induction heating smelting furnace |
| CN102802293A (en) * | 2012-09-07 | 2012-11-28 | 无锡豪特维思热能科技有限公司 | Induction coil without needing to be cooled |
| CN103673599A (en) * | 2013-06-18 | 2014-03-26 | 叶道平 | Medium-frequency induction furnace |
| CN110891335A (en) * | 2019-11-22 | 2020-03-17 | 中国航天空气动力技术研究院 | Heat accumulating type induction heating equipment |
| CN111356254A (en) * | 2020-03-03 | 2020-06-30 | 富士电机株式会社 | Induction heating device |
-
1987
- 1987-04-13 CN CN 87102657 patent/CN87102657A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045110C (en) * | 1997-07-29 | 1999-09-15 | 石炭井矿务局 | Calcium-silicon compound deoxident and producing technology thereof |
| CN102080931A (en) * | 2010-12-21 | 2011-06-01 | 黄喜锤 | High frequency induction aluminum melting furnace for die casting of aluminum |
| CN102080931B (en) * | 2010-12-21 | 2012-12-05 | 黄喜锤 | High frequency induction aluminum melting furnace for die casting of aluminum |
| CN102788499A (en) * | 2012-09-07 | 2012-11-21 | 无锡豪特维思热能科技有限公司 | Hearth structure of induction heating smelting furnace |
| CN102802293A (en) * | 2012-09-07 | 2012-11-28 | 无锡豪特维思热能科技有限公司 | Induction coil without needing to be cooled |
| CN103673599A (en) * | 2013-06-18 | 2014-03-26 | 叶道平 | Medium-frequency induction furnace |
| CN110891335A (en) * | 2019-11-22 | 2020-03-17 | 中国航天空气动力技术研究院 | Heat accumulating type induction heating equipment |
| CN111356254A (en) * | 2020-03-03 | 2020-06-30 | 富士电机株式会社 | Induction heating device |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication |