Stopper for use in molten metal handling

Details Stopper for use in molten metal handling Stopper for use in molten metal handling

F - Mech Eng,Light,Heat,Weapons

27

D

39/113

F27D 3/14 (2006.01) B22D 35/04 (2006.01) B22D 41/10 (1985.01)

Patent

CA 1261621

ABSTRACT STOPPER FOR USE IN MOLTEN METAL HANDLING A stopper comprises a monoblock refractory body (1) having a gas duct (2) venting through a nozzle (11) or porous region (12) in the nose (3) of the stopper and being sealed at its upper end apart from a gas supply port (5) opening from a gas supply channel (6) extending through the body (1) to a gas supply inlet (7) adjacent the top of the stopper, the said conduit (6) optionally including restrictor means (16) to ensure a positive gas supply to the stopper in order to overcome gas leaks and air ingress due to a tendency for a vacuum to form in gas-ducted stoppers in use due to the venturi effect of melt rushing past the stopper nose (3) through a sub-entry nozzle in casting operations.

498542

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