Abstract: An induction furnace comprising a upper furnace vessel; an induction coil positioned below the upper furnace vessel; and a melt-containing vessel positioned inside the induction coil and communicably connected to the upper furnace vessel, wherein the positioning of the melt-containing vessel inside the induction coil defines a gap between an outside surface of the melt-containing vessel and an inside surface of the induction coil. A system for direct-chill casting comprising at least one an induction furnace; at least one in-line filter operable to remove impurities in molten metal; at least one gas source coupled to a feed port associated with the gas; and at least one device for solidifying metal by casting. A method of cooling an induction furnace comprising introducing a gas into a gap between an induction coil and a melt-containing vessel positioned inside the induction coil; and circulating the gas through the gap.

Abstract: Disclosed are embodiments of a vessel configured to contain a secondary magnetic induction field therein for melting materials, and methods of use thereof. The vessel can be used in an injection molding apparatus having an induction coil positioned along a horizontal axis and adjacent to the vessel. The vessel can have a tubular body configured to substantially surround and receive a plunger tip. At least one longitudinal slot extends through the thickness of the body to allow and/or direct eddy currents into the vessel during application of an RF induction field from the coil. The body also includes temperature regulating lines configured to flow a liquid within. The temperature regulating lines can be provided to run longitudinally within the wall(s) of the body between its inner bore and outer surface(s). A flange may be provided at one end of the body to secure the body within an injection molding apparatus.

Abstract: A melting furnace including a sealed container containing an inert gas atmosphere, a crucible that is located inside the sealed container and melts a raw material by induction heating, and a crucible cooling mechanism. The crucible cooling mechanism includes a pipe portion that includes an intake that communicates with the sealed container and enables the inert gas to be discharged from the sealed container, and an outlet that enables the inert gas to be introduced into the sealed container, a heat exchange portion that is located partway along the pipe portion, and a gas transporting portion that is located partway along the pipe portion.

Abstract: Disclosed herein is a melting apparatus for melt-decontaminating radioactive metal waste. The melting apparatus includes a melting furnace, a high frequency generator, a ladle, a bogie, a cooling unit and a dust collector. The melting furnace includes a crucible into which the metal waste is input, and an induction coil which is wound around the crucible to melt the metal waste. The induction coil has a hollow hole in which cooling fluid flows. The high frequency generator applies high-frequency current to the induction coil. The ladle supplies molten metal, from which slag has been removed in the crucible, into molds. The bogie is disposed adjacent to the ladle and is provided with the molds, each of which forms an ingot using the molten metal supplied thereinto. The cooling unit cools the cooling fluid and circulates it along the induction coil. The dust collector filters out dust and purifies gas.

Abstract: An induction heating apparatus that can operate at current frequencies of greater than 60 Hz and at least 1 kW. The induction heating apparatus includes a high frequency power supply, a superconductive induction coil, and a fluid cooling system. A fluid cooling system is designed to cause a cooling fluid to flow at least partially about and/or through the superconductive induction coil.

Abstract: A melting furnace includes a gas supplying unit configured to protrude inwardly of the melting furnace to supply a gas to the melting furnace, the gas supplying unit including a gas supplying pipe configured to penetrate the melting furnace to protrude inwardly of the melting furnace and configured to have a nozzle hole formed at a front end thereof; and a cooling passage pipe provided outside the gas supplying pipe to include a second cooling passage through which a cooling liquid flows, the second cooling passage being directly connected to a first cooling passage through which the cooling liquid is circulated along a wall of the melting furnace.

Abstract: A cold crucible induction melter includes an induction coil and a melting furnace. The induction coil serves as a water cooled segment to directly transmit an induced current to a molten material in the cold crucible induction melter (CCIM), improving energy efficiency. Simultaneously, the structure of the CCIM is simplified and enables a smooth discharge even when the molten material consists of a ceramic or a metal material with a high melting point. The cold crucible induction melter heats and melts waste using an induced current which is generated in a water cooled segment by a high frequency current that is applied to the induction coil. The water cooled segment and the induction coil are disposed in a vertical direction so that the induced current that is generated by the induction coil is directly transmitted to the molten material.

Abstract: A melting furnace includes a gas supplying unit configured to protrude inwardly of the melting furnace to supply a gas to the melting furnace, the gas supplying unit including a gas supplying pipe configured to penetrate the melting furnace to protrude inwardly of the melting furnace and configured to have a nozzle hole formed at a front end thereof; and a cooling passage pipe provided outside the gas supplying pipe to include a second cooling passage through which a cooling liquid flows, the second cooling passage being directly connected to a first cooling passage through which the cooling liquid is circulated along a wall of the melting furnace.

Abstract: This invention is provided for improvement of corrosion-resistant property of a crucible and for promotion of safety in a pyrochemical reprocessing method for the spent nuclear fuel. The spent nuclear fuel is dissolved in a molten salt placed in the crucible. In a pyrochemical reprocessing method, the nuclear fuel is deposited, and the crucible (2) is heated by induction heating. Cooling media (5, 6) are supplied to cool down, and a molten salt layer (7) is maintained by keeping balance between the heating and the cooling, and a solidified salt layer (8) is formed on inner wall surface of the crucible.

Abstract: An induction furnace includes material between the crucible and the coil to enable easy removal when the crucible needs to be replaced. The material is made up of a slip plane material and reinforcement, and preferably comprises a laminate of flexible mica paper and glass fabric.

Abstract: An assembly includes a tapping device for flow therethrough of molten material and a cooled inductor to be connected to an electrical source and mounted with respect to the tapping device to be inductively coupled to one of the tapping device and the molten material flowing therethrough. The inductor includes an electrically conductive induction coil having therethrough at least one cooling passage. Each cooling passage has connected thereto at least one supply line for supply thereto of cooling fluid and at least one discharge line for discharge therefrom of the cooling fluids.

Abstract: In a method of operating an inductor of a tapping device of a melt vessel, the inductor couples inductively during a working phase with an electrically conductive shaped component and is cooled by means of a fluid. The inductor is electrically decoupled and cooled by means of a fluid in another working phase.

Abstract: In a method of operating an inductor of a tapping device of a melt vessel, the inductor couples inductively during a working phase with an electrically conductive shaped component and is cooled by means of a fluid. The inductor is electrically decoupled and cooled by means of a fluid in another working phase.

Abstract: An induction heating apparatus having a refractory vessel for holding a quantity of material to be heated by the apparatus. The vessel being surrounded by, but does not touch, an induction coil having a plurality of helical turns. The turns of the induction coil have a surface on which is disposed a layer of high temperature superconducting material.

Abstract: Described is a low-loss induction coil for heating and/or melting metallic materials, the coil having windings formed by lengths of hollow tubing carrying a fluid coolant. In the central zone of the induction coil, the current is carried by hollow conductors made of copper which at the same time form the hollow tubing. Fitted at least in the windings at one end of the coil is a current-carrying element in the form of at least one braid whose individual conductors are insulated from each other, while remaining windings are designed as hollow conductors connected to the current-carrying element. The use of braids as the current carrier leads, at the end of the coil, to a reduction in eddy-current losses caused by transverse magnetic fields, while the use of hollow conductors in the rest of the coil results in the mean distance between the current flux and the metallic material being heated being kept at the minimum and losses due to this distance thus kept low.

Abstract: In an electric furnace including a heating device which includes a cooling water passage for cooling the heating device to prevent the heating device from melting, estimation of a molten metal temperature in the electric furnace using a heat equilibrium model is conducted taking into account a thermal loss by the cooling water, i.e., the amount of a heat taken away by the cooling water. Further, the amount of the cooling water flowing through the heating device is adjusted so that the thermal loss by the cooling water is in a predetermined optimum thermal loss range.

Abstract: A magnetic yoke for an induction crucible furnace includes a bar-shaped core stack for conducting magnetic flux generated by a furnace coil of the furnace. The core stack is formed of a multiplicity of individual, mutually electrically insulated single laminations with edges. The core stack has a first principal surface facing the furnace coil and three second principal surfaces not facing the furnace coil. The first principal surface has a shape being subdivided three-fold, defining a central region of the core stack to be positioned very near the furnace coil and two lateral regions of the core stack adjacent the central region, and defining a distance between the edges of the single laminations of the core stack and the furnace coil being increased towards the edge in the two lateral regions of the core stack, forming acute-angled, lamination-free sectors parallel to the furnace axis in two peripheral regions of the magnetic yoke being directed towards the furnace coil.

Abstract: A device achieves thermal protection and cooling of the poles of an electromagnetic inductor, in particular for an induction furnace. The furnace comprises a plurality of tubes, arranged side by side and substantially coplanar, through which a coolant fluid flows. The connection of the tubes to the inlet and outlet pipes for the coolant fluid is made by a combination of socket and O-rings designed to ensure both electrical discontinuity and leaktightness between each tube and the pipes.

Abstract: Electrically conductive tubing for realizing induction coils having improved efficiencies comprises an outer peripheral portion of conductive material defined by a plurality of side walls and a single hollow passageway. Each side wall has an inner and outer surface. At least one side wall has a curved outer surface. The hollow passageway is defined by the inner surfaces and can be either centered within the tubing or spaced apart from the center of the tubing. The present invention also defines an induction coil and an induction furnace having an induction coil which utilizes such tubing. The curved outer surface has a radius of curvature which is defined substantially by a function of the tubing width in the axial direction, and spacing between turns of the induction coil. The cross section of the outer surface of the outer peripheral portion of the tubing taken along a transverse axis of the tubing defines a geometric figure.

Abstract: An induction crucible furnace has a furnace axis and a furnace coil generating magnetic flux. A magnetic yoke for the furnace includes a barlike lamination packet for guiding the magnetic flux. The lamination packet has a middle region and two lateral regions being adjacent the middle region and having borders facing away from the middle region. The lamination packet has a number of individual single laminations having edges and being electrically insulated from one another. The lamination packet has a main surface facing the furnace coil with a shape being sectioned into three parts for positioning the middle region relatively close to the furnace coil and defining a distance between the edges of the individual laminations and the furnace coil being increased in the two lateral regions toward the borders. Two peripheral regions face toward the furnace coil and have acute-angled, lamination-free sectors being parallel to the furnace axis.

Abstract: In an induction furnace including a crucible having a crucible center axis and a coil member wound around the crucible, the coil member has a coil center axis oblique to the crucible center axis at an acute angle between 3.degree. and 10.degree.. The coil member is consequently wound around the crucible so that each winding of the coil member is inclined to the crucible center axis at an angle except 90.degree. and has a highest position and a lowest position on a crucible side wall of the crucible. An inlet port and an outlet port of the crucible are located at positions adjacent to the highest and the lowest positions of the windings, respectively.

Abstract: A magnetic yoke for an induction crucible furnace includes a rod-shaped core stack being suitable for carrying magnetic flux generated by a furnace coil of the induction crucible furnace. The core stack is enclosed on three principal surfaces thereof not facing the furnace coil by a flexurally and torsionally rigid support body having a C or U-shaped cross section. The support body is preferably formed of a material with good electrical conductivity and has longitudinal channels suitable for carrying a coolant. Preferably, an extruded profiled part formed of an aluminum alloy is used.

Abstract: An apparatus for directing electromagnetic flux near an induction coil comprises a loop-shaped member adapted to conduct electromagnetic flux, defining an axis parallel to the central axis of the induction coil and extending substantially the length of the coil. The loop-shaped member acts as a return circuit for minimizing a stray magnetic field external to the coil.

Abstract: A power activated assembly is disclosed that provides rapid and simultaneous disconnection and reconnection of water cooled power connectors to and from an induction furnace of a melting assembly which is tiltable about the axis of its trunnion. The power activated assembly carries extensions that have respective female connectors on the end and which have flexible conductors connected for supplying electrical power and cooling water to the induction furnace. The housing is positioned concentric with the trunnion so as to allow its female connectors to mate with corresponding male connectors of the assembly when the housing is axially moved toward and along the trunnion axis in response to motion control means such as a power activated device. The male connectors are distributed on the assembly about and inside the circumference of the trunnion.

Abstract: An apparatus for melting metallic stock as a crucible in which the metallic stock is received and melted, the stock in the crucible having an axis along which the force of gravity varies, and an inductive heating system which generates an inductive heating field having an inductive power density which varies along the axis. The inductive heating field interacts with the metallic stock in the crucible so that the radiation energy generated by the inductive heating field counteracts the hydrostatic pressure of the melt in the crucible.

Abstract: A coreless induction furnace comprising a crucible for holding a quantity of metal to be heated by the furnace. The crucible has an open top, side walls and a closed bottom. An induction coil is operatively associated with the crucible for generating a time-varying magnetic induction field. Coupling structure extending above the top of the crucible is provided to couple at least a portion of the induction field to the center portion of the top surface of the metal to be heated.

Abstract: An induction furnace for melting refractory materials into a molten state by induction from a high frequency alternating current source. The furnace comprises a material holding crucible formed by a substantially cylindrical side wall having a single cylindrical turn. The side wall terminates in end portions which are spaced apart from each other to define a slot therebetween which extends generally longitudinally of the cylindrical wall. The side wall portions are connected to the source of alternating current so that the side wall turn comprises both the crucible and an inductor. An electrically conductive, elongated cooled member is mounted in the slot in spaced relation between each of the end portions. The elongated member is electrically insulated from the end portions to increase the breakdown voltage between the end portions.

Abstract: A metallurgical container for the inductive treatment of metals comprises an inner lining of refractory material and a generally tubular enclosure comprising an upper annular casing surrounding the upper open end of the inner lining, a lower annular casing surrounding the bottom of said container, and a plurality of circumferentially spaced metallic tie rods extend parallel to each other through a median heating zone of the container. A plurality of connecting elements respectively extending through openings in the bottom wall of the upper casing and the top wall of the lower casing, electrically insulated from those walls, tightly connect opposite ends of the tie rods to each wall. The tie rods and the connecting elements are formed with coaxial channels for the passage of cooling fluid therethrough which is fed into one of the casings and discharged from the other.The container according to the present invention permits powerful inductive treatment of metal and metal alloys, especially steel.