Industrial electric heating furnaces – Induction furnace device – Coreless
Patent
1981-01-29
1982-05-25
Envall, Jr., Roy N.
Industrial electric heating furnaces
Induction furnace device
Coreless
373128, 373158, H05B 500
Patent
active
043318282
ABSTRACT:
A rotatable mounting for the crucible of an electric induction furnace is disclosed. The mounting apparatus includes an access cylinder rotatably mounted within a tubular flange on one wall of the furnace enclosure. Positive and negative slip ring assemblies are mounted at the front of the access cylinder together with a hose reel assembly. The slip ring assemblies each comprise a rotor which is secured to the access cylinder and a stator which is attached to the wall of the enclosure. Flexible electric power leads are attached to terminal blocks at the bottom of each stator and provide both water and electricity to the furnace. Flexible hoses leading from the terminal blocks to the hose reel assembly provide water to the electric heating elements, which are colis made of metal tubing. Electricity is conducted through the slip ring assemblies to power leads which are mounted in the positive and negative rotors. The hose reel has insulated connections to each of the power leads to provide cooling water to the heating elements. The heating elements each have one end connected to a positive power lead and the other end connected to the negative power lead. In this way, both water and electricity are supplied to each of the heating elements. Furthermore, since the various conducting elements of the system remain spatially fixed relative to one another, the total system inductance remains unchanged while the crucible mount is rotated. Precise temperature control of the furnace is thereby facilitated.
REFERENCES:
patent: 2675414 (1954-04-01), Capita
patent: 2890258 (1959-06-01), Krall et al.
Envall Jr. Roy N.
Retech, Inc.
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