Channel Patents (Class 373/161)
  • Publication number: 20150131694
    Abstract: Disclosed is an induction shield configured to substantially reduce emissions emitted from an induction heat source (e.g., coil) during use. The shield is positioned adjacent to a vessel (e.g., in an injection system) having a melting portion configured to receive meltable material to be melted therein and an induction heat source positioned adjacent the vessel configured to melt the meltable material received in the melting portion of the vessel. The shield may include a tube configuration configured to flow liquid therein to absorb heat emitted from the heat source. The tube configuration can comprise a single tube or multiple tubes. The shield can be positioned adjacent the induction source in a helical manner, for example, or at ends of the vessel. The shield can be used during melting of amorphous alloy and for forming a part.
    Type: Application
    Filed: September 20, 2011
    Publication date: May 14, 2015
    Applicant: Crucible Intellectual Property, LLC
    Inventors: QuocTran Pham, Sean Timothy O'keeffe, Joseph Stevick, Theodore A. Waniuk
  • Publication number: 20150023384
    Abstract: The present invention relates to an electric channel inductor assembly. A nonremovable, hollow and nonmagnetic channel mold is used to form the one or more flow channels of the electric channel inductor assembly for electromagnetic circulation of a molten metal composition. A heated fluid medium is circulated in the hollow interior of the channel mold after the mold is situated in the inductor assembly to heat treat the refractory surrounding the exterior walls of the mold. After heat treatment a liquid is supplied to the hollow interior of the mold to chemically dissolve the channel mold prior to circulation of the molten metal composition.
    Type: Application
    Filed: October 6, 2014
    Publication date: January 22, 2015
    Inventors: Bernard M. RAFFNER, Karen SARKISSIAN
  • Patent number: 8855168
    Abstract: The present invention relates to an electric channel inductor assembly and method of forming an electric channel inductor assembly. A nonremovable, hollow, nonmagnetic channel mold is used to form the one or more flow channels of the assembly. A heated fluid medium is circulated in the hollow interior of the mold after the mold is situated in the assembly to heat treat the refractory surrounding the exterior walls of the mold. After heat treatment a liquid is supplied to the hollow interior of the mold to chemically dissolve the mold.
    Type: Grant
    Filed: April 16, 2007
    Date of Patent: October 7, 2014
    Assignee: Inductotherm Corp.
    Inventors: Bernard M. Raffner, Karen Sarkissian
  • Patent number: 8110019
    Abstract: The present invention is based on a novel electric induction furnace design that enables the removal of zinc-containing filter dust (FD) originating from the production of steel (alloy or non-alloy) and the production of cast iron with galvanized steel scrap, using a novel process based on the carbothermal reduction of the metal oxides present in the FD, performed at the temperature at which the materials are melted inside the electric induction furnace. The electric induction furnace of the invention incorporates an electric arc or plasma beam generator to melt all the inorganic non-metallic material. The incorporation of this generator also enables the use of large volumes of molten slag.
    Type: Grant
    Filed: October 3, 2008
    Date of Patent: February 7, 2012
    Assignee: Consejo Superior De Investigaciones Cientificas
    Inventor: Miguel Fernández López
  • Patent number: 7633734
    Abstract: An AC melt to bushing current detector (FIG. 4) for a channel induction furnace (FIG. 1) which can detect when molten metal from the loop (122) in a saturated inductor (FIG. 5) has come in contact with the metal bushing (236) whereupon the power to the induction coil (234) is turned off, preventing a catastrophic molten metal run out through the bushing (236).
    Type: Grant
    Filed: November 2, 2006
    Date of Patent: December 15, 2009
    Assignee: Duca Manufacturing & Consulting, Inc.
    Inventors: John P. Richardson, Timothy T. Owens
  • Patent number: 6751989
    Abstract: The invention relates to a device for melting or refining glass or glass ceramics. According to the invention, a device of this type is provided with the following characteristics: a plurality of tubes which are U-shaped and arrange side by side so that they form a cage like skull channel that is open on top, and a high frequency oscillation circuit which comprises an induction coil. The tubes can be connected to a cooling medium. The induction coil wraps around the channel in such a manner that winding sections extend along the lateral walls of the channel.
    Type: Grant
    Filed: July 12, 2001
    Date of Patent: June 22, 2004
    Assignee: Schott Glas
    Inventors: Wolfgang Schmidbauer, Hildegard Römer, Guido Räke
  • Publication number: 20030103546
    Abstract: An induction-heated furnace is disclosed. The furnace comprises a shell lined with refractory material and has walls and a floor. At least one induction heater is located in the floor of the furnace, the induction heater communicating with the interior of the furnace through a throat. The throat length is a substantial part of the service length of the induction heater. The invention also discloses structures in the induction heater throat that aids the distribution of molten metal in the furnace.
    Type: Application
    Filed: December 20, 2002
    Publication date: June 5, 2003
    Inventor: Louis Johannes Fourie
  • Patent number: 6537342
    Abstract: Apparatus for a metal reduction and melting process, in which a metal and carbon-containing burden is heated in an induction furnace including a heating vessel in which the burden can float in at least one heap on a liquid metal bath in the vessel, is characterized in that the apparatus includes at least one induction heater or inductor located at the bottom center line of the vessel, with the longitudinal access oriented perpendicular to the access of the vessel.
    Type: Grant
    Filed: March 9, 2001
    Date of Patent: March 25, 2003
    Assignee: Ipcor NV
    Inventors: Louis Johannes Fourie, Johan Pierre Devilliers
  • Patent number: 6240120
    Abstract: Fine metallic particles are melted in a furnace having an upper region surrounded by a crucible coil and a lower region forming a channel holding a core of a channel inductor. The particles are filled from above into the vessel while simultaneously electrically energizing the inductor with alternating current to inductively heat and fuse the particles and thereby form a melt in the vessel and electrically energizing the coil with alternating current to mix the melt in the vessel while energizing the inductor.
    Type: Grant
    Filed: June 22, 2000
    Date of Patent: May 29, 2001
    Assignee: Induga Industrieofen und Giesserei-Anlagen GmbH & Co. KG
    Inventors: Hans Bebber, Juan Fähnrich, Günter Phillipps
  • Patent number: 6146437
    Abstract: The present invention provides a metal containing compound reduction and melting process which entails feeding a burden made of a mixture of the metal containing compound and a suitable reductant in particulate form into an electrically heatable vessel which contains a bath of the metal in liquid form so that a reaction zone is formed in the burden in which the metal containing compound is reduced and a melting zone is formed below the reaction zone in which the reduced metal is melted; and controlling the process in such a manner that substantially all of the reduction of the metal containing compound takes place in the solid phase.
    Type: Grant
    Filed: February 12, 1999
    Date of Patent: November 14, 2000
    Assignee: IPCOR NV
    Inventor: Louis J. Fourie
  • Patent number: 5953363
    Abstract: A channel furnace for the inductive heating of metal includes a molten metal holding hearth and a core and coil assembly surrounded by a channel of the furnace for inducing heating current in the metal in the channel. The channel is separated from the core and coil assembly by a refractory insulator and a bushing interposed between the refractory insulator and the core and coil assembly. The bushing is comprised of a wall portion having a plurality of slits or gaps disposed in the wall for minimizing eddy current formation therein and correspondingly reducing power loss therefrom. The bushing can be configured as either a coil type comprised of a plurality of slits disposed to extend circumferentially or a cage type, wherein the slits are disposed to extend longitudinally for segregating the wall into a plurality of wall sections. Both types can be made of water cooled flat metal tubes instead of plates with slits.
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: September 14, 1999
    Assignee: Ajax Magnethermic Corporation
    Inventor: Maochang Cao
  • Patent number: 5222097
    Abstract: A bushing cap used to close a gap in a liquid cooled bushing which surrounds a coil contained in a channel induction furnace. The coil, bushing and bushing cap is further surrounded by a thin refractory layer which is further surrounded by a molten metal loop. The bushing cap and bushing are liquid cooled to maintain a substantial uniform thermal gradient about the thin refractory layer surrounding the bushing and bushing cap. Preferably, this is accomplished by way of a bushing cap having a cooling member attached to a cover and mounted within the bushing gap. A cooling fluid is passed through both the cooling member of the bushing cap and cooling channels within the bushing to maintain a substantial uniform thermal gradient about the thin refractory layer.
    Type: Grant
    Filed: December 6, 1991
    Date of Patent: June 22, 1993
    Assignee: The Budd Company
    Inventors: William L. Powell, William J. Duca
  • Patent number: 5134629
    Abstract: A high frequency core and coil electric metal melting furnace is shown. This furnace has a lined channel in its inductor for carrying the molten metal. The invention provides an improved inductor for a core and coil furnace that is not subject to leakage of the molten metal from the channel into the rammed refractory support bed for the channel which leakage otherwise shortens the lift of the furnace. Also a method of lining the channel in the inductor for carrying the molten metal which forms the core is disclosed.
    Type: Grant
    Filed: February 8, 1990
    Date of Patent: July 28, 1992
    Assignee: Norton Company
    Inventor: Gerard M. Cullan
  • Patent number: 4611338
    Abstract: The invention relates to channel induction furnaces employed for melting metals.A channel is arranged to extend downwardly from a bath and to form a loop whereby molten metal in the bath can pass into the looped channel to form a closed electrically conducting loop. A laminated iron core passes through a coil and forms a closed magnetic circuit linked with the coil and channel. Consequently, alternating current applied to the coil induces currents to flow in the molten metal in the channel, which metal is therefore heated. The molten metal is contained in the channel within a refractory lined vessel. With application of the alternating current to the coil electromagnetic forces are produced which are directed away from the walls of a channel. Thus a squeezing action is applied to the metal which produces an increase in static pressure towards the center of the channel relative to that at the wall. This pressure fluctuates from zero to a maximum value at twice the frequency of the induced current.
    Type: Grant
    Filed: September 11, 1984
    Date of Patent: September 9, 1986
    Assignee: The Electricity Council
    Inventor: Douglas C. Lillicrap
  • Patent number: 4596020
    Abstract: A furnace for melting and melt-heat retaining of metals has two horizontal interspaced furnace vessels which form a melt chamber and each having a side wall facing the side wall of the other furnace vessel, each side wall having an opening horizontally aligned with the opening of the side wall of the other furnace vessel. A single inductor is positioned between these side walls and is formed by an integral block of ceramic having opposite ends abutting the outside of the side walls. The block has a transverse through-hole and two longitudinal through-holes straddling the transverse through-hole and open to the two furnace vessels so that they intercommunicate. The inductor has a core with an energizing coil and having a leg extending through the transverse hole. When the energizing coil is powered a melt in the two longitudinal through-holes is heated by an induced circuit which extends into and through melts in the two furnace vessels.
    Type: Grant
    Filed: October 12, 1983
    Date of Patent: June 17, 1986
    Assignee: Asea AB
    Inventor: Lars Halen
  • Patent number: 4589637
    Abstract: Solid scrap metal particles are ingested into molten metal by use of a linear induction motor which establishes a strong upstream in the molten metal adjacent one boundary wall to establish a standing wave at the surface and a corresponding downstream adjacent the opposite boundary, which is preferably in the form of a baffle having a metal outlet passage beneath it.The linear induction motor is conveniently positioned at a sidewell of a melting furnace and a continuous flow of molten metal through the sidewell is established in any convenient way.
    Type: Grant
    Filed: March 26, 1984
    Date of Patent: May 20, 1986
    Assignee: Alcan International Limited
    Inventors: Pervez J. F. Bamji, John F. Evans, Nigel P. Fitzpatrick
  • Patent number: 4559632
    Abstract: A channel-type induction furnace of the teapot type comprising a crucible having a bottom, a channel-type inductor in the bottom and having a partially semi-circular channel opening into said bottom, and straight inlet and outlet melt conduits respectively extending to and from the bottom and positioned substantially tangentially with respect to said channel so as to extend straight into and from the channel.
    Type: Grant
    Filed: June 26, 1984
    Date of Patent: December 17, 1985
    Assignee: Asea Aktiebolag
    Inventor: Kare Folgero
  • Patent number: 4532398
    Abstract: An induction coil, preferably for an induction heater, comprises a working coil, an outer casing and an inner lead-through channel for the workpieces, such as rods or tubes, which are to be treated in the induction coil. The region of the outer casing closest to the working coil consists of a layer of a rubber-elastic compound outside which is arranged a concrete casing. Using a two-part outer casing of this kind avoids the use of asbestos which is increasingly suspect because of its health hazard.
    Type: Grant
    Filed: December 1, 1982
    Date of Patent: July 30, 1985
    Assignee: ASEA Aktiebolag
    Inventor: Bengt Henriksson
  • Patent number: 4499583
    Abstract: A body of molten metal is simultaneously heated and rotated by the use of electromagnetic forces. In one embodiment, the melting of metals by induction heating is improved by using a circular spirally-wound electro-magnetic core located between a central flow channel and six peripherally-located flow channels. Three-phase electrical current is applied to the core windings to form a rotating magnetic field which intercepts the metal in the peripherally-located flow channels. The magnetic field causes heating of the metal in the peripheral channels with negligible heating in the central channel, thereby causing flow of heated metal through the peripheral channels to the bath. The magnetic field also causes rotational motion of the body of molten metal, thereby improving mixing and minimizing surface turbulence. In another embodiment, the electro-magnetic core is immersed in a body of molten metal to be surrounded thereby.
    Type: Grant
    Filed: January 3, 1983
    Date of Patent: February 12, 1985
    Assignee: J. Mulcahy Enterprises Incorporated
    Inventor: Joseph A. Mulcahy
  • Patent number: 4458353
    Abstract: The invention relates to a channel type induction furnace having at least one inductor and closed channels, including side channels, interconnected at the bottom, possibly via a bottom channel joining said channels, and possibly also a central channel extending between the hearth and the bottom channel, especially designed for aluminum, copper or other non-ferrous metals or non-ferrous alloys. The channel type induction furnace according to the invention is characterized in that the height of the channel in a plane through the longitudinal axis of the primary coil is at least, where .delta. is the depth of penetration into the melt of the current induced in the channel, and the width of the channel is at least
    Type: Grant
    Filed: October 18, 1982
    Date of Patent: July 3, 1984
    Assignee: ASEA Aktiebolag
    Inventor: Tallback Gote
  • Patent number: 4441191
    Abstract: A horizontally elongated furnace to contain a molten metal flow having one end provided with an inlet and the other with an outlet for the flow. An AC powered channel-type inductor is connected to the furnace side wall at an opening below the level of the metal flow. The inductor may be removably mounted to the furnace.
    Type: Grant
    Filed: October 14, 1981
    Date of Patent: April 3, 1984
    Assignee: Asea AB
    Inventors: Bengt Fredrikson, Bertil Hans
  • Patent number: 4435820
    Abstract: A channel induction furnace, particularly for melting aluminum has a pair of U-shaped channels extending downwardly from the bath. The channels have a radial width, measured outwardly from the axis of the core, which is several times the penetration depth in the molten metal for a current of the energizing frequency and the channel section is tapered so that the channel is wider near the core and narrower away from the core. The planes containing the axes of the channels are skewed about an axis of skewing normal to the axis of the core.
    Type: Grant
    Filed: September 21, 1981
    Date of Patent: March 6, 1984
    Assignee: The Electricity Council
    Inventor: Christopher J. Edgerley