초록 ▼

A pour tube for use in the continuous casting of a stream of molten metal has a bore comprising a plurality of fluidly connected sections that improve the flow of molten metal through the bore. The sections reduce asymmetric flow of the molten metal stream and the likelihood of precipitates clogging

A pour tube for use in the continuous casting of a stream of molten metal has a bore comprising a plurality of fluidly connected sections that improve the flow of molten metal through the bore. The sections reduce asymmetric flow of the molten metal stream and the likelihood of precipitates clogging the bore. Each section comprises a converging portion and a diverging portion. The converging portion deflects the stream toward the center of the bore, while the diverging portion diffuses the stream. The sections may comprise a plurality of frusto-conical sections. The cross-sectional areas of the sections may increase, decrease, or remain the same size from an upstream to a downstream position.

대표청구항 ▼

1. A pour tube for reducing alumina clogging in continuous casting of a stream of molten metal from an upstream position to a downstream position along a longitudinal center axis, the pour tube comprising an inner surface defining a throughflow bore between the upstream and downstream positions, the

1. A pour tube for reducing alumina clogging in continuous casting of a stream of molten metal from an upstream position to a downstream position along a longitudinal center axis, the pour tube comprising an inner surface defining a throughflow bore between the upstream and downstream positions, the bore comprising a plurality of fluidly connected sections, where each section comprises:an inlet having an inlet cross-sectional area perpendicular to the center axis; a sharply converging step downstream of the inlet for directing the stream towards the center axis; a constriction downstream of the converging step having a constriction cross-sectional area perpendicular to the center axis; a slowly diverging portion downstream of the constriction for diffusing the stream, whereby turbulence is generated along the inner surface and alumina clogging is reduced; and an outlet downstream of the diverging portion having an outlet width and an outlet cross-sectional area perpendicular to the center axis.