EP0765592B1 - Verlustarme induktionsspule zum erwärmen und/oder schmelzen von metallischem gut - Google Patents
Verlustarme induktionsspule zum erwärmen und/oder schmelzen von metallischem gut Download PDFInfo
- Publication number
- EP0765592B1 EP0765592B1 EP95917895A EP95917895A EP0765592B1 EP 0765592 B1 EP0765592 B1 EP 0765592B1 EP 95917895 A EP95917895 A EP 95917895A EP 95917895 A EP95917895 A EP 95917895A EP 0765592 B1 EP0765592 B1 EP 0765592B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- induction coil
- current
- braid
- coil
- hollow
- 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
- 230000006698 induction Effects 0.000 title claims abstract description 52
- 239000007769 metal material Substances 0.000 title claims abstract description 7
- 238000010438 heat treatment Methods 0.000 title claims abstract description 4
- 238000002844 melting Methods 0.000 title claims abstract description 4
- 230000008018 melting Effects 0.000 title claims abstract description 4
- 239000002826 coolant Substances 0.000 claims abstract description 22
- 239000004020 conductor Substances 0.000 claims abstract description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 9
- 239000010949 copper Substances 0.000 claims abstract description 9
- 238000004804 winding Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims 1
- 239000000696 magnetic material Substances 0.000 claims 1
- 239000010959 steel Substances 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 5
- 230000004907 flux Effects 0.000 abstract 1
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- H05B6/22—Furnaces without an endless core
- H05B6/24—Crucible furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B14/00—Crucible or pot furnaces
- F27B14/06—Crucible or pot furnaces heated electrically, e.g. induction crucible furnaces with or without any other source of heat
- F27B14/061—Induction 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
- H05B6/36—Coil arrangements
- H05B6/42—Cooling of coils
Definitions
- the invention relates to a low-loss induction coil for Heating and / or melting of metallic material, with from strand-shaped hollow bodies formed, leading a coolant Coils.
- Induction coils of the type mentioned above which consist of copper waveguides. Through this waveguide the induction current is conducted while a fluid coolant, e.g. Water flowing through the inside of the waveguide. Induction coils designed in this way in the end regions there is an increased loss of energy because it increases there occurring magnetic cross fields in the copper waveguide Induce eddy currents.
- a fluid coolant e.g. Water flowing through the inside of the waveguide.
- induction coils have compared to the induction coils from waveguides the disadvantage that their manufacture and also those necessary to ensure adequate cooling Measures are more complex and more expensive.
- the individual conductors or strands must be in spite of the surrounding electrically insulating means, e.g. Lacquer or Insulation hose, in good thermal contact with the Coolant.
- the present invention has for its object an induction coil of the type mentioned at the outset, which is effective and inexpensive losses over the entire coil length reduced.
- this object is achieved in that in the Windings in at least one of the end areas of the induction coil a current-carrying element in the form of at least a strand made of isolated single conductors provided is and that the remaining turns as a waveguide trained and each electrically to the current-carrying element are connected.
- the coil according to the invention can be designed such that the strand-like hollow body receiving the strand (s) a non-magnetic, poorly conductive material.
- the induction coil according to the invention can also be designed in this way be that the strand-shaped receiving the strand (s) Hollow bodies are made of V2A stainless steel.
- V2A stainless steel also has for the application concerned here its thermal and chemical resistance low electrical conductivity. This will the occurrence of eddy currents in which the fluid coolant leading strand-shaped hollow body avoided.
- the induction coil according to the invention can do so be carried out that the waveguide and the single conductor the strand (s) are made of copper.
- the induction coil according to the invention can also be designed in this way be that every strand of a thermal and against the coolant-resistant insulation is surrounded.
- the induction coil according to the invention can also be designed in this way be that within a strand a coolant Cooling channel is provided.
- the induction coil according to the invention can do so be designed so that several strands form a strand bundle, that of a thermally and coolant resistant Isolation is surrounded.
- the induction coil according to the invention can also be designed in this way be that within a bundle of strands the coolant leading cooling channel is provided.
- the induction coil according to the invention can be designed in this way be that the cross section of the strand-shaped hollow body is rectangular.
- the induction coil according to the invention can do so be formed that on the adjacent to the waveguide End of each strand-shaped hollow body receiving the strand (s) on the outside of the coil with the strand (s) electrically connected power connector is attached.
- the rectangular profile of the strand-shaped hollow body causes a higher position stability compared to round profiles of the individual turns lying on top of each other. Furthermore is given the width and height of the hollow body for given dimensions in the case of a rectangular profile, the volume of what is enclosed with it Space, which also means the coolant throughput is maximized. In addition, distracting free spaces between trained waveguides practically turned off will.
- Fig. 1 shows schematically an induction furnace with a Crucible 1 for receiving a metallic, not shown here Good and with an induction coil 2, whose magnetic field Eddy currents are generated in the metallic material, which warm this good.
- the turns of the induction coil 2 are made of strands Hollow bodies 3.4 formed with a rectangular profile.
- the area of the induction coil 2 is the hollow body Current-carrying waveguide 3 made of copper.
- the end region of the induction coil 2 consists of the hollow body 4 on the other hand made of V2A stainless steel, and the induction current is within this hollow body 4 by strands 6 made of copper headed.
- At the transition between waveguide 3 and hollow body 4 are means for electrical connection 7 of the strand 6 to the waveguide 3 only shown schematically.
- the cooling rings 5 do not carry induction current, but only conduct a fluid coolant.
- FIG. 2 shows an enlarged cross section of a hollow body 4 with a strand 6 running through it.
- the hollow body 4 has a compared to the copper low electrical conductivity, which is why in its walls no significant eddy currents due to alternating magnetic fields be induced.
- the strand 6 consists of a Large number of isolated individual conductors, so that no extensive eddy currents are induced here either can.
- the strand 6 is surrounded by a hose 8 which the strand 6 holds together against mechanical loads and also against possible effects of the fluid coolant protects.
- a cooling channel 9 is provided.
- Fig. 4 illustrates how the electrical connection of the Strand 6 can be performed on the waveguide 3.
- a connection piece 10 is provided, via the a tube 11 made of glass fabric is put over.
- the other The end of the tube 11 is a tube 11 that seals the tube, electrically conductive plug 12, e.g. made of copper, used, the one with the wire at one end electrically 6 is connected and at its other end outside the Hose 11 has a power connector 13.
- electrically conductive plug 12 e.g. made of copper
- the plug 12 also has a coolant channel 14 which allow the coolant to escape or be passed on can.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- General Induction Heating (AREA)
- Furnace Details (AREA)
Description
- Fig. 1:
- in schematischer Darstellung einen Induktionsofen mit erfindungsgemäß ausgebildeter Induktionsspule im Axialschnitt,
- Fig. 2:
- in schematischer Darstellung den Querschnitt eines strangförmigen Hohlkörpers in einem der axialen Endbereiche der Spule mit einer Litze als stromführendes Element,
- Fig. 3:
- eine Darstellung gem. Fig. 2 mit einem in der Litze vorgesehenen Kühl kanal und
- Fig. 4:
- in schematischer Darstellung den Stromanschluß einer Litze zur Kopplung mit einem elektrischen Hohlleiter.
- 1.
- Tiegel
- 2.
- Induktionsspule
- 3.
- Hohlleiter
- 4.
- Hohlkörper
- 5.
- Kühlwindung
- 6.
- Litze
- 7.
- Mittel zum elektrischen Anschluß der Litze
- 8.
- Isolierungsschlauch
- 9.
- Kühl kanal
- 10.
- Anschlußstutzen
- 11.
- Glasgewebeschlauch
- 12.
- Stopfen
- 13.
- Stromanschlußklemme
- 14.
- Kühlmittelkanal des Stopfens
Claims (10)
- Verlustarme Induktionsspule (2) zum Erwärmen und/oder Schmelzen von metallischem Gut, mit aus strangförmigen Hohlkörpern (3,4) gebildeten, ein Kühlmittel führenden Windungen, dadurch gekennzeichnet, daß in den Windungen in zumindest einem der Endbereiche der Induktionsspule (2) ein stromführendes Element (6) in Form von mindestens einer aus isolierten Einzelleitern bestehenden Litze (6) vorgesehen ist und daß die restlichen Windungen als Hohlleiter (3) ausgebildet und jeweils an das stromführende Element (6) elektrisch angeschlossen sind.
- Induktionsspule nach Anspruch 1, dadurch gekennzeichnet, daß die die Litze(n) (6) aufnehmenden strangförmigen Hohlkörper (4) aus einem unmagnetischen, schlecht leitenden Material bestehen.
- Induktionsspule nach Anspruch 1, dadurch gekennzeichnet, daß die die Litze(n) (6) aufnehmenden strangförmigen Hohlkörper (4) aus V2A-Edelstahl bestehen.
- Induktionsspule nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Hohlleiter (3) und die Einzelleiter der Litze(n) (6) aus Kupfer hergestellt sind.
- Induktionsspule nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß jede Litze (6) von einer thermisch und gegen das Kühlmittel beständigen Isolation (8) umgeben ist.
- Induktionsspule nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß innerhalb einer Litze (6) ein ein Kühlmittel führender Kühl kanal (9) vorgesehen ist.
- Induktionsspule nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß mehrere Litzen (6) ein Litzenbündel bilden, das von einer thermisch und gegen das Kühlmittel beständigen Isolation umgeben ist.
- Induktionsspule nach Anspruch 7, dadurch gekennzeichnet, daß innerhalb eines Litzenbündels ein das Kühlmittel führender Kühl kanal (9) vorgesehen ist.
- Induktionsspule nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß der Querschnitt der strangförmigen Hohlkörper (3,4) rechteckig ist.
- Induktionsspule nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß an dem am Hohlleiter (3) angrenzenden Ende jedes die Litze(n) (6) aufnehmenden strangförmigen Hohlkörpers (4) an der Spulenaußenseite eine mit der (den) Litze(n) (6) elektrisch verbundene Stromanschlußklemme (13) angebracht ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4420463 | 1994-06-13 | ||
DE4420463 | 1994-06-13 | ||
PCT/DE1995/000622 WO1995035014A1 (de) | 1994-06-13 | 1995-05-11 | Verlustarme induktionsspule zum erwärmen und/oder schmelzen von metallischem gut |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0765592A1 EP0765592A1 (de) | 1997-04-02 |
EP0765592B1 true EP0765592B1 (de) | 1998-04-22 |
Family
ID=6520369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95917895A Expired - Lifetime EP0765592B1 (de) | 1994-06-13 | 1995-05-11 | Verlustarme induktionsspule zum erwärmen und/oder schmelzen von metallischem gut |
Country Status (5)
Country | Link |
---|---|
US (1) | US5744784A (de) |
EP (1) | EP0765592B1 (de) |
AT (1) | ATE165488T1 (de) |
DE (1) | DE59501998D1 (de) |
WO (1) | WO1995035014A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7323666B2 (en) | 2003-12-08 | 2008-01-29 | Saint-Gobain Performance Plastics Corporation | Inductively heatable components |
FR2972890B1 (fr) * | 2011-03-18 | 2014-07-25 | Inst Polytechnique Grenoble | Systeme inductif pouvant servir de creuset froid |
EP3401695A1 (de) | 2017-05-08 | 2018-11-14 | Koninklijke Philips N.V. | Kühlung einer gradientenspule eines magnetresonanzbildgebungssystems |
CN109909383A (zh) * | 2019-03-12 | 2019-06-21 | 华电电力科学研究院有限公司 | 松弛法直轴水冷式加热装置 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE523823C (de) * | 1931-04-28 | Hirsch Kupfer Und Messingwerke | Spule fuer Induktionsoefen, bestehend aus einem stromleitenden und einem waermeabfuehrenden Teil | |
US1839801A (en) * | 1930-03-26 | 1932-01-05 | Ajax Electrothermic Corp | Electric induction furnace |
US2457843A (en) * | 1944-09-02 | 1949-01-04 | Ohio Crankshaft Co | Flexible conductor for induction heating |
DE1095903B (de) * | 1958-04-29 | 1960-12-29 | Wild Barfield Electr Furnaces | Elektrischer Leiter |
US3260792A (en) * | 1962-02-05 | 1966-07-12 | Kreisel Otto | Metal braided induction heating conductor coil |
DE1179655B (de) * | 1963-10-12 | 1964-10-15 | Aeg | Induktionsheizspule |
DE2217407A1 (de) * | 1972-04-11 | 1973-11-29 | Siemens Ag | Induktionsheizspule zum tiegelfreien zonenschmelzen |
GB2052836A (en) * | 1979-06-23 | 1981-01-28 | Induction Heat Treatments Ltd | Electric cable |
CA1266094A (en) * | 1986-01-17 | 1990-02-20 | Patrick Earl Burke | Induction heating and melting systems having improved induction coils |
FR2657216B1 (fr) * | 1990-01-16 | 1995-09-01 | Sundgau Sarl Atel Const Elect | Inducteur pour un four a induction, comportant un tube parcouru par un liquide de refroidissement. |
DE4109818A1 (de) * | 1990-12-22 | 1991-11-14 | Edwin Schmidt | Verfahren und vorrichtung zum tiefkuehlen elektrischer hohlleiter stromdurchflossener spulen |
FR2693072B1 (fr) * | 1992-06-24 | 1994-09-02 | Celes | Perfectionnements apportés aux bobines de système de chauffage par induction. |
US5461215A (en) * | 1994-03-17 | 1995-10-24 | Massachusetts Institute Of Technology | Fluid cooled litz coil inductive heater and connector therefor |
-
1995
- 1995-05-11 DE DE59501998T patent/DE59501998D1/de not_active Expired - Fee Related
- 1995-05-11 EP EP95917895A patent/EP0765592B1/de not_active Expired - Lifetime
- 1995-05-11 US US08/750,589 patent/US5744784A/en not_active Expired - Fee Related
- 1995-05-11 AT AT95917895T patent/ATE165488T1/de not_active IP Right Cessation
- 1995-05-11 WO PCT/DE1995/000622 patent/WO1995035014A1/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
US5744784A (en) | 1998-04-28 |
ATE165488T1 (de) | 1998-05-15 |
WO1995035014A1 (de) | 1995-12-21 |
DE59501998D1 (de) | 1998-05-28 |
EP0765592A1 (de) | 1997-04-02 |
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