Patent ID: 7645418
Filing Date: 2010-01-12
Classification: B22D,Y10T

Abstract:
1. A gas purge device for a metallurgical melting vessel, comprising a conically shaped ceramic body getting at its top side in contact with a heat contained in the melting vessel, said ceramic body having a static external element and an internal element axially movable therein, further comprising a pneumatic drive by means of which the internal element can be axially moved to and fro relatively to the external element of the ceramic body between a closed position and an open position, with a spring being provided, by the spring force of which the internal element is retained in the closed position, and furthermore comprising a gas-tight enclosed volume arranged at the bottom side of the ceramic body, said volume being connected to a gas supply duct for introduction of purge gas, wherein the pneumatic drive comprises a deformable membrane connected through a connecting rod to the internal element, the connecting rod also connecting the internal element with the spring, with the pressure difference between the purge gas pressure prevailing in the gas-tight enclosed volume and the ambient pressure acting upon said membrane; wherein the connecting rod is shaped like a pipe that serves as gas supply duct to introduce the purge gas into the gas-tight enclosed volume.