EP0752194B1 - Induktionstiegelofen mit mindestens zwei parallel an einen schwingkreisumrichter angeschlossenen spulen - Google Patents
Induktionstiegelofen mit mindestens zwei parallel an einen schwingkreisumrichter angeschlossenen spulen Download PDFInfo
- Publication number
- EP0752194B1 EP0752194B1 EP95913850A EP95913850A EP0752194B1 EP 0752194 B1 EP0752194 B1 EP 0752194B1 EP 95913850 A EP95913850 A EP 95913850A EP 95913850 A EP95913850 A EP 95913850A EP 0752194 B1 EP0752194 B1 EP 0752194B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coils
- crucible
- capacitors
- parallel
- converter
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
- H05B6/067—Control, e.g. of temperature, of power for melting furnaces
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
- H05B6/22—Furnaces without an endless core
- H05B6/24—Crucible furnaces
Definitions
- the invention relates to an induction crucible furnace with at least two in parallel to a load-controlled resonant circuit converter connected, the scope of a vertical Crucible enclosing and in the direction of the crucible axis positioned one behind the other, in series with a capacitive Resistance switched coils.
- An object according to the preamble is e.g. from EP-A-0 403 138 already known.
- the upstream capacitive resistor has the purpose of bringing the resonant circuit into the range of the resonant vibration.
- an ideal series resonant circuit with a coil of inductance L, a capacitor of capacitance C and a vanishing ohmic resistance is considered below.
- the Melting material an increasing or decreasing in the axial direction Power density to feed the movement of the To affect melt pool.
- Another example of a different power requirement is through in different crucible areas given a partially filled crucible, e.g. during the loading of the crucible or possibly at a lower than maximum possible amount of melting material the case is.
- an empty crucible part Do not pass any power to the surrounding coils to the melt.
- the inductance of a coil can increase accordingly
- a desired distribution of power is also said above can be brought about by a series resonant circuit converter is used, whose operating frequency is slightly below the resulting resonance frequency of the entire system lies.
- a power distribution caused solely by the melting material but apart from the level of the crucible is only of depending on the physical properties of the melting material.
- the invention has for its object with simple Averaging an effective distribution by a resonant circuit converter power output on the individual coils to be able to determine.
- each coil will become dependent of capacity and - also depending on the level - Inductance of their resonant circuit an adjusted voltage and thus can adjust power consumption.
- Single resonant circuits with low power requirements are then outside their resonance frequency and individual resonant circuits with high Line requirements operated in resonance.
- the induction crucible furnace according to the invention can also do so be designed so that the capacity of at least one of the capacitive resistors is changeable.
- Possible capacitive resistors are capacitor units, which consist of a single capacitor or else several capacitors and possibly switching elements put together.
- the switching elements allow the individual Capacitors interconnected in different ways so that the total capacitance of the capacitor unit set to different values as needed leaves.
- a variable capacitance has the advantage that the resonance frequency of a single resonant circuit if necessary changing process conditions, e.g. for crucible loading, can also be adjusted during furnace operation can.
- the induction crucible furnace according to the invention be designed so that at least one of the coils On / off switch is connected in series.
- Fig. 1 shows an induction crucible furnace, the only for Half crucible filled with melting material 1 2 out of two Coils 3, 4 is surrounded. In line with each coil is 3.4 each a capacitor 6.7 connected, so that two separate individual resonant circuits 8.9 arise. These are connected to a parallel resonant circuit converter 5 connected. A parallel to the individual resonant circuits 8, 9 switched capacitor 10 serves to compensate for the reactive power.
- the lower single resonant circuit 8 encloses one with melting material 1 filled part of the crucible 2, the upper single resonant circuit 9 an empty crucible part.
- the capacitance of the capacitors 8.9 are chosen to be the same size.
- the resonance frequency of the lower Single resonant circuit 8 of the operating frequency of the resonant circuit converter 5 closer than the resonance frequency of the upper Single resonant circuit 9. It follows that the by the Coils 3.4 output power on the with melting material 1 filled part of the crucible 2 is concentrated.
- the ratio of the total power actually consumed by the induction crucible furnace P GES to the nominal output of the furnace P N is plotted along the ordinate and the crucible fill level in percent is plotted along the abscissa.
- Curve 11 shows the power ratio P GES / P N as a function of the crucible fill level for an induction crucible furnace, the individual coils of which are connected in parallel in accordance with the prior art. Accordingly, the power consumption drops as soon as the crucible fill level falls below 100%.
- curve 12 shows the corresponding power ratio in the case of an induction crucible furnace according to the invention. It can be seen that the power ratio remains almost constant at P GES / P N ⁇ 1 up to a crucible fill level of well below 50%. Only at a crucible fill level of less than 10% do the two curves 11, 12 approach each other again.
- the induction crucible furnace according to the invention thus also causes an increase in the power consumed by the furnace, which is passed on to the melting material 1, when the crucible 2 is not completely filled.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Crucibles And Fluidized-Bed Furnaces (AREA)
- Furnace Details (AREA)
- General Induction Heating (AREA)
Description
- Fig. 1
- einen Induktionstiegelofen mit zwei an einen Schwingkreisumrichter parallel angeschlossenen Einzelschwingkreisen und
- Fig. 2
- ein Diagramm zur Darstellung der vom Tiegelfüllstand abhängigen Leistungsaufnahme eines erfindungsgemäßen Induktionstiegelofens im Vergleich zum Stand der Technik.
- 1
- Schmelzmaterial
- 2
- Tiegel
- 3
- Spule
- 4
- Spule
- 5
- Schwingkreisumrichter
- 6
- Kondensator
- 7
- Kondensator
- 8
- Einzelschwingkreis
- 9
- Einzelschwingkreis
- 10
- Kondensator
- 11
- Leistungsabgabe des Schwingkreisumrichters
- 12
- Leistungsabgabe des Schwingkreisumrichters
Claims (3)
- Induktionstiegelofen mit mindestens zwei parallel an einen lastgeführten Schwingkreisumrichter (5) angeschlossenen, den Umfang eines vertikalen Schmelztiegels umschließenden und in Richtung der Tiegelachse hintereinander positionierten, in Reihe mit einem kapazitiven Widerstand (6,7) geschalteten Spulen (3,4) wobei,
jeder einzelnen Spule (3,4) ein separater kapazitiver Widerstand (6,7) zugeordnet ist dadurch gekennzeichnet, daß die sich jeweils aus einer einzelnem Spule und einem separatem kapazitiven widerstand ergebenden Einzelschwingkreise (8,9) parallel geschaltet sind,
daß der Umrichter ein Parallelschwingkreisumrichter ist und daß parallel zu den Einzelschwingkreisen (8,9) ein weiterer kapazitiver Widerstand (10) geschaltet ist. - Induktionstiegelofen nach Anspruch 1, dadurch gekennzeichnet, daß die Kapazität mindestens eines der kapazitiven Widerstände (6,7) veränderbar ist.
- Induktionstiegelofen nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zu mindestens einer der Spulen (3,4) ein Ein-/Ausschalter in Reihe geschaltet ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4410436 | 1994-03-25 | ||
DE4410436 | 1994-03-25 | ||
PCT/DE1995/000376 WO1995026619A1 (de) | 1994-03-25 | 1995-03-18 | Induktionstiegelofen mit mindestens zwei parallel an einen schwingkreisumrichter angeschlossenen spulen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0752194A1 EP0752194A1 (de) | 1997-01-08 |
EP0752194B1 true EP0752194B1 (de) | 1998-07-15 |
Family
ID=6513869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95913850A Expired - Lifetime EP0752194B1 (de) | 1994-03-25 | 1995-03-18 | Induktionstiegelofen mit mindestens zwei parallel an einen schwingkreisumrichter angeschlossenen spulen |
Country Status (5)
Country | Link |
---|---|
US (1) | US5940427A (de) |
EP (1) | EP0752194B1 (de) |
AT (1) | ATE168517T1 (de) |
DE (1) | DE59502832D1 (de) |
WO (1) | WO1995026619A1 (de) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6163019A (en) * | 1999-03-05 | 2000-12-19 | Abb Metallurgy | Resonant frequency induction furnace system using capacitive voltage division |
DE19926198A1 (de) * | 1999-06-09 | 2000-12-14 | Junker Gmbh O | Schaltung und Steuerverfahren für Wechselrichter zur Speisung von Induktionsöfen |
CN1279792C (zh) * | 2001-01-08 | 2006-10-11 | 应达公司 | 具有提高了效率的线圈系统的感应炉 |
JP2004530275A (ja) * | 2001-05-22 | 2004-09-30 | インダクトサーム・コーポレイション | 底部に誘導コイルを備えた炉 |
US6993061B2 (en) * | 2003-11-07 | 2006-01-31 | Battelle Energy Alliance, Llc | Operating an induction melter apparatus |
US7085305B2 (en) * | 2004-08-25 | 2006-08-01 | Battelle Energy Alliance, Llc | Induction heating apparatus and methods of operation thereof |
US7072378B2 (en) * | 2004-08-25 | 2006-07-04 | Battelle Energy Alliance, Llc | Induction heating apparatus and methods for selectively energizing an inductor in response to a measured electrical characteristic that is at least partially a function of a temperature of a material being heated |
CN101782324B (zh) * | 2010-02-05 | 2011-09-28 | 新星化工冶金材料(深圳)有限公司 | 控制铝钛硼(碳)合金中TiB2(TiC)颗粒团平均名义直径的电磁感应熔炼电炉 |
EP3099991B1 (de) * | 2014-01-31 | 2017-12-13 | Danieli & C. Officine Meccaniche, S.p.A. | Anlage und verfahren zum schmelzen von metallmaterialien |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE453717C (de) * | 1926-08-19 | 1927-12-15 | Aeg | Schaltung fuer Hochfrequenzoefen |
US1795136A (en) * | 1927-09-08 | 1931-03-03 | Ajax Electrothermic Corp | Electric induction furnace |
US1943802A (en) * | 1930-03-18 | 1934-01-16 | Ajax Electrothermic Corp | Electric induction furnace |
GB451473A (en) * | 1935-11-12 | 1936-08-06 | Asea Ab | Means for operating electric eddy current furnaces |
GB508255A (en) * | 1937-06-02 | 1939-06-28 | British Thomson Houston Co Ltd | Improvements in and relating to induction furnaces |
US3331909A (en) * | 1965-03-12 | 1967-07-18 | Ohio Crankshaft Co | Apparatus for energizing an induction melting furnace with a three phase electrical network |
GB1166759A (en) * | 1966-12-21 | 1969-10-08 | Almex Ab | Character Readers |
GB2232832B (en) * | 1989-06-14 | 1993-11-10 | Inductotherm Europ | Induction Melting |
-
1995
- 1995-03-18 WO PCT/DE1995/000376 patent/WO1995026619A1/de active IP Right Grant
- 1995-03-18 DE DE59502832T patent/DE59502832D1/de not_active Expired - Fee Related
- 1995-03-18 EP EP95913850A patent/EP0752194B1/de not_active Expired - Lifetime
- 1995-03-18 AT AT95913850T patent/ATE168517T1/de not_active IP Right Cessation
-
1996
- 1996-03-18 US US08/702,447 patent/US5940427A/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP0752194A1 (de) | 1997-01-08 |
US5940427A (en) | 1999-08-17 |
ATE168517T1 (de) | 1998-08-15 |
DE59502832D1 (de) | 1998-08-20 |
WO1995026619A1 (de) | 1995-10-05 |
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