Abstract: A gas purge device for a metallurgical melting vessel includes a conically shaped ceramic body (2) in contact at its top side with heat contained in the melting vessel. The ceramic body has a static external element and an internal element axially movable therein. A pneumatic drive axially moves the internal element to and fro relative to the external element between a closed position and an open position. The spring force of a spring retains the internal element in the closed position. The device furthermore includes a gas-tight enclosed volume arranged at the bottom side of the ceramic body the volume being connected to a gas supply duct for introduction of purge gas. A deformable membrane is connected to the internal element with the pressure difference between the purge gas pressure prevailing in the gas-tight enclosed volume and the ambient pressure acting upon the membrane.

Abstract: The invention relates to a gas purge device for a metallurgical melting vessel, (1), comprising a conically shaped ceramic body (2) getting at its top side (3) in contact with a heat (4) contained in the melting vessel (1), said ceramic body (2) having a static external element (5) and an internal element (6) axially movable therein, further comprising a pneumatic drive (15) by means of which the internal element (6) can be axially moved to and fro relatively to the external element (5) of the ceramic body (5) between a closed position and an open position, with a spring (18) being provided, by the spring force of which the internal element (6) is retained in the closed position, and furthermore comprising a gas-tight enclosed volume (9) arranged at the bottom side (7) of the ceramic body (2), said volume being connected to a gas supply duct for introduction of purge gas.